/* ============================================================
   维特尔液冷 VITERN — 设计系统
   近黑深蓝工业基底 · 单色克制 UI · 红蓝仅用于冷却液
   ============================================================ */

:root {
  /* 色板 */
  --bg: #04070D;
  --bg-alt: #060B14;
  --panel: #0A1220;
  --panel-2: #0D1626;
  --line: rgba(148, 178, 224, 0.10);
  --line-strong: rgba(148, 178, 224, 0.22);
  --text: #EAF0F8;
  --text-dim: #B2BED0;
  --text-mute: #7E8CA3;
  --cold: #4DA3FF;
  --cold-glow: #6FD4FF;
  --hot: #FF4D4A;
  --hot-glow: #FF8A6B;
  --facility: #3ECFB2;

  /* 字体 */
  --font-sans: -apple-system, "SF Pro Display", "SF Pro SC", "PingFang SC",
    "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Roboto Mono",
    Menlo, Consolas, monospace;

  /* 节奏 */
  --container: 1280px;
  --container-wide: 1440px;
  --gutter: clamp(20px, 4vw, 48px);
  /* 2026-08 收紧:原 clamp(96px,12vw,180px) 相邻区块叠加 360px,大屏一屏皆空 */
  --section-gap: clamp(72px, 8vw, 120px);
  --radius-lg: 24px;
  --radius-md: 14px;

  /* 首屏视频与文字可读性 */
  --hero-copy-width: min(72vw, 1120px);
  --hero-title-size: clamp(58px, 6.15vw, 108px);
  --hero-visual-width: min(64vw, 1100px);
  --hero-height: clamp(720px, 90svh, 1040px);
  --hero-shade-left: rgba(2, 6, 12, 0.88);
  --hero-shade-middle: rgba(2, 6, 12, 0.58);
  --hero-shade-right: rgba(2, 6, 12, 0.18);
  --hero-glass: rgba(7, 12, 20, 0.34);
  --hero-glass-scrolled: rgba(4, 8, 14, 0.76);
  --hero-glass-line: rgba(226, 239, 255, 0.18);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  /* 中文正文:行距 1.85、字距 +0.01em。方块字满字身,拉丁的 1.6/0 字距
     在中文下会显得挤。英文态在 [lang="en"] 收回拉丁值。 */
  line-height: 1.85;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 胶片颗粒,统一质感 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  opacity: 0.03;
  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='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: rgba(77, 163, 255, 0.35); color: #fff; }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, canvas { display: block; max-width: 100%; }

:focus-visible {
  outline: 2px solid var(--cold-glow);
  outline-offset: 4px;
}

main [id] { scroll-margin-top: 88px; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container-wide { max-width: var(--container-wide); }

.section { padding-top: var(--section-gap); padding-bottom: var(--section-gap); }
.section-alt {
  background:
    linear-gradient(180deg, rgba(148, 178, 224, 0.03), rgba(148, 178, 224, 0) 240px),
    var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ---------- 文字体系 ---------- */
.eyebrow {
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--text-mute);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
  text-transform: uppercase;
}
/* 眉标:纯文字标签,不带编号方括号与尾部拖线 */

/* 中文标题基线。CJK 是满字身方块,负字距会让笔画相撞、行高 <1.2 会贴行,
   所以基线走"中性字距 + 舒展行高 + 中等字重";拉丁的紧排在 [lang="en"] 里给。 */
.display {
  /* 下限 26px:375px 窄屏下中文标题单行最多约 12 字,30px 会溢出到额外折行 */
  font-size: clamp(26px, 4.6vw, 58px);
  line-height: 1.34;
  font-weight: 550;
  letter-spacing: 0.018em;
  text-wrap: balance;
}
.display-lg { font-size: clamp(36px, 5.8vw, 76px); }

.section-head { margin-bottom: clamp(36px, 4.5vw, 60px); max-width: 860px; }
/* 两栏区块头:标题左,一句引导右(对齐基线),右半不再空场 */
.section-head-split {
  display: grid;
  max-width: none;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 1fr);
  gap: clamp(24px, 4vw, 72px);
  align-items: end;
}
.section-head-split .head-lead {
  max-width: 40ch;
  justify-self: end;
  padding-bottom: 6px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}
[lang="en"] .section-head-split .head-lead { line-height: 1.65; }
@media (max-width: 900px) {
  .section-head-split { grid-template-columns: 1fr; }
  .section-head-split .head-lead { justify-self: start; padding-bottom: 0; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 14px 28px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: background 0.18s, border-color 0.18s, color 0.18s;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--text);
  color: #05080F;
}
.btn-primary:hover { background: #fff; }
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover { border-color: rgba(200, 220, 255, 0.5); }
.btn-sm { padding: 9px 18px; font-size: 13px; border-radius: 7px; }
.btn-lg { padding: 18px 40px; font-size: 17px; }
.btn-arrow { transition: transform 0.35s var(--ease-out); }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(4, 7, 13, 0.72);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  backdrop-filter: blur(18px) saturate(1.4);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px;
  height: 42px;
  padding: 5px;
  flex: none;
  box-sizing: border-box;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(77, 163, 255, 0.08),
    0 6px 18px rgba(25, 126, 230, 0.22);
  transition: background-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.brand:hover .brand-mark {
  background: #fff;
  box-shadow:
    0 0 0 1px rgba(77, 163, 255, 0.16),
    0 8px 24px rgba(25, 126, 230, 0.32);
  transform: translateY(-1px);
}
.brand-cn { font-size: 17px; font-weight: 600; letter-spacing: 0.06em; }
.brand-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-mute);
  padding-left: 12px;
  border-left: 1px solid var(--line-strong);
}
.nav-links { display: flex; gap: clamp(20px, 2.6vw, 36px); }
.nav-links a {
  font-size: 15px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  transition: color 0.25s;
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.is-active { color: var(--text); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}
.nav-links a:hover::after,
.nav-links a.is-active::after { transform: scaleX(1); }
.nav-links a[aria-current="location"]::after { background: var(--cold-glow); }
.nav-actions { display: flex; align-items: center; gap: 16px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px; height: 40px;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  cursor: pointer;
  padding: 0 9px;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
}
.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 12px var(--gutter) 28px;
  background: rgba(4, 7, 13, 0.96);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-mobile a {
  padding: 14px 0;
  font-size: 17px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--line);
}
.nav-mobile a:last-child { border-bottom: none; }
.nav-mobile a.is-active { color: var(--text); }
.nav.open .nav-mobile { display: flex; }
.nav.open { background: rgba(4, 7, 13, 0.96); border-bottom-color: var(--line); }
.nav.open .nav-toggle span:first-child { transform: translateY(3.75px) rotate(45deg); }
.nav.open .nav-toggle span:last-child { transform: translateY(-3.75px) rotate(-45deg); }

