/* 官网首页（landing）：电影感 / 编辑式 / 建筑感
   首屏 = 全幅动态视觉舞台（4 个场景自动轮播，真实图片素材），下方沿用同一视觉叙事。
   只做展示层与动效层：数据仍来自 /api/catalog，业务逻辑不动 */

/* 页面级安全区：所有容器共用 --page-pad / --page-max，禁止 100vw + padding 混用 */
html, body { width: 100%; max-width: 100%; overflow-x: clip; }
:root {
  --page-pad: clamp(24px, 4vw, 64px);
  --page-max: 1480px;
}

body.landing {
  --bg: #0B0D10;
  --panel: #14171C;
  --text: rgba(255, 255, 255, .94);
  --muted: rgba(255, 255, 255, .58);
  --muted-2: rgba(255, 255, 255, .36);
  --accent: #22C7E8;
  --warm: #FF8A3D;
  --nav-h: 72px;
  --page-pad: clamp(24px, 4vw, 64px);
  --page-max: 1480px;
  --sect-gap: 132px;
  --ease-c: cubic-bezier(0.22, 1, 0.36, 1);
  background: #0B0D10;
}
body.landing::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(1100px 660px at 50% -12%, rgba(34, 199, 232, .09), transparent 64%),
    radial-gradient(900px 640px at 8% 66%, rgba(255, 138, 61, .045), transparent 68%);
}
/* 只给内容层建立层叠上下文，不能影响 fixed 的导航 */
body.landing > :not(.land-top) { position: relative; z-index: 1; }

/* ---------- 顶部导航：悬浮透明，滚动后出现材质 ---------- */
.land-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40;
  height: var(--nav-h); display: flex; align-items: center;
  padding: 0;
  background: transparent; border-bottom: 1px solid transparent;
  transition: background .35s var(--ease-c), border-color .35s var(--ease-c), backdrop-filter .35s var(--ease-c);
}
.land-top.is-scrolled {
  background: rgba(11, 13, 16, .72); backdrop-filter: blur(16px);
  border-bottom-color: rgba(255, 255, 255, .06);
}
.land-top-in {
  width: min(calc(100% - var(--page-pad) * 2), var(--page-max)); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; min-width: 0;
}
.land-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 600; font-size: 15px; letter-spacing: .04em; white-space: nowrap; }
.land-brand .dot { width: 9px; height: 9px; border-radius: 50%; background: #22C7E8; box-shadow: 0 0 14px rgba(34, 199, 232, .8); flex: 0 0 auto; }
.land-nav { display: flex; align-items: center; gap: 28px; font-size: 14px; min-width: 0; }
.land-nav a { color: rgba(255, 255, 255, .62); text-decoration: none; transition: color .2s var(--ease-c); white-space: nowrap; }
.land-nav a:hover { color: #fff; }
.land-actions { display: flex; align-items: center; gap: 16px; flex: 0 0 auto; flex-shrink: 0; padding-right: 2px; }
body.landing .btn { padding: 8px 0; border: 0; background: none; color: rgba(255, 255, 255, .72); font-size: 14px; text-decoration: none; white-space: nowrap; }
body.landing .btn:hover { color: #fff; }
body.landing .btn.primary {
  padding: 9px 18px; border-radius: 999px; color: #fff; font-weight: 500;
  background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .16);
}
body.landing .btn.primary:hover { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .28); }

/* ---------- 官网顶部横幅（运营中心下发，notice.js 渲染） ----------
   放在文档流里、占真实高度（导航是 fixed，所以留出 --nav-h 的空档），
   配置了才有这一条，没配置整块不出现、也不留空白。
   外观（.nb-bar / .nb-card）来自公共 style.css，这里只调落地页的排版。
   ⚠️ 选择器必须带 body.landing：文件上面那条 `body.landing > :not(.land-top)`（0,2,1）
   会给直接子元素强塞 position/z-index，优先级不够就会被首屏盖住。 */
body.landing .nb-site-wrap {
  position: relative; z-index: 39;
  padding: calc(var(--nav-h) + 10px) var(--page-pad) 0;
  display: flex; flex-direction: column; gap: 8px;
}
body.landing .nb-site-wrap.hidden { display: none; }
body.landing .nb-site-wrap .nb-bar-host,
body.landing .nb-site-wrap .nb-banner-host { padding: 0; }
body.landing .nb-site-wrap .nb-banner-host { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

/* ---------- 首屏：模型星河（一个入口 · 聚合全部 AI 模型族） ----------
   不是粒子背景：每个光点都是一个真实上架的模型族（名字与数量来自 /api/catalog）。
   盘面前方的节点更大更亮、后方更小更淡 —— 靠这层远近关系做出星系的立体感。 */
.gh {
  position: relative; height: 94vh; height: 94svh; min-height: 640px;
  padding: 0; overflow: hidden;
  background:
    radial-gradient(80% 64% at 50% 66%, #222d3d 0%, #171d27 46%, #0c0f14 100%),
    linear-gradient(180deg, #0e1218 0%, #0a0c10 100%);
}
/* 极淡噪点：只用来消掉大面积渐变的塑料感 */
.gh::after {
  content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  opacity: .045; mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
/* 锚点跳转时避开固定导航 */
#models, #capabilities { scroll-margin-top: calc(var(--nav-h) + 18px); }
.gh-canvas { position: absolute; inset: 0; z-index: 0; display: block; width: 100%; height: 100%; }
/* 只在文字周围压一点暗，星河本身保持通透 */
.gh-veil {
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  background:
    radial-gradient(62% 42% at 50% 26%, rgba(9, 11, 15, .66) 0%, rgba(9, 11, 15, 0) 76%),
    linear-gradient(180deg, rgba(9, 11, 15, .5) 0%, rgba(9, 11, 15, .06) 26%, rgba(9, 11, 15, 0) 42%, rgba(9, 11, 15, .18) 100%);
}
.gh-inner {
  position: absolute; inset: 0; z-index: 3;
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: clamp(84px, 14.6vh, 152px) var(--page-pad) 0;
}
/* 标题下方承接星河的光晕：让标题像站在星河之上，而不是两块拼在一起 */
.gh-inner::before {
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(50% 40% at 50% 40%, rgba(128, 190, 255, .11) 0%, rgba(128, 190, 255, .03) 46%, rgba(128, 190, 255, 0) 76%);
}

