/* 相长｜许老师的 AI 教学实验室 —— 全站样式（v6 品牌，版式标准答案见 docs/样张-v5/index.html 与 说明.md）
   配色 A「沉稳群青」（2026-10-20 站主选定，原 #2B3BFF + 柠檬黄太顶眼）：
   主色群青 #3446C4（按钮、强调字、链接、进度字标）· 奶黄 #F6E7B0（只用在小面积：「最新」「当前」、「在想」卡）
   墨 #1A1F33 · 暖白 #FAFAF7 · 浅蓝灰底 #EEF0F8 · 卡片底 #F3F4F8 · 升温 白 → #E8EAF6 → #D9DDF1 → 奶黄。不再大面积铺满蓝。
   字体：系统粗黑体栈（苹方最重只有 Semibold，大标题用同色描边补分量）；数字与字标 x/z 用 Avenir Next。
   背景字「从未知到未来」：志莽行书 5 字子集（SIL OFL，许可见 /assets/fonts/OFL-zhimangxing.txt）。
   只有浅色主题。产品页（.product）用各自皮肤，只共用细栏与页脚的字标和字体。 */

@font-face {
  font-family: "XZ Ghost";
  src: url("/assets/fonts/zhimangxing-bg.woff2?v=3b8cd24feb") format("woff2");
  font-display: block;
}

:root {
  --blue: #3446C4;
  --blue-hi: #3D50D2;
  --blue-ink: #2C3BA8;
  --tint: #EEF0F8;
  --tint-2: #E8EAF6;
  --tint-3: #D9DDF1;
  --tint-4: #CFD4EE;
  --card: #F3F4F8;
  --boil: #F6E7B0;
  --ink: #1A1F33;
  --ink-2: #4A4F66;
  --ink-3: #8E92A6;
  --paper: #FAFAF7;
  --hair: rgba(26, 31, 51, .12);
  --cn: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --lat: "Avenir Next", "Helvetica Neue", Arial;
  --font: var(--lat), var(--cn);
  --wrap: 1280px;
  --gut: clamp(16px, 4.4vw, 64px);
  --ease: cubic-bezier(.2, .7, .1, 1);
  /* 通用组件（表单、问答、截图组……）用的变量；产品皮肤会覆盖它们 */
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --field: #FFFFFF;
  --text: #1A1F33;
  --muted: #4A4F66;
  --line: #E1E2E8;
  --line-strong: #B9BBC9;
  --accent: #3446C4;
  --on-accent: #FFFFFF;
  --err: #C3261B;
  --gp: 0;
  --ghost: rgba(26, 31, 51, .05);
  color-scheme: light;
}

/* ------------------------------------------------------------ 基础 */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
html, body { margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font: 16px/1.7 var(--font); -webkit-font-smoothing: antialiased; overflow-x: hidden; overflow-wrap: break-word; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
svg { max-width: 100%; }
h1, h2, h3, h4, p { margin: 0; }
p { text-wrap: pretty; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
main:focus { outline: none; }
strong, b { font-weight: 600; }
.num { font-family: var(--lat); font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.muted { color: var(--muted); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 12px; top: -48px; z-index: 90; background: var(--boil); color: var(--ink); padding: 8px 14px; border-radius: 999px; font-weight: 600; }
.skip-link:focus { top: 12px; }

.wrap, .container { width: 100%; max-width: calc(var(--wrap) + var(--gut) * 2); margin: 0 auto; padding: 0 var(--gut); }
.wrap.read { max-width: calc(760px + var(--gut) * 2); }
/* 粗黑体：苹方最重只到 Semibold，用同色描边补到 800 级的分量 */
.display { font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .022em currentColor; letter-spacing: -.025em; line-height: 1.08; }
.display em { font-style: normal; color: var(--blue); }
.kicker { font-size: 13px; font-weight: 600; letter-spacing: .14em; color: var(--ink-2); display: flex; align-items: center; gap: 10px; }
.kicker::before { content: ""; flex: none; width: 22px; height: 2px; background: currentColor; opacity: .5; }

/* ------------------------------------------------------------ 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 54px; padding: 0 26px; border: 0; border-radius: 999px; cursor: pointer;
  font: 600 17px/1 var(--font); letter-spacing: .02em; white-space: nowrap; background: transparent; color: var(--ink);
  transition: transform .3s var(--ease), background-color .3s, color .3s, box-shadow .3s; }
.btn:active { transform: scale(.97); }
.btn .ar { display: inline-block; transition: transform .3s var(--ease); }
.btn:hover .ar { transform: translateX(4px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 8px 22px -12px rgba(52, 70, 196, .55); }
.btn-primary:hover { background: var(--blue-hi); }
.btn-ghost { color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-down:hover .ar { transform: translateY(3px); }
.btn-line { color: var(--blue); box-shadow: inset 0 0 0 1.5px var(--blue); }
.btn-line:hover { background: var(--blue); color: #fff; }
.btn-small { height: 36px; padding: 0 14px; font-size: 14px; }
.btn-big { height: 60px; padding: 0 30px; font-size: 18px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; box-shadow: none; }
.pill { display: inline-block; font-size: 12px; line-height: 1.6; padding: 1px 10px; border-radius: 999px; background: var(--tint); color: var(--blue-ink); white-space: nowrap; }
.chip { display: inline-flex; align-items: center; height: 28px; padding: 0 11px; border-radius: 999px; font-size: 13px; font-weight: 600; white-space: nowrap; }

/* ------------------------------------------------------------ 页头：x → z 字标兼阅读进度 */
.top { position: fixed; inset: 0 0 auto 0; z-index: 50; height: 64px; color: var(--ink); transition: color .4s; }
.top::before { content: ""; position: absolute; inset: 0; background: rgba(251, 251, 248, .82);
  -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--hair); transition: background-color .4s, border-color .4s; }
.top .wrap { position: relative; height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.mark { --p: 1; display: flex; align-items: center; gap: 7px; font-family: var(--lat); font-weight: 700; font-size: 23px; line-height: 1; letter-spacing: -.02em; }
.mark .x, .mark .z { display: block; transform: translateY(-2px); }
.mark .track { position: relative; width: 46px; height: 2px; }
.mark .track::before { content: ""; position: absolute; inset: 0; background: currentColor; opacity: .22; }
.mark .fill { position: absolute; inset: 0; background: var(--blue); transform-origin: 0 50%; transform: scaleX(var(--p)); }
.mark .head { position: absolute; left: 0; top: 50%; width: 8px; height: 8px; margin: -4px 0 0 -6px;
  border-top: 2px solid var(--blue); border-right: 2px solid var(--blue); transform: translateX(calc(var(--p) * 46px)) rotate(45deg); }
.brand .name { font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor; font-size: 19px; letter-spacing: .06em; white-space: nowrap; }
.brand .sub { font-size: 13px; opacity: .62; letter-spacing: .04em; padding-left: 14px; white-space: nowrap;
  border-left: 1px solid color-mix(in srgb, currentColor 30%, transparent); }
.nav { display: flex; align-items: center; gap: 30px; font-size: 15px; font-weight: 500; }
.nav a.l { position: relative; opacity: .78; transition: opacity .2s; white-space: nowrap; }
.nav a.l:hover, .nav a.l[aria-current="page"] { opacity: 1; }
.nav a.l[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; border-radius: 2px; background: var(--blue); }
.nav .btn { height: 38px; padding: 0 18px; font-size: 14px; }

/* 窄屏菜单（<details>）：宽屏隐藏；展开后是页头下方的全屏暖白面板，粗黑体大字 */
.menu { display: none; }
.menu-btn { height: 38px; padding: 0 16px; font-size: 14px; list-style: none; cursor: pointer; user-select: none; }
.menu-btn::-webkit-details-marker { display: none; }
.menu[open] .menu-btn { background: var(--ink); color: #fff; box-shadow: none; }
.menu-panel { position: fixed; left: 0; right: 0; top: 64px; bottom: 0; z-index: 60; overflow-y: auto; overscroll-behavior: contain;
  background: var(--paper); color: var(--ink); border-top: 1px solid var(--hair); padding: 12px var(--gut) 40px; }
.menu-panel::before { content: ""; position: absolute; left: 0; top: 0; height: 5px; width: 100%; background: var(--blue); }
.menu-nav { display: flex; flex-direction: column; }
.menu-nav a { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--hair);
  font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor; font-size: clamp(28px, 8vw, 40px); line-height: 1.2; letter-spacing: -.01em; }
.menu-nav a .ar { font-family: var(--lat); font-size: 22px; -webkit-text-stroke: 0; color: var(--ink-3); }
.menu-nav a:hover, .menu-nav a:focus-visible { color: var(--blue); }
.menu-nav a[aria-current="page"] { color: var(--blue); }
.menu-here { flex: none; font-family: var(--font); font-size: 13px; font-weight: 700; -webkit-text-stroke: 0; letter-spacing: .04em; color: var(--ink); background: var(--boil); border-radius: 999px; padding: 2px 10px; }
.menu-nav a:last-child { border-bottom: 0; margin-top: 18px; justify-content: center; height: 60px; padding: 0; border-radius: 999px; background: var(--blue); color: #fff; font-size: 20px; }
.menu-nav a:last-child .ar { color: #fff; }
.menu-nav a:last-child[aria-current="page"] .menu-here { margin-left: 4px; }
html.menu-open, html.menu-open body { overflow: hidden; }

/* 内页：页头固定，正文让出 64px */
body:not(.layout-home):not(.product) main { padding-top: 64px; }

/* ------------------------------------------------------------ 固定背景字：从未知到未来 */
.ghost, .slab-ghost, .page-ghost { pointer-events: none; user-select: none; }
.ghost { position: absolute; inset: 0; z-index: 0; clip-path: inset(0); color: var(--ghost); }
.gw { position: fixed; inset: 0; font-family: "XZ Ghost", serif; font-size: 31vh; line-height: 1; white-space: nowrap;
  transform: translateY(calc(var(--gp) * -3vh)) scale(calc(1 + var(--gp) * .04)); transform-origin: 50% 50%; }
.gw span { position: absolute; display: block; }
.gw .l1 { top: 11vh; left: -1.5vw; opacity: calc(1 - var(--gp) * .6); }
.gw .l2 { right: -2.5vw; bottom: -5vh; opacity: calc(.4 + var(--gp) * .6); }
.still .gw { transform: none; }
.still .gw .l1, .still .gw .l2 { opacity: .8; }
/* 内页：更淡、静止，钉在视口后面，不干扰阅读 */
.page-ghost { position: fixed; inset: 0; z-index: 0; color: rgba(26, 31, 51, .03); }
.page-ghost .gw { transform: none; }
.page-ghost .gw .l1, .page-ghost .gw .l2 { opacity: 1; }
.layout-note .page-ghost { color: rgba(26, 31, 51, .022); }
body > main, body > .foot { position: relative; z-index: 1; }

/* ------------------------------------------------------------ 首屏 */
.hero, .four, .grow, .end, .foot { isolation: isolate; }
.hero { position: relative; min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; overflow: hidden; padding-top: 64px; }
.hero > .wrap { position: relative; z-index: 1; flex: 1; display: grid; grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr); align-items: center; }
.hero-copy { position: relative; z-index: 3; padding: 40px 0 72px; }
.eyebrow { display: flex; align-items: center; gap: 12px; font-size: 15px; font-weight: 600; letter-spacing: .08em; color: var(--ink-2); margin-bottom: 30px; }
.eyebrow .spark { width: 10px; height: 10px; border-radius: 50%; background: #E9CF72; box-shadow: 0 0 0 4px rgba(246, 231, 176, .7); }
.hero-title { font-size: clamp(40px, 6.4vw, 96px); color: var(--ink); }
.hero-title .ln { display: block; overflow: hidden; padding: .02em 0 .1em; margin-bottom: -.1em; }
.hero-title .ln > span { display: inline-block; }
.lede { margin-top: 30px; max-width: 30em; font-size: clamp(16px, 1.35vw, 20px); line-height: 1.8; color: var(--ink-2); }
.lede b { color: var(--ink); font-weight: 600; }
.cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero-art { position: absolute; z-index: 1; right: 0; bottom: 0; top: 64px; width: 45vw; max-width: 780px; }
/* 肖像后的色块：配色 A 用浅群青 #D9DDF1，深色西装落在上面更自然，不再是一整块饱和蓝 */
.slab { position: absolute; left: 0; right: 0; bottom: 0; height: 58%; background: var(--tint-3); transform-origin: 50% 100%; }
.slab::after { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 10px; opacity: .35;
  background-image: linear-gradient(to right, var(--blue) 1px, transparent 1px); background-size: 28px 10px; background-repeat: repeat-x; }
.slab-ghost { position: absolute; left: 0; right: 0; bottom: 0; height: 58%; z-index: 1; clip-path: inset(0); color: rgba(52, 70, 196, .06); }
.portrait { position: absolute; bottom: 0; right: 5%; height: min(82%, 780px); width: auto; max-width: none; z-index: 2;
  filter: drop-shadow(0 24px 40px rgba(26, 31, 51, .16)); }
.scroll-cue { position: absolute; z-index: 3; left: var(--gut); bottom: 0; width: 24px; height: 64px; display: block; }
.scroll-cue i { position: absolute; left: 11px; top: 0; width: 1.5px; height: 100%; background: var(--hair); overflow: hidden; }
.scroll-cue i::after { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 40%; background: var(--blue); animation: cue 2.2s var(--ease) infinite; }
@keyframes cue { 0% { transform: translateY(-100%); } 70%, 100% { transform: translateY(260%); } }