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: clamp(18px, 2.5vw, 34px);
  bottom: clamp(18px, 2.5vw, 34px);
  z-index: 90;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(4, 7, 13, 0.78);
  color: var(--text);
  font: 18px/1 var(--font-mono);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s, visibility 0.25s, transform 0.35s var(--ease-out), border-color 0.25s;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.back-to-top:hover { border-color: rgba(111, 212, 255, 0.7); transform: translateY(-2px); }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 112px;
  padding-bottom: 56px;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(3, 7, 14, 0.98) 0%, rgba(3, 7, 14, 0.94) 31%, rgba(3, 7, 14, 0.82) 50%, rgba(3, 7, 14, 0.32) 68%, rgba(3, 7, 14, 0.08) 82%, rgba(3, 7, 14, 0.12) 100%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, transparent 70%, var(--bg) 100%);
  pointer-events: none;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background:
    radial-gradient(circle at 76% 47%, rgba(15, 71, 148, 0.22), transparent 30%),
    radial-gradient(ellipse at 70% 115%, rgba(20, 100, 218, 0.15), transparent 42%),
    linear-gradient(135deg, #02050a 0%, #050b16 52%, #020610 100%);
}
.hero-media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(93, 153, 226, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 153, 226, 0.055) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: radial-gradient(circle at 73% 48%, #000, transparent 58%);
}
.hero-cad {
  --cad-x: 0px;
  --cad-y: 0px;
}
.hero-cad-stage {
  position: absolute;
  inset: -10px;
  transform: translate3d(var(--cad-x), var(--cad-y), 0) scale(1.018);
  transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
  contain: layout paint;
  backface-visibility: hidden;
}
.hero-cad-image {
  position: absolute;
  top: 52%;
  right: -1.5vw;
  width: var(--hero-visual-width);
  height: auto;
  max-width: none;
  object-fit: contain;
  object-position: center;
  user-select: none;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.94;
  -webkit-mask-image: radial-gradient(ellipse 78% 56% at 60% 50%, #000 0%, #000 46%, rgba(0, 0, 0, 0.96) 60%, rgba(0, 0, 0, 0.58) 78%, transparent 100%);
  mask-image: radial-gradient(ellipse 78% 56% at 60% 50%, #000 0%, #000 46%, rgba(0, 0, 0, 0.96) 60%, rgba(0, 0, 0, 0.58) 78%, transparent 100%);
  transform: translate3d(0, -50%, 0);
  transform-origin: 64% 50%;
  animation: cad-camera 15s 2.2s ease-in-out infinite alternate both;
  will-change: transform;
  backface-visibility: hidden;
}
.hero-cad-reveal {
  position: absolute;
  inset: 0;
  overflow: hidden;
  opacity: 0;
  animation: cad-build 1.25s 0.18s var(--ease-out) forwards;
}
.hero-cad-scan {
  position: absolute;
  z-index: 3;
  top: 4%;
  bottom: 4%;
  left: 100%;
  width: 120px;
  opacity: 0;
  background: linear-gradient(90deg, transparent, rgba(123, 222, 255, 0.1) 38%, rgba(196, 246, 255, 0.72) 50%, rgba(68, 157, 255, 0.11) 62%, transparent);
  transform: translate3d(0, 0, 0);
  animation: cad-scan 7.2s 2.4s cubic-bezier(0.22, 0.61, 0.36, 1) infinite;
  will-change: transform, opacity;
  pointer-events: none;
}
.hero-cad-focus {
  position: absolute;
  z-index: 3;
  left: 56%;
  top: 18%;
  width: clamp(140px, 17vw, 280px);
  height: clamp(92px, 19vh, 180px);
  overflow: hidden;
  border: 1px solid rgba(142, 222, 255, 0.52);
  background:
    linear-gradient(#bdefff, #bdefff) 0 0 / 28px 2px no-repeat,
    linear-gradient(#bdefff, #bdefff) 0 0 / 2px 28px no-repeat,
    linear-gradient(#bdefff, #bdefff) 100% 100% / 28px 2px no-repeat,
    linear-gradient(#bdefff, #bdefff) 100% 100% / 2px 28px no-repeat,
    rgba(18, 91, 151, 0.07);
  box-shadow:
    0 0 0 1px rgba(74, 177, 255, 0.08),
    inset 0 0 34px rgba(48, 155, 238, 0.1),
    0 0 26px rgba(50, 160, 245, 0.16);
  opacity: 0;
  transform: translate3d(0, 0, 0);
  animation: cad-focus-tour 12s 2.3s ease-in-out infinite;
  will-change: transform, opacity;
  pointer-events: none;
}
.hero-cad-focus::before {
  content: "GEOMETRY SCAN / LIVE";
  position: absolute;
  z-index: 2;
  left: 10px;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.12em;
  color: rgba(196, 240, 255, 0.86);
  text-shadow: 0 0 10px rgba(89, 191, 255, 0.5);
}
.hero-cad-focus::after {
  content: "";
  position: absolute;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 34%;
  background: linear-gradient(180deg, transparent, rgba(109, 210, 255, 0.15) 72%, rgba(202, 245, 255, 0.74) 96%, transparent);
  transform: translate3d(0, -110%, 0);
  animation: cad-focus-line 2.4s ease-in-out infinite;
  will-change: transform;
}
.hero-cad-node {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  color: rgba(184, 222, 255, 0.52);
  opacity: 0;
  animation: cad-node-cycle 7.2s linear infinite;
}
.hero-cad-node i {
  position: relative;
  width: 6px;
  height: 6px;
  border: 1px solid rgba(159, 228, 255, 0.85);
  border-radius: 50%;
  background: rgba(81, 172, 255, 0.72);
  box-shadow: 0 0 12px rgba(66, 169, 255, 0.82);
}
.hero-cad-node i::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px solid rgba(103, 191, 255, 0.4);
  border-radius: 50%;
  animation: cad-node-ring 1.8s ease-out infinite;
}
.hero-cad-node-a { left: 57%; top: 29%; animation-delay: 2.8s; }
.hero-cad-node-b { left: 72%; top: 51%; animation-delay: 4.6s; }
.hero-cad-node-c { left: 87%; top: 67%; animation-delay: 6.4s; }
.hero-cad-status {
  position: absolute;
  z-index: 4;
  right: clamp(26px, 4vw, 68px);
  bottom: 44px;
  display: grid;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid rgba(111, 212, 255, 0.42);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: rgba(158, 196, 232, 0.48);
  opacity: 0;
  animation: cad-status-in 0.7s 2.25s var(--ease-out) forwards;
}
.hero-cad-status b {
  color: rgba(133, 219, 255, 0.8);
  font-weight: 400;
}
.hero-cad-status::after {
  content: "";
  width: 168px;
  height: 1px;
  margin-top: 3px;
  background: linear-gradient(90deg, rgba(111, 212, 255, 0.85), rgba(111, 212, 255, 0.08));
  transform: scaleX(0.08);
  transform-origin: left;
  animation: cad-progress 4.8s 2.6s ease-in-out infinite;
}
@keyframes cad-build {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes cad-camera {
  from { transform: translate3d(0, -50%, 0) scale(1); }
  to { transform: translate3d(-0.7%, -50.35%, 0) scale(1.026); }
}
@keyframes cad-scan {
  0%, 20% { transform: translate3d(0, 0, 0); opacity: 0; }
