/* ================================================================
   途页官网 · 明亮画廊 / 影像留白
   纯 CSS，无外部字体与依赖；系统衬线栈保证字体商用零风险
   ================================================================ */
:root {
  --paper: #F7F5F1;
  --paper-2: #F0EDE7;
  --white: #FFFFFF;
  --ink: #1C1B18;
  --ink-2: #48453F;
  --muted: #857F74;
  --line: rgba(28, 27, 24, .14);
  --line-soft: rgba(28, 27, 24, .075);
  --accent: #9A6B48;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --num: Georgia, "Times New Roman", serif;
  --shell: min(1360px, calc(100% - clamp(40px, 9vw, 160px)));
  --header-h: 76px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
[hidden] { display: none !important; }
::selection { background: #DED3C4; color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.shell { width: var(--shell); margin-inline: auto; }
section[id] { scroll-margin-top: calc(var(--header-h) + 12px); }

.skip-link {
  position: fixed; top: -60px; left: 16px; z-index: 999;
  padding: 10px 16px; background: var(--ink); color: #fff; transition: top .2s;
}
.skip-link:focus { top: 12px; }

/* ---------- 通用排版 ---------- */
.eyebrow, .sec-index {
  font-size: 11px; letter-spacing: .3em; color: var(--muted);
  display: flex; align-items: center; gap: 14px; margin: 0 0 32px;
}
.sec-index { font-family: var(--num); letter-spacing: .22em; display: block; }
.rule { display: inline-block; width: 42px; height: 1px; background: var(--accent); flex: none; }
.sec-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(38px, 5vw, 72px); line-height: 1.22; letter-spacing: -.01em; margin: 0;
}
.sec-desc { max-width: 34ch; color: var(--ink-2); font-size: 15px; line-height: 2; margin: 0; }
.muted { color: var(--muted); }
em { font-style: normal; color: var(--accent); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 14px;
  border: 1px solid transparent; border-radius: 0; padding: 15px 26px;
  font-size: 13px; letter-spacing: .12em; white-space: nowrap;
  transition: background .3s, color .3s, border-color .3s, transform .3s;
}
.btn-solid { background: var(--ink); color: #fff; }
.btn-solid:hover { background: var(--accent); transform: translateY(-2px); }
.btn-outline { border-color: var(--line); background: transparent; color: var(--ink); }
.btn-outline:hover { border-color: var(--ink); background: var(--ink); color: #fff; }
.btn-sm { padding: 10px 20px; font-size: 12px; }
.btn-text {
  background: transparent; padding-inline: 0; padding-bottom: 6px;
  border-bottom: 1px solid var(--line); color: var(--ink);
}
.btn-text:hover { border-color: var(--ink); }
.arrow { font-family: var(--num); font-size: 15px; transition: transform .3s; }
.btn:hover .arrow { transform: translate(3px, -3px); }
.btn-text:hover .arrow { transform: translateY(3px); }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .4s, border-color .4s;
}
.site-header.is-scrolled {
  background: rgba(247, 245, 241, .88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line-soft);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.wordmark { display: flex; align-items: baseline; gap: 12px; flex: none; }
.wordmark-cn { font-family: var(--serif); font-size: 26px; letter-spacing: .14em; font-weight: 600; }
.wordmark-sub { font-size: 11px; letter-spacing: .28em; color: var(--muted); border-left: 1px solid var(--line); padding-left: 12px; }
.nav { display: flex; gap: clamp(20px, 3vw, 44px); align-items: center; margin-left: auto; }
.nav a { font-size: 13px; letter-spacing: .16em; color: var(--ink-2); position: relative; padding: 6px 0; }
.nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--accent); transition: right .35s;
}
.nav a:hover::after, .nav a:focus-visible::after { right: 0; }
.header-actions { display: flex; align-items: center; gap: 12px; flex: none; }
.nav-toggle { display: none; width: 40px; height: 40px; border: 1px solid var(--line); background: transparent; position: relative; }
.nav-toggle span { position: absolute; left: 11px; right: 11px; height: 1px; background: var(--ink); transition: transform .3s, top .3s; }
.nav-toggle span:first-child { top: 16px; }
.nav-toggle span:last-child { top: 23px; }
.nav-toggle[aria-expanded="true"] span:first-child { top: 19px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { top: 19px; transform: rotate(-45deg); }

