/* Hey Tuling · 拍摄台 (sample A)
   深色棚拍：物件图是画面里唯一的光。香蕉黄只给可操作的东西。 */

@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('fonts/noto-latin-400.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('fonts/noto-latin-500.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('fonts/noto-latin-700.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('fonts/noto-chinese-simplified-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('fonts/noto-chinese-simplified-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Noto Sans SC'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('fonts/noto-chinese-simplified-700.woff2') format('woff2');
}

:root {
  --stage: #0B1410;
  --stage-soft: #101C16;
  --ink: #F4F2EA;
  --muted: rgba(244, 242, 234, .56);
  --faint: rgba(244, 242, 234, .34);
  --line: rgba(244, 242, 234, .14);
  --line-soft: rgba(244, 242, 234, .08);
  --banana: #FFE500;
  --paper-light: #F3EFE4;
  --font-display: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', 'MiSans', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'HarmonyOS Sans SC', 'MiSans', 'Microsoft YaHei', sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --ease: cubic-bezier(.16, 1, .3, 1);
  /* 字号阶梯：全站只用这 5 档正文尺寸 + 3 档标题 */
  --fs-xs: 12px;      /* 说明、标签、meta */
  --fs-s: 13.5px;     /* 次要正文 */
  --fs-m: 15px;       /* 正文 */
  --fs-l: 17px;       /* 小标题 */
  --fs-2xl: clamp(30px, 3.6vw, 42px);
  --fs-xl: clamp(26px, 3.2vw, 38px);
  --fs-hero: clamp(42px, 5.9vw, 84px);
  --section-y: clamp(64px, 9vh, 120px);
  --r-surface: 14px;
  --r-chip: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; color-scheme: dark; overflow-x: clip; }
body {
  background: var(--stage); color: var(--ink);
  font-family: var(--font-body); font-size: 16px; line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--banana); color: #0B1410; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--banana); outline-offset: 3px; }

/* ── 顶栏 ── */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(11, 20, 16, .86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.topbar-in {
  max-width: 1180px; margin: 0 auto; height: 68px;
  padding: 0 clamp(20px, 4vw, 40px);
  display: flex; align-items: center; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; white-space: nowrap; }
.brand-logo { width: 30px; height: 30px; border-radius: 6px; display: block; }
.brand-tuling { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-l); letter-spacing: -.02em; }
.brand-cn { color: var(--faint); font-size: var(--fs-xs); letter-spacing: .12em; margin-left: 2px; }

.nav { display: flex; gap: 28px; margin-left: 8px; }
.nav a {
  color: var(--muted); text-decoration: none; font-size: var(--fs-s);
  height: 68px; display: inline-flex; align-items: center;
  border-bottom: 1px solid transparent; transition: color .18s, border-color .18s;
}
.nav a:hover { color: var(--ink); border-bottom-color: var(--line); }

.topbar-cta { margin-left: auto; display: flex; align-items: center; gap: 20px; }
.link-quiet { color: var(--muted); text-decoration: none; font-size: var(--fs-s); }
.link-quiet:hover { color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-size: var(--fs-s); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; border-radius: 6px;
  padding: 0 20px; height: 42px;
  transition: background .18s, color .18s, border-color .18s, transform .18s var(--ease);
}
.btn-primary { background: var(--banana); color: #0B1410; font-weight: 700; }
.btn-primary:hover { background: #FFEF5C; transform: translateY(-1px); }
.btn-quiet { border-color: var(--line); color: var(--ink); }
.btn-quiet:hover { border-color: rgba(244, 242, 234, .3); background: rgba(244, 242, 234, .04); }
.btn-lg { height: 50px; padding: 0 26px; font-size: var(--fs-m); }
.topbar .btn { height: 38px; font-size: var(--fs-s); padding: 0 16px; }

/* ── 版心 ── */
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 clamp(20px, 4vw, 40px); }

/* ── 首屏 ── */
.hero {
  display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 76px); align-items: center;
  padding: clamp(28px, 4.5vh, 56px) 0 clamp(48px, 7vh, 84px);
}
.hero-copy { max-width: 30em; }
.hero-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: var(--fs-hero); line-height: 1.02; letter-spacing: -.05em;
}
.hero-title em { font-style: normal; color: var(--banana); }
.hero-sub {
  margin-top: 26px; font-size: var(--fs-m); line-height: 1.85;
  color: var(--muted); max-width: 27em;
}
.hero-cta { display: flex; align-items: center; gap: 22px; margin-top: 36px; flex-wrap: wrap; }
.link-arrow {
  text-decoration: none; color: var(--ink); font-size: var(--fs-m);
  border-bottom: 1px solid var(--line); padding-bottom: 3px;
  transition: border-color .18s, color .18s;
}
.link-arrow:hover { border-bottom-color: var(--banana); color: var(--banana); }
.hero-trust {
  margin-top: 26px; display: flex; gap: 18px; flex-wrap: wrap;
  font-size: var(--fs-xs); color: var(--faint);
}
.hero-trust span { display: inline-flex; align-items: center; gap: 7px; }
.hero-trust span::before { content: ''; width: 3px; height: 3px; background: rgba(255, 229, 0, .8); }