  23% { opacity: 0.72; }
  52% { transform: translate3d(-72vw, 0, 0); opacity: 0.36; }
  58%, 100% { transform: translate3d(-78vw, 0, 0); opacity: 0; }
}
@keyframes cad-focus-tour {
  0%, 7% { opacity: 0; transform: translate3d(0, 0, 0) scale(0.94); }
  12%, 30% { opacity: 0.9; transform: translate3d(0, 0, 0) scale(1); }
  40%, 59% { opacity: 0.78; transform: translate3d(13vw, 23vh, 0) scale(0.84); }
  69%, 87% { opacity: 0.82; transform: translate3d(23vw, 40vh, 0) scale(0.7); }
  95%, 100% { opacity: 0; transform: translate3d(23vw, 40vh, 0) scale(0.7); }
}
@keyframes cad-focus-line {
  0%, 12% { transform: translate3d(0, -110%, 0); opacity: 0; }
  22% { opacity: 1; }
  82% { opacity: 0.78; }
  100% { transform: translate3d(0, 315%, 0); opacity: 0; }
}
@keyframes cad-node-cycle {
  0%, 8% { opacity: 0; transform: translateY(4px); }
  13%, 27% { opacity: 1; transform: none; }
  34%, 100% { opacity: 0; transform: none; }
}
@keyframes cad-node-ring {
  from { opacity: 0.8; transform: scale(0.55); }
  to { opacity: 0; transform: scale(1.45); }
}
@keyframes cad-status-in {
  to { opacity: 1; }
}
@keyframes cad-progress {
  0%, 12% { transform: scaleX(0.08); opacity: 0.35; }
  58%, 74% { transform: scaleX(1); opacity: 0.9; }
  100% { transform: scaleX(0.08); opacity: 0.35; }
}
.hero-aperture-type {
  position: absolute;
  z-index: 0;
  right: -0.04em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-sans);
  font-size: clamp(92px, 12.8vw, 230px);
  font-weight: 760;
  line-height: 0.78;
  letter-spacing: -0.075em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(139, 194, 255, 0.105);
  text-align: right;
  white-space: nowrap;
  user-select: none;
}
.hero-aperture {
  position: absolute;
  z-index: 2;
  top: 10vh;
  right: clamp(110px, 15vw, 280px);
  width: clamp(170px, 18vw, 310px);
  height: min(75vh, 760px);
  min-height: 500px;
  border: 1px solid rgba(126, 187, 255, 0.23);
  border-top-color: rgba(196, 229, 255, 0.38);
  background: linear-gradient(90deg, rgba(4, 12, 27, 0.92), rgba(4, 22, 52, 0.54) 48%, rgba(2, 8, 20, 0.95));
  box-shadow:
    0 30px 100px rgba(0, 0, 0, 0.58),
    inset 0 0 60px rgba(29, 102, 205, 0.08);
  transform: perspective(900px) rotateY(-7deg);
  transform-origin: center right;
  pointer-events: none;
}
.hero-aperture::before,
.hero-aperture::after {
  content: "";
  position: absolute;
  top: -1px;
  bottom: -1px;
  width: 8px;
  border: 1px solid rgba(126, 188, 255, 0.14);
  background: linear-gradient(180deg, rgba(50, 119, 211, 0.14), rgba(3, 10, 24, 0.72));
}
.hero-aperture::before { left: -18px; }
.hero-aperture::after { right: -18px; }
.hero-aperture-inner {
  position: absolute;
  inset: 26px;
  border: 1px solid rgba(129, 191, 255, 0.12);
  background:
    linear-gradient(90deg, transparent 49.6%, rgba(151, 216, 255, 0.11) 49.8%, rgba(151, 216, 255, 0.11) 50.2%, transparent 50.4%),
    linear-gradient(180deg, rgba(8, 28, 63, 0.18), rgba(1, 5, 13, 0.72));
}
.hero-aperture-slit {
  position: absolute;
  z-index: 2;
  top: 5%;
  bottom: 5%;
  left: 50%;
  width: 5px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, #b9f1ff 16%, #48b6ff 50%, #1875ff 84%, transparent);
  box-shadow:
    0 0 12px rgba(132, 226, 255, 0.95),
    0 0 38px rgba(44, 148, 255, 0.72),
    0 0 100px rgba(31, 102, 255, 0.42);
  animation: aperture-breathe 6s ease-in-out infinite alternate;
}
.hero-aperture > span {
  position: absolute;
  z-index: 3;
  left: 18px;
  bottom: 18px;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.16em;
  color: rgba(178, 217, 255, 0.48);
}
.hero-aperture-beam {
  position: absolute;
  z-index: 1;
  right: 0;
  bottom: -10vh;
  width: min(58vw, 940px);
  height: 46vh;
  clip-path: polygon(42% 0, 58% 0, 100% 100%, 0 100%);
  background: linear-gradient(180deg, rgba(91, 195, 255, 0.19), rgba(31, 113, 255, 0.04) 70%, transparent);
  filter: blur(13px);
  opacity: 0.78;
  pointer-events: none;
}
.hero-aperture-axis {
  position: absolute;
  z-index: 3;
  top: 23vh;
  right: clamp(26px, 4vw, 70px);
  display: grid;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  color: rgba(168, 205, 246, 0.42);
  text-align: right;
}
.hero-aperture-axis span {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}
.hero-aperture-axis b {
  color: rgba(111, 212, 255, 0.72);
  font-weight: 400;
}
@keyframes aperture-breathe {
  to { opacity: 0.72; box-shadow: 0 0 10px rgba(132, 226, 255, 0.8), 0 0 28px rgba(44, 148, 255, 0.52), 0 0 74px rgba(31, 102, 255, 0.3); }
}
.hero-poster-word {
  position: absolute;
  z-index: 0;
  right: -2.5vw;
  bottom: 7vh;
  font-family: var(--font-sans);
  font-size: clamp(150px, 20vw, 360px);
  font-weight: 760;
  line-height: 0.8;
  letter-spacing: -0.065em;
  color: rgba(8, 19, 36, 0.52);
  -webkit-text-stroke: 1px rgba(136, 190, 255, 0.11);
  opacity: 0.82;
  user-select: none;
  white-space: nowrap;
}
.hero-depth-slab {
  position: absolute;
  z-index: 0;
  top: 13vh;
  right: clamp(30px, 5vw, 96px);
  width: clamp(300px, 31vw, 520px);
  height: min(72vh, 720px);
  min-height: 480px;
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
  pointer-events: none;
}
.hero-depth-slab-a {
  border: 1px solid rgba(55, 141, 255, 0.2);
  background: linear-gradient(150deg, rgba(15, 66, 136, 0.42), rgba(3, 14, 34, 0.08));
  transform: translate(6%, 1%) rotate(-2deg);
}
.hero-depth-slab-b {
  border: 1px solid rgba(89, 184, 255, 0.18);
  background: linear-gradient(150deg, rgba(28, 125, 231, 0.2), rgba(3, 15, 38, 0.06));
  transform: translate(-7%, 4%) rotate(8deg);
}
.hero-thermal-plane {
  position: absolute;
  z-index: 1;
  top: 11vh;
  right: clamp(44px, 7vw, 132px);
  width: clamp(300px, 31vw, 520px);
  height: min(72vh, 720px);
  min-height: 480px;
  overflow: hidden;
  padding: clamp(26px, 3vw, 48px);
  border: 1px solid rgba(133, 195, 255, 0.26);
  border-top-color: rgba(214, 241, 255, 0.48);
  background:
    linear-gradient(145deg, rgba(107, 195, 255, 0.2), transparent 26%),
    linear-gradient(180deg, rgba(12, 71, 153, 0.96), rgba(3, 24, 59, 0.92) 60%, rgba(2, 10, 24, 0.98));
  box-shadow:
    -24px 34px 90px rgba(0, 0, 0, 0.5),
    0 0 80px rgba(25, 115, 232, 0.16),
    inset 0 1px rgba(255, 255, 255, 0.18);
  transform: rotate(4.5deg);
  transform-origin: 50% 60%;
  pointer-events: none;
}
.hero-thermal-plane::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(180deg, transparent 0 54px, rgba(141, 204, 255, 0.11) 55px, transparent 56px),