/* ---------- 图片位 / 画廊占位 ---------- */
.media-slot {
  position: relative; overflow: hidden;
  background: linear-gradient(145deg, #EEEAE2 0%, #E6E1D8 55%, #F1EEE8 100%);
  border: 1px solid var(--line-soft);
  display: flex; align-items: center; justify-content: center;
}
.media-slot::before {
  content: ""; position: absolute; inset: 14px;
  border: 1px solid rgba(28, 27, 24, .07); pointer-events: none; z-index: 2;
}
.media-slot-inner {
  position: relative; display: flex; flex-direction: column; align-items: center;
  gap: 12px; color: var(--muted); text-align: center; padding: 24px;
}
.slot-cross { width: 34px; height: 34px; position: relative; opacity: .5; }
.slot-cross::before, .slot-cross::after { content: ""; position: absolute; background: var(--muted); }
.slot-cross::before { left: 50%; top: 0; bottom: 0; width: 1px; }
.slot-cross::after { top: 50%; left: 0; right: 0; height: 1px; }
.slot-label { font-family: var(--serif); font-size: 14px; letter-spacing: .3em; text-indent: .3em; }
.slot-hint { font-size: 10px; letter-spacing: .2em; opacity: .8; }
.media-slot img {
  width: 100%; height: 100%; object-fit: cover; position: relative; z-index: 1;
  transition: transform 1.2s cubic-bezier(.2, .7, .2, 1);
}
.media-slot.is-filled { border-color: transparent; background: none; }
.media-slot.is-filled::before { display: none; }
.hero-visual-frame:hover .media-slot img, .work-media:hover .media-slot img { transform: scale(1.045); }
.hero-visual-frame .media-slot { aspect-ratio: 3 / 2; }
.work-media .media-slot { aspect-ratio: 4 / 5; }

/* ---------- Hero ---------- */
.hero { padding-top: var(--header-h); position: relative; overflow: hidden; }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  gap: clamp(36px, 6vw, 100px); align-items: center;
  min-height: calc(100vh - var(--header-h) - 62px);
  min-height: calc(100dvh - var(--header-h) - 62px);
  padding-block: clamp(50px, 7vh, 90px);
}
.hero-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(46px, 6.1vw, 98px); line-height: 1.16;
  letter-spacing: -.025em; margin: 0 0 34px;
}
.hero-title > span { display: block; }
.hero-lede { max-width: 30em; color: var(--ink-2); font-size: clamp(15px, 1.2vw, 17px); line-height: 2.1; margin: 0 0 42px; }
.hero-cta { display: flex; align-items: center; gap: 34px; flex-wrap: wrap; }
.hero-meta { display: flex; margin-top: clamp(48px, 7vh, 88px); border-top: 1px solid var(--line); padding-top: 22px; }
.hero-meta > div {
  display: flex; align-items: baseline; gap: 9px;
  padding-right: clamp(20px, 3vw, 48px); margin-right: clamp(20px, 3vw, 48px);
  border-right: 1px solid var(--line-soft);
}
.hero-meta > div:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.hero-meta strong { font-family: var(--num); font-size: 28px; font-weight: 400; }
.hero-meta span { font-size: 11px; letter-spacing: .16em; color: var(--muted); }
.hero-visual { margin: 0; }
.hero-visual-frame { overflow: hidden; }
.hero-visual figcaption {
  display: flex; justify-content: space-between; margin-top: 14px;
  font-size: 10px; letter-spacing: .22em; color: var(--muted);
}
.hero-foot {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--line-soft); padding-block: 18px 20px;
  font-size: 11px; letter-spacing: .2em; color: var(--muted);
}
.scroll-cue { display: inline-flex; gap: 12px; align-items: center; color: var(--ink-2); }
.scroll-cue span { animation: bob 2.2s ease-in-out infinite; display: inline-block; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(5px); } }