/* ── 对比滑块 ── */
/* width:100% 不能省：grid 里带 margin-left:auto 的块会按内容收缩，
   说明文字一长，整个对比框就被撑宽，四个场景大小不一 */
.cmp { width: 100%; min-width: 0; max-width: 470px; margin-left: auto; }
.cmp-frame {
  position: relative; width: 100%; aspect-ratio: 1 / 1;
  background: #05080A; border: 1px solid var(--line); border-radius: var(--r-surface);
  overflow: hidden; cursor: ew-resize; touch-action: none; user-select: none;
}
.cmp-frame img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; pointer-events: none;
}
.cmp-a { clip-path: inset(0 0 0 var(--split, 100%)); }
.cmp-bar {
  position: absolute; top: 0; bottom: 0; left: var(--split, 50%);
  width: 2px; background: var(--banana); transform: translateX(-1px); pointer-events: none;
}
.cmp-handle {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--banana); color: #0B1410;
  display: grid; place-items: center; font-size: 17px; font-weight: 700;
}
.cmp-handle svg { width: 19px; height: 19px; display: block; }
.cmp-tag {
  position: absolute; top: 14px; padding: 4px 10px; border-radius: 999px;
  font-size: var(--fs-xs); 
  background: rgba(11, 20, 16, .72); color: var(--ink);
  border: 1px solid var(--line); pointer-events: none;
}
.tag-l { left: 14px; }
.tag-r { right: 14px; background: var(--banana); color: #0B1410; border-color: var(--banana); font-weight: 600; }

.cmp-controls {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  margin-top: 18px; border-bottom: 1px solid var(--line-soft);
}
.cmp-tabs { display: flex; gap: 26px; flex-wrap: wrap; }
.cmp-tab {
  font: inherit; font-size: var(--fs-s); cursor: pointer; color: var(--muted);
  background: none; border: 0; border-bottom: 1px solid transparent;
  padding: 4px 0 9px; margin-bottom: -1px; transition: color .18s, border-color .18s;
}
.cmp-tab:hover { color: var(--ink); }
.cmp-tab.on { color: var(--ink); border-bottom-color: var(--banana); }

.cmp-dots { display: flex; gap: 6px; flex: none; padding-bottom: 9px; }
.cmp-dot { width: 14px; height: 2px; padding: 0; border: 0; background: var(--line); cursor: pointer; }
.cmp-dot.on { background: var(--banana); }

/* 说明文字固定占两行的高度：切场景时长短不一，不固定会把整栏撑高，
   首屏是垂直居中，一撑高左右两栏就整体跳位 */
.cmp-cap { margin-top: 14px; font-size: var(--fs-s); color: var(--muted); min-height: 3.6em; }
.cmp-cap b { color: var(--ink); font-weight: 500; margin-right: 8px; }

/* ── 流水线 ── */
.flow { border-top: 1px solid var(--line-soft); padding: var(--section-y) 0; }
.flow-head { display: flex; align-items: baseline; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.flow-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: var(--fs-xl); letter-spacing: -.035em; line-height: 1.2;
}
.flow-note { font-size: var(--fs-xs); color: var(--faint);  }