    linear-gradient(90deg, transparent 64%, rgba(187, 229, 255, 0.075) 64.2%, transparent 64.4%);
  opacity: 0.72;
}
.hero-thermal-plane::after {
  content: "";
  position: absolute;
  inset: -40% -70%;
  background: linear-gradient(112deg, transparent 42%, rgba(210, 242, 255, 0.14) 49%, rgba(110, 195, 255, 0.04) 54%, transparent 61%);
  transform: translateX(8%);
}
.hero-plane-kicker {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: rgba(223, 244, 255, 0.7);
}
.hero-plane-head {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}
.hero-plane-head img {
  width: clamp(34px, 3vw, 50px);
  height: auto;
  filter: grayscale(1) brightness(3.2);
  opacity: 0.82;
}
.hero-plane-spectrum {
  position: absolute;
  z-index: 1;
  top: 24%;
  right: 9%;
  width: 48%;
  height: 34%;
  display: flex;
  align-items: flex-end;
  gap: clamp(7px, 0.75vw, 12px);
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(185, 226, 255, 0.24);
}
.hero-plane-spectrum span {
  flex: 1;
  min-width: 4px;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(180deg, rgba(183, 238, 255, 0.92), rgba(47, 149, 255, 0.2));
  box-shadow: 0 0 18px rgba(70, 176, 255, 0.13);
}
.hero-plane-spectrum span:nth-child(1) { height: 28%; opacity: 0.42; }
.hero-plane-spectrum span:nth-child(2) { height: 46%; opacity: 0.52; }
.hero-plane-spectrum span:nth-child(3) { height: 66%; opacity: 0.66; }
.hero-plane-spectrum span:nth-child(4) { height: 92%; }
.hero-plane-spectrum span:nth-child(5) { height: 74%; opacity: 0.78; }
.hero-plane-spectrum span:nth-child(6) { height: 54%; opacity: 0.6; }
.hero-plane-spectrum span:nth-child(7) { height: 36%; opacity: 0.44; }
.hero-thermal-plane strong {
  position: absolute;
  left: clamp(26px, 3vw, 48px);
  bottom: clamp(28px, 4vw, 64px);
  z-index: 1;
  font-size: clamp(56px, 5.8vw, 96px);
  font-weight: 720;
  line-height: 0.82;
  letter-spacing: -0.07em;
  color: rgba(229, 247, 255, 0.95);
  text-shadow: 0 8px 30px rgba(0, 24, 66, 0.42);
}
.hero-thermal-plane i {
  position: absolute;
  z-index: 1;
  top: clamp(68px, 8vh, 92px);
  left: clamp(26px, 3vw, 48px);
  width: 42px;
  height: 3px;
  background: #8fe7ff;
  box-shadow: 0 0 20px rgba(64, 180, 255, 0.65);
}
.hero-plane-route {
  position: absolute;
  z-index: 2;
  right: clamp(22px, 2.3vw, 38px);
  bottom: clamp(26px, 3vw, 48px);
  display: grid;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 8px;
  line-height: 1;
  letter-spacing: 0.12em;
  color: rgba(208, 235, 255, 0.66);
  text-align: right;
}
.hero-plane-route b {
  margin-right: 8px;
  color: rgba(139, 212, 255, 0.42);
  font-weight: 400;
}
.hero-poster-index {
  position: absolute;
  right: clamp(20px, 2.7vw, 48px);
  top: 18vh;
  z-index: 2;
  display: grid;
  gap: 12px;
  justify-items: end;
  color: rgba(167, 207, 255, 0.46);
  font-family: var(--font-mono);
  text-align: right;
}
.hero-poster-index b {
  font-size: 42px;
  line-height: 1;
  font-weight: 300;
  letter-spacing: -0.04em;
}
.hero-poster-index span {
  font-size: 8px;
  line-height: 1.55;
  letter-spacing: 0.17em;
}
.hero-capability-rail {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(133, 178, 229, 0.18);
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 8px;
  line-height: 1;
  letter-spacing: 0.13em;
  color: rgba(159, 196, 235, 0.55);
}
.hero-capability-rail span {
  border-left: 1px solid rgba(133, 178, 229, 0.16);
  padding-left: 14px;
}
.hero-capability-rail span:first-child { border-left: 0; padding-left: 0; }
.hero-capability-rail b {
  margin-right: 9px;
  color: rgba(111, 212, 255, 0.72);
  font-weight: 400;
}
.hero-media-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  pointer-events: none;
}
.hero-ai-disclosure {
  position: absolute;
  left: clamp(24px, 4vw, 64px);
  bottom: 18px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: rgba(200, 220, 245, 0.46);
}
.hero-fluid-motion {
  position: absolute;
  right: -4%;
  bottom: 2%;
  width: 58%;
  height: 38%;
  transform: rotate(16deg);
  filter: blur(1px);
  mask-image: linear-gradient(90deg, transparent 2%, #000 22%, #000 78%, transparent 98%);
  opacity: 0.72;
}
.hero-fluid-motion i {
  position: absolute;
  left: -30%;
  width: 34%;
  height: 3px;
  border-radius: 50%;
  background: linear-gradient(90deg, transparent, rgba(197, 244, 255, 0.95), #4da3ff, transparent);
  box-shadow: 0 0 12px rgba(77, 163, 255, 0.9), 0 0 28px rgba(77, 163, 255, 0.48);
  animation: coolant-sweep 3.8s linear infinite;
}
.hero-fluid-motion i:nth-child(1) { top: 34%; }
.hero-fluid-motion i:nth-child(2) { top: 49%; animation-delay: -1.25s; opacity: 0.78; }
.hero-fluid-motion i:nth-child(3) { top: 63%; animation-delay: -2.5s; opacity: 0.58; }
@keyframes coolant-sweep { to { transform: translateX(390%); } }
.hero-grid {
  display: block;
  position: relative;
  z-index: 1;
}
.hero-title {
  max-width: none;
  font-size: var(--hero-title-size);
  line-height: 1.1;
  font-weight: 500;
  letter-spacing: 0.015em;
}
.hero-title-line {
  display: block;
  width: 100%;
  white-space: nowrap;
}
.hero-title-line + .hero-title-line {
  margin-top: 0.12em;
}
.hero-title em {
  color: #8bdcff;
  font-style: normal;
  text-shadow: 0 0 32px rgba(50, 164, 255, 0.28);
}
.hero-copy {
  position: relative;
  z-index: 2;
  width: var(--hero-copy-width);
  padding: clamp(30px, 4vh, 54px) 0;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.62);
}
.hero-sub {
  font-size: clamp(17px, 1.35vw, 20px);
  line-height: 1.95;
  color: var(--text-dim);
  max-width: 48ch;
  margin-top: clamp(34px, 4.4vh, 48px);
}
.hero-signature {
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.15em;
  color: rgba(172, 211, 255, 0.76);
  text-transform: uppercase;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 42px; }
.hero-flow-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 500px;
  margin-top: 30px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  color: var(--cold-glow);
}
.hero-flow-summary i {
  position: relative;
  flex: 1;
  min-width: 18px;
  height: 1px;
  overflow: hidden;
  background: rgba(111, 212, 255, 0.24);
}
.hero-flow-summary i::after {
  content: "";
  position: absolute;
  width: 45%;
  height: 1px;
  background: linear-gradient(90deg, transparent, #6fd4ff, transparent);
  animation: flow-summary 2.1s linear infinite;
}
@keyframes flow-summary { from { transform: translateX(-120%); } to { transform: translateX(260%); } }