/* 主文案：直接浮在星河上，没有卡片 */
.gh-kicker { display: block; font-size: 12px; letter-spacing: .36em; text-transform: uppercase; color: rgba(214, 232, 255, .58); }
.gh-title {
  margin: 18px 0 0; font-size: clamp(46px, 5.25vw, 80px); line-height: 1.03;
  letter-spacing: -.045em; font-weight: 650; color: #fff;
  text-shadow: 0 4px 44px rgba(6, 9, 16, .78), 0 0 92px rgba(120, 190, 255, .22);
}
.gh-title em {
  font-style: normal;
  background: linear-gradient(96deg, #F6FAFF 0%, #AEEBFC 32%, #22C7E8 66%, #8F96FA 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(90, 190, 255, .28));
}
.gh-sub { margin: 18px 0 0; max-width: 620px; font-size: clamp(15.5px, 1.28vw, 19px); line-height: 1.8; color: rgba(232, 242, 255, .8); }
.gh-cta { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.gh-main {
  display: inline-flex; align-items: center; gap: 10px; text-decoration: none;
  padding: 14px 30px; border-radius: 999px; font-size: 15px; font-weight: 600; color: #0B0D10;
  background: linear-gradient(180deg, #FFFFFF 0%, #E3EAF3 100%);
  box-shadow: 0 12px 34px rgba(140, 200, 255, .18), inset 0 1px 0 rgba(255, 255, 255, .7);
  transition: transform .25s var(--ease-c), box-shadow .25s var(--ease-c);
}
.gh-main:hover { transform: translateY(-1px); box-shadow: 0 16px 40px rgba(140, 200, 255, .3); }
.gh-main i { font-style: normal; transition: transform .25s var(--ease-c); }
.gh-main:hover i { transform: translate(3px, -3px); }
.gh-ghost {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  padding: 14px 26px; border-radius: 999px; font-size: 14.5px; color: rgba(255, 255, 255, .8);
  border: 1px solid rgba(255, 255, 255, .16); background: rgba(255, 255, 255, .03);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  transition: color .25s var(--ease-c), border-color .25s var(--ease-c), background .25s var(--ease-c);
}
.gh-ghost:hover { color: #fff; border-color: rgba(255, 255, 255, .32); background: rgba(255, 255, 255, .07); }
.gh-ghost i { font-style: normal; transition: transform .25s var(--ease-c); }
.gh-ghost:hover i { transform: translateX(4px); }
.gh-note { margin-top: 14px; font-size: 12px; color: rgba(255, 255, 255, .36); }
.gh-note:empty { display: none; }

/* 入场：星河先聚拢，文案再依次浮出（总时长约 1.7s，无弹跳） */
.gh-kicker, .gh-title, .gh-sub, .gh-cta {
  opacity: 0; transform: translateY(16px);
  transition: opacity 1.05s var(--ease-c), transform 1.05s var(--ease-c);
}
.gh.is-in .gh-kicker { opacity: 1; transform: none; transition-delay: .10s; }
.gh.is-in .gh-title { opacity: 1; transform: none; transition-delay: .22s; }
.gh.is-in .gh-sub { opacity: 1; transform: none; transition-delay: .40s; }
.gh.is-in .gh-cta { opacity: 1; transform: none; transition-delay: .62s; }

@media (max-width: 760px) {
  .gh-inner { padding-top: 96px; }
  .gh-note { margin-top: 12px; }
  .gh-title { font-size: clamp(38px, 10.5vw, 54px); }
  .gh-sub { max-width: 92%; font-size: 15px; }
  .gh-cta { margin-top: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  .gh-kicker, .gh-title, .gh-sub, .gh-cta { transition-duration: .2s; transition-delay: 0s; }
}