.flow-strip {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(118px, 1fr);
  gap: 12px; margin-top: 34px; overflow-x: auto; padding-bottom: 6px;
  scrollbar-width: none; -ms-overflow-style: none;
}
.flow-strip::-webkit-scrollbar { display: none; }
.flow-cta { margin-top: 28px; }
.flow-cta .link-arrow { font-size: var(--fs-m); }
.bstep { display: flex; flex-direction: column; gap: 9px; cursor: zoom-in; }
.bstep-no {
  font-size: var(--fs-xs); color: var(--faint);
  display: flex; align-items: center; gap: 8px;
}
.bstep-no::after { content: ''; flex: 1; height: 1px; background: var(--line-soft); }
/* 缩略图统一 1:1：b0–b5 本来就是正方形，contain 正好铺满；
   最后一张详情页是 480×720 竖图，两侧补白和它自己的白底连成一片，不会出现黑边 */
.bstep img {
  width: 100%; aspect-ratio: 1 / 1; object-fit: contain;
  border: 1px solid var(--line); border-radius: 8px; background: #fff;
  transition: border-color .18s;
}
.bstep:hover img { border-color: rgba(255, 229, 0, .55); }
/* 详情页是竖图，单给一个竖版比例，和方形缩略图并排时不会被压扁 */
.bstep-tall img { aspect-ratio: 2 / 3; }
.bstep { align-self: start; }
.bstep figcaption { font-size: var(--fs-xs); color: var(--muted); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; }
  .hero-copy { max-width: none; }
  .nav { display: none; }
  .topbar-in { gap: 16px; }
  /* 手机上对比框取消靠右对齐，占满整行居中，不然整个版面往一边歪 */
  .cmp { margin-left: 0; margin-right: 0; max-width: 560px; }
}
@media (max-width: 700px) {
  /* 手机端不横向滚动：3 列网格，第 7 张（详情页）独占一行放大 */
  .flow-strip {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    overflow: visible;
  }
  .bstep-tall {
    grid-column: 1 / -1;
  }
  .bstep-tall img {
    aspect-ratio: auto;      /* 手机上让它按自身比例展开，不裁不压 */
    height: auto;
  }
  .bstep figcaption { font-size: var(--fs-xs); }
}
@media (max-width: 560px) {
  .hero-title { letter-spacing: -.035em; }
  .hero-cta { gap: 16px; }
  .hero-cta .btn { flex: 1 1 auto; }
  .cmp-controls { flex-wrap: wrap; gap: 8px; }
  .cmp-tabs { gap: 18px; flex-wrap: wrap; }
  .cmp-dot { width: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* 锚点避开吸顶导航 */
section[id], header[id] { scroll-margin-top: 84px; }

/* ══════════ 以下为整页新增区块 ══════════ */

/* ── 通用区块 ── */
.band { padding: var(--section-y) 0; border-top: 1px solid var(--line-soft); }
.band-head { display: flex; align-items: baseline; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.band-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: var(--fs-xl); letter-spacing: -.035em; line-height: 1.2;
}
.band-note { font-size: var(--fs-s); color: var(--faint); max-width: 34ch; }
.band-sub { margin-top: 14px; font-size: var(--fs-m); color: var(--muted); max-width: 44em; }

/* ── 三步 ── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 44px; border-top: 1px solid var(--line); }
.step { padding: 26px 30px 4px 30px; border-right: 1px solid var(--line-soft); }
.step:first-child { padding-left: 0; }
.step:last-child { border-right: 0; padding-right: 0; }
.step h3 { margin: 12px 0 10px; font-size: var(--fs-l); font-weight: 700; letter-spacing: -.01em; }
.step p { font-size: var(--fs-m); color: var(--muted); line-height: 1.85; max-width: 26em; }

/* ── 交付物规格条 ── */
.spec { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 40px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line-soft); }
.spec-item { padding: 28px 26px 28px 26px; border-right: 1px solid var(--line-soft); }
.spec-item:first-child { padding-left: 0; }
.spec-item:last-child { border-right: 0; padding-right: 0; }
.spec-item b { display: block; font-family: var(--font-display); font-size: clamp(34px, 4vw, 46px); line-height: 1; font-weight: 700; letter-spacing: -.04em; }
.spec-item span { display: block; margin-top: 12px; font-size: var(--fs-s); }
.spec-item em { display: block; margin-top: 5px; font-style: normal; font-size: var(--fs-xs); color: var(--faint);  }

/* ── 价格 ── */
.price-row { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(32px, 5vw, 64px); margin-top: 40px; }
.price-list { list-style: none; margin-top: 26px; }
.price-list li {
  display: flex; gap: 14px; align-items: baseline;
  padding: 13px 0; border-bottom: 1px solid var(--line-soft); font-size: var(--fs-m); color: var(--muted);
}
.price-list li::before { content: '—'; color: var(--banana); font-size: var(--fs-xs); }
.price-side { border-left: 1px solid var(--line-soft); padding-left: clamp(24px, 4vw, 48px); }
.price-label { font-size: var(--fs-xs); color: var(--faint); }
.price-value {
  margin-top: 10px; font-family: var(--font-display); font-weight: 700;
  font-size: clamp(30px, 3.6vw, 42px); letter-spacing: -.04em; line-height: 1.1;
}
.price-side .btn { margin-top: 24px; width: 100%; }
.price-note { margin-top: 16px; font-size: var(--fs-xs); color: var(--faint); line-height: 1.8; }

/* ── FAQ ── */
.faq-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: clamp(32px, 5vw, 64px); }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line-soft); }
.faq summary {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 18px 0; font-size: var(--fs-m); font-weight: 500; cursor: pointer; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+'; font-family: var(--mono); font-size: 16px; color: var(--faint);
  transition: color .18s, transform .2s var(--ease);
}
.faq details[open] summary::after { content: '−'; color: var(--banana); }
.faq summary:hover { color: var(--banana); }
.faq details p { padding: 0 0 20px; font-size: var(--fs-m); color: var(--muted); line-height: 1.85; max-width: 52em; }