/* ---------- 等距堆叠动画 ---------- */
.hero-stack {
  position: relative;
  min-width: 0;
}
.stack-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 3px 13px;
  border-bottom: 1px solid rgba(148, 178, 224, 0.14);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--text-mute);
}
.stack-head-state { color: var(--cold-glow); }
.stack-head-state i {
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 7px;
  border-radius: 50%;
  background: #6fd4ff;
  box-shadow: 0 0 10px rgba(111, 212, 255, 0.9);
  animation: system-pulse 1.6s ease-in-out infinite;
}
@keyframes system-pulse { 50% { opacity: 0.35; box-shadow: 0 0 3px rgba(111, 212, 255, 0.3); } }
.stack-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 10 / 11;
  max-height: min(68vh, 680px);
  margin: 0 auto;
}
.stack-wrap::before {
  /* 堆叠后方氛围辉光 */
  content: "";
  position: absolute;
  inset: -8%;
  background: radial-gradient(52% 46% at 52% 46%, rgba(63, 130, 220, 0.12), transparent 70%);
  pointer-events: none;
}
.stack-wrap canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.stack-path {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 16px;
}
.sp-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 7px 10px;
  cursor: pointer;
  transition: color 0.3s, border-color 0.3s, background 0.3s;
  white-space: nowrap;
}
.sp-item i {
  font-style: normal;
  color: var(--text-mute);
  transition: color 0.3s;
}
.sp-item::after {
  content: "→";
  margin-left: 9px;
  color: var(--text-mute);
  opacity: 0.5;
}
.sp-item:last-child::after { content: none; }
.sp-item:hover { color: var(--text-dim); }
.sp-item.is-active {
  color: var(--text);
  border-color: var(--line);
  background: rgba(148, 178, 224, 0.05);
}
.sp-item.is-active i { color: var(--cold-glow); }

