/* ============================================================
   ANCEL — 滚动叙事产品页（白色 × 橙色点缀 × 浅灰过渡）
   模块编号与 index.html / main.js 中的注释一致
   ============================================================ */

:root{
  --bg: #ffffff;
  --bg-2: #f6f6f4;
  --bg-3: #efefec;
  --ink: #141210;
  --ink-dim: rgba(20, 18, 16, .56);
  --ink-faint: rgba(20, 18, 16, .34);
  --line: rgba(20, 18, 16, .12);
  --accent: #ff5a00;
  --accent-soft: rgba(255, 90, 0, .08);
  --accent-dim: rgba(255, 90, 0, .35);
  --red: #e0483e;
  --font: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --nav-h: 72px;
}

*{ margin: 0; padding: 0; box-sizing: border-box; }

html{ -webkit-font-smoothing: antialiased; }
html.lenis, html.lenis body{ height: auto; }
.lenis.lenis-smooth{ scroll-behavior: auto !important; }

body{
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  overscroll-behavior-y: none;
}
body.is-loading{ overflow: hidden; }
body.is-overlay{ overflow: hidden; }

img, video, canvas{ display: block; max-width: 100%; }
button{ font-family: inherit; }
::selection{ background: var(--accent); color: #fff; }

/* no-js 降级：隐藏加载层与纯装饰 */
html.no-js #preloader, html.no-js #progress, html.no-js .cursor{ display: none; }
html.no-js .hero-char-wrap{ overflow: visible; }

/* ---------- 通用 ---------- */
.section{ position: relative; padding: 18vh clamp(24px, 6vw, 84px); }
.text-accent{ color: var(--accent); }

/* 浅灰左右过渡带（白 → 浅灰 → 白） */
.section--band{
  background: linear-gradient(90deg,
    #ffffff 0%, #f5f4f1 18%, #efeeea 50%, #f5f4f1 82%, #ffffff 100%);
}

.btn{
  display: inline-block;
  border: none;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  padding: 13px 26px;
  cursor: pointer;
  transition: transform .3s var(--ease-out), opacity .3s, background .3s;
}
.btn:hover{ transform: translateY(-2px); opacity: .88; }
.btn--small{ padding: 10px 18px; font-size: 12px; }
.btn--ghost{
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn--ghost:hover{ border-color: var(--accent); color: var(--accent); opacity: 1; }

@keyframes spin{ to{ transform: rotate(360deg); } }

/* ============================================================
   ============ 1. Preloader ============
   ============================================================ */
#preloader{
  position: fixed; inset: 0; z-index: 2000;
  background: #ffffff;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.preloader-num{
  font-size: clamp(4rem, 14vw, 10rem);
  font-weight: 200;
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink);
}
.preloader-line{ width: 170px; height: 1px; background: var(--line); margin-top: 30px; overflow: hidden; }
.preloader-line span{
  display: block; width: 100%; height: 100%;
  background: var(--accent);
  transform: scaleX(0); transform-origin: 0 0;
}
.preloader-logo{ margin-top: 20px; height: 60px; width: auto; display: block; }

/* ============================================================
   ============ 2. 顶部滚动进度条（橙色） ============
   ============================================================ */
#progress{ position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 960; }
#progress-bar{
  display: block; width: 100%; height: 100%;
  background: var(--accent);
  transform: scaleX(0); transform-origin: 0 0;
}

/* ============================================================
   ============ 3. 固定导航 ============
   ============================================================ */
#nav{
  position: fixed; top: 0; left: 0; right: 0; z-index: 950;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-h);
  padding: 0 clamp(24px, 4vw, 56px);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.nav-logo{ display: flex; align-items: center; text-decoration: none; }
.nav-logo-img{ height: 28px; width: auto; display: block; }
.nav-links{ display: flex; gap: 40px; }
.nav-links a{
  font-size: 16px; font-weight: 700; letter-spacing: .1em;
  color: var(--ink); text-decoration: none;
  transition: color .3s;
}
.nav-links a:hover{ color: var(--accent); }
.nav-auth{ display: flex; align-items: center; gap: 14px; }
.nav-auth-icon{
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--line); background: transparent;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink); cursor: pointer;
  transition: border-color .3s, color .3s, transform .3s var(--ease-out);
}
.nav-auth-icon:hover{ border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.nav-auth-icon svg{ width: 17px; height: 17px; display: block; }
.btn--accent{ background: var(--accent); }
.btn--accent:hover{ opacity: .9; }