/* ── 试用 / 微信 ── */
.apply-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: clamp(32px, 5vw, 64px); align-items: start; }
.apply-steps { list-style: none; counter-reset: s; margin: 26px 0 30px; }
.apply-steps li {
  counter-increment: s; position: relative; padding: 10px 0 10px 38px;
  font-size: var(--fs-s); color: var(--muted);
}
.apply-steps li::before {
  content: counter(s); position: absolute; left: 0; top: 9px;
  width: 22px; height: 22px; display: grid; place-items: center;
  font-size: var(--fs-xs); color: var(--banana);
  border: 1px solid rgba(255, 229, 0, .4); border-radius: 50%;
}
.apply-form { display: flex; flex-direction: column; gap: 12px; margin-top: 18px; }
.field-input {
  font: inherit; font-size: var(--fs-m); color: var(--ink);
  background: transparent; border: 1px solid var(--line); border-radius: 6px;
  padding: 12px 15px; min-height: 48px; transition: border-color .18s;
}
.field-input::placeholder { color: var(--faint); }
.field-input:focus { outline: none; border-color: var(--banana); }
.apply-msg { min-height: 22px; font-size: var(--fs-s); color: var(--muted); }
.apply-msg.ok { color: #57D98A; }
.apply-msg.err { color: #FF7A6B; }
.apply-alt { margin-top: 22px; border-top: 1px solid var(--line-soft); padding-top: 18px; }
.apply-alt summary { cursor: pointer; font-size: var(--fs-s); color: var(--muted); list-style: none; }
.apply-alt summary::-webkit-details-marker { display: none; }
.apply-alt summary::before { content: '+ '; font-family: var(--mono); color: var(--banana); }
.apply-alt[open] summary::before { content: '− '; }
.apply-alt summary:hover { color: var(--ink); }
.apply-alt-note { margin-top: 12px; font-size: var(--fs-xs); color: var(--faint); }
.apply-result { margin-top: 18px; padding: 18px; border: 1px solid var(--line); border-radius: var(--r-chip); background: var(--stage-soft); }
.apply-result-title { font-size: var(--fs-s); font-weight: 600; margin-bottom: 10px; }
.apply-code-row { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; }
.apply-code {
  flex: 1; font-family: var(--mono); font-size: 15px; letter-spacing: .06em; color: var(--banana);
  background: #07100C; border: 1px dashed rgba(255, 229, 0, .35); border-radius: var(--r-chip);
  padding: 10px 12px; word-break: break-all;
}
.apply-result-note { font-size: var(--fs-xs); color: var(--muted); margin-top: 10px; line-height: 1.7; }
.apply-result-note a, .apply-login-link { color: var(--banana); text-decoration: none; border-bottom: 1px solid rgba(255,229,0,.35); }

.qr-panel {
  border: 1px solid var(--line); border-radius: var(--r-chip); padding: 26px;
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent);
}
.qr-panel img { display: block; width: 200px; height: 200px; border-radius: 6px; background: #fff; padding: 8px; }
.qr-title { font-size: var(--fs-l); font-weight: 700; margin-bottom: 6px; }
.qr-sub { font-size: var(--fs-s); color: var(--muted); line-height: 1.8; margin-bottom: 20px; }
.qr-tip { margin-top: 16px; font-size: var(--fs-xs); color: var(--faint);  }

/* ── 页脚 ── */
.footer { border-top: 1px solid var(--line); margin-top: clamp(48px, 7vh, 80px); padding: 56px 0 28px; }
.footer-cols { display: grid; grid-template-columns: 1.15fr .85fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: start; }
.footer .brand { margin-bottom: 14px; }
.footer-tag { font-size: var(--fs-s); color: var(--muted); margin-bottom: 6px; }
.footer-contact { font-size: var(--fs-xs); color: var(--faint); }
.footer-h { margin-bottom: 14px; font-size: var(--fs-xs); letter-spacing: .14em; color: var(--faint); font-weight: 500; }
.footer-col a {
  display: block; padding: 6px 0; font-size: var(--fs-s); color: var(--muted);
  text-decoration: none; transition: color .16s, transform .22s var(--ease);
}
.footer-col a::after {
  content: '→'; margin-left: 6px; display: inline-block;
  opacity: 0; transform: translateX(-6px);
  transition: opacity .2s, transform .26s var(--ease);
}
.footer-col a:hover { color: var(--ink); transform: translateX(4px); }
.footer-col a:hover::after { opacity: 1; transform: none; }
.footer-about p { font-size: var(--fs-s); color: var(--muted); line-height: 1.9; margin-bottom: 14px; }
.letter-head {
  font: inherit; letter-spacing: .14em; color: var(--faint); background: none; border: none;
  padding: 0; cursor: pointer; font-size: var(--fs-xs); transition: color .15s;
}
.letter-head:hover { color: var(--banana); }
.letter-btn {
  font: inherit; font-size: var(--fs-s); cursor: pointer; color: var(--ink);
  background: none; border: 1px solid var(--line); border-radius: 6px; padding: 9px 16px;
  transition: border-color .18s, color .18s, transform .22s var(--ease);
}
.letter-btn:hover { border-color: var(--banana); color: var(--banana); transform: translateY(-1px); }
.footer-legal {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line-soft);
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  font-size: var(--fs-xs); color: var(--faint);
}
.footer-legal .sep { color: var(--line); }
.footer a { color: inherit; }