/* ---------- 品牌指标带：宽、轻、无硬分割线，从首屏星河自然过渡出来 ---------- */
.land-stats {
  position: relative; z-index: 4;
  width: min(calc(100% - var(--page-pad) * 2), 1560px);
  margin: clamp(8px, 1.6vh, 20px) auto 0;
  padding: 36px 12px 32px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid rgba(255, 255, 255, .06); border-radius: 26px;
  background:
    radial-gradient(60% 140% at 12% 0%, rgba(34, 199, 232, .07), transparent 62%),
    linear-gradient(180deg, rgba(255, 255, 255, .045), rgba(255, 255, 255, .008));
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .3);
}
.stat {
  text-align: center; padding: 0 24px;
  background: none; border: 0; box-shadow: none; border-radius: 0;   /* 覆盖全局 .stat 卡样式 */
}
.stat-n { font-size: clamp(34px, 3.4vw, 52px); font-weight: 650; letter-spacing: -.035em; line-height: 1.05; font-variant-numeric: tabular-nums; }
.stat-n #statModels {
  background: linear-gradient(174deg, #FFFFFF 6%, #B6ECFB 42%, #22C7E8 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-n .plus { margin-left: 2px; color: var(--accent); font-size: .5em; font-weight: 600; vertical-align: .32em; }
.stat-n .txt { font-size: .82em; letter-spacing: -.01em; }
.stat-t { margin-top: 12px; font-size: 13px; letter-spacing: .16em; text-transform: uppercase; color: rgba(255, 255, 255, .56); }
.stat-d { margin-top: 8px; font-size: 13px; color: rgba(255, 255, 255, .66); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---------- 区块标题 ---------- */
.sect-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; margin-bottom: 44px; }
.sect-left { min-width: 0; }
.sect-kicker { display: block; font-size: 12px; letter-spacing: .34em; text-transform: uppercase; color: rgba(34, 199, 232, .72); margin-bottom: 16px; }
.sect-title { font-size: clamp(30px, 2.8vw, 44px); font-weight: 600; letter-spacing: -.035em; margin: 0; }
.sect-note { max-width: 360px; margin: 0 0 4px; font-size: 14px; color: var(--muted); line-height: 1.8; text-align: right; }

.land-models, .land-cap, .land-foot { width: min(calc(100% - var(--page-pad) * 2), var(--page-max)); margin-inline: auto; }

/* ---------- 精选模型：左主卡（分栏）+ 右三张紧凑卡 ---------- */
.land-models { margin-top: var(--sect-gap); }
.bento { display: grid; grid-template-columns: repeat(12, 1fr); grid-auto-rows: 172px; gap: 26px; }
.mcard {
  position: relative; overflow: hidden; cursor: pointer; border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, .08);
  background: linear-gradient(180deg, #151A22 0%, #0F1319 100%);
  transition: border-color .3s var(--ease-c), transform .3s var(--ease-c), box-shadow .3s var(--ease-c);
}
.mcard:hover { border-color: rgba(150, 205, 255, .3); transform: translateY(-3px); box-shadow: 0 20px 50px rgba(0, 0, 0, .38); }

/* 主卡：左 34% 文字 / 右 66% 真实界面示意 */
.mcard.big { grid-column: 1 / 8; grid-row: 1 / 4; display: grid; grid-template-columns: 34% 66%; }
.mcard-info { position: relative; z-index: 2; display: flex; flex-direction: column; padding: 36px 34px; min-width: 0; }
.mcard-logo { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.mcard-logo img { width: 44px; height: 44px; border-radius: 12px; }
.mcard-logo .ph { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; background: rgba(255, 255, 255, .08); color: var(--muted); font-size: 16px; }
.mcard-type { font-size: 11px; letter-spacing: .26em; text-transform: uppercase; color: rgba(255, 255, 255, .5); white-space: nowrap; }
.mcard-info h3 { margin: 22px 0 0; font-size: clamp(24px, 2.2vw, 34px); font-weight: 600; letter-spacing: -.035em; line-height: 1.15; }
.mcard-one { margin: 12px 0 0; font-size: 14px; color: rgba(255, 255, 255, .66); }
.mcard-desc {
  margin: 14px 0 0; font-size: 13.5px; line-height: 1.75; color: rgba(255, 255, 255, .58);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.mcard-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.mcard-tags span { font-size: 11.5px; color: rgba(255, 255, 255, .62); border: 1px solid rgba(255, 255, 255, .12); border-radius: 999px; padding: 4px 12px; }
.mcard-buy { display: flex; align-items: center; gap: 18px; margin-top: auto; padding-top: 24px; flex-wrap: wrap; }
.mcard-buy .price { font-size: 15px; color: rgba(255, 255, 255, .88); font-variant-numeric: tabular-nums; }
.mcard-use {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  background: #F6F2EC; color: #0B0D10; padding: 11px 22px; border-radius: 999px; font-size: 14px; font-weight: 600;
  transition: background .25s var(--ease-c);
}
.mcard-use:hover { background: #fff; }
.mcard-use i { font-style: normal; }
.mcard-visual {
  position: relative; overflow: hidden; padding: clamp(18px, 1.8vw, 28px);
  display: flex; align-items: center;
  background: radial-gradient(110% 100% at 82% 14%, rgba(58, 104, 178, .2), rgba(12, 16, 22, 0) 62%);
}
.mcard-visual::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(14, 17, 23, .9) 0%, rgba(14, 17, 23, .2) 22%, rgba(14, 17, 23, 0) 42%);
}