/* ============================================================
   ============ 4. Hero ============
   ============================================================ */
.section--hero{
  padding: 0;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
}
/* 4b. 卡片滚动放大全屏时，hero 被 pin 固定：抬升层级盖住下方滑过内容（仍在顶部白色主导航之下） */
#hero.is-pinned{ z-index: 850; }
.hero-bg{
  position: absolute; inset: -12% 0;
  z-index: 0;
  background:
    radial-gradient(90% 65% at 82% 16%, rgba(255, 90, 0, .09), transparent 62%),
    radial-gradient(75% 55% at 10% 88%, rgba(20, 18, 16, .05), transparent 60%),
    radial-gradient(120% 90% at 50% 0%, #f4f3ef, #ffffff 72%);
  will-change: transform;
}
.hero-inner{
  position: relative; z-index: 1;
  width: 100%;
  min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  padding: 14vh clamp(24px, 6vw, 84px) 12vh;
}
.hero-tagline{
  font-size: clamp(12px, 1.1vw, 14px);
  letter-spacing: .3em; text-indent: .3em;
  color: var(--ink-dim);
  margin-bottom: 4vh;
}
.hero-title{
  font-size: clamp(3rem, 11vw, 9.5rem);
  font-weight: 650;
  letter-spacing: -.03em;
  line-height: 1.05;
}
.hero-char-wrap{ display: inline-block; overflow: hidden; vertical-align: bottom; }
.hero-char{ display: inline-block; will-change: transform; }
.hero-title-star{
  font-size: .35em; font-weight: 400;
  color: var(--accent);
  vertical-align: super;
  margin-left: .15em;
}
.hero-sub{
  width: 100%;
  max-width: 560px;
  margin: 3.5vh auto 0;
  text-align: center;
  font-size: clamp(13px, 1.2vw, 15px);
  color: var(--ink-dim);
}
.hero-card{
  position: relative;
  width: min(880px, 88vw);
  aspect-ratio: 16 / 9;
  margin-top: 7vh;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, #f7f6f3, #e8e7e3);
  box-shadow: 0 30px 80px rgba(20, 18, 16, .10);
  cursor: pointer;
}
.hero-card-video{ width: 100%; height: 100%; object-fit: cover; }
.hero-card-label{
  position: absolute; left: 18px; bottom: 14px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .22em;
  color: rgba(255,255,255,.85);
  background: rgba(20,18,16,.4);
  padding: 6px 11px; border-radius: 6px;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.hero-hint{
  position: absolute; bottom: 4vh; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .3em; text-indent: .3em;
  color: var(--ink-dim);
  writing-mode: vertical-rl;
}
.hero-hint-line{
  width: 1px; height: 44px;
  background: var(--line);
  position: relative; overflow: hidden;
}
.hero-hint-line::after{
  content: ""; position: absolute; inset: 0;
  background: var(--accent);
  animation: hint-drop 2s var(--ease-out) infinite;
}
@keyframes hint-drop{
  0%{ transform: translateY(-100%); }
  60%{ transform: translateY(0); }
  100%{ transform: translateY(100%); }
}

/* ============================================================
   ============ 5. 跑马灯文字带（纯 CSS，双向） ============
   ============================================================ */
.marquee{
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  background: #fff;
}
.mq-row{
  display: flex;
  width: max-content;
  animation: mq 26s linear infinite;
}
.mq-row + .mq-row{ margin-top: 10px; }
.mq-row.rev{ animation-direction: reverse; animation-duration: 32s; }
.mq-half{
  display: flex; align-items: center; gap: 2.6em;
  padding-right: 2.6em;
  font-family: var(--mono);
  font-size: clamp(12px, 1.3vw, 15px);
  font-weight: 500;
  letter-spacing: .26em;
  color: rgba(20, 18, 16, .48);
  white-space: nowrap;
}
.mq-half .o{ color: var(--accent); letter-spacing: 0; font-size: 1.2em; }
@keyframes mq{ to{ transform: translateX(-50%); } }

/* ============================================================
   ============ 6. AI 区 ============
   ============================================================ */
.ai-inner{
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1.1fr;
  gap: 6vw; align-items: start;
}
.ai-h2{
  font-size: clamp(2.6rem, 6.5vw, 5.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.12;
}
.ai-type{
  font-family: var(--mono);
  font-size: clamp(1.2rem, 2.2vw, 1.8rem);
  color: var(--accent);
  letter-spacing: .02em;
  min-height: 2.4em;
  margin-bottom: 2vh;
}
.ai-type::after{
  content: "▍";
  margin-left: 2px;
  animation: caret 1s steps(1) infinite;
  color: var(--accent-dim);
}
@keyframes caret{ 50%{ opacity: 0; } }
.ai-note{ color: var(--ink-dim); font-size: 14px; max-width: 480px; margin-bottom: 6vh; }
.ai-chat{
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: #faf9f7;
}
.ai-chat-bubbles{ display: flex; flex-direction: column; gap: 10px; min-height: 20px; margin-bottom: 14px; }
.ai-bubble{
  max-width: 82%;
  padding: 10px 15px;
  border-radius: 14px;
  font-size: 14px; line-height: 1.5;
}
.ai-bubble--user{
  align-self: flex-end;
  background: var(--accent); color: #fff;
  border-bottom-right-radius: 4px;
}
.ai-bubble--bot{
  align-self: flex-start;
  background: #fff; border: 1px solid var(--line);
  color: var(--ink);
  border-bottom-left-radius: 4px;
}
.ai-chat-form{ display: flex; gap: 10px; }
.ai-chat-form input{
  flex: 1;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 11px 18px;
  color: var(--ink);
  font-size: 13px;
  outline: none;
  transition: border-color .3s;
}
.ai-chat-form input:focus{ border-color: var(--accent); }
.ai-chat-form input::placeholder{ color: var(--ink-faint); }