/* ------------------------------------------------------------ 我在做的事：一张比一张热 */
.four { --heat: 1; position: relative; padding: 120px 0; background: color-mix(in srgb, var(--tint) calc(var(--heat) * 55%), var(--paper)); }
.four .ghost { color: rgba(52, 70, 196, .06); }
.four > .wrap, .grow > .wrap, .end > .wrap { position: relative; z-index: 1; }
.sec-head { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 40px; align-items: end; margin-bottom: 52px; }
.sec-head h2 { font-size: clamp(34px, 4.6vw, 64px); margin-top: 18px; }
.sec-head > p { font-size: 17px; color: var(--ink-2); max-width: 26em; justify-self: end; }
.cards { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 14px; list-style: none; margin: 0; padding: 0; }
.cards > .card { grid-column: span 2; }
.cards > .card.wide { grid-column: span 3; min-height: 0; }
.card { position: relative; display: flex; flex-direction: column; min-height: 540px; border-radius: 6px; overflow: hidden;
  transition: background-color 1.1s var(--ease), color 1.1s var(--ease), box-shadow 1.1s var(--ease), transform .5s var(--ease); }
.card:hover { transform: translateY(-4px); }
.card-a { flex: 1; display: flex; flex-direction: column; padding: 26px 26px 24px; }
.card .gauge { position: absolute; left: 0; top: 0; height: 5px; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--lvl)); transition: transform 1.4s var(--ease) .15s; }
.card .idx { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: 14px; font-weight: 600; letter-spacing: .06em; }
.card .idx .n { font-family: var(--lat); font-weight: 700; }
.card .idx .step { opacity: .6; font-weight: 500; text-align: right; }
.card .metric { margin-top: 30px; display: flex; flex-wrap: wrap; align-items: flex-end; align-content: flex-end; gap: 8px; row-gap: 8px; min-height: 138px; }
.card .metric .brk { flex-basis: 100%; }
.card .metric .cnu { font-family: var(--cn); font-size: clamp(36px, 3vw, 44px); line-height: 1; font-weight: 900; -webkit-text-stroke: .02em currentColor; padding-bottom: .08em; }
.card .metric.words { flex-direction: column; flex-wrap: nowrap; align-items: flex-start; align-content: flex-start; justify-content: flex-end; gap: 0; }
.card .metric.words span { font-family: var(--cn); font-size: clamp(36px, 3.1vw, 44px); line-height: 1.08; font-weight: 900; -webkit-text-stroke: .022em currentColor; letter-spacing: .02em; }
.card .metric .num { font-size: clamp(64px, 6vw, 88px); line-height: .9; letter-spacing: -.03em; }
.card .metric .u { font-size: 17px; font-weight: 600; white-space: nowrap; }
.card h3 { font-family: var(--cn); margin-top: 22px; font-size: 28px; line-height: 1.2; font-weight: 900; -webkit-text-stroke: .02em currentColor; letter-spacing: -.01em; }
.card .say { margin-top: 12px; font-size: 15.5px; line-height: 1.75; }
.card .proof { margin-top: auto; padding-top: 22px; font-size: 13.5px; line-height: 1.6; }
.card .row { display: flex; flex-wrap: wrap; gap: 6px; }
.card .works { margin-top: 14px; align-items: center; }
.card .works .wl { font-size: 12px; opacity: .6; margin-right: 4px; }
.card .go { display: flex; justify-content: space-between; align-items: center; margin-top: 18px; padding-top: 16px; font-size: 15px; font-weight: 600;
  border-top: 1px solid color-mix(in srgb, currentColor 18%, transparent); }
.card .go .ar { transition: transform .3s var(--ease); }
.card:hover .go .ar { transform: translateX(5px); }
.card .split { flex: 1; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 34px; align-items: center; margin-top: 20px; }
.card .split .metric { margin-top: 0; min-height: 0; }
.card .split h3 { margin-top: 0; }
.card .apps { display: flex; gap: 10px; margin-top: 14px; }
.card .apps figure { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; }
.card .apps img { width: 44px; height: 44px; border-radius: 11px; box-shadow: 0 4px 12px rgba(0, 0, 0, .18); transition: filter 1s, opacity 1s; }
.minis { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; gap: 4px 18px; margin-top: 2px; }
.minis div b { display: block; font-size: 22px; line-height: 1.1; font-weight: 700; letter-spacing: -.02em; }
.minis div span { font-size: 12px; opacity: .75; }
/* 五档温度（点亮后的终态） */
.c1 { --lvl: .2; background: #fff; color: var(--ink); box-shadow: inset 0 0 0 1px var(--hair); }
.c1 .gauge { background: var(--blue); } .c1 .metric { color: var(--blue); } .c1 .say { color: var(--ink-2); }
.c1 .chip { background: var(--tint); color: var(--blue-ink); }
.c2 { --lvl: .4; background: var(--tint-2); color: var(--ink); }
.c2 .gauge { background: var(--blue); } .c2 .metric { color: var(--blue); } .c2 .say { color: var(--ink-2); }
.c2 .chip { background: #fff; color: var(--blue-ink); }
.c3 { --lvl: .6; background: var(--tint-3); color: var(--ink); }
.c3 .gauge { background: var(--blue); } .c3 .metric { color: var(--blue-ink); } .c3 .say { color: var(--ink-2); }
.c3 .chip { background: #fff; color: var(--blue-ink); }
.c4 { --lvl: .8; background: var(--tint-4); color: var(--ink); }
.c4 .gauge { background: var(--blue); } .c4 .metric { color: var(--blue-ink); } .c4 .say { color: var(--ink-2); }
.c4 .chip { background: #fff; color: var(--blue-ink); }
.c5 { --lvl: 1; background: var(--boil); color: var(--ink); }
.c5 .gauge { background: var(--blue); } .c5 .metric { color: var(--blue-ink); } .c5 .say { color: #4A4530; }
.c5 .chip { background: rgba(26, 31, 51, .08); color: var(--ink); }
.c5 .more { display: block; margin-top: 10px; font-size: 13.5px; line-height: 1.65; font-weight: 500; color: #4A4530; }

/* ------------------------------------------------------------ 关联网（首页「正在生长」、内容页「关联」、主题页）
   浅蓝灰底 #EEF0F8 + 墨色字，弧线与强调用主色；「最新」「当前」用奶黄小徽标。 */
.grow { position: relative; background: var(--tint); color: var(--ink); padding: 120px 0; }
.layout-home .grow { padding-bottom: 96px; }
.grow .ghost, .end .ghost { color: rgba(52, 70, 196, .06); }
.rel .ghost, .line-web .ghost { color: rgba(52, 70, 196, .05); }
.rel .gw, .line-web .gw { transform: none; }
.rel .gw .l1, .rel .gw .l2, .line-web .gw .l1, .line-web .gw .l2 { opacity: 1; }
.grow-in { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 56px; }
.grow-side { position: sticky; top: 110px; align-self: start; }
.grow-side h2 { font-size: clamp(34px, 3.6vw, 54px); margin-top: 18px; color: var(--ink); }
.grow-side > p { margin-top: 20px; color: var(--ink-2); font-size: 16px; max-width: 24em; }
.legend { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.legend button, .legend a { font: inherit; font-size: 14px; font-weight: 600; color: var(--ink); background: #fff; border: 0; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--hair);
  height: 36px; padding: 0 14px; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; transition: background-color .25s, color .25s, box-shadow .25s; }
.legend button:hover, .legend a:hover { color: var(--blue); box-shadow: inset 0 0 0 1px var(--blue); }
.legend button[aria-pressed="true"], .legend a[aria-current="page"] { background: var(--blue); color: #fff; box-shadow: none; }
.legend .c { font-family: var(--lat); font-size: 12px; opacity: .7; }
.legend-links a::after { content: "→"; font-size: 13px; opacity: .6; }
.legend-hint { margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.legend-title { margin-top: 28px !important; font-size: 13px !important; letter-spacing: .1em; color: var(--ink-2) !important; }
.legend-title + .legend { margin-top: 10px; }
.web { position: relative; padding: 0 0 0 var(--gw); --gw: 120px; }
.nodes { list-style: none; margin: 0; padding: 0; }
.arcs { position: absolute; left: 0; top: 0; width: var(--gw); height: 100%; overflow: visible; pointer-events: none; }
.arcs path { fill: none; stroke: var(--blue); stroke-width: 1.4; stroke-linecap: round; opacity: 0; transition: opacity .8s var(--ease), stroke-width .3s; }
.arcs.shown path { opacity: .3; }
.arcs.shown path.back { opacity: .75; }
.arcs.shown path.hot { opacity: 1; stroke-width: 2.2; }
.arcs.shown path.dim { opacity: .07; }
.node { position: relative; padding: 22px 0 24px; border-top: 1px solid var(--hair); transition: opacity .4s; }
.node:last-child { border-bottom: 1px solid var(--hair); }
.node .dot { position: absolute; left: -6px; top: 31px; width: 12px; height: 12px; border-radius: 50%; background: var(--tint); box-shadow: inset 0 0 0 2px var(--blue); transform: translateX(-10px); }
.node.hot .dot { background: var(--blue); }
.node.dim { opacity: .32; }
.node .meta { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: center; font-size: 13px; color: var(--ink-2); letter-spacing: .04em; }
.node .meta time { font-family: var(--lat); font-weight: 600; }
.node .meta .new, .node .meta .here-tag { display: inline-flex; align-items: center; gap: 6px; color: var(--ink); background: var(--boil); border-radius: 999px; padding: 1px 9px; font-weight: 700; font-size: 12px; }
.node .meta .why { color: var(--ink-2); border-radius: 999px; padding: 0 9px; font-size: 12px; font-weight: 600; box-shadow: inset 0 0 0 1px var(--hair); background: #fff; }
.node.why-back .meta .why { color: var(--blue-ink); box-shadow: inset 0 0 0 1px var(--blue); }
.node .t { display: block; margin-top: 6px; font-size: clamp(19px, 1.7vw, 24px); line-height: 1.4; font-weight: 700; color: var(--ink); transition: color .25s; }
.node a.t:hover { color: var(--blue); }
.node .s { margin-top: 6px; color: var(--ink-2); font-size: 15px; line-height: 1.7; max-width: 40em; }
.node .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.node .tags span { font-size: 12.5px; font-weight: 600; padding: 2px 10px; border-radius: 999px; background: #fff; color: var(--ink-2); transition: background-color .25s, color .25s; }
.node .tags span.on { background: var(--blue); color: #fff; }
.node.seed { padding: 16px 0 18px; }
.node.seed .dot { top: 24px; background: transparent; box-shadow: inset 0 0 0 2px var(--blue); }
.node.seed .dot::after { content: ""; position: absolute; inset: -6px; border-radius: 50%; border: 1.5px solid var(--blue); opacity: .6; animation: ping 2.4s var(--ease) infinite; }
.node.seed .t { color: var(--ink-2); font-weight: 500; font-size: 16px; }
@keyframes ping { 0% { transform: scale(.5); opacity: .6; } 80%, 100% { transform: scale(1.8); opacity: 0; } }
/* 关联区：「这一页」是实心主色点 */
.node.here .dot { background: var(--blue); box-shadow: 0 0 0 5px rgba(52, 70, 196, .15); }
.node.here .t { font-size: clamp(21px, 2vw, 28px); }
.play { display: inline-flex; width: 18px; height: 18px; border-radius: 50%; background: var(--blue); align-items: center; justify-content: center; margin-right: 4px; vertical-align: -4px; }
.play::after { content: ""; border-left: 6px solid #fff; border-top: 4px solid transparent; border-bottom: 4px solid transparent; margin-left: 2px; }
.web-all { margin-top: 26px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; font-size: 13.5px; color: var(--ink-2); }
.web-all a { color: var(--blue-ink); font-weight: 600; border-bottom: 1px solid rgba(52, 70, 196, .3); }
.web-all a:hover { border-color: var(--blue); }
.web-all .c { font-family: var(--lat); font-weight: 500; opacity: .7; }