/* 三张紧凑卡：缩略图 + 名称/一句话 + 价格 */
.mcard.small { grid-column: 8 / 13; display: grid; grid-template-columns: 76px 1fr auto; align-items: center; gap: 20px; padding: 20px 24px; }
.mcard.small:nth-of-type(2) { grid-row: 1; }
.mcard.small:nth-of-type(3) { grid-row: 2; }
.mcard.small:nth-of-type(4) { grid-row: 3; }
/* 小卡缩略位：不再是图片，而是各模态自己的符号 */
.mcard-thumb {
  width: 76px; height: 100%; min-height: 76px; border-radius: 14px; overflow: hidden; position: relative;
  display: grid; place-items: center; gap: 4px; align-content: center;
  border: 1px solid rgba(255, 255, 255, .09);
  background: radial-gradient(130% 120% at 28% 18%, rgba(92, 142, 224, .22), rgba(14, 18, 24, .5));
}
.mcard.small .mcard-body { min-width: 0; }
.mcard.small h3 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -.02em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mcard.small p { margin: 8px 0 0; font-size: 13px; color: rgba(255, 255, 255, .6); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.mcard.small .mcard-side { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; flex: 0 0 auto; }
/* 价格：长范围换行显示，不截断 */
.mcard.small .price {
  min-width: 0; max-width: 180px; white-space: normal; overflow-wrap: anywhere; text-align: right;
  font-variant-numeric: tabular-nums; line-height: 1.45; display: grid; justify-items: end; gap: 2px;
}
.mcard.small .price .unit { font-size: 11.5px; letter-spacing: .06em; color: rgba(255, 255, 255, .5); }
.mcard.small .price .range { font-size: 14px; color: rgba(255, 255, 255, .88); }
.mcard-go { color: rgba(255, 255, 255, .38); font-style: normal; transition: color .25s var(--ease-c), transform .25s var(--ease-c); }
.mcard:hover .mcard-go { color: var(--accent); transform: translate(2px, -2px); }

.sect-entry { display: flex; justify-content: center; margin-top: 38px; }
.entry-btn {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  color: var(--text); font-size: 14px; padding: 14px 32px;
  border: 1px solid rgba(255, 255, 255, .12); border-radius: 999px;
  transition: border-color .25s var(--ease-c), background .25s var(--ease-c);
}
.entry-btn:hover { border-color: rgba(255, 255, 255, .28); background: rgba(255, 255, 255, .04); }
.entry-btn b { font-weight: 600; color: var(--accent); }
.entry-btn i { font-style: normal; transition: transform .25s var(--ease-c); }
.entry-btn:hover i { transform: translateX(3px); }

/* ---------- 创作能力：四个章节，图文左右交替（右侧是真实界面示意） ---------- */
.land-cap { margin-top: var(--sect-gap); }
.chapter {
  position: relative; display: grid; grid-template-columns: 1.05fr .95fr;
  min-height: clamp(420px, 44vh, 520px); border-radius: 24px; overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .07);
  background: linear-gradient(180deg, #141A22 0%, #0D1117 100%);
}
.chapter + .chapter { margin-top: 30px; }
.chapter:nth-child(even) { grid-template-columns: .95fr 1.05fr; }
.chapter:nth-child(even) .ch-media { order: 2; }
.chapter:nth-child(even) .ch-copy { order: 1; }
.ch-media {
  position: relative; overflow: hidden; display: grid; place-items: center;
  padding: clamp(24px, 2.8vw, 44px);
  background: radial-gradient(110% 100% at 72% 12%, rgba(62, 112, 192, .22), rgba(10, 13, 18, 0) 62%);
}
.ch-media::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(9, 11, 15, .34) 0%, rgba(9, 11, 15, 0) 46%, rgba(9, 11, 15, .2) 100%);
}
.ch-copy { position: relative; z-index: 2; align-self: center; padding: clamp(30px, 4vw, 56px); }
.ch-no { display: block; font-size: 12.5px; letter-spacing: .34em; color: rgba(34, 199, 232, .8); }
.chapter h3 { margin: 18px 0 0; font-size: clamp(28px, 3vw, 46px); font-weight: 600; letter-spacing: -.045em; line-height: 1.05; }
.chapter p { margin: 16px 0 0; font-size: 15.5px; line-height: 1.8; color: rgba(255, 255, 255, .72); }
.ch-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.ch-tags span { font-size: 11.5px; letter-spacing: .14em; color: rgba(255, 255, 255, .6); border: 1px solid rgba(255, 255, 255, .12); border-radius: 999px; padding: 5px 13px; }
.reveal .ch-copy > * { opacity: 0; transform: translateY(22px); transition: opacity .9s var(--ease-c), transform .9s var(--ease-c); }
.reveal.in .ch-copy > * { opacity: 1; transform: none; }
.reveal.in .ch-copy > *:nth-child(2) { transition-delay: .1s; }
.reveal.in .ch-copy > *:nth-child(3) { transition-delay: .18s; }
.reveal.in .ch-copy > *:nth-child(4) { transition-delay: .24s; }

/* ---------- 页脚 / 入场节奏 ---------- */
.land-foot {
  margin-top: var(--sect-gap); padding-top: 40px; padding-bottom: 80px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  color: var(--muted-2); font-size: 12.5px; border-top: 1px solid rgba(255, 255, 255, .06);
}