/* ============================================================
   ============ 7. 粘性章节切换（sticky 舞台 + 交叉淡入 + 圆点） ============
   ============================================================ */
.section--chapters{ padding: 0; }
.ch-stage{
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  background: #fff;
}
.ch-layer{
  position: absolute;
  padding: 0 8vw;
  will-change: transform, opacity;
}
.ch-no{
  display: block;
  font-family: var(--mono);
  font-size: 12px; letter-spacing: .4em; text-indent: .4em;
  color: var(--accent);
  margin-bottom: 26px;
}
.ch-layer h2{
  font-size: clamp(2.4rem, 7vw, 6rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.1;
  margin-bottom: 22px;
}
.ch-layer p{
  color: var(--ink-dim);
  font-size: clamp(14px, 1.3vw, 16px);
  max-width: 520px;
  margin: 0 auto;
}
.ch-dots{
  position: absolute; bottom: 6vh; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 14px;
}
.ch-dot{
  width: 9px; height: 9px;
  border-radius: 50%;
  border: none;
  background: var(--ink-faint);
  cursor: pointer;
  transition: background .3s, transform .45s var(--ease-out);
}
.ch-dot:hover{ background: var(--ink-dim); }
.ch-dot.is-active{ background: var(--accent); transform: scale(1.55); }
.chapter{ height: 100vh; height: 100svh; }

/* ============================================================
   ============ 8. 参数区（大数字滚动） ============
   ============================================================ */
.section--band .container{ max-width: 1400px; margin: 0 auto; }
#specs .sec-head{
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 8vh;
}
.spec-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(28px, 4vw, 56px);
}
.spec{
  border-top: 1px solid var(--line);
  padding-top: 26px;
  transition: border-color .4s;
}
.spec:hover{ border-top-color: var(--accent); }
.spec .num{
  font-size: clamp(2.6rem, 5.2vw, 4.6rem);
  font-weight: 250; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink);
}
.spec .num .unit{
  font-size: .42em;
  color: var(--accent);
  margin-left: 6px;
  font-weight: 400;
  letter-spacing: 0;
}
.spec .label{
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .2em;
  color: var(--ink-dim);
}

/* ============================================================
   ============ 9. Wearable（pin 画廊 + 3D + 倾斜聚光灯） ============
   ============================================================ */
.section--wearable{ padding: 0; }
.wearable-stage{
  position: relative;
  height: 100vh; height: 100svh;
  overflow: hidden;
  background: linear-gradient(180deg, #fff 0%, #f4f3f0 100%);
}
.wearable-canvas{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}
.wearable-gallery{
  position: absolute; inset: 0;
  z-index: 2;
  display: flex; align-items: center;
  pointer-events: none;
}
.wearable-track{
  display: flex;
  gap: 4vw;
  width: max-content;
  padding: 0 8vw;
  will-change: transform;
}
.g-card{
  width: min(52vw, 560px);
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 24px 64px rgba(20, 18, 16, .08);
  position: relative;
  transform-style: preserve-3d;
  will-change: transform;
  pointer-events: auto;
  cursor: default;
}
/* 聚光灯（JS 写入 --mx / --my） */
.g-card::before{
  content: "";
  position: absolute; inset: 0;
  z-index: 2;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%),
    rgba(255, 90, 0, .11), transparent 62%);
  opacity: 0;
  transition: opacity .4s;
  pointer-events: none;
}
.g-card:hover::before{ opacity: 1; }
.g-card--wide{ width: min(62vw, 700px); }
.wearable-track .g-card:nth-child(even){ margin-top: -6vh; }
.wearable-track .g-card:nth-child(odd):not(:first-child){ margin-top: 6vh; }
.g-card-media{
  position: relative;
  height: 220px;
}
.g-card-media--a{ background: radial-gradient(120% 150% at 20% 0%, #e8e5de, #d4d1c8 70%); }
.g-card-media--b{ background: radial-gradient(120% 150% at 80% 10%, #e2e2de, #c9cbc6 70%); }
.g-card-media--c{ background: radial-gradient(120% 150% at 50% 110%, #ebe7e0, #cfccc3 70%); }
.g-card-media--d{ background: radial-gradient(120% 150% at 10% 90%, #e6e3dc, #cbc9c1 70%); }
.g-card-media--e{
  background: radial-gradient(90% 120% at 78% 82%, rgba(255, 90, 0, .30), transparent 58%),
              radial-gradient(120% 150% at 90% 90%, #e9e6df, #d0cec6 70%);
}
.g-card-img{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.g-card-no{
  position: absolute; top: 14px; right: 14px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .18em;
  color: var(--ink);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
}
.g-card-body{ padding: 26px 26px 20px; }
.g-card-body h3{ font-size: 1.35rem; font-weight: 650; letter-spacing: -.01em; margin-bottom: 10px; }
.g-card-body p{ font-size: 14px; color: var(--ink-dim); min-height: 4.2em; }
.g-card-foot{
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 18px;
}
.g-card-barcode{
  width: 110px; height: 24px;
  background: repeating-linear-gradient(90deg,
    rgba(20,18,16,.75) 0 2px, transparent 2px 4px,
    rgba(20,18,16,.75) 4px 7px, transparent 7px 9px,
    rgba(20,18,16,.75) 9px 10px, transparent 10px 14px);
  opacity: .8;
}
.g-card-meta{ font-family: var(--mono); font-size: 10px; letter-spacing: .14em; color: var(--ink-faint); }
.wearable-index{
  position: absolute; right: 4vw; bottom: 4vh; z-index: 3;
  display: flex; align-items: baseline; gap: 6px;
  font-family: var(--mono);
}
.wearable-index span{ font-size: 1.3rem; color: var(--accent); font-variant-numeric: tabular-nums; }
.wearable-index em{ font-style: normal; font-size: 11px; color: var(--ink-faint); }