/* ------------------------------------------------------------ 首页收尾 */
.end { position: relative; background: var(--paper); color: var(--ink); padding: 96px 0 0; overflow: hidden; }
.end .pair { font-size: clamp(18px, 1.6vw, 22px); font-weight: 600; display: flex; align-items: center; gap: 14px; color: var(--ink-2); }
.end .pair .arrow { position: relative; display: block; width: clamp(60px, 10vw, 140px); height: 2px; background: var(--hair); }
.end .pair .arrow::after { content: ""; position: absolute; right: 0; top: 50%; width: 9px; height: 9px; margin-top: -5px; border-top: 2px solid var(--blue); border-right: 2px solid var(--blue); transform: rotate(45deg); }
.end .pair .arrow i { position: absolute; inset: 0; background: var(--blue); transform-origin: 0 50%; }
.end .pair b { font-family: var(--lat); font-weight: 700; font-size: 1.32em; line-height: 1; transform: translateY(-.08em); display: inline-block; color: var(--ink); }
.end .pair .w { display: inline-flex; align-items: baseline; gap: .32em; }
.end h2 { margin-top: 26px; font-size: clamp(52px, 10vw, 156px); line-height: 1.02; color: var(--ink); }
.end h2 .ln { display: block; }
.end-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: end; margin-top: 44px; padding-bottom: 96px; }
.end-row p { font-size: clamp(16px, 1.4vw, 19px); line-height: 1.8; color: var(--ink-2); max-width: 30em; }
.end .btn { height: 64px; padding: 0 34px; font-size: 19px; }

/* ------------------------------------------------------------ 页脚 */
.foot { position: relative; background: var(--card); color: var(--ink-2); font-size: 14px; line-height: 1.7; border-top: 1px solid var(--hair); }
.foot a { color: var(--ink); }
.foot-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 18px 40px; padding-top: 34px; padding-bottom: 26px; }
.foot-brand { display: inline-flex; align-items: center; gap: 14px; font-weight: 600; }
.foot .mark { font-size: 18px; }
.foot-nav, .foot-links { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.foot-nav a { font-weight: 600; }
.foot-nav a:hover, .foot-links a:hover { color: var(--blue); }
.foot-bottom { position: relative; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px 32px; padding-top: 18px; padding-bottom: 30px;
  font-size: 13px; color: var(--ink-2); }
.foot-bottom::before { content: ""; position: absolute; top: 0; left: var(--gut); right: var(--gut); border-top: 1px solid var(--hair); }
.foot-links a { color: var(--ink-2); }
main > :last-child:not(.grow) { margin-bottom: 0; }

/* ------------------------------------------------------------ 内页页头 */
.page-head { position: relative; padding: clamp(56px, 8vw, 112px) 0 clamp(40px, 5vw, 64px); }
.page-head-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 32px 64px; align-items: end; }
.page-head.has-aside .page-head-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 340px); }
.page-head h1 { text-wrap: balance; margin-top: 22px; font-size: clamp(42px, 6.2vw, 92px); color: var(--ink); }
.page-head .kicker a:hover { color: var(--blue); }
.subtitle { margin-top: 26px; max-width: 32em; font-size: clamp(17px, 1.5vw, 21px); line-height: 1.8; color: var(--ink-2); }
.subtitle b { color: var(--ink); }
.page-aside { margin: 0; padding: 16px 0 0; border-top: 3px solid var(--blue); font-size: 15px; line-height: 1.75; color: var(--ink); }
.page-aside a { font-weight: 600; color: var(--blue); }
.layout-page .page-head, .layout-notfound .page-head, .layout-topic .page-head:not(.has-aside) { padding-bottom: 12px; }
.layout-page .sec-intro, .layout-notfound .sec-intro, .layout-topic .page-head:not(.has-aside) + .sec-intro { padding-top: 12px; }

/* 页首温度卡：和首页五张卡同一套温度 */
.hcard { position: relative; overflow: hidden; display: flex; flex-direction: column; gap: 18px; padding: 24px 24px 22px; border-radius: 6px; min-height: 250px; }
.hcard .gauge { position: absolute; left: 0; top: 0; height: 5px; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--lvl)); }
.hcard .idx { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: 13.5px; font-weight: 600; letter-spacing: .06em; }
.hcard .idx .step { opacity: .6; font-weight: 500; text-align: right; }
.hcard .metric { margin-top: auto; display: flex; flex-wrap: wrap; align-items: flex-end; gap: 6px 8px; }
.hcard .metric .num { font-size: clamp(56px, 5vw, 76px); line-height: .9; letter-spacing: -.03em; }
.hcard .metric .cnu { font-family: var(--cn); font-size: 36px; line-height: 1; font-weight: 900; -webkit-text-stroke: .02em currentColor; padding-bottom: .06em; }
.hcard .metric .brk { flex-basis: 100%; font-size: 15px; font-weight: 600; }
.hcard .metric.words { flex-direction: column; align-items: flex-start; gap: 0; }
.hcard .metric.words span { font-family: var(--cn); font-size: 38px; line-height: 1.1; font-weight: 900; -webkit-text-stroke: .022em currentColor; letter-spacing: .02em; }
.hcard-link { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-top: 14px; font-size: 14.5px; font-weight: 600;
  border-top: 1px solid color-mix(in srgb, currentColor 18%, transparent); }
.hcard-link .play { margin-right: 8px; background: var(--blue); vertical-align: -3px; }
.hcard-link .play::after { border-left-color: #fff; }
.hcard-link .ar { transition: transform .3s var(--ease); }
.hcard-link:hover .ar { transform: translateX(4px); }
.c5 .hcard-link, .c5 .metric .brk { color: var(--blue-ink); }

/* 一张带编号问题的卡（岗位 AI 机会卡） */
.qcard { position: relative; overflow: hidden; margin: 8px 0 0; padding: 26px 26px 22px; border-radius: 6px; background: var(--tint); color: var(--ink); }
.qcard::before { content: ""; position: absolute; left: 0; top: 0; height: 5px; width: 100%; background: var(--blue); }
.qcard-title { margin: 0 0 14px !important; font-family: var(--cn); font-size: 22px !important; font-weight: 900; -webkit-text-stroke: .02em currentColor; line-height: 1.3 !important; }
.qcard-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.qcard-list li { display: flex; gap: 10px; align-items: baseline; margin: 0; padding: 12px 14px; border-radius: 6px; background: #fff; font-size: 15px !important; line-height: 1.55 !important; }
.qcard-list .num { flex: none; color: var(--blue); font-size: 15px; }
.qcard-note { margin: 14px 0 0 !important; font-size: 13px !important; color: var(--ink-2); }

/* 赞赏页（/thanks/）：单卡居中，白底细线框。三档样式一致：白底细线框；选中档 2px 群青框 + 浅蓝灰底 + 群青金额 + 群青实心勾。
   档位切换纯 CSS（radio:checked + :has()），不用 JS；三套「二维码 + 按钮」都在 DOM 里，
   默认只显示 .pay-default，支持 :has() 的浏览器按选中档显示。二维码始终白底黑码。 */
.layout-page .sec > .container > .support { max-width: 580px; }
.support { margin: 0 auto; padding: clamp(28px, 5vw, 44px) clamp(16px, 4vw, 40px) clamp(24px, 4vw, 36px);
  border-radius: 6px; background: #fff; color: var(--ink); box-shadow: inset 0 0 0 1px var(--hair); text-align: center; }
.support-cup { display: block; width: 48px; height: 48px; margin: 0 auto 14px; color: var(--blue); }
.sec .support-title { margin: 0 0 12px; font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor; letter-spacing: -.01em;
  font-size: clamp(28px, 4.2vw, 38px); line-height: 1.2; color: var(--ink); }
.sec .support-sub { margin: 0 auto 4px !important; max-width: 26em; font-size: 15.5px !important; line-height: 1.8 !important; color: var(--ink-2); }
.sec .support-thanks { margin: 0 auto 26px !important; font-size: 15.5px !important; line-height: 1.8 !important; color: var(--ink); font-weight: 600; }
.tiers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(8px, 2.4vw, 14px); margin: 0 0 26px; padding: 0; border: 0; min-width: 0; }
.tier { display: flex; flex-direction: column; align-items: center; gap: 4px; min-width: 0; padding: 16px 6px 14px; border-radius: 6px;
  background: #fff; box-shadow: inset 0 0 0 1px var(--line); cursor: pointer; transition: box-shadow .15s ease, background-color .15s ease; }
.tier:hover { box-shadow: inset 0 0 0 1px var(--line-strong); }
.tier-amt { font-family: var(--lat); font-weight: 700; font-size: clamp(21px, 5.8vw, 30px); line-height: 1.1; letter-spacing: -.02em; color: var(--ink); }
.tier-amt .cur { margin-right: 1px; font-size: .55em; vertical-align: .45em; }
.tier-say { font-size: clamp(11.5px, 3.2vw, 14px); line-height: 1.35; color: var(--ink-2); }
.tier-tick { position: relative; width: 22px; height: 22px; margin-top: 8px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--line-strong); }
.tier-in:checked + .tier { background: var(--tint); box-shadow: inset 0 0 0 2px var(--blue); }
.tier-in:checked + .tier .tier-amt { color: var(--blue); }
.tier-in:checked + .tier .tier-tick { background: var(--blue); box-shadow: none; }
.tier-in:checked + .tier .tier-tick::after { content: ""; position: absolute; left: 8px; top: 4px; width: 6px; height: 11px; border: solid #fff; border-width: 0 2.2px 2.2px 0; transform: rotate(45deg); }
.tier-in:focus-visible + .tier { outline: 2px solid var(--blue); outline-offset: 3px; }
.pay { display: none; }
.pay-default { display: block; }
.support:has(.tier-in:checked) .pay { display: none; }
.support:has(#tier-99:checked) .pay-99, .support:has(#tier-199:checked) .pay-199, .support:has(#tier-499:checked) .pay-499 { display: block; }
.pay-qr { width: 232px; height: 232px; margin: 0 auto 18px; padding: 8px; border-radius: 6px; background: #fff; box-shadow: inset 0 0 0 1px var(--line); }
.pay-qr img { width: 216px; height: 216px; background: #fff; image-rendering: pixelated; }
.pay-go { display: flex; width: 100%; }
.sec .support-tip { margin: 16px 0 0 !important; font-size: 13.5px !important; line-height: 1.75 !important; color: var(--ink-2); text-align: left; }
.sec .support-fine { margin: 8px 0 0 !important; font-size: 13px !important; line-height: 1.7 !important; color: var(--ink-2); text-align: left; }
.sec .support-close { margin: 24px 0 0 !important; padding-top: 20px; border-top: 1px solid var(--hair); font-size: 16.5px !important; line-height: 1.85 !important; color: var(--ink); text-align: left; }
/* 「我的承诺」：close 之后一条细线隔开，小字安静，不抢支付按钮 */
.support-pledge { margin: 22px 0 0; padding-top: 18px; border-top: 1px solid var(--hair); text-align: left; }
.sec .support-pledge-h { margin: 0 0 6px; font-family: var(--cn); font-size: 14px; font-weight: 700; letter-spacing: .08em; line-height: 1.6; color: var(--ink-2); }
.sec .support-pledge-text { margin: 0 !important; font-size: 14px !important; line-height: 1.8 !important; color: var(--ink); }
.sec .support-record { margin: 8px 0 0 !important; font-size: 13px !important; line-height: 1.7 !important; color: var(--ink-2); }