/* ---------- 四层液冷架构 ---------- */
.architecture {
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(148, 178, 224, 0.1);
}
.architecture::before {
  content: "";
  position: absolute;
  left: 52%;
  top: 12%;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 163, 255, 0.09), transparent 68%);
  pointer-events: none;
}
.architecture-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(460px, 1.28fr);
  align-items: center;
  gap: clamp(40px, 6vw, 96px);
}
.architecture-copy { align-self: center; }
.architecture-note {
  max-width: 38ch;
  margin-top: 26px;
  color: var(--text-dim);
  line-height: 1.8;
}
.architecture .stack-wrap { max-height: min(76vh, 760px); }

/* ---------- 语言切换 ---------- */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color 0.25s;
}
.lang-toggle:hover { border-color: rgba(200, 220, 255, 0.4); }
.lt-opt { transition: color 0.25s; }
.lt-opt.is-active { color: var(--text); }
.lt-sep { opacity: 0.4; }

/* ---------- 英文排版微调 ---------- */
[lang="en"] .hero-copy { width: min(74vw, 1080px); }
/* 拉丁排版惯例:大标题紧排负字距、行高压到 1 以下;中文基线不适用,故只在英文态生效。 */
[lang="en"] .hero-title { font-size: clamp(60px, 5.6vw, 92px); line-height: 1; font-weight: 560; letter-spacing: -0.032em; }
[lang="en"] .display { line-height: 1.12; font-weight: 600; letter-spacing: -0.018em; }
[lang="en"] .display-lg { font-size: clamp(34px, 5vw, 66px); }
[lang="en"] .cap-title, [lang="en"] .partner-row h3 { font-weight: 600; line-height: 1.3; letter-spacing: -0.008em; }
[lang="en"] .proof-name { font-weight: 600; line-height: 1.35; letter-spacing: 0; }
[lang="en"] .cap-title-en { display: none; }
[lang="en"] body { letter-spacing: 0; }
[lang="en"] body, [lang="en"] .hero-sub,
[lang="en"] .cap-desc, [lang="en"] .proof-desc,
[lang="en"] .partner-row p { line-height: 1.65; }
[lang="en"] .sp-item { font-size: 10px; padding: 6px 6px; letter-spacing: 0.03em; }
[lang="en"] .sp-item::after { margin-left: 5px; }
[lang="en"] .architecture-route { font-size: 10px; letter-spacing: 0.04em; gap: 7px 8px; }
[lang="en"] .architecture-route span { padding: 6px 8px; }
[lang="en"] .architecture-legend { font-size: 10px; letter-spacing: 0.03em; }

.architecture-route {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin-top: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(179, 214, 247, 0.68);
}
.architecture-route span {
  padding: 7px 9px;
  border: 1px solid rgba(111, 212, 255, 0.16);
  background: rgba(15, 52, 94, 0.16);
}
.architecture-route i {
  color: rgba(111, 212, 255, 0.54);
  font-style: normal;
}
/* 链路中属于维特尔的环节:左侧实心标记 */
.architecture-route span.route-ours {
  color: var(--text);
  border-color: rgba(111, 212, 255, 0.42);
  background: rgba(20, 76, 136, 0.34);
  box-shadow: inset 2px 0 0 var(--cold-glow);
}
.architecture-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-top: 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}
.architecture-legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.architecture-legend span::before {
  content: "";
  width: 9px;
  height: 9px;
  flex: none;
  border: 1px solid rgba(111, 212, 255, 0.16);
  background: rgba(15, 52, 94, 0.16);
}
.architecture-legend .lg-ours::before {
  border-color: rgba(111, 212, 255, 0.42);
  background: rgba(20, 76, 136, 0.34);
  box-shadow: inset 2px 0 0 var(--cold-glow);
}