/* 左栏：站名 + 备案号（备案号由 foot.js 填，留空时整块不渲染） */
.land-foot .lf-left { display: inline-flex; align-items: center; flex-wrap: wrap; }
.land-foot .lf-icp { color: var(--muted-2); }
.land-foot .lf-icp::before { content: '·'; margin: 0 8px; opacity: .5; }
.land-foot .lf-icp a {
  color: inherit; text-decoration: none; padding-bottom: 1px;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
  transition: color .25s var(--ease-c), border-color .25s var(--ease-c);
}
.land-foot .lf-icp a:hover { color: var(--text); border-color: rgba(255, 255, 255, .42); }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .95s var(--ease-c), transform .95s var(--ease-c); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .bento { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 170px; }
  .mcard.big { grid-column: 1 / 4; grid-row: 1 / 3; }
  .mcard.small { grid-column: auto; grid-row: auto; }
  .mcard.small:nth-of-type(2), .mcard.small:nth-of-type(3), .mcard.small:nth-of-type(4) { grid-row: 3; }
  .land-stats { grid-template-columns: repeat(2, 1fr); row-gap: 22px; padding: 22px 6px; margin-top: 18px; }
  .stat { padding: 0 16px; }
  .stat + .stat { border-left: 0; }
  .stat:nth-child(even) { border-left: 1px solid rgba(255, 255, 255, .07); }
}
/* 中等宽度 / 右侧工作区：说明移到标题下方，导航只留必要项 */
@media (max-width: 1100px) {
  .land-nav a { display: none; }
  .sect-head { flex-direction: column; align-items: flex-start; gap: 0; margin-bottom: 36px; }
  .sect-note { text-align: left; max-width: 620px; margin: 14px 0 0; }
  .chapter { min-height: clamp(420px, 46vh, 520px); }
}
@media (max-width: 860px) {
  .chapter, .chapter:nth-child(even) { grid-template-columns: 1fr; }
  .chapter:nth-child(even) .ch-media, .chapter:nth-child(even) .ch-copy { order: 0; }
  .ch-media { height: clamp(200px, 32vw, 260px); min-height: 0; }
  .ch-copy { align-self: start; padding: 30px 26px 34px; }
  .chapter + .chapter { margin-top: 26px; }
}
@media (max-width: 900px) {
  body.landing { --sect-gap: 108px; }
  .bento { grid-template-columns: 1fr; grid-auto-rows: auto; }
  .mcard.big { grid-column: 1 / 2; grid-row: auto; grid-template-columns: 1fr; }
  .mcard-visual { order: -1; height: 260px; min-height: 0; max-height: 260px; }
  .mcard-visual::after { background: linear-gradient(0deg, rgba(10, 12, 16, .9) 0%, rgba(10, 12, 16, .1) 60%); }
  .mcard.small { grid-column: 1 / 2; grid-row: auto; min-height: 128px; }
  .mcard.small:nth-of-type(2), .mcard.small:nth-of-type(3), .mcard.small:nth-of-type(4) { grid-row: auto; }
  .land-foot { flex-direction: column; gap: 8px; }
}
@media (max-width: 700px) {
  body.landing { --sect-gap: 88px; }
  .gh-note { margin-top: 14px; }
  .mcard-info { padding: 26px 24px 30px; }
  .mcard.small { grid-template-columns: 64px 1fr; padding: 18px 20px; }
  .mcard.small .mcard-side { grid-column: 2; flex-direction: row; align-items: center; justify-content: space-between; }
  .ch-media { min-height: 210px; }
}
@media (prefers-reduced-motion: reduce) {
  /* 内容照常出现，只是不再有循环动效（星河由 JS 停成静态帧） */
  .reveal, .reveal .ch-copy > *, .ch-media img { transition: none; }
  .reveal, .reveal .ch-copy > * { opacity: 1; transform: none; }
}

/* =========================================================================
   整页统一感 + 模型卡/能力区的界面示意（全部纯 CSS，不使用任何图片素材）
   ========================================================================= */

/* ---------- 整页极淡星点层：把首屏的星河延伸到整页，但不抢内容 ----------
   注意：必须用比 `body.landing > :not(.land-top)`（0,2,1）更高的选择器，
   否则会被抢成 position: relative，画布就会变成首页顶部一块实体、把 Hero 顶下去。 */
body.landing canvas.page-stars {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none; opacity: .5;
}

/* 大区块之间用柔光过渡，不用硬边线 */
.land-models, .land-cap { position: relative; }
.land-models::before, .land-cap::before {
  content: ''; position: absolute; left: 50%; top: calc(var(--sect-gap) * -.55);
  width: 130%; height: 340px; transform: translateX(-50%); z-index: -1; pointer-events: none;
  background: radial-gradient(44% 58% at 50% 50%, rgba(62, 122, 204, .13), rgba(62, 122, 204, 0) 72%);
}
.chapter:hover { border-color: rgba(150, 205, 255, .18); }