/* 活动报名（草稿 /events/…/，build.py d_signup）：报名表只有称呼、邮箱；报名成功后表单原地换成「报名成功」面板，
   面板下部「赞赏与支持」：左 4 张档位卡（沿用上面 /thanks/ 的 .tier，2×2，¥0 = 捧个人场，默认都不选），右显示区；
   选卡纯 CSS（radio + :has()；signup.js 另写 data-pick 兜底）。窄屏卡片在上、显示区在下。活动页不放支付宝按钮。 */
/* 活动页（layout: event，build.py event_layout）：宽屏左介绍、右「事实卡 + 报名」，右栏随滚动停留；窄屏上下排 */
.layout-event .page-head { padding: clamp(24px, 2.8vw, 40px) 0 clamp(4px, 1vw, 12px); }
.layout-event .page-head h1 { margin-top: 10px; }
.sec.event-sec { padding-top: clamp(20px, 2.4vw, 28px); }
.event-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 36px; }
.event-main > :last-child, .event-side > :last-child { margin-bottom: 0; }
.event-side .gb-form, .event-side .form-privacy, .event-side .su-after { max-width: none; }
/* 右栏收紧：1440×900 首屏要能看到报名按钮 */
.event-side .gb-form { padding: clamp(16px, 1.8vw, 22px); }
.event-side .field { margin-bottom: 14px; }
.sec .event-side .su-notice { margin-bottom: 14px !important; }
.sec .event-side h2 { margin: 18px 0 10px; }
.sec .event-side .event-card + p { margin: 12px 0 0; font-size: 15.5px; line-height: 1.75; }
@media (min-width: 1024px) {
  .event-grid { grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr); gap: 0 64px; align-items: start; }
}
/* 右栏停留：只在视口够高时（右栏整块放得下），否则普通滚动，免得下半截被裁 */
@media (min-width: 1024px) and (min-height: 820px) {
  .event-side { position: sticky; top: 88px; }
}
/* 事实卡：白底、顶部 5px 群青条（同 .stats），时间加粗加大 */
.event-card { position: relative; overflow: hidden; padding: 22px 24px 18px; border-radius: 6px; background: #fff; box-shadow: inset 0 0 0 1px var(--hair); }
.event-card::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 5px; background: var(--blue); }
.event-facts { display: grid; gap: 12px; margin: 0; }
.event-fact dt { font-size: 13px; font-weight: 600; letter-spacing: .1em; color: var(--ink-2); }
.event-fact dd { margin: 2px 0 0; font-size: 16px; line-height: 1.6; color: var(--ink); }
.event-fact .event-when { font-size: clamp(20px, 1.9vw, 24px); font-weight: 800; line-height: 1.4; word-break: keep-all; }
.event-fact .nw { white-space: nowrap; }   /* 「8:30–10:00」这类时间段不拆开 */
/* 醒目提示块（报名按钮上方「线上、无回看」、面板里的邮箱提示）：浅蓝灰底 + 左侧群青线 */
.sec .su-notice, .sec .su-mail { padding: 12px 14px; border-radius: 6px; background: var(--tint); box-shadow: inset 3px 0 0 var(--blue);
  font-size: 15px !important; line-height: 1.75 !important; color: var(--ink); text-align: left; overflow-wrap: anywhere; }
.sec .su-notice { margin: 0 0 18px !important; }
/* 报名已满 / 已关闭（signup.js 加 .is-locked）：输入框变灰不可点，按钮沿用 .btn[disabled] 的半透明 */
.signup-form.is-locked input:disabled { background: var(--card); border-color: var(--line); color: var(--muted); cursor: not-allowed; }
.signup-form.is-locked label { color: var(--muted); }
.sec .su-hint { margin: 10px 0 0 !important; font-size: 13.5px !important; line-height: 1.7 !important; color: var(--ink-2); }
.su-done { max-width: 840px; margin-top: 8px; padding: clamp(22px, 3vw, 32px); border-radius: 6px; background: #fff;
  box-shadow: inset 0 0 0 1px var(--hair); scroll-margin-top: 84px; }
.su-done:focus, .su-done-h:focus, .su-after:focus { outline: none; }
/* 报名成功弹窗（showModal）：白卡细线框，内容过长时弹窗内部滚动；手机上左右各留 16px。面板本身去掉外框，避免框套框 */
.su-modal { width: min(880px, calc(100vw - 32px)); max-width: none; max-height: calc(100vh - 32px); max-height: calc(100dvh - 32px);
  margin: auto; padding: 0; border: 0; border-radius: 6px; background: #fff; color: var(--ink); overflow: auto; overscroll-behavior: contain;
  box-shadow: inset 0 0 0 1px var(--hair), 0 24px 64px rgba(26, 31, 51, .24); }
.su-modal::backdrop { background: rgba(26, 31, 51, .45); }
.su-modal .su-done { max-width: none; margin: 0; box-shadow: none; }
@media (prefers-reduced-motion: no-preference) {
  .su-modal[open] { animation: su-modal-in .22s var(--ease); }
  .su-modal[open]::backdrop { animation: su-fade-in .22s ease; }
}
@keyframes su-modal-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes su-fade-in { from { opacity: 0; } to { opacity: 1; } }
.sec .su-close-row { margin: 22px 0 0 !important; padding-top: 18px; border-top: 1px solid var(--hair); text-align: center; }
.su-close-row .btn { min-width: 160px; }
/* 关闭弹窗后，报名表的位置：已报名状态 + 「再看一下赞赏与支持」 */
.su-after { max-width: 640px; margin-top: 8px; padding: clamp(20px, 3vw, 28px); border-radius: 6px; background: #fff;
  box-shadow: inset 0 0 0 1px var(--hair); scroll-margin-top: 84px; }
.sec .su-after-h { margin: 0 0 12px !important; font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor;
  font-size: 22px !important; line-height: 1.4 !important; color: var(--ink); }
.sec .su-after-act { margin: 14px 0 0 !important; }
.su-after .btn { height: 44px; padding: 0 20px; font-size: 15px; }
.sec .su-done-h { margin: 0 0 14px; font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor;
  font-size: clamp(24px, 3.4vw, 30px); line-height: 1.3; color: var(--ink); }
.sec .su-mail { margin: 0 !important; font-weight: 600; }
.sec .su-online { margin: 10px 0 0 !important; font-size: 15px !important; line-height: 1.7 !important; color: var(--ink); }
.su-support { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--hair); }
.sec .su-support-h { margin: 0 0 6px; font-family: var(--cn); font-size: 19px; font-weight: 800; line-height: 1.5; color: var(--ink); }
.sec .su-support-note { margin: 0 0 16px !important; font-size: 14.5px !important; line-height: 1.8 !important; color: var(--ink-2); }
.sec .su-support-note strong { color: var(--ink); }
.su-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: stretch; }
.su-pick { min-width: 0; margin: 0; padding: 0; border: 0; }
.su-tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; }
.su-tiers .tier { justify-content: center; padding: 14px 8px 12px; text-align: center; }
.su-show { display: flex; flex-direction: column; justify-content: center; min-height: 300px; padding: 18px 14px; border-radius: 6px;
  background: var(--paper); box-shadow: inset 0 0 0 1px var(--line); text-align: center; }
.sec .su-placeholder { margin: 0 !important; font-size: 14.5px !important; line-height: 1.7 !important; color: var(--ink-2); opacity: .8; }
.su-pay { display: none; }
.su-grid:has(.tier-in:checked) .su-placeholder, .su-grid[data-pick] .su-placeholder { display: none; }
.su-grid:has(#su-t-none:checked) .su-pay-none, .su-grid:has(#su-t-99:checked) .su-pay-99,
.su-grid:has(#su-t-199:checked) .su-pay-199, .su-grid:has(#su-t-499:checked) .su-pay-499,
.su-grid[data-pick="none"] .su-pay-none, .su-grid[data-pick="99"] .su-pay-99,
.su-grid[data-pick="199"] .su-pay-199, .su-grid[data-pick="499"] .su-pay-499 { display: block; }
.sec .su-thanks { margin: 0 0 6px !important; font-size: 18px !important; line-height: 1.6 !important; font-weight: 700; color: var(--ink); }
.sec .su-pay-text { margin: 0 0 12px !important; font-size: 14.5px !important; line-height: 1.7 !important; color: var(--ink-2); }
.su-show .pay-qr { margin: 0 auto; }
/* 「支持」右上角的注释标记与浮层：悬停、键盘聚焦显示；手机点按由 signup.js 加 .is-open；浮层宽度不超过屏幕，JS 再夹回视口内 */
.su-tip { position: relative; display: inline-block; margin-left: 2px; vertical-align: super; line-height: 1; }
.su-tip-btn { display: inline-flex; align-items: center; justify-content: center; width: 17px; height: 17px; padding: 0; border: 1.5px solid var(--blue);
  border-radius: 50%; background: #fff; color: var(--blue); font: 700 11px/1 var(--lat); cursor: help; }
.su-tip-btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.su-tip-pop { display: none; position: absolute; z-index: 5; top: calc(100% + 8px); left: 50%; width: max-content;
  max-width: min(260px, calc(100vw - 32px)); padding: 10px 12px; border-radius: 6px; background: var(--ink); color: #fff;
  font-size: 13px; font-weight: 400; line-height: 1.7; text-align: left; white-space: normal; transform: translateX(calc(-50% + var(--shift, 0px))); }
.su-tip:hover .su-tip-pop, .su-tip-btn:focus-visible + .su-tip-pop, .su-tip.is-open .su-tip-pop { display: block; }
.sec .su-refund { margin: 16px 0 0 !important; font-size: 13px !important; line-height: 1.75 !important; color: var(--ink-2); }
.sec .su-refund strong { color: var(--ink); }
@media (max-width: 719px) {
  .su-grid { grid-template-columns: minmax(0, 1fr); }
  .su-show { min-height: 0; padding: 18px 12px; }
  .su-show .su-placeholder { padding: 24px 0; }
}

/* 关于页：肖像站在蓝块上，头肩破框 */
.page-portrait { position: relative; margin: 0; justify-self: end; width: 100%; max-width: 340px; aspect-ratio: 4 / 4.4; }
.page-portrait .slab { height: 62%; border-radius: 6px 6px 0 0; }
.page-portrait-img { position: absolute; left: 0; right: 0; bottom: 0; margin: 0 auto; height: 100%; width: auto; max-width: none; filter: drop-shadow(0 18px 30px rgba(16, 18, 46, .18)); }

/* ------------------------------------------------------------ 区块（Markdown 的 ## 分段） */
.sec { position: relative; padding: clamp(40px, 4.6vw, 68px) 0; }
.sec + .sec { border-top: 1px solid var(--hair); }
.sec h2 { font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .018em currentColor; letter-spacing: -.01em; font-size: clamp(24px, 2.2vw, 30px); line-height: 1.3; margin-bottom: clamp(20px, 2.4vw, 32px); color: var(--ink); }
.sec h3 { font-size: 20px; font-weight: 700; line-height: 1.45; margin: 1.6em 0 .6em; }
.sec p, .sec li { font-size: 17px; line-height: 1.9; }
.sec p { margin: 0 0 1em; }
.sec p a:not([class]), .sec li a:not([class]), .prose a:not([class]) { color: var(--blue-ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .22em; text-decoration-color: rgba(43, 59, 255, .35); }
.sec p a:not([class]):hover, .sec li a:not([class]):hover, .prose a:not([class]):hover { text-decoration-color: currentColor; }
.sec-row > .container { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 20px 64px; align-items: start; }
.sec-row > .container > h2 { grid-column: 1; margin: 0; position: sticky; top: 96px; }
.sec-row > .container > :not(h2) { grid-column: 2; max-width: none; }   /* 正文列填满到右边缘 */
.sec-row > .container > .topics, .sec-row > .container > .steps, .sec-row > .container > .heat { max-width: none; }
.sec > .container > :last-child { margin-bottom: 0; }
.sec ul:not([class]), .sec ol:not([class]) { padding-left: 1.2em; margin: 0 0 1em; }
/* 中文正文：左对齐的长段落两端对齐（按字间距分配），右边缘整齐；卡片、居中、短小字（都带 class 或在组件里）不动 */
.sec .container > p:not([class]), .event-main > p:not([class]), .prose > p:not([class]), .sec .lead {
  text-align: justify; text-justify: inter-character; }
/* 标题行首的全角括号、引号不留半格空（不支持的浏览器忽略） */
.display, .sec h2, .prose h2 { text-spacing-trim: trim-start; hanging-punctuation: first; }
.page-head.is-long h1 { font-size: clamp(34px, 4.8vw, 68px); }
.sec li { margin: .45em 0; }
.sec li::marker { color: var(--blue); }
.layout-page .sec > .container > *, .layout-notfound .sec > .container > * { max-width: 44em; }
.lead { font-size: 19px !important; line-height: 1.9; max-width: 38em; color: var(--ink); }
.note { font-size: 14px !important; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 12px 16px; margin: 28px 0 0 !important; }