/* ============================================================
   ============ 10. Features（滑块 3D + 贝塞尔 + 旋转 logo） ============
   ============================================================ */
.features-inner{ max-width: 1400px; margin: 0 auto; }
.f-item{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6vw;
  align-items: center;
  min-height: 92vh;
  padding: 8vh 0;
}
.f-item--flip .f-item-copy{ order: 2; }
.f-item--flip .f-item-stage{ order: 1; }
.f-item-idx{
  font-family: var(--mono); font-size: 12px; letter-spacing: .2em;
  color: var(--accent);
  display: inline-block; margin-bottom: 18px;
}
.f-item-copy h3{
  font-size: clamp(1.8rem, 3.4vw, 2.8rem);
  font-weight: 650; letter-spacing: -.02em;
  margin-bottom: 18px;
}
.f-item-copy p{ color: var(--ink-dim); font-size: 15px; max-width: 440px; }
.f-item-stage{
  position: relative;
  height: 70vh;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #f7f6f3, #e9e8e4);
}
.features-canvas{ width: 100%; height: 100%; }
.f-slider{ margin-top: 5vh; }
.f-slider input{
  width: 100%; max-width: 420px;
  accent-color: var(--accent);
  cursor: pointer;
  height: 28px;
}
.f-slider-readout{
  margin-top: 10px;
  font-size: 2.6rem; font-weight: 250; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.f-slider-readout em{ font-style: normal; font-size: 1.1rem; color: var(--ink-dim); margin-left: 4px; }
.f-item-stage--curve{ background: transparent; border: none; }
.f-curve{ width: 100%; height: auto; }
.f-curve path{
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
}
.f-logo{
  position: absolute; top: 8%; right: 7%;
  width: 132px; height: 132px;
}
.f-logo svg{ width: 100%; height: 100%; animation: spin 16s linear infinite; }
.f-logo text{
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 3.4px;
  fill: var(--accent); opacity: .85;
}
.f-logo-core{
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--accent); font-size: 22px;
  animation: spin 8s linear infinite reverse;
}

/* ============================================================
   ============ 11. 3D 爆炸视图 ============
   ============================================================ */
.ex-inner{ max-width: 1400px; margin: 0 auto; text-align: center; }
.ex-head{
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 16px;
}
.ex-note{
  color: var(--ink-dim); font-size: 15px;
  max-width: 520px; margin: 0 auto 6vh;
}
.ex-stage{
  height: 76vh;
  border-radius: 26px;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 50% 0%, #f9f8f5, #ecebe7 78%);
  overflow: hidden;
}
.explode-canvas{ width: 100%; height: 100%; }

/* ============================================================
   ============ 12. 粘性双栏（Ken Burns + 段落点亮） ============
   ============================================================ */
.section--duo{ padding: 0; }
.duo{
  display: grid; grid-template-columns: 1fr 1fr;
  max-width: 1600px;
  margin: 0 auto;
}
.duo-media{
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  overflow: hidden;
}
.kb{
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 20px;
  background:
    linear-gradient(200deg, rgba(20, 18, 16, .10) 0%, rgba(20, 18, 16, .34) 100%),
    url("assets/images/kb.jpg") center / cover no-repeat,
    linear-gradient(150deg, #f4f3f0, #e5e4df);
  will-change: transform;
}
.kb-word{
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 200;
  letter-spacing: .5em; text-indent: .5em;
  color: rgba(255, 255, 255, .92);
  text-shadow: 0 2px 24px rgba(20, 18, 16, .35);
}
.kb::after{
  content: "✳";
  color: var(--accent);
  font-size: 22px;
  opacity: .8;
}
.duo-copy{
  padding: 16vh clamp(28px, 5vw, 80px);
}
.duo-h2{
  font-size: clamp(2rem, 4.4vw, 3.6rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.18;
  margin-bottom: 8vh;
}
.duo-p{
  min-height: 70vh;
  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
  line-height: 1.75;
  color: var(--ink);
  border-left: 2px solid var(--accent);
  padding-left: 26px;
  margin-bottom: 6vh;
  will-change: opacity;
}