/* ---------- 主卡视觉：视频分镜 / 图像画布 / 对话推理 / 音频波形 ---------- */
.sb { position: relative; width: 100%; display: grid; gap: 12px; }
.sb-stage {
  position: relative; height: clamp(148px, 14vw, 194px); border-radius: 16px; overflow: hidden;
  border: 1px solid rgba(150, 205, 255, .16); background: linear-gradient(140deg, #1e3050, #101620 66%);
}
.sb-scene {
  position: absolute; inset: 0;
  background:
    radial-gradient(50% 38% at 28% 78%, rgba(255, 170, 100, .4), transparent 72%),
    radial-gradient(44% 34% at 74% 28%, rgba(124, 176, 255, .3), transparent 70%),
    linear-gradient(0deg, #0c1119 0%, rgba(12, 17, 25, 0) 48%);
}
.sb-scene-img {
  background:
    radial-gradient(44% 40% at 24% 76%, rgba(255, 176, 112, .4), transparent 72%),
    radial-gradient(50% 44% at 70% 30%, rgba(126, 176, 255, .34), transparent 72%),
    linear-gradient(160deg, #26364f, #0e1420);
}
.sb-play { position: absolute; left: 50%; top: 50%; width: 48px; height: 48px; margin: -24px 0 0 -24px; border-radius: 50%; background: rgba(255, 255, 255, .92); }
.sb-play::after { content: ''; position: absolute; left: 19px; top: 14px; border-left: 15px solid #0B0D10; border-top: 10px solid transparent; border-bottom: 10px solid transparent; }
.sb-badge {
  position: absolute; left: 12px; top: 12px; font-size: 11px; letter-spacing: .06em;
  padding: 4px 10px; border-radius: 999px; color: rgba(255, 255, 255, .88);
  background: rgba(9, 13, 19, .5); border: 1px solid rgba(255, 255, 255, .16);
}
.sb-time { position: absolute; right: 12px; top: 12px; font-size: 11px; color: rgba(255, 255, 255, .68); font-variant-numeric: tabular-nums; }
.sb-prog { position: absolute; left: 12px; right: 12px; bottom: 12px; height: 3px; border-radius: 2px; background: rgba(255, 255, 255, .18); }
.sb-prog b { display: block; height: 100%; width: 64%; border-radius: 2px; background: linear-gradient(90deg, #22C7E8, #9FE6FA); }
.sb-sel { position: absolute; left: 24%; top: 30%; width: 44%; height: 44%; border: 1.5px dashed rgba(255, 255, 255, .82); border-radius: 6px; }
.sb-track { position: relative; display: flex; gap: 7px; }
.sb-clip { flex: 1; height: 36px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .12); }
.sb-clip:nth-child(1) { background: linear-gradient(120deg, rgba(70, 130, 210, .42), rgba(18, 26, 38, .7)); }
.sb-clip:nth-child(2) { background: linear-gradient(120deg, rgba(122, 100, 225, .42), rgba(18, 26, 38, .7)); }
.sb-clip:nth-child(3) { background: linear-gradient(120deg, rgba(255, 152, 92, .34), rgba(18, 26, 38, .7)); }
.sb-clip:nth-child(4) { background: linear-gradient(120deg, rgba(92, 214, 200, .36), rgba(18, 26, 38, .7)); }
.sb-head { position: absolute; left: 47%; top: -6px; width: 2px; height: 48px; background: #FF8A3D; box-shadow: 0 0 10px rgba(255, 138, 61, .85); }
.sb-strip span { flex: 1; height: 36px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .1); }
.sb-strip span:nth-child(1) { background: linear-gradient(140deg, rgba(90, 200, 255, .3), rgba(18, 26, 38, .6)); }
.sb-strip span:nth-child(2) { background: linear-gradient(140deg, rgba(143, 123, 247, .3), rgba(18, 26, 38, .6)); }
.sb-strip span:nth-child(3) { background: linear-gradient(140deg, rgba(255, 170, 110, .26), rgba(18, 26, 38, .6)); }
.sb-strip span:nth-child(4) { background: linear-gradient(140deg, rgba(92, 214, 200, .28), rgba(18, 26, 38, .6)); }
.sb-strip span:nth-child(5) { background: linear-gradient(140deg, rgba(90, 140, 220, .3), rgba(18, 26, 38, .6)); }
.sb-foot { display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: rgba(255, 255, 255, .64); }
.sb-f { border: 1px solid rgba(255, 255, 255, .13); border-radius: 999px; padding: 3px 10px; white-space: nowrap; }
.sb-r { margin-left: auto; color: #9FE6FA; white-space: nowrap; }
/* 对话卡：气泡 + 代码 */
.sb-chat { display: grid; align-content: end; gap: 8px; padding: 14px; }
.sb-bb { display: block; height: 22px; border-radius: 11px; }
.sb-bb.me { width: 62%; margin-left: auto; background: linear-gradient(180deg, #E4ECF5, #C9D6E5); }
.sb-bb.ai { width: 86%; background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .1); }
.sb-bb.ai.short { width: 54%; }
.sb-code { display: grid; gap: 7px; padding: 12px 14px; border-radius: 12px; border: 1px solid rgba(150, 205, 255, .14); background: rgba(8, 12, 18, .66); }
.sb-code i { display: block; height: 6px; border-radius: 3px; background: rgba(178, 214, 255, .3); }
.sb-code i:nth-child(1) { width: 46%; background: rgba(127, 214, 255, .5); }
.sb-code i:nth-child(2) { width: 72%; }
.sb-code i:nth-child(3) { width: 58%; }
.sb-code i:nth-child(4) { width: 82%; background: rgba(198, 168, 255, .42); }
.sb-code i:nth-child(5) { width: 38%; background: rgba(255, 192, 138, .42); }
/* 音频卡：波形柱 */
.sb-au { display: flex; align-items: center; gap: 5px; padding: 18px; }
.sb-au i { flex: 1; height: var(--h, 50%); border-radius: 3px; background: linear-gradient(180deg, #9FE6FA, rgba(34, 199, 232, .4)); }

/* ---------- 三张小卡的模态符号（不是图片） ---------- */
.mcard-thumb i { display: block; border-radius: 3px; background: rgba(226, 240, 255, .62); }
.t-chat i { width: 34px; height: 3px; }
.t-chat i:nth-child(2) { width: 26px; opacity: .62; }
.t-chat i:nth-child(3) { width: 16px; opacity: .34; }
.t-image i:nth-child(1) { width: 34px; height: 26px; border-radius: 6px; background: linear-gradient(135deg, #59C8FF, #8F7BF7); }
.t-image i:nth-child(2) { width: 12px; height: 12px; border-radius: 3px; border: 1.5px solid rgba(255, 255, 255, .8); background: none; position: absolute; right: 16px; bottom: 18px; }
.t-image i:nth-child(3) { display: none; }
.t-video i:nth-child(1) { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(140deg, #2E5A96, #16202E); position: relative; }
.t-video i:nth-child(1)::after { content: ''; position: absolute; left: 13px; top: 10px; border-left: 11px solid rgba(255, 255, 255, .92); border-top: 7px solid transparent; border-bottom: 7px solid transparent; }
.t-video i:nth-child(2), .t-video i:nth-child(3) { width: 26px; height: 3px; background: rgba(155, 202, 255, .5); }
.t-audio i { width: 4px; border-radius: 2px; background: linear-gradient(180deg, #9FE6FA, rgba(34, 199, 232, .5)); }
.t-audio i:nth-child(1) { height: 14px; }
.t-audio i:nth-child(2) { height: 30px; }
.t-audio i:nth-child(3) { height: 20px; }
.t-audio { display: flex; align-items: center; justify-content: center; gap: 4px; }