/* 一排真实数字 */
.sec-stats { padding: 0 0 clamp(40px, 5vw, 64px); }
.sec-stats + .sec { border-top: 0; }
.stats { background: #fff; border-radius: 6px; box-shadow: inset 0 0 0 1px var(--hair); padding: 26px 28px 24px; position: relative; overflow: hidden; }
.stats::before { content: ""; position: absolute; left: 0; top: 0; height: 5px; width: 100%; background: var(--blue); }
.stats-note { margin: 0 0 14px !important; font-size: 13px !important; font-weight: 600; letter-spacing: .1em; color: var(--ink-2); }
.stats-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px 24px; }
.stats-list li { margin: 0; font-size: 14px !important; line-height: 1.5 !important; color: var(--ink-2); }
.stats-list b { display: flex; align-items: flex-end; height: clamp(40px, 3.8vw, 58px); color: var(--blue); font-size: clamp(34px, 3.4vw, 52px); line-height: 1; margin-bottom: 8px; }
.stats-list b.cn { font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor; font-size: clamp(28px, 2.6vw, 40px); }

/* 主题卡、三节课、升温卡、标签行 */
.topics { list-style: none; margin: 8px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.topics > li { margin: 0; display: flex; flex-direction: column; padding: 22px 22px 20px; background: #fff; border-radius: 6px; box-shadow: inset 0 0 0 1px var(--hair); }
.topics .topic-title { margin: 0 0 8px; font-family: var(--cn); font-size: 19px; font-weight: 900; -webkit-text-stroke: .015em currentColor; line-height: 1.35; }
.topics p { margin: 0 !important; font-size: 15px !important; line-height: 1.75 !important; color: var(--ink-2); }
.topics .topic-fact { margin-top: auto !important; padding-top: 14px; font-size: 13px !important; font-weight: 600; color: var(--blue-ink) !important; }
.steps { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--hair); }
.steps > li { margin: 0; display: grid; grid-template-columns: 88px minmax(0, 1fr); gap: 4px 20px; padding: 24px 0; border-bottom: 1px solid var(--hair); }
.steps-n { font-size: 46px; line-height: 1; color: var(--blue); }
.steps .steps-title { margin: 0 0 8px; font-family: var(--cn); font-size: clamp(20px, 2vw, 26px); font-weight: 900; -webkit-text-stroke: .018em currentColor; line-height: 1.3; }
.steps p { margin: 0 !important; color: var(--ink-2); }
.heat { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.heat > li { position: relative; overflow: hidden; margin: 0; padding: 26px 22px 22px; border-radius: 6px; min-height: 200px; }
.heat .gauge { position: absolute; left: 0; top: 0; height: 5px; width: 100%; transform-origin: 0 50%; }
.heat h3 { margin: 0 0 10px; font-family: var(--cn); font-size: 30px; font-weight: 900; -webkit-text-stroke: .02em currentColor; line-height: 1.1; }
.heat p { margin: 0 !important; font-size: 15px !important; line-height: 1.75 !important; }
.heat-c1 { background: #fff; box-shadow: inset 0 0 0 1px var(--hair); } .heat-c1 .gauge { background: var(--blue); transform: scaleX(.25); } .heat-c1 h3 { color: var(--blue); } .heat-c1 p { color: var(--ink-2); }
.heat-c2 { background: var(--tint-2); } .heat-c2 .gauge { background: var(--blue); transform: scaleX(.5); } .heat-c2 h3 { color: var(--blue); } .heat-c2 p { color: var(--ink-2); }
.heat-c3 { background: var(--tint-3); } .heat-c3 .gauge { background: var(--blue); transform: scaleX(.75); } .heat-c3 h3 { color: var(--blue-ink); } .heat-c3 p { color: var(--ink-2); }
.heat-c4 { background: var(--boil); } .heat-c4 .gauge { background: var(--blue); } .heat-c4 h3 { color: var(--blue-ink); } .heat-c4 p { color: #4A4530; }
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chips .chip { background: var(--tint); color: var(--blue-ink); height: 34px; padding: 0 14px; font-size: 14px; }
.chips-label { font-size: 13px; color: var(--ink-2); margin-right: 4px; }

/* 录像 */
.sec-video { padding-top: clamp(24px, 3vw, 40px); }
.video { margin: 0; max-width: 1040px; }
.video .kicker { margin-bottom: 18px; }
.video-frame { position: relative; border-radius: 8px; overflow: hidden; background: #0B0D24; box-shadow: 0 24px 50px -30px rgba(26, 31, 51, .45); aspect-ratio: 8 / 5; }
.video video { display: block; width: 100%; height: 100%; background: #0B0D24; }
.video figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 24px; margin-top: 14px; font-size: 15px; line-height: 1.75; color: var(--ink-2); }
.video figcaption span { max-width: 46em; }
/* 播放按钮（首屏只有海报；点了才接上 HLS）与清晰度切换。没有 JS 时两者都不显示，只留一句提示 */
.video-play { position: absolute; inset: 0; display: none; align-items: center; justify-content: center; width: 100%; height: 100%; padding: 0; border: 0; background: transparent; cursor: pointer; }
.js .video-play { display: flex; }
.video-play[hidden], .js .video-play[hidden] { display: none; }
.video-play i { position: relative; width: clamp(64px, 9vw, 88px); height: clamp(64px, 9vw, 88px); border-radius: 50%; background: var(--blue); box-shadow: 0 14px 30px -12px rgba(11, 13, 36, .7); transition: transform .2s ease, background-color .2s ease; }
.video-play i::after { content: ""; position: absolute; left: 54%; top: 50%; transform: translate(-50%, -50%); border-style: solid; border-width: 13px 0 13px 21px; border-color: transparent transparent transparent #fff; }
.video-play:hover i, .video-play:focus-visible i { background: var(--blue-hi); transform: scale(1.06); }
.video-play:focus-visible { outline: none; }
.video-play:focus-visible i { outline: 3px solid #fff; outline-offset: 3px; }
.video.is-loading .video-play i { opacity: .7; }
.video-nojs, .video-msg { position: absolute; left: 12px; right: 12px; bottom: 12px; margin: 0; padding: 8px 12px; border-radius: 6px; background: rgba(11, 13, 36, .82); color: #fff; font-size: 14px; font-weight: 600; line-height: 1.5; text-align: center; }
.video-msg[hidden] { display: none; }
.video-q { display: none; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 12px; }
.js .video-q { display: flex; }
.video-q-label { margin-right: 4px; font-size: 13px; font-weight: 700; color: var(--ink-2); }
.video-q-btn { min-width: 52px; height: 34px; padding: 0 12px; border: 1.5px solid rgba(52, 70, 196, .28); border-radius: 999px; background: #fff; color: var(--ink); font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; transition: background-color .15s ease, color .15s ease, border-color .15s ease; }
.video-q-btn:hover { border-color: var(--blue); color: var(--blue-ink); }
.video-q-btn[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: #fff; }
@media (max-width: 719px) {
  .video-q { gap: 8px; }
  .video-q-btn { height: 40px; min-width: 60px; font-size: 14px; }
}

/* 用到的系统、页尾提问 */
.sec-uses { padding-top: 0 !important; border-top: 0 !important; }
.uses { margin: 0 !important; font-size: 16px !important; color: var(--ink-2); }
.uses a { font-weight: 700; color: var(--blue); }
.uses a:hover { text-decoration: underline; }
.sec-next { padding: clamp(56px, 7vw, 104px) 0 !important; }
.next { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px 40px; }
.next-q { font-size: clamp(28px, 3.6vw, 52px) !important; line-height: 1.2 !important; color: var(--ink); max-width: 15em; margin: 0 !important; text-wrap: balance; }

/* ------------------------------------------------------------ 做的东西（/apps/）
   上课吧做头牌（浅蓝灰卡）；三个 App 卡各带自己皮肤的暗示，配色固定。 */
.flagship { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 40px 56px; padding: clamp(28px, 4vw, 56px); border-radius: 6px;
  background: var(--tint); color: var(--ink); position: relative; overflow: hidden; }
.flagship::before { content: ""; position: absolute; left: 0; top: 0; height: 5px; width: 100%; background: var(--blue); }
.flagship p { color: inherit; }
.flagship-kicker { margin: 0 0 18px !important; font-size: 14px !important; letter-spacing: .1em; color: var(--ink-2) !important; }
.flagship-proof { margin: 0 0 18px !important; font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .02em currentColor; font-size: clamp(26px, 2.6vw, 36px) !important; line-height: 1.25 !important; }
.flagship-proof b { font-family: var(--lat); font-weight: 700; -webkit-text-stroke: 0; font-size: 1.6em; color: var(--blue); margin-right: 4px; letter-spacing: -.03em; }
.flagship-lead { margin: 0 !important; font-size: 17px !important; line-height: 1.9 !important; color: var(--ink-2) !important; }
.flagship .actions { margin-top: 28px !important; }
.flagship .commits-line { margin: 24px 0 0; color: var(--ink-2); }
.flagship .commits-line .num { color: var(--ink); }
.flagship .spark { fill: var(--blue); opacity: .7; }
.flagship-features { list-style: none; margin: 0; padding: 0; align-self: start; border-top: 1px solid var(--hair); }
.flagship-features > li { margin: 0; padding: 16px 0; border-bottom: 1px solid var(--hair); }
.flagship .flagship-ft { margin: 0 0 4px; font-size: 18px; font-weight: 700; color: var(--ink); }
.flagship-features p { margin: 0 !important; font-size: 15px !important; line-height: 1.75 !important; color: var(--ink-2) !important; }
.appcards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.appcards > li { margin: 0; }
.appcard { display: flex; flex-direction: column; height: 100%; padding: 24px; border-radius: 24px; transition: transform .3s var(--ease); }
.appcard:hover { transform: translateY(-4px); }
.appcard-head { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.appcard-icon { flex: none; width: 64px; height: 64px; }
.appcard .appcard-name { margin: 0; font-size: 24px; line-height: 1.25; font-weight: 800; }
.appcard-en { margin: 2px 0 0 !important; font-size: 14px !important; line-height: 1.4 !important; opacity: .8; }
.appcard-text { margin: 0 0 20px !important; font-size: 15px !important; line-height: 1.75 !important; }
.appcard-shot { margin: 0 0 20px; }
.appcard-shot img { display: block; margin: 0 auto; max-height: 220px; width: auto; }
.appcard-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: auto 0 0 !important; font-size: 13px !important; }
.appcard-status { padding: 1px 10px; border: 1px solid currentColor; border-radius: 999px; }
.appcard-go { margin-left: auto; font-size: 18px; }
.appcard-pomotap { background: #0B0B0D; color: #F4F3F1; }
.appcard-pomotap .appcard-icon { border-radius: 50%; }
.appcard-pomotap .appcard-name { font-family: ui-rounded, "SF Pro Rounded", var(--cn); color: #F4F3F1; }
.appcard-pomotap .appcard-shot img { border-radius: 18%; }
.appcard-pomotap .appcard-status, .appcard-pomotap .appcard-go { color: #FF6B3D; }
.appcard-flit { background: linear-gradient(140deg, #EEF3FA 0%, #DCE6F3 100%); color: #13202E; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .7); }
.appcard-flit .appcard-icon { padding: 8px; border-radius: 22%; background: rgba(255, 255, 255, .72); }
.appcard-flit .appcard-name { font-weight: 600; color: #13202E; }
.appcard-flit .appcard-shot img { border-radius: 12px; background: rgba(255, 255, 255, .6); }
.appcard-flit .appcard-status, .appcard-flit .appcard-go { color: #1F5FC4; }
.appcard-gule { background: #FBFAF5 repeating-linear-gradient(0deg, transparent 0, transparent 31px, rgba(31, 77, 58, .12) 31px, rgba(31, 77, 58, .12) 32px); color: #1A2E24; box-shadow: inset 0 0 0 1px #D9DDD0; }
.appcard-gule .appcard-icon { border-radius: 22%; }
.appcard-gule .appcard-name { color: #1F4D3A; }
.appcard-gule .appcard-en { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.appcard-gule .appcard-status, .appcard-gule .appcard-go { color: #1F4D3A; }