/* ============================================================
   ============ 13. Encryption（翻转卡片） ============
   ============================================================ */
.enc-inner{ max-width: 1400px; margin: 0 auto; text-align: center; }
.enc-h2{
  font-size: clamp(2.6rem, 6.5vw, 5.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.12;
  margin-bottom: 9vh;
}
.enc-scene{ perspective: 1400px; display: flex; justify-content: center; }
.enc-card{
  position: relative;
  width: min(400px, 78vw);
  aspect-ratio: 3 / 4;
  transform-style: preserve-3d;
  will-change: transform;
}
.enc-face{
  position: absolute; inset: 0;
  border-radius: 26px;
  border: 1px solid var(--line);
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px;
  padding: 34px;
  text-align: center;
}
.enc-face--front{ background: linear-gradient(160deg, #faf9f6, #e8e7e3 75%); box-shadow: 0 24px 70px rgba(20,18,16,.08); }
.enc-face--back{
  background: #141210;
  color: #f4f1ec;
  transform: rotateY(180deg);
}
.enc-face--back .enc-face-sub{ color: rgba(244, 241, 236, .55); }
.enc-face-tag{
  position: absolute; top: 20px; left: 24px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .2em;
  color: var(--ink-faint);
}
.enc-face--back .enc-face-tag{ color: rgba(244,241,236,.4); }
.enc-face-big{ font-size: 1.7rem; font-weight: 650; letter-spacing: -.01em; }
.enc-face-sub{ color: var(--ink-dim); font-size: 14px; max-width: 260px; }
.enc-dots{
  width: 160px; height: 64px; margin-top: 10px;
  background-image: radial-gradient(circle, var(--accent) 1.6px, transparent 1.8px);
  background-size: 18px 18px;
  opacity: .8;
}

/* ============================================================
   ============ 14. Grip（放大镜） ============
   ============================================================ */
.grip-inner{ max-width: 1400px; margin: 0 auto; }
.grip-h2{
  font-size: clamp(2.6rem, 6.5vw, 5.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.12;
  margin-bottom: 3vh;
}
.grip-note{ color: var(--ink-dim); font-size: 14px; margin-bottom: 5vh; }
.grip-stage{
  position: relative;
  height: 62vh;
  border-radius: 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  cursor: crosshair;
}
.grip-bg{
  position: absolute; inset: 0;
  background-color: #efeeea;
  background-image:
    radial-gradient(circle at 2.5px 2.5px, #c9c6bd 2.4px, transparent 2.6px),
    radial-gradient(circle at 13px 13px, #d5d2ca 1.8px, transparent 2px);
  background-size: 26px 26px;
}
.grip-bg::after{
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(120% 100% at 50% 50%, transparent 45%, rgba(20, 18, 16, .08) 100%);
}
.grip-lens{
  position: absolute; top: 0; left: 0;
  width: 230px; height: 230px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid #fff;
  box-shadow: 0 24px 70px rgba(20, 18, 16, .28), inset 0 0 0 1px var(--line);
  opacity: 0;
  transform: translate3d(-500px, -500px, 0) scale(.92);
  transition: opacity .35s, scale .35s;
  pointer-events: none;
  z-index: 2;
}
.grip-lens.is-on{ opacity: 1; }
.grip-lens-inner{
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  background-color: #efeeea;
  background-image:
    radial-gradient(circle at 2.5px 2.5px, #b3afa4 2.4px, transparent 2.6px),
    radial-gradient(circle at 13px 13px, #c0bcb2 1.8px, transparent 2px);
  background-size: 62.4px 62.4px; /* 26px × 2.4 放大倍率 */
}

/* ============================================================
   ============ 15. 帧序列（滚动切帧） ============
   ============================================================ */
.section--frames{ padding: 0; height: 260vh; }
.frames-stage{
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 28px;
  background: linear-gradient(180deg, #fff, #f6f5f2);
  padding: 0 5vw;
}
.frames-head{
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 650; letter-spacing: -.02em;
}
.frame-img{
  width: min(820px, 86vw);
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 30px 80px rgba(20, 18, 16, .10);
}
.frames-hint{
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .12em;
  color: var(--ink-faint);
  text-align: center;
}

/* ============================================================
   ============ 16. 视差带 ============
   ============================================================ */
.section--parallax{
  padding: 0;
  height: 130vh;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.parallax-bg{
  position: absolute; inset: -12% 0;
  display: flex; align-items: center; justify-content: center;
  will-change: transform;
}
.parallax-word{
  font-size: 30vw;
  font-weight: 700;
  letter-spacing: -.04em;
  white-space: nowrap;
  background: linear-gradient(180deg, #f1f0ec, #dedcd6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.parallax-copy{
  position: relative; z-index: 1;
  text-align: center;
  padding: 0 6vw;
}
.parallax-copy h2{
  font-size: clamp(1.6rem, 3.6vw, 2.8rem);
  font-weight: 650; letter-spacing: -.02em; line-height: 1.4;
}
.parallax-copy p{
  margin-top: 18px;
  color: var(--ink-dim);
  font-size: 14px;
}

/* ============================================================
   ============ 17. Sustainability ============
   ============================================================ */
.section--sustain{ overflow: hidden; }
.sustain-canvas{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}
.sustain-inner{ position: relative; z-index: 1; max-width: 1400px; margin: 0 auto; }
.sustain-h2{
  font-size: clamp(3rem, 9vw, 7.5rem);
  font-weight: 200; letter-spacing: .02em;
  margin-bottom: 8vh;
}
.sustain-grid{
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 5vw;
}
.sustain-num{
  font-size: clamp(2.6rem, 5.5vw, 4.6rem);
  font-weight: 250; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  margin-bottom: 14px;
}
.sustain-num em{ font-style: normal; font-size: .45em; color: var(--accent); margin-left: 3px; }
.sustain-stat p{ color: var(--ink-dim); font-size: 14px; }
.sustain-stat{ border-top: 1px solid var(--line); padding-top: 22px; }