/* ---------- 能力区：四个真实的界面示意 ---------- */
.ui {
  position: relative; z-index: 2; width: 100%; max-width: 560px; border-radius: 18px; overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .1);
  background: linear-gradient(180deg, rgba(25, 31, 41, .94), rgba(13, 17, 23, .96));
  box-shadow: 0 30px 70px rgba(0, 0, 0, .42);
}
.ui-bar { display: flex; align-items: center; gap: 10px; padding: 13px 16px; border-bottom: 1px solid rgba(255, 255, 255, .07); font-size: 12.5px; color: rgba(255, 255, 255, .8); }
.ui-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px rgba(34, 199, 232, .8); flex: 0 0 auto; }
.ui-name { font-weight: 500; }
.ui-tag { margin-left: auto; font-size: 11px; color: rgba(255, 255, 255, .58); border: 1px solid rgba(255, 255, 255, .13); border-radius: 999px; padding: 3px 10px; white-space: nowrap; }
.ui-body { padding: 16px; display: grid; gap: 12px; }

/* 对话与推理 */
.msg { max-width: 80%; font-size: 12.5px; line-height: 1.6; padding: 9px 13px; border-radius: 12px; }
.msg.me { margin-left: auto; color: #0B0D10; background: linear-gradient(180deg, #EAF1F8, #D3DEEA); border-bottom-right-radius: 4px; }
.msg.ai { width: 84%; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .08); border-bottom-left-radius: 4px; display: grid; gap: 6px; }
.ai-l { display: block; height: 6px; width: var(--w, 70%); border-radius: 3px; background: rgba(178, 214, 255, .34); }
.code { border-radius: 12px; overflow: hidden; border: 1px solid rgba(150, 205, 255, .14); background: rgba(8, 12, 18, .7); }
.code-top { display: flex; align-items: center; gap: 8px; padding: 8px 12px; font-size: 11.5px; color: rgba(255, 255, 255, .62); border-bottom: 1px solid rgba(255, 255, 255, .06); }
.code-run { margin-left: auto; color: #0B0D10; background: #9FE6FA; border-radius: 999px; padding: 2px 10px; font-size: 11px; }
.code-body { padding: 10px 12px; display: grid; gap: 7px; font-size: 12px; font-family: ui-monospace, Menlo, Consolas, monospace; color: rgba(214, 232, 255, .84); }
.code-body .ln { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.code-body .k1 { color: #7FD6FF; font-style: normal; }
.code-body .k2 { color: rgba(255, 255, 255, .36); font-style: normal; }
.code-body .k3 { color: #FFC08A; font-style: normal; }
.code-body b { color: #C6A8FF; font-weight: 500; }
.steps { display: flex; flex-wrap: wrap; gap: 8px; font-size: 11.5px; }
.st { border-radius: 999px; padding: 4px 11px; border: 1px solid rgba(255, 255, 255, .13); color: rgba(255, 255, 255, .68); }
.st.ok { border-color: rgba(112, 236, 214, .34); color: #8FF0DC; }
.st.ok::before { content: '✓ '; }
.st.run { border-color: rgba(34, 199, 232, .5); color: #9FE6FA; }
.st.run::before { content: '● '; }

/* 图像创作 */
.ui-body.im { grid-template-columns: 84px 1fr 106px; gap: 12px; align-items: start; }
.im-ref { height: 82px; border-radius: 12px; border: 1px solid rgba(255, 255, 255, .1); background: linear-gradient(140deg, #2C3D58, #16202E); position: relative; }
.im-lbl { position: absolute; left: 8px; bottom: 6px; font-size: 10.5px; color: rgba(255, 255, 255, .62); }
.im-canvas { position: relative; height: 172px; border-radius: 12px; overflow: hidden; border: 1px solid rgba(150, 205, 255, .18); }
.im-art {
  position: absolute; inset: 0;
  background:
    radial-gradient(58% 44% at 30% 76%, rgba(255, 176, 112, .5), transparent 72%),
    radial-gradient(50% 40% at 74% 26%, rgba(126, 176, 255, .42), transparent 72%),
    linear-gradient(160deg, #2C3F5C, #101724);
}
.im-sel { position: absolute; left: 26%; top: 32%; width: 42%; height: 42%; border: 1.5px dashed rgba(255, 255, 255, .82); border-radius: 6px; }
.im-handle { position: absolute; right: -4px; bottom: -4px; width: 8px; height: 8px; border-radius: 2px; background: #fff; }
.im-prompt { position: absolute; left: 10px; right: 10px; bottom: 10px; font-size: 11px; color: rgba(255, 255, 255, .84); background: rgba(9, 13, 19, .55); border-radius: 8px; padding: 6px 9px; }
.im-side { display: grid; gap: 8px; align-content: start; }
.im-out { height: 44px; border-radius: 9px; border: 1px solid rgba(255, 255, 255, .1); background: linear-gradient(140deg, rgba(90, 200, 255, .2), rgba(143, 123, 247, .16)); }
.im-side .im-lbl { position: static; }
.im-chips { display: flex; flex-wrap: wrap; gap: 5px; }
.im-chips span { font-size: 10.5px; padding: 3px 8px; border-radius: 999px; border: 1px solid rgba(255, 255, 255, .13); color: rgba(255, 255, 255, .64); }
.im-chips span.on { border-color: rgba(34, 199, 232, .55); color: #9FE6FA; }