/* ---------- 品牌陈述 ---------- */
.statement { padding-block: clamp(100px, 14vw, 190px); border-top: 1px solid var(--line-soft); background: var(--paper-2); }
.statement-grid {
  display: grid; grid-template-columns: minmax(140px, .6fr) minmax(0, 2fr) minmax(0, 1fr);
  gap: clamp(30px, 5vw, 80px); align-items: start;
}
.statement .sec-index { margin-top: 12px; }
.statement-title { font-family: var(--serif); font-weight: 400; font-size: clamp(34px, 4.6vw, 68px); line-height: 1.32; letter-spacing: -.01em; margin: 0; }
.statement-note { padding-top: 10px; font-size: 14px; line-height: 2.1; color: var(--ink-2); }
.statement-note p { margin: 0 0 18px; }

/* ---------- 产品矩阵 ---------- */
.products, .download { padding-block: clamp(90px, 12vw, 170px); }
.sec-head { margin-bottom: clamp(60px, 8vw, 120px); }
.sec-head-row { display: flex; justify-content: space-between; align-items: flex-end; gap: 60px; flex-wrap: wrap; }
.works { border-top: 1px solid var(--line); }
.work {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(40px, 7vw, 120px); align-items: center;
  padding-block: clamp(64px, 8vw, 120px); border-bottom: 1px solid var(--line-soft);
}
.work--rev .work-media { order: 2; }

/* ---------- C 位主推产品：更大图幅、更大字号、强调线与徽标 ---------- */
.work--featured { position: relative; }
.work--featured::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: clamp(56px, 7vw, 96px); height: 2px; background: var(--accent);
}
@media (min-width: 861px) {
  .work--featured { grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr); gap: clamp(48px, 8vw, 140px); padding-block: clamp(84px, 11vw, 168px); }
  .work--featured .work-media .media-slot { aspect-ratio: 1 / 1; }
}
.work--featured .work-title { font-size: clamp(42px, 5.2vw, 76px); }
.work--featured .work-tagline { font-size: clamp(19px, 2vw, 26px); margin-bottom: 32px; }
.work--featured .work-desc { font-size: 16px; }
.work--featured .work-no { font-size: clamp(56px, 7vw, 104px); color: rgba(154, 107, 72, .2); }
.work-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 10px; letter-spacing: .26em; color: var(--accent);
  border: 1px solid rgba(154, 107, 72, .42); padding: 7px 14px; margin-bottom: 24px;
}
.work-badge::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.work-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 26px; }
.detail-link {
  display: inline-flex; align-items: center; gap: 16px;
  font-size: 13px; letter-spacing: .14em; color: var(--muted);
  border-bottom: 1px solid var(--line); padding-bottom: 8px;
  transition: color .3s, border-color .3s, gap .3s;
}
.detail-link:hover { color: var(--accent); border-color: var(--accent); gap: 24px; }
.detail-link span { font-family: var(--num); font-size: 15px; }