@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr; }
  .step { border-right: 0; border-bottom: 1px solid var(--line-soft); padding: 24px 0; }
  .step:first-child { padding-left: 0; }
  .step:last-child { border-bottom: 0; }
  .spec { grid-template-columns: 1fr 1fr; }
  .spec-item { padding: 24px 0; border-right: 0; }
  .spec-item:nth-child(2n) { padding-left: 24px; border-left: 1px solid var(--line-soft); }
  .spec-item:nth-child(-n+2) { border-bottom: 1px solid var(--line-soft); }
  .price-row, .faq-grid, .apply-grid { grid-template-columns: 1fr; }
  .price-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--line-soft); padding-top: 28px; }
  .footer-cols { grid-template-columns: 1fr; gap: 32px; }
}

/* ── 关于我 · 一封信（纸面配色在弹层内重新作用域，外面是深色舞台）── */
.letter-mask {
  --ink: #1B1813;
  --ink-60: rgba(27,24,19,.62);
  --ink-40: rgba(27,24,19,.42);
  --line: rgba(27,24,19,.14);
  --line-strong: rgba(27,24,19,.30);
  --accent: #133E31;
  position: fixed; inset: 0; z-index: 60;
  display: flex; align-items: flex-end; justify-content: center;
  padding: 24px; overflow-y: auto;
}
.letter-mask[hidden] { display: none; }
.letter-mask::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 50% 30%, rgba(4,9,7,.62), rgba(2,5,4,.9) 78%);
  backdrop-filter: blur(2px);
  animation: veilIn 320ms ease-out both;
}
.letter-mask:not([hidden]) .letter-stage { animation: stageIn .62s cubic-bezier(.16,1,.3,1) both; }
@keyframes stageIn {
  from { opacity: 0; transform: translate3d(0, 26px, 0) scale(.985); }
  to   { opacity: 1; transform: none; }
}
.letter-mask.is-closing::before { animation: veilOut 150ms ease-in 110ms both; }
@keyframes veilIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes veilOut { from { opacity: 1; } to { opacity: 0; } }

.letter-stage {
  position: relative; z-index: 1; width: 100%; max-width: 560px;
  display: flex; flex-direction: column; align-items: center;
  margin: 0 auto; padding-bottom: clamp(16px, 6vh, 72px);
}
.letter-card {
  position: relative; z-index: 1; width: calc(100% - 28px);
  margin: 0 14px;
  border: 1px solid rgba(27,24,19,.12); border-radius: 12px;
  padding: clamp(30px, 4.5vw, 46px) clamp(28px, 5vw, 48px) clamp(58px, 7vw, 74px);
  background-color: #F7F3E8;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E"),
    radial-gradient(130% 90% at 50% -12%, rgba(255,255,255,.55), rgba(255,255,255,0) 55%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.75),
    0 2px 0 2px #E9E2D0,
    0 4px 0 4px #DDD4BE,
    0 26px 60px -12px rgba(0,0,0,.7),
    0 8px 20px rgba(0,0,0,.35);
  animation: letterOutEnv 620ms cubic-bezier(.22,1,.36,1) 180ms both;
}
@keyframes letterOutEnv { from { transform: translateY(150px); } to { transform: none; } }
.letter-mask.is-closing .letter-card { animation: letterBackEnv 190ms cubic-bezier(.22,1,.36,1) both; }
@keyframes letterBackEnv { from { transform: none; opacity: 1; } to { transform: translateY(48px); opacity: 0; } }