/* 视频生成 */
.vd-stage {
  position: relative; height: 178px; border-radius: 12px; overflow: hidden;
  border: 1px solid rgba(150, 205, 255, .16);
  background:
    radial-gradient(48% 36% at 66% 74%, rgba(255, 170, 100, .34), transparent 72%),
    linear-gradient(0deg, #0C1119 0%, rgba(12, 17, 25, 0) 46%),
    linear-gradient(140deg, #1F3252, #101620 68%);
}
.vd-play { position: absolute; left: 50%; top: 50%; width: 46px; height: 46px; margin: -23px 0 0 -23px; border-radius: 50%; background: rgba(255, 255, 255, .92); }
.vd-play::after { content: ''; position: absolute; left: 18px; top: 14px; border-left: 14px solid #0B0D10; border-top: 9px solid transparent; border-bottom: 9px solid transparent; }
.vd-time { position: absolute; right: 10px; top: 10px; font-size: 11px; color: rgba(255, 255, 255, .7); font-variant-numeric: tabular-nums; }
.vd-prog { position: absolute; left: 10px; right: 10px; bottom: 10px; height: 3px; border-radius: 2px; background: rgba(255, 255, 255, .18); }
.vd-prog i { display: block; height: 100%; width: 64%; border-radius: 2px; background: linear-gradient(90deg, #22C7E8, #9FE6FA); }
.vd-track { position: relative; display: flex; gap: 7px; }
.vd-clip { flex: 1; height: 40px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .12); }
.vd-clip.c1 { background: linear-gradient(120deg, rgba(70, 130, 210, .4), rgba(18, 26, 38, .7)); }
.vd-clip.c2 { background: linear-gradient(120deg, rgba(122, 100, 225, .4), rgba(18, 26, 38, .7)); }
.vd-clip.c3 { background: linear-gradient(120deg, rgba(255, 152, 92, .32), rgba(18, 26, 38, .7)); }
.vd-clip.c4 { background: linear-gradient(120deg, rgba(92, 214, 200, .34), rgba(18, 26, 38, .7)); }
.vd-head { position: absolute; left: 47%; top: -7px; width: 2px; height: 54px; background: #FF8A3D; box-shadow: 0 0 10px rgba(255, 138, 61, .85); }
.vd-frames { display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: rgba(255, 255, 255, .68); }
.vd-f { border: 1px solid rgba(255, 255, 255, .13); border-radius: 999px; padding: 4px 11px; }
.vd-note { margin-left: auto; color: #9FE6FA; }

/* 音频与配音 */
.au-wave { display: flex; align-items: center; gap: 3px; height: 72px; }
.au-wave i { flex: 1; height: var(--h, 50%); border-radius: 3px; background: linear-gradient(180deg, #9FE6FA, rgba(34, 199, 232, .45)); }
.au-voice { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: rgba(255, 255, 255, .8); }
.au-av { width: 30px; height: 30px; border-radius: 50%; flex: 0 0 auto; background: radial-gradient(circle at 34% 30%, #9FE6FA, #2B6EA8); }
.au-tag { margin-left: auto; font-size: 11px; color: #8FF0DC; border: 1px solid rgba(112, 236, 214, .34); border-radius: 999px; padding: 3px 10px; }
.au-emo { display: grid; grid-template-columns: auto 1fr auto 1fr; align-items: center; gap: 10px; font-size: 11.5px; color: rgba(255, 255, 255, .6); }
.au-slider { display: block; height: 4px; border-radius: 2px; background: rgba(255, 255, 255, .14); position: relative; }
.au-slider b { position: absolute; left: 0; top: -3px; height: 10px; width: var(--w, 50%); border-radius: 999px; background: linear-gradient(90deg, #22C7E8, #9FE6FA); }
.au-text { font-size: 12.5px; line-height: 1.7; color: rgba(226, 240, 255, .8); }
.au-spec {
  height: 34px; border-radius: 8px;
  background-image: repeating-linear-gradient(90deg, rgba(150, 205, 255, .32) 0 2px, transparent 2px 7px);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, #000 58%, transparent 100%);
  mask-image: linear-gradient(90deg, #000 0%, #000 58%, transparent 100%);
}

/* 窄屏：界面示意按比例缩小，保证文字仍可读 */
@media (max-width: 900px) {
  .ui { max-width: 100%; }
  .ui-body.im { grid-template-columns: 68px 1fr; }
  .im-side { grid-column: 1 / -1; grid-template-columns: repeat(3, 1fr) auto; display: grid; }
  .sb-stage, .vd-stage { height: 148px; }
}

body.landing .land-actions a.btn{display:inline-flex;align-items:center;justify-content:center;box-sizing:border-box;height:36px;padding-block:0;line-height:1.2;vertical-align:middle}