.work-media { margin: 0; position: relative; }
.work-no {
  position: absolute; left: -14px; top: -28px; font-family: var(--num);
  font-size: clamp(40px, 5vw, 72px); color: rgba(28, 27, 24, .09);
  line-height: 1; z-index: 3; pointer-events: none;
}
.work--rev .work-no { left: auto; right: -14px; }
.work-kind { display: flex; align-items: center; gap: 10px; font-size: 11px; letter-spacing: .24em; color: var(--muted); margin: 0 0 26px; }
.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); flex: none; }
.work-title { font-family: var(--serif); font-weight: 400; font-size: clamp(34px, 4vw, 58px); line-height: 1.2; margin: 0 0 10px; }
.work-tagline { font-family: var(--serif); font-size: clamp(17px, 1.6vw, 22px); color: var(--accent); margin: 0 0 28px; letter-spacing: .04em; }
.work-desc { color: var(--ink-2); font-size: 15px; line-height: 2.1; max-width: 38em; margin: 0 0 30px; }
.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0 0 40px; }
.tag-list li { font-size: 11px; letter-spacing: .14em; color: var(--muted); border: 1px solid var(--line); padding: 7px 14px; }
.link-arrow {
  background: none; border: 0; border-bottom: 1px solid var(--ink); padding: 0 0 8px;
  font-size: 13px; letter-spacing: .14em; display: inline-flex; gap: 28px; align-items: center;
  transition: gap .3s, color .3s;
}
.link-arrow:hover { gap: 38px; color: var(--accent); }
.link-arrow span { font-family: var(--num); font-size: 16px; }

/* ---------- 小程序引导 ---------- */
.miniapp { background: var(--ink); color: #F3EFE8; padding-block: clamp(90px, 12vw, 160px); }
.miniapp .sec-index { color: rgba(243, 239, 232, .5); }
.miniapp .sec-title { color: #F7F3EC; }
.miniapp .sec-desc { color: rgba(243, 239, 232, .62); margin-top: 24px; }
.miniapp-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .72fr); gap: clamp(50px, 8vw, 130px); align-items: center; }
.steps { list-style: none; margin: 56px 0 0; padding: 0; border-top: 1px solid rgba(243, 239, 232, .16); }
.steps li { display: flex; gap: 26px; padding: 20px 0; border-bottom: 1px solid rgba(243, 239, 232, .16); }
.step-no { font-family: var(--num); font-size: 13px; color: rgba(243, 239, 232, .45); padding-top: 3px; flex: none; }
.steps strong { display: block; font-weight: 500; font-size: 15px; letter-spacing: .06em; }
.steps div span { display: block; font-size: 12px; color: rgba(243, 239, 232, .55); margin-top: 4px; line-height: 1.8; }
.qr-card { background: #FBF9F5; color: var(--ink); padding: clamp(28px, 3vw, 44px); }
.qr-card-top { display: flex; justify-content: space-between; font-size: 11px; letter-spacing: .24em; color: var(--muted); border-bottom: 1px solid var(--line-soft); padding-bottom: 18px; }
.qr-slot { display: flex; justify-content: center; padding: clamp(28px, 4vw, 48px) 0; }
.qr-placeholder {
  position: relative; width: min(100%, 260px); aspect-ratio: 1;
  background: var(--paper-2); border: 1px solid var(--line);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
}
.qr-corner { position: absolute; width: 18px; height: 18px; border: 2px solid var(--accent); }
.qr-corner--tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.qr-corner--tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.qr-corner--bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.qr-corner--br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.qr-ph-mark { font-family: var(--serif); font-size: 30px; letter-spacing: .18em; text-indent: .18em; }
.qr-ph-label { font-size: 11px; letter-spacing: .24em; color: var(--ink-2); }
.qr-ph-note { font-size: 10px; letter-spacing: .1em; color: var(--muted); }
.qr-card-foot { text-align: center; font-size: 11px; letter-spacing: .14em; color: var(--muted); margin: 0; }
.qr-slot img { width: min(100%, 280px); height: auto; aspect-ratio: 1; object-fit: contain; }