/* 时间线、提交节律（产品页开发手记） */
.timeline { list-style: none; margin: 0 0 20px; padding: 0; border-top: 1px solid var(--line); }
.timeline li { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 4px 20px; margin: 0; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 16px; line-height: 1.7; }
.tl-date { color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; padding-top: 2px; }
.commits-line { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; margin: 0 0 20px; font-size: 14px; color: var(--muted); }
.commits-line .num { color: var(--text); }
.spark { flex: none; fill: var(--muted); }

/* 图片 */
.figure { margin: 0 0 28px; }
.figure-media { position: relative; background: var(--surface); border-radius: 6px; overflow: hidden; }
.figure-media img { display: block; width: 100%; }
.fit-contain .figure-media { padding: clamp(12px, 3vw, 28px); }
.fit-contain .figure-media img { max-height: 520px; width: auto; margin: 0 auto; }
.figure figcaption { margin-top: 10px; font-size: 13px; line-height: 1.6; color: var(--muted); }

/* ------------------------------------------------------------ 正文排版（文章） */
.note-head { padding-bottom: clamp(24px, 3vw, 36px); }
.note-head h1 { font-size: clamp(34px, 4.6vw, 60px); line-height: 1.15; }
.note-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; margin-top: 22px; font-size: 14px; color: var(--ink-2); }
.note-meta time { font-weight: 600; letter-spacing: 0; }
.note-lines { display: inline-flex; flex-wrap: wrap; gap: 6px; margin: 0; }
.line-chip { display: inline-flex; align-items: center; height: 26px; padding: 0 10px; border-radius: 999px; background: var(--tint); color: var(--blue-ink); font-size: 12.5px; font-weight: 600; white-space: nowrap; transition: background-color .2s, color .2s; }
.line-chip:hover { background: var(--blue); color: #fff; }
.prose { position: relative; padding-top: clamp(24px, 3vw, 40px); padding-bottom: clamp(56px, 7vw, 96px); font-size: 18px; line-height: 1.95; }
.prose p { margin: 0 0 1.15em; }
.prose h2 { font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .016em currentColor; font-size: 26px; line-height: 1.35; margin: 1.9em 0 .7em; }
.prose h3 { font-size: 21px; font-weight: 700; line-height: 1.45; margin: 1.6em 0 .6em; }
.prose h4 { font-size: 18px; font-weight: 700; margin: 1.4em 0 .5em; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.15em; }
.prose li { margin: .4em 0; }
.prose li::marker { color: var(--blue); }
.prose strong { color: var(--ink); }
.prose img { border-radius: 6px; }
.prose .figure img, .prose > p > img { margin: 8px 0; }
blockquote { margin: 0 0 1.15em; padding: 4px 0 4px 20px; border-left: 3px solid var(--blue); color: var(--ink-2); }
blockquote p:last-child { margin-bottom: 0; }
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .88em; background: var(--tint); color: var(--blue-ink); padding: .1em .38em; border-radius: 4px; }
pre { overflow-x: auto; background: #fff; box-shadow: inset 0 0 0 1px var(--hair); border-radius: 6px; padding: 16px 18px; font-size: 14px; line-height: 1.6; }
pre code { background: none; color: var(--ink); padding: 0; }
hr { border: 0; border-top: 1px solid var(--hair); margin: 2.2em 0; }
.table-wrap { overflow-x: auto; margin: 0 0 1.2em; }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.7; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; border-bottom: 2px solid var(--text); }
.note-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; margin: 52px 0 0 !important; padding: 22px 24px; border-radius: 6px;
  background: #fff; box-shadow: inset 0 0 0 1px var(--hair); font-size: 17px; font-weight: 600; }
.note-cta .btn { height: 48px; font-size: 16px; }

/* 文章列表 */
.notes-index { position: relative; padding-bottom: clamp(56px, 7vw, 96px); }
.tag-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }
.tag { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 14px; border-radius: 999px; background: #fff; box-shadow: inset 0 0 0 1px var(--hair); font-size: 14px; font-weight: 600; color: var(--ink-2); transition: background-color .2s, color .2s; }
.tag .num { font-size: 12px; opacity: .7; }
.tag:hover { color: var(--blue); }
.tag.is-active { background: var(--blue); color: #fff; box-shadow: none; }
.year-group + .year-group { margin-top: 48px; }
.year { font-size: 15px; color: var(--blue); margin-bottom: 12px; letter-spacing: 0; }
.note-list { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.note-item { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 8px 32px; margin: 0; padding: 26px 0; border-bottom: 1px solid var(--hair); }
.note-item .date { font-size: 15px; color: var(--ink-2); padding-top: 4px; letter-spacing: 0; }
.note-title { font-family: var(--cn); font-size: 23px; font-weight: 900; -webkit-text-stroke: .015em currentColor; line-height: 1.4; margin: 0 0 8px; }
.note-title a { transition: color .2s; }
.note-title a:hover { color: var(--blue); }
.note-summary { color: var(--ink-2); margin: 0 0 12px; font-size: 16px; line-height: 1.75; max-width: 46em; }
.note-item .note-lines { display: flex; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 44px; }
.pager a { display: block; padding: 16px 0; border-top: 2px solid var(--ink); font-family: var(--cn); font-weight: 900; -webkit-text-stroke: .012em currentColor; font-size: 17px; line-height: 1.5; transition: color .2s; }
.pager a:hover { color: var(--blue); }
.pager a .muted { display: block; font-family: var(--font); font-weight: 500; -webkit-text-stroke: 0; font-size: 13px; color: var(--ink-2); margin-bottom: 4px; }
.pager-next { grid-column: 2; text-align: right; }

/* 404 */
.layout-notfound .sec-intro ul { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 12px; }
.layout-notfound .sec-intro li { margin: 0; }
.layout-notfound .sec-intro li a { display: inline-flex; align-items: center; height: 48px; padding: 0 22px; border-radius: 999px; background: var(--blue); color: #fff; font-weight: 600; text-decoration: none; }
.layout-notfound .sec-intro li a:hover { background: var(--blue-hi); }

/* ------------------------------------------------------------ 表单 */
.gb-form { max-width: 640px; margin-top: 8px; padding: clamp(22px, 3vw, 32px); background: #fff; border-radius: 6px; box-shadow: inset 0 0 0 1px var(--hair); }
.product .gb-form { background: var(--surface); box-shadow: none; border-radius: 22px; }
.field { margin: 0 0 22px; }
.field label, .reply-label { display: block; font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.label-note { font-weight: 400; color: var(--muted); }
input[type="text"], input[type="email"], input[type="password"], select, textarea {
  width: 100%; font: 16px/1.6 var(--font); color: var(--text); background: var(--field);
  border: 1.5px solid var(--line-strong); border-radius: 10px; padding: 11px 14px; }
textarea { resize: vertical; min-height: 140px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); }
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--err); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.hint { margin: 6px 0 0 !important; font-size: 13px !important; line-height: 1.6 !important; color: var(--muted); }
.field-err { margin: 6px 0 0 !important; font-size: 13px !important; color: var(--err); }
.field-foot { display: flex; justify-content: space-between; gap: 12px; }
.count { margin-left: auto; font-size: 12px; color: var(--muted); padding-top: 6px; font-variant-numeric: tabular-nums; }
.count.is-over { color: var(--err); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-actions { margin: 8px 0 0; }
.gb-form .btn-primary { background: var(--accent); color: var(--on-accent); }
.form-status:empty { display: none; }
.form-status { margin-top: 18px; padding: 12px 16px; font-size: 15px; border-radius: 10px; background: var(--tint); color: var(--ink); }
.product .form-status { background: var(--surface); color: var(--text); }
.form-status.is-err { box-shadow: inset 3px 0 0 var(--err); }
.form-status.is-ok { box-shadow: inset 3px 0 0 var(--accent); }
.form-nojs { padding: 12px 16px; background: var(--tint); border-radius: 10px; font-size: 15px; }
.js .form-nojs { display: none; }
.form-privacy { max-width: 640px; margin: 20px 0 0 !important; font-size: 13px !important; line-height: 1.75 !important; color: var(--muted); }
.form-privacy a { color: var(--accent); font-weight: 600; }
.email-line { margin: 28px 0 0; font-size: 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; }
.email-line a { font-weight: 600; overflow-wrap: anywhere; }
.btn-copy { font: 13px/1 var(--font); padding: 6px 10px; border: 1px solid var(--line-strong); border-radius: 999px; background: transparent; color: var(--text); cursor: pointer; }
.btn-copy:hover { border-color: var(--text); }
.copy-status { font-size: 13px; color: var(--muted); }

/* ------------------------------------------------------------ 收件箱（站主私有）
   宽屏（≥900px）邮件客户端式双栏：左列表、右详情，各自滚动；窄屏先列表，点进去看详情（.mail.is-open）。 */
.layout-inbox .page-head { padding: clamp(36px, 4vw, 56px) 0 8px; }
.layout-inbox .page-head h1 { margin-top: 12px; font-size: clamp(34px, 4vw, 52px); }
.layout-inbox .subtitle { margin-top: 10px; font-size: 15px; }
.inbox { padding-top: 8px; padding-bottom: 64px; }
.inbox-login { max-width: 420px; }
.inbox-top { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; border-bottom: 2px solid var(--ink); }
.inbox-tabs { display: flex; gap: 4px; }
.inbox-tab { position: relative; display: inline-flex; align-items: center; gap: 8px; height: 44px; padding: 0 16px; border: 0; background: none;
  font: 600 16px/1 var(--font); color: var(--ink-2); cursor: pointer; }
.inbox-tab:hover { color: var(--ink); }
.inbox-tab[aria-selected="true"] { color: var(--blue); }
.inbox-tab[aria-selected="true"]::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: -2px; height: 3px; background: var(--blue); border-radius: 3px 3px 0 0; }
.inbox-tab:focus-visible { outline: 2px solid var(--blue); outline-offset: -2px; border-radius: 8px; }
.inbox-tab-count:empty { display: none; }
.inbox-tab-count { min-width: 22px; padding: 2px 7px; border-radius: 999px; background: var(--blue); color: #fff; font-size: 12px; line-height: 1.3; text-align: center; }
.inbox-top .btn { margin-bottom: 6px; }
.inbox-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 24px; padding: 14px 0; }
.inbox-stats { margin: 0; font-weight: 600; }
.inbox-filters { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; font-size: 14px; }
.inbox-filters select { width: auto; padding: 6px 10px; font-size: 14px; }
.inbox-notice { margin: 0 0 12px; padding: 12px 16px; font-size: 14px; background: var(--tint); border-radius: 10px; }
.inbox-mail { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; }
.inbox-mail[hidden], .inbox-notice[hidden] { display: none; }
.inbox-mail-status { margin: 0; }
.inbox-mail-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.inbox-mail-link { flex-basis: 100%; margin: 0; overflow-wrap: anywhere; }
.pill-strong { background: var(--blue); color: #fff; }