/* ---------- 战略叙事 ---------- */

.value-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(280px, 0.88fr) minmax(0, 1.62fr);
  margin-top: clamp(56px, 7vw, 96px);
  overflow: hidden;
  border: 1px solid rgba(123, 194, 255, 0.19);
  background:
    radial-gradient(circle at 8% 10%, rgba(43, 128, 213, 0.18), transparent 34%),
    linear-gradient(145deg, rgba(10, 27, 48, 0.94), rgba(5, 12, 23, 0.96));
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.24);
}
.value-panel::before {
  content: "V";
  position: absolute;
  left: -0.08em;
  bottom: -0.25em;
  font-family: var(--font-mono);
  font-size: clamp(180px, 25vw, 360px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(121, 202, 255, 0.07);
  pointer-events: none;
}
.value-lead {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 540px;
  padding: clamp(36px, 5vw, 68px);
  border-right: 1px solid rgba(123, 194, 255, 0.16);
}
.value-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(111, 212, 255, 0.72);
}
.value-lead h3 {
  margin: auto 0 30px;
  font-size: clamp(30px, 3.2vw, 46px);
  line-height: 1.2;
  font-weight: 580;
  letter-spacing: -0.015em;
}
.value-lead > p:last-child {
  max-width: 38ch;
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.85;
  color: var(--text-dim);
}

.tstat-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}
.tstat-val {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0;
}
.tstat-bar {
  height: 2px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.tstat-bar i {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--cold), var(--hot));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.4s var(--ease-out) 0.3s;
}
.is-visible .tstat-bar i, .tstat.is-visible .tstat-bar i { transform: scaleX(1); }

/* ---------- 能力分层 ---------- */
.cap-list { border-top: 1px solid var(--line); position: relative; }
.flow-legend {
  position: absolute;
  right: 2px;
  bottom: 12px;
  display: grid;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}
.flow-legend span::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  margin-right: 7px;
  vertical-align: middle;
}
.flow-cold::before { background: #4da3ff; box-shadow: 0 0 8px rgba(77, 163, 255, 0.7); }
.flow-hot::before { background: #ff4d4a; box-shadow: 0 0 8px rgba(255, 77, 74, 0.55); }
.cap-list.is-traced::before { transform: scaleY(1); }
.cap-row {
  display: grid;
  grid-template-columns: 80px minmax(0, 1.6fr) 46px minmax(0, 1fr) 40px;
  gap: clamp(16px, 3vw, 48px);
  align-items: center;
  padding: clamp(28px, 3.4vw, 44px) clamp(4px, 1vw, 16px);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background 0.5s var(--ease-out);
  cursor: default;
}
.cap-row:hover { background: rgba(148, 178, 224, 0.035); }
.cap-row.is-current { background: linear-gradient(90deg, rgba(77, 163, 255, 0.07), transparent 70%); }
.cap-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2vw, 26px);
  color: var(--text-mute);
  letter-spacing: 0.05em;
  transition: color 0.3s;
}
.cap-row:hover .cap-num { color: var(--cold); }
.cap-row.is-current .cap-num { color: var(--cold-glow); text-shadow: 0 0 14px rgba(77, 163, 255, 0.35); }
.cap-title {
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 550;
  line-height: 1.45;
  letter-spacing: 0.025em;
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}
.cap-title-en {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--text-mute);
}
.cap-desc { margin-top: 10px; font-size: 16px; line-height: 1.9; color: var(--text-dim); max-width: 50ch; }
.cap-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}
.cap-meta span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 6px 12px;
  white-space: nowrap;
  transition: border-color 0.3s, color 0.3s;
}
.cap-row:hover .cap-meta span { border-color: var(--line-strong); color: var(--text-dim); }
.cap-arrow {
  font-size: 20px;
  color: var(--text-mute);
  transition: transform 0.35s var(--ease-out), color 0.3s;
}
.cap-row:hover .cap-arrow { transform: translateX(6px); color: var(--text); }

/* ---------- 工程验证 ---------- */
.proof .section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  column-gap: clamp(48px, 7vw, 110px);
  row-gap: 16px;
  align-items: end;
  max-width: none;
  margin-bottom: clamp(52px, 6vw, 78px);
}
.proof .section-head .eyebrow { grid-column: 1 / -1; }
.proof .section-head .display { grid-column: 1; }
.proof .section-head .display[data-reveal] { opacity: 1; transform: none; clip-path: none; }
.proof-intro {
  grid-column: 2;
  padding: 4px 0 2px;
}
.proof-intro[data-reveal] { opacity: 1; transform: none; }
.proof-intro > p {
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.8;
  color: var(--text-dim);
}
.proof-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: rgba(148, 178, 224, 0.14);
  border: 1px solid rgba(148, 178, 224, 0.14);
}
.proof-principles span {
  display: grid;
  gap: 7px;
  min-height: 78px;
  padding: 14px;
  background: rgba(8, 18, 33, 0.9);
}
.proof-principles b {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--cold-glow);
}
.proof-principles em {
  font-size: 14px;
  line-height: 1.45;
  color: rgba(226, 239, 252, 0.86);
  font-style: normal;
}
.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(148, 178, 224, 0.15);
  border: 1px solid rgba(148, 178, 224, 0.17);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.proof-card {
  display: flex;
  flex-direction: column;
  min-height: 380px;
  background: linear-gradient(160deg, rgba(8, 17, 31, 0.98), rgba(4, 8, 15, 0.98));
  padding: clamp(28px, 3.2vw, 48px);
  transition: background 0.35s;
}
.proof-card:hover { background: linear-gradient(160deg, rgba(15, 34, 58, 0.98), rgba(7, 17, 31, 0.98)); }
.proof-val {
  font-family: var(--font-mono);
  font-size: clamp(26px, 2.6vw, 38px);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}
.proof-val span { font-size: 0.5em; color: var(--text-mute); letter-spacing: 0.04em; }
.proof-name {
  margin-top: 14px;
  font-size: 18px;
  font-weight: 550;
  line-height: 1.5;
  letter-spacing: 0.03em;
}
.proof-desc { margin-top: 12px; font-size: clamp(15px, 1.05vw, 16px); line-height: 1.9; color: var(--text-dim); }
.proof-meta {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: rgba(132, 207, 249, 0.7);
}