/* ============================================================
   ============ 18. Testimonies ============
   ============================================================ */
.t-inner{ max-width: 1400px; margin: 0 auto; }
.t-h2{
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 9vh;
}
.t-rows{ border-top: 1px solid var(--line); }
.t-row{
  display: grid;
  grid-template-columns: 150px 1fr 130px;
  gap: 4vw;
  align-items: baseline;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.t-row-name{ font-size: 14px; color: var(--ink); letter-spacing: .04em; }
.t-row-quote{ font-size: clamp(1rem, 1.6vw, 1.2rem); color: var(--ink); }
.t-row-loc{
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em;
  color: var(--ink-faint);
  text-align: right;
}

/* ============================================================
   ============ 19. 时间线 ============
   ============================================================ */
.tl-container{ max-width: 1000px; margin: 0 auto; }
#timeline .sec-head{
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 8vh;
}
.tl-wrap{ position: relative; padding-left: 48px; }
.tl-line{
  position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 2px; background: var(--line);
}
.tl-line-fill{
  display: block; width: 100%; height: 100%;
  background: var(--accent);
  transform: scaleY(0); transform-origin: top;
}
.tl-item{
  position: relative;
  padding: 36px 0;
}
.tl-item::before{
  content: "";
  position: absolute; left: -48px; top: 52px;
  width: 12px; height: 12px;
  /* 显式 border-box：通配 * 不匹配伪元素，否则 2px 边框会把圆撑到 16px、圆心右偏 */
  box-sizing: border-box;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent);
  transform: translateX(-5px);
}
.tl-year{
  font-family: var(--mono);
  font-size: 13px; letter-spacing: .26em;
  color: var(--accent);
  margin-bottom: 10px;
}
.tl-body h3{
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 650; letter-spacing: -.01em;
  margin-bottom: 10px;
}
.tl-body p{ color: var(--ink-dim); font-size: 15px; max-width: 560px; }

/* ============================================================
   ============ 20. Social ============
   ============================================================ */
.social-inner{
  position: relative;
  max-width: 1100px; margin: 0 auto;
  padding-left: 44px;
}
.social-line{
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 1px; background: var(--line);
  overflow: hidden;
}
.social-line-fill{
  display: block; width: 100%; height: 100%;
  background: var(--accent);
  transform: scaleY(0); transform-origin: 0 0;
}
.social-head{
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 6vh;
}
.social-item{
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 4vw;
  align-items: baseline;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.social-item-idx{ font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }
.social-item-tag{
  display: block;
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: 8px;
}
.social-item-body p{ font-size: clamp(1rem, 1.7vw, 1.25rem); color: var(--ink); }
.social-item-likes{ font-family: var(--mono); font-size: 12px; color: var(--ink-dim); }

/* ============================================================
   ============ 21. Product（三档切换） ============
   ============================================================ */
.p-inner{ max-width: 1400px; margin: 0 auto; }
.p-h2{
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1.15;
  margin-bottom: 8vh;
}
.p-stage{
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 6vw; align-items: center;
  margin-bottom: 9vh;
}
.p-rings{
  position: relative;
  width: min(380px, 62vw);
  aspect-ratio: 1;
  margin: 0 auto;
}
.p-ring{ position: absolute; width: 100%; height: 100%; }
.p-ring--a{ animation: spin 26s linear infinite; }
.p-ring--b{ inset: 9%; width: 82%; height: 82%; animation: spin 18s linear infinite reverse; }
.p-ring circle{ fill: none; stroke: var(--accent-dim); }
.p-ring--a circle{ stroke-dasharray: 2 7; stroke-width: 1.2; }
.p-ring--b circle{ stroke-dasharray: 1 10; stroke-width: 1.4; }
.p-img{
  position: absolute; inset: 17%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #2b2723, #161411 72%);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(20, 18, 16, .18);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px;
  color: #f4f1ec;
}
.p-img-brand{
  font-family: var(--mono); font-size: 10px; letter-spacing: .4em; text-indent: .4em;
  color: rgba(244, 241, 236, .5);
}
.p-img-tier{
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 650; letter-spacing: .14em;
}
.p-hero-copy h3{
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 650; letter-spacing: -.01em;
  margin-bottom: 14px;
}
.p-hero-copy p{ color: var(--ink-dim); font-size: 15px; max-width: 420px; margin-bottom: 26px; }
.p-price{
  font-size: 2rem; font-weight: 250; letter-spacing: 0;
  margin-bottom: 30px;
  font-variant-numeric: tabular-nums;
}
.p-switch{
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px;
  margin-bottom: 7vh;
  background: #fff;
}
.p-switch-btn{
  border: none;
  background: transparent;
  color: var(--ink-dim);
  border-radius: 999px;
  padding: 11px 26px;
  font-size: 12px; font-weight: 600; letter-spacing: .14em;
  cursor: pointer;
  transition: background .35s, color .35s;
}
.p-switch-btn.is-active{ background: var(--ink); color: #fff; }
.p-table{ width: 100%; border-collapse: collapse; }
.p-table th, .p-table td{
  padding: 17px 16px;
  text-align: left;
  border-top: 1px solid var(--line);
  font-size: 14px;
  transition: background .4s, color .4s;
}
.p-table thead th{
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .18em;
  font-weight: 500;
  color: var(--ink-faint);
  border-top: none;
}
.p-col.is-active, .p-table td.is-active{ color: var(--accent); }
.p-table td.is-active{ background: var(--accent-soft); }
.p-table-label{
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .14em;
  color: var(--ink-faint) !important;
  width: 160px;
}