/* ---------- 下载 ---------- */
.dl-panel { border: 1px solid var(--line); background: var(--white); }
.dl-tabs { display: flex; border-bottom: 1px solid var(--line); overflow-x: auto; }
.dl-tab {
  flex: 1; min-width: 160px; background: none; border: 0; border-right: 1px solid var(--line-soft);
  padding: 22px 18px; font-size: 14px; letter-spacing: .08em; color: var(--muted);
  transition: background .3s, color .3s; white-space: nowrap; text-align: left;
}
.dl-tab:last-child { border-right: 0; }
.dl-tab small { display: block; font-size: 10px; letter-spacing: .16em; margin-top: 5px; opacity: .75; }
.dl-tab.is-active { background: var(--ink); color: #fff; }
.dl-list { list-style: none; margin: 0; padding: 0; }
.dl-row {
  display: grid; grid-template-columns: 60px minmax(0, 1.4fr) minmax(0, 1fr) auto;
  gap: 24px; align-items: center; padding: 28px clamp(20px, 3vw, 40px);
  border-bottom: 1px solid var(--line-soft); transition: background .4s;
}
.dl-row:last-child { border-bottom: 0; }
.dl-row.is-highlight { background: #F5F1E9; }
.dl-idx { font-family: var(--num); font-size: 13px; color: var(--muted); }
.dl-name strong { display: block; font-family: var(--serif); font-size: 24px; font-weight: 400; }
.dl-name span { font-size: 11px; letter-spacing: .12em; color: var(--muted); }
.dl-meta { font-size: 11px; letter-spacing: .1em; color: var(--muted); line-height: 1.9; }
.dl-btn { min-width: 150px; }
.dl-note { margin: 0; padding: 18px clamp(20px, 3vw, 40px); border-top: 1px solid var(--line-soft); font-size: 12px; color: var(--muted); letter-spacing: .04em; }
.dl-note a { border-bottom: 1px solid var(--line); padding-bottom: 2px; }
.dl-note a:hover { color: var(--ink); border-color: var(--ink); }

/* ---------- 收束 ---------- */
.closing { background: var(--paper-2); border-top: 1px solid var(--line-soft); padding-block: clamp(110px, 16vw, 220px); text-align: center; }
.closing-title { font-family: var(--serif); font-weight: 400; font-size: clamp(48px, 8vw, 120px); line-height: 1.2; letter-spacing: -.02em; margin: 0 0 26px; }
.closing-note { font-size: 13px; letter-spacing: .28em; color: var(--muted); margin: 0 0 54px; }
.closing-cta { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--ink); color: rgba(243, 239, 232, .72); padding-block: 64px 28px; }
.foot-top { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); gap: 50px; padding-bottom: 56px; }
.foot-brand .wordmark-cn { color: #F7F3EC; font-size: 30px; }
.foot-brand p { margin: 14px 0 0; font-size: 12px; letter-spacing: .16em; color: rgba(243, 239, 232, .45); }
.foot-nav { display: flex; flex-direction: column; gap: 12px; font-size: 13px; letter-spacing: .1em; }
.foot-nav a:hover { color: #fff; }
.foot-contact p { font-size: 11px; letter-spacing: .22em; color: rgba(243, 239, 232, .45); margin: 0 0 12px; }
.foot-contact a { display: block; width: fit-content; font-size: 14px; border-bottom: 1px solid rgba(243, 239, 232, .3); padding-bottom: 4px; margin-bottom: 10px; }
/* 备案号须位于主页底部中央（《非经营性互联网信息服务备案管理办法》第 13 条）：
   故改为纵向居中，不再用 space-between 把备案号挤到右侧。 */
.foot-bottom { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 10px; border-top: 1px solid rgba(243, 239, 232, .14); padding-top: 24px; font-size: 11px; letter-spacing: .12em; color: rgba(243, 239, 232, .4); }
.foot-bottom p { margin: 0; }
.foot-bottom a { border-bottom: 1px solid rgba(243, 239, 232, .3); padding-bottom: 2px; }
.foot-bottom a:hover { color: #fff; border-color: #fff; }
/* 备案号辨识度：法规要求「标明」，沿用 .4 的低透明度会在深色底上显得像装饰文字，
   故单独提到 .78 并放开字距，确保一眼可读、可辨认全串编号。 */
.foot-bottom [data-icp] { color: rgba(243, 239, 232, .78); border-bottom-color: rgba(243, 239, 232, .55); letter-spacing: .06em; }
.foot-bottom [data-icp]:hover { color: #fff; border-bottom-color: #fff; }