.mail { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  height: calc(100vh - 88px); height: calc(100dvh - 88px); min-height: 460px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow: hidden; }
.mail-list-pane { min-width: 0; overflow-y: auto; overscroll-behavior: contain; border-right: 1px solid var(--line); background: var(--paper); }
.mail-detail-pane { min-width: 0; overflow-y: auto; overscroll-behavior: contain; padding: 24px clamp(20px, 3vw, 36px) 32px; }
.mail-detail-pane:focus { outline: none; }
.mail-list { list-style: none; margin: 0; padding: 0; }
.mail-item { border-bottom: 1px solid var(--line); }
.mail-row { display: block; width: 100%; padding: 12px 16px 12px 22px; border: 0; border-left: 3px solid transparent; background: none;
  font: 14px/1.5 var(--font); color: var(--ink-2); text-align: left; cursor: pointer; }
.mail-row:hover { background: var(--card); }
.mail-row:focus-visible { outline: 2px solid var(--blue); outline-offset: -2px; }
.mail-item.is-selected .mail-row { background: var(--tint-2); border-left-color: var(--blue); }
.mail-row-top { position: relative; display: flex; align-items: baseline; gap: 8px; }
.mail-dot { position: absolute; left: -13px; top: 50%; width: 7px; height: 7px; margin-top: -3px; border-radius: 50%; overflow: hidden; color: transparent; font-size: 0; }
.mail-item.is-unread .mail-dot { background: var(--blue); }
.mail-name { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-size: 15px; font-weight: 500; color: var(--ink); }
.mail-item.is-unread .mail-name { font-weight: 800; }
.mail-time { flex: none; font-size: 12px; font-weight: 600; color: var(--ink-2); }
.mail-item.is-unread .mail-time { color: var(--blue); }
.mail-row-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 4px 0 2px; }
.mail-replied { font-size: 12px; color: var(--ink-2); }
.mail-snippet { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.mail-item.is-unread .mail-snippet { color: var(--ink); }
.mail-list-pane .inbox-empty { margin: 0; padding: 24px 22px; }
.mail-more { margin: 0; padding: 14px 16px 4px; text-align: center; }
.mail-more:has(> [hidden]) { display: none; }
.mail-keys { margin: 0; padding: 10px 16px 16px; font-size: 12px; text-align: center; }
.mail-placeholder { display: grid; place-items: center; min-height: 100%; margin: 0; color: var(--ink-3); font-size: 16px; }
.mail-back { display: none; margin: 0 0 14px; padding: 6px 0; border: 0; background: none; font: 600 15px/1.4 var(--font); color: var(--blue); cursor: pointer; }
.mail-head { padding-bottom: 14px; margin-bottom: 16px; border-bottom: 1px solid var(--line); }
.mail-subject { margin: 0 0 6px; font-size: 24px; line-height: 1.3; color: var(--ink); overflow-wrap: anywhere; }
.inbox-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; margin: 0; font-size: 14px; color: var(--ink-2); }
.inbox-contact { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 8px 0 0; font-size: 15px; overflow-wrap: anywhere; }
.inbox-body { white-space: pre-wrap; margin: 0 0 12px; overflow-wrap: anywhere; }
.mail-body { font-size: 16px; line-height: 1.85; color: var(--ink); }
.inbox-ua summary { cursor: pointer; font-size: 13px; color: var(--ink-2); }
.inbox-ua p { font-size: 12px; color: var(--ink-2); overflow-wrap: anywhere; }
.inbox-actions { display: flex; gap: 8px; margin-top: 18px; }
.replies { margin: 14px 0 0; padding: 12px 16px; background: var(--tint); border-radius: 10px; }
.replies-title { margin: 0 0 6px; font-size: 13px; letter-spacing: .08em; color: var(--ink-2); }
.reply-list { list-style: none; margin: 0; padding: 0; }
.reply-item + .reply-item { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--hair); }
.reply-meta { display: flex; gap: 10px; align-items: center; margin: 0 0 4px; font-size: 13px; color: var(--ink-2); }
.reply-body { margin: 0; white-space: pre-wrap; font-size: 15px; overflow-wrap: anywhere; }
.reply-item.is-failed .reply-body { color: var(--ink-2); }
.reply-form { margin-top: 18px; }
.reply-input { min-height: 120px; }
.reply-foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; margin-top: 8px; }
.reply-status { margin: 0; font-size: 13px; color: var(--ink-2); overflow-wrap: anywhere; }
.reply-status.is-err { color: var(--err); }
@media (max-width: 899px) {
  .mail { display: block; height: auto; min-height: 0; border: 0; border-radius: 0; background: none; overflow: visible; }
  .mail-list-pane { overflow: visible; border: 1px solid var(--line); border-radius: 12px; }
  .mail-detail-pane { display: none; overflow: visible; padding: 0; }
  .mail.is-open .mail-list-pane { display: none; }
  .mail.is-open .mail-detail-pane { display: block; }
  .mail-back { display: inline-block; }
  .mail-keys { display: none; }
  .mail-subject { font-size: 21px; }
  .inbox-tab { padding: 0 12px; }
}

/* 访问统计：配色只用群青（浏览量）+ 琥珀（访客，柱上的折线），文字一律墨色 */
.visits { --pv: var(--blue); --uv: #B8791A; }
.visits-range { display: inline-flex; padding: 3px; border-radius: 999px; background: var(--card); box-shadow: inset 0 0 0 1px var(--line); }
.visits-range-btn { height: 32px; padding: 0 14px; border: 0; border-radius: 999px; background: none; font: 600 14px/1 var(--font); color: var(--ink-2); cursor: pointer; }
.visits-range-btn[aria-pressed="true"] { background: var(--blue); color: #fff; }
.visits-range-btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.visits-cards { list-style: none; margin: 0 0 16px; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.visits-card { display: flex; flex-direction: column; gap: 2px; padding: 16px 18px; border-radius: 12px; background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }
.visits-card-label { font-size: 14px; color: var(--ink-2); }
.visits-card-num { font-size: 34px; line-height: 1.15; color: var(--ink); }
.visits-card-sub { font-size: 12px; }
.visits-block { min-width: 0; padding: 18px 20px; border-radius: 12px; background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }
.visits-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 16px; }
.visits-title { margin: 0 0 10px; font-size: 16px; color: var(--ink); }
.visits-sub { margin-top: 20px; }
.visits-legend { display: flex; align-items: center; gap: 6px; margin: 0 0 10px; font-size: 13px; color: var(--ink-2); }
.visits-legend .key { display: inline-block; width: 12px; height: 12px; border-radius: 3px; }
.visits-legend .key-pv { background: var(--pv); }
.visits-legend .key-uv { height: 3px; margin-left: 10px; background: var(--uv); border-radius: 2px; }
.visits-chart { position: relative; }
.chart-svg { display: block; width: 100%; height: auto; touch-action: pan-y; }
.chart-grid { stroke: var(--line); stroke-width: 1; }
.chart-base { stroke: var(--line-strong); stroke-width: 1; }
.chart-tick { font: 11px var(--lat); fill: var(--ink-2); }
.chart-bar { fill: var(--pv); }
.chart-line { fill: none; stroke: var(--uv); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart-dot { fill: var(--uv); stroke: var(--surface); stroke-width: 2; }
.chart-hover { fill: var(--tint); }
.chart-tip { position: absolute; top: 0; transform: translateX(8px); display: flex; flex-direction: column; padding: 6px 10px; border-radius: 8px;
  background: var(--ink); color: #fff; font-size: 13px; line-height: 1.5; white-space: nowrap; pointer-events: none; }
.chart-tip[hidden] { display: none; }
.chart-tip.is-right { transform: translateX(calc(-100% - 8px)); }
.visits-table-toggle { margin-top: 10px; font-size: 14px; }
.visits-table-toggle summary { cursor: pointer; color: var(--ink-2); }
.visits-scroll { max-height: 320px; overflow-y: auto; margin-top: 8px; }
.visits-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.visits-wide { grid-column: 1 / -1; }
.visits-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 14px; }
.visits-table th { padding: 6px 8px; border-bottom: 1px solid var(--line-strong); text-align: left; font-size: 13px; font-weight: 600; color: var(--ink-2); }
.visits-table td { padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; overflow-wrap: anywhere; }
.visits-table th.num, .visits-table td.num { width: 64px; text-align: right; }
.visits-table th:first-child, .visits-table td:first-child { padding-left: 0; }
.visits-table th:last-child, .visits-table td:last-child { padding-right: 0; }
.visits-page a { color: var(--ink); font-weight: 600; }
.visits-page a:hover, .visits-recent-page:hover { color: var(--blue); text-decoration: underline; }
.visits-path { display: block; font-size: 12px; font-weight: 500; color: var(--ink-2); }
.visits-bars { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: 14px; }
.visits-bar { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 12px; }
.visits-bar-val { font-size: 13px; color: var(--ink-2); white-space: pre; }
.visits-bar-track { grid-column: 1 / -1; height: 8px; border-radius: 4px; background: var(--card); overflow: hidden; }
.visits-bar-fill { display: block; height: 100%; border-radius: 4px; background: var(--pv); }
.visits-recent { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.visits-recent-item { display: grid; grid-template-columns: 128px minmax(0, 1fr) auto; align-items: baseline; gap: 2px 14px; padding: 7px 0; border-bottom: 1px solid var(--line); }
.visits-recent-item time { font-size: 13px; font-weight: 600; }
.visits-recent-page { min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; color: var(--ink); }
.visits-recent-meta { font-size: 13px; }
.visits-foot { margin: 14px 0 0; font-size: 13px; line-height: 1.7; }
@media (max-width: 899px) {
  .visits-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .visits-grid { grid-template-columns: minmax(0, 1fr); }
  .visits-block { padding: 14px; }
  .visits-card-num { font-size: 28px; }
  .visits-recent-item { grid-template-columns: minmax(0, 1fr); }
}