/* ============================================================
   ============ 22. Open Weight（bibtex，深色代码块收尾） ============
   ============================================================ */
.ow-inner{ max-width: 1400px; margin: 0 auto; }
.ow-tag{
  font-family: var(--mono); font-size: 11px; letter-spacing: .28em;
  color: var(--accent);
  margin-bottom: 22px;
}
.ow-h2{
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 650; letter-spacing: -.03em; line-height: 1;
  margin-bottom: 20px;
}
.ow-note{ color: var(--ink-dim); font-size: 15px; max-width: 520px; margin-bottom: 6vh; }
.ow-code{
  max-width: 720px;
  border: 1px solid rgba(239, 233, 223, .14);
  border-radius: 16px;
  overflow: hidden;
  background: #100e0c;
  color: #efe9df;
}
.ow-code-bar{
  display: flex; align-items: center; gap: 7px;
  padding: 13px 18px;
  border-bottom: 1px solid rgba(239, 233, 223, .12);
}
.ow-code-dot{ width: 9px; height: 9px; border-radius: 50%; background: #2a241c; }
.ow-code-file{
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  color: rgba(239, 233, 223, .4);
  margin-left: 10px;
}
.ow-copy{
  margin-left: auto;
  border: 1px solid rgba(239, 233, 223, .18);
  background: transparent;
  color: rgba(239, 233, 223, .6);
  border-radius: 8px;
  padding: 5px 13px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em;
  cursor: pointer;
  transition: border-color .3s, color .3s;
}
.ow-copy:hover{ border-color: var(--accent); color: var(--accent); }
.ow-pre{
  padding: 24px 22px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.85;
  color: #cfc6b8;
  white-space: pre;
}

/* ============================================================
   ============ 23. 吸底 CTA 条 ============
   ============================================================ */
.cta-bar{
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 800;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(24px, 4vw, 56px);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--line);
  will-change: transform;
}
.cta-info{
  display: flex; flex-direction: column; gap: 2px;
}
.cta-info strong{ font-size: 14px; letter-spacing: .04em; }
.cta-info span{ font-size: 12px; color: var(--ink-dim); }
.cta-actions{ display: flex; gap: 12px; }

/* ============================================================
   ============ 24. Footer（深色收尾） ============
   ============================================================ */
.section--footer{
  background: var(--ink);
  color: #f4f1ec;
  padding: 22vh clamp(24px, 6vw, 84px) 7vh;
}
.section--footer .text-accent{ color: var(--accent); }
.footer-inner{ max-width: 1400px; margin: 0 auto; }
.footer-title .line{
  display: block;
  overflow: hidden;
  padding-bottom: .06em;
}
.footer-title .line-inner{
  display: block;
  font-size: clamp(2.2rem, 6.5vw, 5.2rem);
  font-weight: 650; letter-spacing: -.025em; line-height: 1.14;
  will-change: transform;
}
.footer-form{
  display: flex; gap: 10px;
  max-width: 540px;
  margin-top: 8vh;
}
.footer-form input{
  flex: 1;
  background: transparent;
  border: 1px solid rgba(239, 233, 223, .2);
  border-radius: 999px;
  padding: 14px 22px;
  color: #f4f1ec;
  font-size: 14px;
  outline: none;
  transition: border-color .3s;
}
.footer-form input:focus{ border-color: var(--accent); }
.footer-form input::placeholder{ color: rgba(239, 233, 223, .35); }
.footer-fine{
  margin-top: 14px;
  font-size: 12px; color: rgba(239, 233, 223, .4);
  max-width: 540px;
}
.footer-bottom{
  margin-top: 16vh;
  padding-top: 26px;
  border-top: 1px solid rgba(239, 233, 223, .16);
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  color: rgba(239, 233, 223, .4);
}
.footer-links{ display: flex; gap: 24px; }
.footer-links a{ color: rgba(239, 233, 223, .6); text-decoration: none; transition: color .3s; }
.footer-links a:hover{ color: var(--accent); }