/* ---------- 小程序码弹层 / 提示 ---------- */
.qr-dialog { border: 0; padding: 0; background: #FBF9F5; color: var(--ink); width: min(420px, calc(100% - 32px)); max-width: none; box-shadow: 0 30px 90px rgba(0, 0, 0, .25); }
.qr-dialog::backdrop { background: rgba(28, 27, 24, .5); backdrop-filter: blur(5px); }
.qr-dialog-inner { padding: clamp(28px, 4vw, 44px); text-align: center; position: relative; }
.qr-dialog .sec-index { margin-bottom: 14px; }
.qr-dialog h2 { font-family: var(--serif); font-weight: 400; font-size: 30px; margin: 0 0 8px; }
.qr-dialog-hint { font-size: 12px; color: var(--muted); margin: 0; letter-spacing: .08em; }
.qr-close { position: absolute; top: 12px; right: 16px; background: none; border: 0; font-size: 28px; line-height: 1; color: var(--muted); }
.qr-close:hover { color: var(--ink); }
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translate(-50%, 20px);
  background: var(--ink); color: #fff; padding: 13px 22px; font-size: 13px; letter-spacing: .08em;
  opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s; z-index: 200;
  max-width: calc(100% - 32px); text-align: center;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 滚动揭示（无 JS 时全部可见） ---------- */
html.has-js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .85s cubic-bezier(.2, .7, .2, 1), transform .85s cubic-bezier(.2, .7, .2, 1); }
html.has-js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .hero-grid { gap: 40px; }
  .statement-grid { grid-template-columns: 1fr 1fr; }
  .statement .sec-index { grid-column: 1 / -1; margin: 0; }
  .dl-row { grid-template-columns: 44px minmax(0, 1fr) auto; }
  .dl-meta { grid-column: 2; grid-row: 2; }
}
@media (max-width: 860px) {
  :root { --header-h: 66px; }
  .nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 16px 24px 24px; display: none; box-shadow: 0 20px 40px rgba(28, 27, 24, .08);
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--line-soft); font-size: 14px; }
  .nav-toggle { display: block; }
  .hero-grid { grid-template-columns: 1fr; min-height: 0; padding-block: 56px 40px; }
  .hero-title { font-size: clamp(42px, 9vw, 68px); }
  .hero-visual-frame .media-slot { aspect-ratio: 4 / 3; }
  .hero-meta { margin-top: 40px; }
  .statement-grid { grid-template-columns: 1fr; gap: 24px; }
  .sec-head-row { gap: 24px; }
  .work, .work--rev { grid-template-columns: 1fr; gap: 36px; }
  .work--rev .work-media { order: 0; }
  .work-media .media-slot { aspect-ratio: 4 / 3; }
  .work-no { left: 8px; top: -20px; }
  .work--rev .work-no { right: auto; left: 8px; }
  .miniapp-grid { grid-template-columns: 1fr; gap: 56px; }
  .dl-row { grid-template-columns: 36px minmax(0, 1fr); gap: 10px 16px; padding: 22px 20px; }
  .dl-meta { grid-column: 2; grid-row: 2; }
  .dl-btn { grid-column: 1 / -1; margin-top: 8px; width: 100%; }
  .dl-tab { min-width: 132px; padding: 16px 12px; font-size: 12px; }
  .foot-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .hero-foot { font-size: 10px; }
}
@media (max-width: 520px) {
  .wordmark-sub { display: none; }
  .hero-cta { gap: 20px; }
  .hero-cta .btn { width: 100%; }
  .foot-top { grid-template-columns: 1fr; }
  .hero-meta > div { padding-right: 16px; margin-right: 16px; }
  .hero-meta strong { font-size: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html.has-js .reveal { opacity: 1; transform: none; }
}