.letter-env {
  position: relative; width: 100%;
  height: clamp(250px, 56vw, 330px);
  margin: -100px 0 0;
  transition: margin-top .7s cubic-bezier(.16,1,.3,1);
}
.letter-stage.is-open .letter-env { margin-top: -150px; }
.env-layer { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.env-back  { z-index: 1; filter: drop-shadow(0 22px 40px rgba(0,0,0,.55)); }
.env-front { z-index: 3; }
.env-flap  { z-index: 4; transform-origin: 50% 0; transform-box: border-box;
             transition: transform .72s cubic-bezier(.34,1.18,.64,1), z-index 0s linear .36s;
             filter: drop-shadow(0 4px 8px rgba(27,24,19,.12)); }
.env-body, .env-lining, .env-front path, .env-flap path { stroke: rgba(27,24,19,.10); stroke-width: 1; }
.env-lining { opacity: 0; transition: opacity .3s ease .12s; }
.letter-stage.is-open .env-lining { opacity: 1; }
.letter-stage.is-open .env-flap {
  transform: perspective(1100px) rotateX(180deg);
  z-index: 0;
}
/* 邮票：贴在信封右上角，齿孔边 + 微倾斜，拆开时随封口一起翻走 */
.letter-stamp {
  position: absolute; z-index: 5;
  top: calc(56% - 50px); left: 50%; margin-left: -46px;
  width: 92px; height: 104px; padding: 9px;
  background: #FCFAF1;
  transform: rotate(-4deg);
  box-shadow: 0 8px 18px rgba(0,0,0,.30), 0 1px 0 rgba(255,255,255,.9) inset;
  display: flex; align-items: center; justify-content: center;
  /* 齿孔：四条边各打一排半圆缺口 */
  -webkit-mask:
    radial-gradient(circle 4px at 50% 0, transparent 97%, #000) 0 0/11px 100% repeat-x,
    radial-gradient(circle 4px at 50% 100%, transparent 97%, #000) 0 100%/11px 100% repeat-x,
    radial-gradient(circle 4px at 0 50%, transparent 97%, #000) 0 0/100% 11px repeat-y,
    radial-gradient(circle 4px at 100% 50%, transparent 97%, #000) 100% 0/100% 11px repeat-y;
  -webkit-mask-composite: source-in;
  mask-composite: intersect;
  transition: opacity .3s ease, transform .5s cubic-bezier(.4,0,.6,1);
}
.letter-stamp img { display: block; width: 100%; height: auto; }
.letter-stage.is-open .letter-stamp {
  opacity: 0; transform: rotate(-4deg) translateY(-16px) scale(.94);
  transition: opacity .26s ease .12s, transform .5s cubic-bezier(.4,0,.6,1);
}
.letter-env-brand {
  position: absolute; left: 0; right: 0; bottom: 20px; z-index: 3; text-align: center;
  font-family: var(--font-display); font-size: 11.5px; letter-spacing: .24em;
  color: rgba(60,48,26,.42);
}
.letter-eyebrow, .letter-title, .letter-body p, .letter-sign { animation: riseIn 400ms cubic-bezier(.2,.8,.3,1) both; }
.letter-eyebrow { animation-delay: 560ms; }
.letter-title { animation-delay: 610ms; }
.letter-body p:nth-of-type(1) { animation-delay: 660ms; }
.letter-body p:nth-of-type(2) { animation-delay: 705ms; }
.letter-body p:nth-of-type(3) { animation-delay: 750ms; }
.letter-sign { animation-delay: 800ms; }
@keyframes riseIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.letter-close {
  position: absolute; top: 14px; right: 14px; width: 34px; height: 34px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(251,247,238,.8); cursor: pointer;
  color: var(--ink-60); font-size: 13px; line-height: 1;
  transition: color .15s, border-color .15s, transform .25s var(--ease);
}
.letter-close:hover { color: var(--ink); border-color: var(--line-strong); transform: rotate(90deg) scale(1.06); }
.letter-eyebrow { margin: 0 0 10px; font-size: 11.5px; letter-spacing: .3em; color: rgba(27,24,19,.5); }
.letter-title {
  margin: 0 0 18px; font-family: var(--font-display); font-size: clamp(21px, 3.2vw, 26px);
  color: var(--ink); padding-bottom: 16px; border-bottom: 1px solid var(--line);
}
/* 信纸横线：每行文字下一条淡蓝虚线（用纸色小块把线切成虚线段） */
.letter-body p {
  margin: 0 0 13px; font-size: var(--fs-m); line-height: 1.9; color: var(--ink);
  background-image:
    repeating-linear-gradient(to right,
      transparent 0 5px,
      #F7F3E8 5px 10px),
    repeating-linear-gradient(to bottom,
      transparent 0,
      transparent calc(1.9em - 1px),
      rgba(58, 92, 140, .30) calc(1.9em - 1px),
      rgba(58, 92, 140, .30) 1.9em);
}
.letter-sign { margin: 22px 0 0; text-align: right; font-family: var(--font-display); font-size: 14.5px; color: var(--ink); line-height: 1.9; }
.letter-sign span { display: block; font-size: 12px; color: var(--ink-40); letter-spacing: .18em; }