/* ============================================================
   ============ 25. 视频弹层 + 自定义光标（保持深色电影感） ============
   ============================================================ */
.overlay{
  position: fixed; inset: 0; z-index: 1500;
  background: rgba(8, 7, 6, .94);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .45s var(--ease-out);
}
.overlay.is-open{ opacity: 1; pointer-events: auto; cursor: none; }
.overlay-stage{ width: min(1080px, 88vw); }
#overlay-video{
  width: 100%;
  max-height: 76vh;
  object-fit: contain;
  border-radius: 14px;
  background: #000;
}
#overlay-video[hidden]{ display: none; }
.overlay-missing{
  border: 1px dashed rgba(239, 233, 223, .3);
  border-radius: 14px;
  padding: 14vh 8vw;
  text-align: center;
  color: rgba(239, 233, 223, .6);
  font-family: var(--mono); font-size: 13px; letter-spacing: .08em;
}
.overlay-caption{
  margin-top: 16px;
  text-align: center;
  color: rgba(239, 233, 223, .6);
  font-size: 13px; letter-spacing: .08em;
  min-height: 1.4em;
}
.overlay-close{
  position: absolute; top: 26px; right: 30px;
  width: 54px; height: 54px;
  border-radius: 50%;
  border: 1px solid rgba(239, 233, 223, .2);
  background: transparent;
  color: #efe9df;
  font-size: 17px;
  display: flex; align-items: center; justify-content: center;
  cursor: none;
  transition: border-color .3s, transform .3s var(--ease-out);
}
.overlay-close:hover{ border-color: #efe9df; transform: rotate(90deg); }

.cursor{
  position: fixed; left: 0; top: 0;
  width: 44px; height: 44px;
  margin: -22px 0 0 -22px;
  border: 1.5px solid rgba(255,255,255,.75);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
  opacity: 0;
  z-index: 9999;
  transition: width .3s var(--ease-out), height .3s var(--ease-out),
    margin .3s var(--ease-out), border-color .3s, background .3s;
  will-change: transform;
}
.cursor.is-on{ opacity: 1; }
.cursor--play{ width: 88px; height: 88px; margin: -44px 0 0 -44px; border-color: var(--accent); }
.cursor--close{ width: 22px; height: 22px; margin: -11px 0 0 -11px; background: var(--red); border-color: var(--red); }
.cursor-glyph{ font-size: 15px; color: #fff; }

/* 触屏：不用自定义光标 */
@media (pointer: coarse){
  .cursor{ display: none; }
  .overlay.is-open{ cursor: auto; }
  .overlay-close{ cursor: pointer; }
  .grip-stage{ cursor: default; }
}

/* ---------- Toast ---------- */
.toast{
  position: fixed; left: 50%; bottom: 34px;
  transform: translateX(-50%) translateY(16px);
  background: var(--ink);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 13px; letter-spacing: .04em;
  color: #f4f1ec;
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s, transform .35s var(--ease-out);
  z-index: 3000;
  max-width: 86vw;
  text-align: center;
}
.toast.is-on{ opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px){
  /* 主导航窄屏紧凑模式（它是唯一导航，不再隐藏） */
  #nav{ padding: 0 20px; }
  .nav-logo-img{ height: 22px; }
  .nav-links{ gap: 18px; }
  .nav-links a{ font-size: 14px; letter-spacing: .06em; }
  .nav-auth{ gap: 10px; }
  .nav-auth .btn--accent{ display: none; }
  .ai-inner{ grid-template-columns: 1fr; gap: 6vh; }
  .f-item{ grid-template-columns: 1fr; min-height: auto; gap: 5vh; padding: 7vh 0; }
  .f-item--flip .f-item-copy{ order: 1; }
  .f-item--flip .f-item-stage{ order: 2; }
  .f-item-stage{ height: 46vh; }
  .sustain-grid{ grid-template-columns: 1fr; gap: 7vh; }
  .p-stage{ grid-template-columns: 1fr; gap: 8vh; }
  .p-table{ display: block; overflow-x: auto; }
  .t-row{ grid-template-columns: 1fr; gap: 4px; }
  .t-row-loc{ text-align: left; }
  .g-card{ width: 78vw; }
  .g-card--wide{ width: 82vw; }
  .g-card-media{ height: 150px; }
  .g-card-no{ padding: 4px 10px; font-size: 10px; }
  .g-card-body p{ min-height: 0; }
  .f-logo{ width: 96px; height: 96px; top: 4%; right: 4%; }
  .grip-lens{ width: 170px; height: 170px; }
  .hero-hint{ display: none; }
  .mq-half{ font-size: 11px; letter-spacing: .2em; gap: 2em; padding-right: 2em; }
  .spec-grid{ grid-template-columns: 1fr 1fr; }
  .duo{ grid-template-columns: 1fr; }
  .duo-media{ position: relative; height: 50vh; }
  .duo-p{ min-height: 0; font-size: 1rem; }
  .duo-copy{ padding: 10vh 6vw; }
  .frame-img{ width: 86vw; }
  .parallax-word{ font-size: 40vw; }
  .ex-stage{ height: 58vh; }
  .ch-layer h2{ margin-bottom: 14px; }
  .ch-layer p{ font-size: 13px; }
  .tl-wrap{ padding-left: 32px; }
  .tl-item::before{ left: -32px; transform: translateX(-5px); top: 46px; } /* -5 与大屏一致：线心 1px，圆心 6-5=1px */
  .cta-bar{ flex-direction: column; align-items: flex-start; gap: 12px; }
  .cta-info span{ display: inline; margin-left: 8px; }
}

/* ---------- 降低动态效果 ---------- */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: .001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001s !important;
  }
}