/* ------------------------------------------------------------ 产品家族（docs/重构方案-v4.md 第四节）
   骨架：顶部细栏 → 首屏 → 截图 → 功能 → 系统要求 → 常见问题 → 统一页脚。
   皮肤：/assets/css/skin-{产品}.css 只覆盖 --bg --surface --text --muted --line --accent 等变量（build.py 生成）。
   v6：细栏和页脚用相长的字标（x → z，奶黄箭头）和字体；页面主体仍是产品自己的皮肤。 */
.product { --rounded: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, var(--cn); }
.product h1, .product h2, .product h3, .product h4 { font-family: var(--rounded); letter-spacing: 0; color: var(--text); }
.product .sec + .sec { border-top-color: var(--line); }
.product .sec p, .product .sec li { font-size: 16px; line-height: 1.8; }
.product .sec p a:not([class]), .product .sec li a:not([class]) { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.product .sec li::marker { color: var(--accent); }
.product .btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: none; }
.product .btn-primary:hover { filter: brightness(1.06); background: var(--accent); }
.product .mark { font-size: 15px; gap: 6px; }
.product .mark .z { margin-left: 4px; }
.product .mark .track { width: 26px; }
.product .mark .fill { background: var(--boil); }
.product .mark .head { border-color: var(--boil); width: 7px; height: 7px; margin: -3.5px 0 0 -5px; transform: translateX(26px) rotate(45deg); }
.pbar { border-bottom: 1px solid var(--line); }
.pbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 8px 24px; min-height: 60px; }
.pbar-name { display: inline-flex; align-items: center; gap: 10px; min-width: 0; font-family: var(--rounded); font-weight: 700; font-size: 16px; line-height: 1.2; }
.pbar-icon { width: 28px; height: 28px; border-radius: 50%; flex: none; }
.pbar-en { font-weight: 500; font-size: 14px; color: var(--muted); }
.pbar-back { flex: none; display: inline-flex; align-items: center; gap: 10px; height: 34px; padding: 0 14px 0 12px; border-radius: 999px; font-size: 13.5px; font-weight: 600; color: var(--text); box-shadow: inset 0 0 0 1px var(--line-strong); white-space: nowrap; transition: background-color .2s; }
.pbar-back:hover { background: var(--surface); }
.pbar-arrow { opacity: .6; }
.phero { padding: clamp(40px, 7vw, 104px) 0 clamp(48px, 7vw, 104px); }
.phero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 40px 64px; align-items: center; }
.phero-icon { display: block; width: 112px; height: 112px; margin: 0 0 28px; border-radius: 50%; }
.phero-name { font-size: clamp(52px, 7vw, 92px); font-weight: 800; line-height: 1.05; }
.phero-en { display: block; margin-top: 14px; font-size: .34em; font-weight: 600; line-height: 1.2; letter-spacing: .02em; color: var(--muted); }
.phero-tagline { max-width: 22em; margin: 24px 0 0; font-size: clamp(18px, 2vw, 22px); line-height: 1.7; }
.phero-actions { margin: 32px 0 0; }
.btn-store { height: 54px; padding: 0 28px; font-size: 17px; }
.phero-note { margin: 14px 0 0; font-size: 14px; color: var(--muted); }
.phero-visual { justify-self: center; width: 100%; max-width: 360px; }
.ring-watch { position: relative; display: grid; place-items: center; aspect-ratio: 416 / 496; padding: 10%; background: #000; border-radius: 30% / 25%; box-shadow: inset 0 0 0 1px var(--line-strong); }
.ring-svg { display: block; width: 100%; height: auto; }
.ring-track { fill: none; stroke: var(--accent); stroke-opacity: .2; stroke-width: 18; }
.ring-prog { fill: none; stroke: var(--accent); stroke-width: 18; stroke-linecap: round; stroke-dasharray: 100; stroke-dashoffset: 51.6; animation: ring-fill 1.6s cubic-bezier(.2, .7, .2, 1) both; }
@keyframes ring-fill { from { stroke-dashoffset: 100; } }
.ring-face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 0; }
.ring-time { font-family: var(--rounded); font-weight: 700; font-size: clamp(48px, 6vw, 68px); line-height: 1; color: #FFFFFF; font-variant-numeric: tabular-nums; }
.ring-label { margin-top: 10px; font-size: 15px; font-weight: 600; line-height: 1.2; color: var(--accent); }
.product .sec h2 { font-family: var(--rounded); -webkit-text-stroke: 0; font-size: clamp(26px, 3vw, 34px); font-weight: 800; }
.product .sec > .container > * { max-width: 44em; }
.product .sec > .container > .gallery, .product .sec > .container > .features { max-width: none; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 24px; margin: 40px 0 32px; }
.gallery figure { margin: 0; }
.gallery img { display: block; width: 100%; max-width: 208px; margin: 0 auto; border-radius: 22%; background: #000; }
.gallery figcaption { margin-top: 10px; font-size: 14px; line-height: 1.6; color: var(--muted); text-align: center; }
.product .gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px 28px; margin: 0; }
.product .gallery img { max-width: 240px; border-radius: 18%; }
.features { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.features > li { margin: 0; padding: 24px 24px 22px; background: var(--surface); border-radius: 22px; }
.features > li::before { content: ""; display: block; width: 10px; height: 10px; margin-bottom: 18px; border-radius: 50%; background: var(--accent); }
.product .feature-title { margin: 0 0 6px; font-size: 20px; font-weight: 700; }
.features p { margin: 0 !important; font-size: 15px !important; line-height: 1.75 !important; color: var(--muted); }
.specs { margin: 0; border-top: 1px solid var(--line); }
.specs > div { display: grid; grid-template-columns: 9em minmax(0, 1fr); gap: 4px 24px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.specs dt { color: var(--muted); }
.specs dd { margin: 0; }
.faq { margin: 0; border-top: 1px solid var(--line); }
.faq > div { padding: 16px 0; border-bottom: 1px solid var(--line); }
.faq dt { font-weight: 600; margin-bottom: 4px; }
.faq dd { margin: 0; color: var(--muted); }
.faq dd a { color: var(--accent); }
.lang-block { margin-top: 48px; padding-top: 32px; border-top: 1px dashed var(--line-strong); }
.lang-block h2 { font-size: 22px !important; }
.product .sec.devlog p, .product .sec.devlog li { font-size: 15px; }
.product .sec.devlog h2 { font-size: 22px; }
.product .note { color: var(--muted); }
.product .note a { color: var(--accent); }
.phead { padding: clamp(48px, 7vw, 96px) 0 clamp(32px, 4vw, 56px); border-bottom: 1px solid var(--line); }
.phead-kicker { margin: 0 0 16px; font-size: 14px; color: var(--muted); }
.phead h1 { font-size: clamp(40px, 6vw, 72px); font-weight: 800; line-height: 1.1; }
.phead-sub { margin: 16px 0 0; font-size: 17px; color: var(--muted); }
.product .table-wrap table { min-width: 560px; }
.product .lang-block h3 { font-size: 18px; margin: 1.6em 0 .5em; }
.pfoot { border-top: 1px solid var(--line); padding: 32px 0 36px; font-size: 14px; line-height: 1.8; color: var(--muted); }
.pfoot-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 32px; }
.pfoot-name { margin: 0; font-family: var(--rounded); font-weight: 700; font-size: 15px; color: var(--text); }
.pfoot-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 24px; }
.pfoot-links a { color: var(--text); }
.pfoot-links a:hover, .pfoot-links a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: .22em; }
.pfoot-maker { display: inline-flex; align-items: center; gap: 10px; margin-left: auto; font-weight: 600; color: var(--text); }
.pfoot-maker:hover span { text-decoration: underline; text-underline-offset: .22em; }
.pfoot-meta { margin: 0; flex-basis: 100%; font-size: 13px; }

/* ------------------------------------------------------------ 动效初态（只在有 JS 且不是终态时） */
.js:not(.final) .hero-title .ln > span { transform: translateY(108%); }
.js:not(.final) .hero .fade { opacity: 0; transform: translateY(16px); }
.js:not(.final) .slab { transform: scaleY(.0001); }
.js:not(.final) .hero .portrait { opacity: 0; transform: translateY(40px); }
.ready .hero-title .ln > span { transform: none !important; transition: transform 1.1s var(--ease); }
.ready .hero-title .ln:nth-child(2) > span { transition-delay: .09s; }
.ready .hero-title .ln:nth-child(3) > span { transition-delay: .18s; }
.ready .hero .fade { opacity: 1 !important; transform: none !important; transition: opacity .9s var(--ease) .45s, transform .9s var(--ease) .45s; }
.ready .hero .fade.f2 { transition-delay: .58s; }
.ready .hero .slab { transform: scaleY(var(--rise, 1)) !important; transition: transform 1.3s var(--ease) .1s; }
.ready.scrolling .hero .slab { transition: none; }
.ready .hero .portrait { opacity: 1 !important; transform: none !important; transition: opacity 1s var(--ease) .35s, transform 1.2s var(--ease) .35s; }
.js:not(.final) .page-portrait .slab { transform: none; }
.js:not(.final) [data-r], .js:not(.final) .reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js:not(.final) [data-r].in, .js:not(.final) .reveal.in { opacity: 1; transform: none; }
/* 未点亮的卡片：沉默的灰 */
.js:not(.final) .card:not(.lit) { background: #EFEFEC; color: #A3A5B6; box-shadow: none; }
.js:not(.final) .card:not(.lit) .metric, .js:not(.final) .card:not(.lit) .say, .js:not(.final) .card:not(.lit) .more { color: #A3A5B6; }
.js:not(.final) .card:not(.lit) .chip { background: rgba(16, 18, 46, .05); color: #A3A5B6; }
.js:not(.final) .card:not(.lit) .gauge { transform: scaleX(0); }
.js:not(.final) .card:not(.lit) .apps img { filter: grayscale(1); opacity: .5; }
.js:not(.final) .end .pair .arrow i { transform: scaleX(0); transition: transform 1.6s var(--ease) .3s; }
.js:not(.final) .end.in .pair .arrow i { transform: none; }

/* ------------------------------------------------------------ 响应式 */
/* 左标题右正文（topic、privacy）：正文列约 810px，桌面字号 18px，每行约 45 字 */
@media (min-width: 1101px) {
  .sec-row .container > p:not([class]), .sec-row .container > ul:not([class]) > li,
  .sec-row .container > ol:not([class]) > li, .sec-row .table-wrap td { font-size: 18px; }
}
@media (max-width: 1100px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards > .card { grid-column: span 1; min-height: 440px; }
  .cards > .card.c3, .cards > .card.wide { grid-column: span 2; min-height: 0; }
  .nav a.l { display: none; }
  .menu { display: block; }
  .nav { gap: 10px; }
  .stats-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .heat { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qcard-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sec-row > .container { grid-template-columns: minmax(0, 3fr) minmax(0, 8fr); gap: 20px 40px; }
}
@media (max-width: 960px) {
  .phero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 300px); gap: 32px 40px; }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flagship { grid-template-columns: minmax(0, 1fr); }
  .appcards { grid-template-columns: minmax(0, 1fr); max-width: 560px; }
}
@media (max-width: 860px) {
  .brand .sub { display: none; }
  .slab-ghost { height: 62%; }
  .dbr { display: none; }
  .gw { writing-mode: vertical-rl; font-size: min(27vh, 44vw); }
  .gw .l1 { top: 6vh; right: -3vw; left: auto; }
  .gw .l2 { left: -5vw; right: auto; bottom: -2vh; }
  .hero > .wrap { display: flex; flex-direction: column; align-items: stretch; }
  .hero-copy { padding: 26px 0 0; }
  .eyebrow { font-size: 13px; margin-bottom: 18px; letter-spacing: .06em; }
  .hero-title { font-size: min(11.2vw, 64px); }
  .lede { margin-top: 18px; font-size: 15.5px; line-height: 1.75; }
  .cta { margin-top: 22px; gap: 10px; flex-wrap: nowrap; }
  .btn { height: 50px; padding: 0 20px; font-size: 16px; }
  .hero-art { position: relative; top: auto; right: auto; width: auto; max-width: none; flex: 1; min-height: 330px; margin: 22px 0 0; }
  .slab { height: 62%; }
  .portrait { height: 100%; max-height: 520px; left: 0; right: 0; margin: 0 auto; }
  .scroll-cue { display: none; }
  .four { padding: 76px 0; }
  .sec-head { grid-template-columns: 1fr; gap: 16px; margin-bottom: 30px; }
  .sec-head > p { justify-self: start; font-size: 15.5px; }
  .grow { padding: 80px 0; }
  .layout-home .grow { padding: 80px 0 20px; }
  .grow-in { grid-template-columns: 1fr; gap: 34px; }
  .grow-side { position: relative; top: auto; }
  .web { --gw: 52px; }
  .end { padding-top: 64px; }
  .end h2 { font-size: min(19vw, 120px); line-height: 1.04; }
  .end h2 em { display: block; }
  .end-row { grid-template-columns: 1fr; gap: 28px; padding-bottom: 64px; }
  .end .btn { justify-self: start; }
  .page-head.has-aside .page-head-grid { grid-template-columns: minmax(0, 1fr); }
  .page-portrait { justify-self: start; max-width: 260px; order: -1; }
  .sec-row > .container { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .sec-row > .container > h2, .sec-row > .container > :not(h2) { grid-column: 1; position: static; }
  .next-q { max-width: none; }
}
@media (max-width: 719px) {
  .phero { padding: 28px 0 48px; }
  .phero-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .phero-icon { width: 76px; height: 76px; margin-bottom: 20px; }
  .phero-name { font-size: clamp(44px, 13vw, 56px); }
  .phero-tagline { margin-top: 16px; font-size: 17px; }
  .phero-actions { margin-top: 24px; }
  .phero-visual { max-width: 240px; }
  .product .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; }
  .features { grid-template-columns: minmax(0, 1fr); }
  .specs > div { grid-template-columns: minmax(0, 1fr); }
  .pbar-en, .pbar-fam { display: none; }
  .pfoot-maker { margin-left: 0; }
  .note-item { grid-template-columns: minmax(0, 1fr); gap: 4px; padding: 22px 0; }
  .timeline li { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager-next { grid-column: 1; text-align: left; }
  .prose { font-size: 17px; }
  .sec p, .sec li { font-size: 16px; }
  .stats { padding: 22px 20px 20px; }
  .stats-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps > li { grid-template-columns: 56px minmax(0, 1fr); }
  .steps-n { font-size: 34px; }
  .heat { grid-template-columns: minmax(0, 1fr); }
  .qcard-list { grid-template-columns: minmax(0, 1fr); }
  .hcard { min-height: 0; }
  .heat > li { min-height: 0; }
  .foot-top, .foot-bottom { flex-direction: column; align-items: flex-start; }
  .note-cta { padding: 18px; }
}
@media (max-width: 620px) {
  .cards { grid-template-columns: 1fr; gap: 12px; }
  .cards > .card, .cards > .card.c3, .cards > .card.wide { grid-column: auto; min-height: 0; }
  .card .split { display: block; margin-top: 22px; }
  .card .split h3 { margin-top: 16px; }
  .card { min-height: 0; }
  .card-a { padding: 22px 20px 20px; }
  .card .metric { margin-top: 22px; min-height: 0; }
  .card .metric.words { flex-direction: row; flex-wrap: wrap; justify-content: flex-start; gap: 0 .5em; }
  .card .metric .num { font-size: 72px; }
  .card h3 { font-size: 24px; margin-top: 16px; }
  .nav { gap: 8px; }
  .brand { gap: 10px; }
  .hcard .metric.words { flex-direction: row; flex-wrap: wrap; gap: 0 .5em; }
  .hcard .metric.words span { font-size: 32px; }
  .page-head h1 { margin-top: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .scroll-cue i::after, .node.seed .dot::after, .ring-prog { animation: none; }
  .card, .appcard { transition: none; }
}