/* ── 两段式开信：先信封、后信纸 ── */
/* 信纸插槽：封好时收起，展开时撑开，信封下方自然让位 */
.letter-slot { position: relative; z-index: 2; width: 100%; }

.letter-stage.sealed .letter-slot { display: none; }
.letter-stage.is-open .letter-slot { display: block; }
.letter-stage.sealed .letter-env,
.letter-stage.sealed .letter-stamp { cursor: pointer; }
.letter-stage.is-open .letter-card {
  animation: letterRise .92s cubic-bezier(.22,1,.36,1) .52s both;
  will-change: transform, opacity;
}
@keyframes letterRise {
  0%   { opacity: 0; transform: translate3d(0, 160px, 0) rotate(1.1deg) scale(.99); }
  45%  { opacity: 1; }
  76%  { transform: translate3d(0, -8px, 0) rotate(-.28deg) scale(1.003); }
  100% { opacity: 1; transform: translate3d(0, 0, 0) rotate(0) scale(1); }
}


.letter-stage:not(.sealed) 
@media (prefers-reduced-motion: reduce) {
  .letter-mask::before, .letter-card, .letter-env,
  .letter-eyebrow, .letter-title, .letter-body p, .letter-sign { animation: none !important; }
}

/* ── 补充 ── */
.btn-block { width: 100%; }
.hero-login { margin-top: 20px; font-size: var(--fs-s); }
.hero-login a {
  color: var(--muted); text-decoration: none;
  border-bottom: 1px solid var(--line); padding-bottom: 2px;
  transition: color .18s, border-color .18s;
}
.hero-login a:hover { color: var(--banana); border-bottom-color: var(--banana); }


/* ── 图片放大：页面内 lightbox ── */
.lightbox {
  position: fixed; inset: 0; z-index: 70;
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center; gap: clamp(8px, 2vw, 28px); padding: clamp(16px, 3vw, 36px);
  background: rgba(4, 9, 7, .95);
  animation: veilIn .18s ease-out both;
}
.lightbox[hidden] { display: none; }
.lightbox-stage { display: flex; flex-direction: column; align-items: center; gap: 14px; min-width: 0; }
.lightbox-stage img {
  max-width: 100%; max-height: 78vh; object-fit: contain;
  border: 1px solid var(--line); border-radius: 14px; background: #070C0A;
}
.lightbox-cap {
  display: flex; align-items: center; gap: 16px;
  font-size: 12px; color: var(--muted); 
}
.lightbox-count { color: var(--faint); }
.lightbox-close {
  position: absolute; top: 18px; right: 18px; z-index: 2;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--line); background: rgba(11,20,16,.7); color: var(--ink);
  font-size: 14px; line-height: 1; cursor: pointer; transition: border-color .18s, color .18s;
}
.lightbox-close:hover { border-color: var(--banana); color: var(--banana); }
.lightbox-nav {
  width: 46px; height: 46px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
  font-size: 16px; transition: border-color .18s, color .18s, background .18s;
}
.lightbox-nav:hover { border-color: var(--banana); color: var(--banana); background: rgba(255,229,0,.06); }
@media (max-width: 700px) {
  .lightbox { grid-template-columns: 1fr; padding: 16px; }
  .lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); }
  .lightbox-nav.prev { left: 10px; }
  .lightbox-nav.next { right: 10px; }
  .lightbox-stage img { max-height: 70vh; }
}

/* 内测标记 */
.beta-tag {
  flex: none; font-size: var(--fs-xs); letter-spacing: .06em;
  color: var(--banana); border: 1px solid rgba(255, 229, 0, .45);
  border-radius: 999px; padding: 2px 9px; line-height: 1.6;
}
@media (max-width: 560px) { .beta-tag { display: none; } }

@media (max-width: 900px) { .cmp-cap { min-height: 4.4em; } }
@media (max-width: 560px) { .cmp-cap { min-height: 5.8em; } }


/* ── 品类切换（流水线轮播）── */
.cat-tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.cat-tab {
  appearance: none; cursor: pointer; font: inherit;
  font-size: var(--fs-s); letter-spacing: .02em;
  color: var(--muted); background: transparent;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 18px; transition: color .18s, border-color .18s, background .18s;
}
.cat-tab:hover { color: var(--ink); border-color: var(--line-strong, rgba(255,255,255,.3)); }
.cat-tab.on {
  color: var(--paper-light);
  background: var(--ink);
  border-color: var(--ink);
  font-weight: 600;
}
.flow-strip.is-swapping { opacity: 0; transform: translateY(6px); }
.flow-strip { transition: opacity .22s ease, transform .22s ease; }

/* ══════════ 浅色带：黑白节奏 ══════════
   深色是「棚」，浅色是「纸」。浅色带里重新作用域一套墨色 token，
   里面的组件（规格条、FAQ、样片）不用改一行就跟着变。 */
.band-light {
  --ink: #14120F;
  --muted: rgba(20, 18, 15, .64);
  --faint: rgba(20, 18, 15, .44);
  --line: rgba(20, 18, 15, .14);
  --line-soft: rgba(20, 18, 15, .08);
  --line-strong: rgba(20, 18, 15, .30);
  --banana: #A88400;                 /* 浅底上的黄要压深才看得见 */
  --stage-soft: #E9E3D4;
  position: relative;
  color: var(--ink);
}
/* 100vw 底色铺满视口：父级是 max-width 版心，用伪元素往两边撑，不裁子元素 */
.band-light::before {
  content: '';
  position: absolute; z-index: -1; top: 0; bottom: 0;
  left: 50%; width: 100vw; transform: translateX(-50%);
  background: var(--paper-light);
}
.band-light .bstep img { border-color: rgba(20, 18, 15, .12); }
.band-light .flow-note,
.band-light .band-note { color: var(--faint); }

/* ══════════ 动效层 ══════════ */

/* 首屏光晕：canvas 实时绘制，缓慢漂移 */
.hero { position: relative; isolation: isolate; }
#aura {
  position: absolute; z-index: -1; pointer-events: none;
  left: 50%; top: -10%; width: 150vw; height: 150%;
  transform: translateX(-50%);
  opacity: .6;
}

/* 标题逐行升起 */
.hero-title .ln { display: block; overflow: hidden; padding-bottom: .06em; }
.hero-title .ln > i {
  display: block; font-style: normal;
  transform: translateY(105%);
  animation: lineUp .95s cubic-bezier(.16,1,.3,1) forwards;
}
.hero-title .ln:nth-child(2) > i { animation-delay: .12s; }
@keyframes lineUp { to { transform: none; } }

/* 进入视口浮现：默认只给区块标题和卡片，别把整页都做成入场动画 */
.reveal { opacity: 0; transform: translateY(26px); }
.reveal.in {
  opacity: 1; transform: none;
  transition: opacity .8s cubic-bezier(.16,1,.3,1), transform .8s cubic-bezier(.16,1,.3,1);
}
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  .hero-title .ln > i { animation: none; transform: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  #aura { display: none; }
}

/* ══════════ 右侧刻度尺（贴边、不压内容；章节名悬停才出来） ══════════ */
.rail {
  position: fixed; right: 0; top: 0; bottom: 0; width: 46px; z-index: 25;
  pointer-events: none; display: none; color: #F4F2EA;
  mix-blend-mode: difference;
}
@media (min-width: 1120px) { .rail { display: block; } }

.rail-tape { position: absolute; right: 6px; top: 10vh; bottom: 10vh; width: 22px; }
.rail-tick { position: absolute; right: 0; height: 1px; width: 5px; background: currentColor; opacity: .28; }
.rail-tick.major { width: 9px; opacity: .5; }
.rail-num {
  position: absolute; right: 13px; transform: translateY(-50%);
  font: 8px/1 var(--mono); opacity: .34;
}
.rail-fill { position: absolute; right: 0; top: 0; width: 1.5px; background: currentColor; opacity: .85; }
.rail-head {
  position: absolute; right: -2px; transform: translate(-100%, -50%);
  font: 600 9px/1 var(--mono); padding: 2px 4px; border-radius: 3px;
  background: currentColor; color: #000; white-space: nowrap;
}

/* 弧线章节索引：字贴着右缘排成一条曲线，滚动时整体轻微位移 */
.rail-nav {
  position: absolute; right: 0; top: 8vh; bottom: 8vh; width: 120px;
  pointer-events: auto;
}
.rail-word {
  position: absolute; right: 0; display: block; width: 0; height: 0;
  text-decoration: none; color: currentColor;
}
.rail-arc { position: absolute; right: 0; top: 0; display: block; }
.rail-arc span {
  position: absolute; left: 0; top: 0; display: block;
  font: 500 15px/1 var(--font-display);
  transform-origin: 0 0; white-space: pre;
  transition: opacity .3s;
}
.rail-word.on .rail-arc span { opacity: 1 !important; }

/* 弧线索引先关掉：坐标还没校准，避免上线后字母跑到屏幕外 */
.rail-nav { display: none !important; }

/* Lenis 平滑滚动所需 */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: hidden; }