/* ---------- 生态合作 ---------- */
.partner-list { border-top: 1px solid var(--line); }
.partner-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: clamp(16px, 4vw, 64px);
  padding: clamp(24px, 3vw, 40px) clamp(4px, 1vw, 16px);
  border-bottom: 1px solid var(--line);
  transition: background 0.35s;
}
.partner-row:hover { background: rgba(148, 178, 224, 0.035); }
.partner-row h3 { font-size: clamp(18px, 1.8vw, 24px); font-weight: 550; line-height: 1.45; letter-spacing: 0.025em; }
.partner-row p { font-size: 16px; line-height: 1.9; color: var(--text-dim); align-self: center; }

/* ---------- 联系 CTA ---------- */
.contact-band {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(48px, 7vw, 110px) clamp(28px, 6vw, 100px);
  background:
    radial-gradient(90% 130% at 85% 110%, rgba(255, 77, 74, 0.07), transparent 55%),
    radial-gradient(90% 130% at 10% -20%, rgba(77, 163, 255, 0.1), transparent 55%),
    var(--panel);
  position: relative;
  overflow: hidden;
}
.contact-actions {
  margin-top: clamp(32px, 4vw, 56px);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 28px;
}
.contact-mail {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  transition: color 0.3s, border-color 0.3s;
}
.contact-mail:hover { color: var(--text); border-color: var(--text); }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: clamp(56px, 7vw, 96px) 0 40px;
  background: var(--bg-alt);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(32px, 5vw, 64px);
  margin-bottom: clamp(48px, 6vw, 80px);
}
.footer-tag { margin-top: 20px; color: var(--text-mute); font-size: 15px; line-height: 1.8; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--text-mute);
  font-weight: 500;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.footer-col a { font-size: 15px; color: var(--text-dim); transition: color 0.25s; width: fit-content; }
.footer-col a:hover { color: var(--text); }
.footer-muted { font-size: 14px; color: var(--text-mute); }
.footer-legal {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 14px;
  color: var(--text-mute);
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
[data-reveal].is-visible { opacity: 1; transform: none; }
.section-head .display[data-reveal] {
  clip-path: inset(0 0 100% 0);
  transform: translateY(34px);
  transition: opacity 0.9s var(--ease-out), transform 1s var(--ease-out), clip-path 1s var(--ease-out);
}
.section-head .display[data-reveal].is-visible { clip-path: inset(0); transform: none; }
[data-reveal][data-reveal-delay="1"] { transition-delay: 0.1s; }
[data-reveal][data-reveal-delay="2"] { transition-delay: 0.2s; }
[data-reveal][data-reveal-delay="3"] { transition-delay: 0.3s; }
[data-reveal][data-reveal-delay="4"] { transition-delay: 0.4s; }
[data-reveal][data-reveal-delay="5"] { transition-delay: 0.5s; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .brand-en { display: none; }
  .hero-copy { width: min(74vw, 720px); }
  .hero-title { font-size: clamp(58px, 7.5vw, 76px); }
  .hero-cad-image { right: -6vw; width: min(62vw, 680px); }
  [lang="en"] .hero-copy { width: min(78vw, 780px); }
  [lang="en"] .hero-title { font-size: clamp(52px, 6.7vw, 70px); }
  .architecture-grid { grid-template-columns: minmax(240px, 0.75fr) minmax(380px, 1.25fr); gap: 30px; }
  .cap-row { grid-template-columns: 56px minmax(0, 1fr) 32px; }
  .cap-meta { display: none; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .proof .section-head { grid-template-columns: 1fr; }
  .proof-intro { grid-column: 1; max-width: 720px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; }
  .lang-toggle { padding: 7px 10px; }
  .hero {
    min-height: 92svh;
    padding-top: 110px;
    padding-bottom: 56px;
  }
  .hero::before { background: linear-gradient(180deg, rgba(5, 10, 20, 0.15) 0%, rgba(5, 10, 20, 0.42) 42%, rgba(5, 10, 20, 0.94) 72%, rgba(5, 10, 20, 0.98) 100%); }
  .hero-cad-stage { inset: -6px; transform: none; }
  .hero-cad-image {
    top: 0;
    right: auto;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 68% center;
    mix-blend-mode: normal;
    opacity: 1;
    -webkit-mask-image: none;
    mask-image: none;
    transform: none;
    animation: none;
  }
  .hero-cad-reveal { height: 58%; }
  .hero-cad-node, .hero-cad-status, .hero-cad-focus { display: none; }
  .hero-cad-scan { bottom: 43%; }
  .hero-aperture-type {
    top: 30%;
    right: -26%;
    font-size: 27vw;
    opacity: 0.58;
  }
  .hero-aperture {
    top: 7vh;
    right: -6vw;
    width: 42vw;
    height: 45vh;
    min-height: 330px;
    opacity: 0.72;
  }
  .hero-aperture-beam { right: -18%; bottom: 32vh; width: 76vw; height: 24vh; opacity: 0.48; }
  .hero-aperture-axis { display: none; }
  .hero-poster-word { right: -22%; bottom: 39vh; font-size: 40vw; opacity: 0.48; }
  .hero-thermal-plane {
    top: 9vh;
    right: -23vw;
    width: 70vw;
    height: 48vh;
    min-height: 340px;
    opacity: 0.68;
  }
  .hero-depth-slab {
    top: 11vh;
    right: -26vw;
    width: 70vw;
    height: 48vh;
    min-height: 340px;
    opacity: 0.55;
  }
  .hero-thermal-plane strong { font-size: clamp(46px, 12vw, 72px); }
  .hero-plane-spectrum { top: 22%; right: 10%; width: 44%; height: 28%; }
  .hero-plane-route { display: none; }
  .hero-poster-index { display: none; }
  .hero-capability-rail { display: none; }
  .hero-ai-disclosure { display: none; }
  .hero-fluid-motion { right: -22%; width: 92%; bottom: 1%; }
  .hero-grid { display: block; }
  .hero-title { max-width: none; font-size: clamp(34px, 9.6vw, 48px); }
  .hero-copy { width: 100%; padding-top: 18vh; }
  [lang="en"] .hero-copy { width: 100%; }
  [lang="en"] .hero-title { font-size: clamp(32px, 8.9vw, 46px); line-height: 1.04; }
  .architecture-grid { grid-template-columns: 1fr; gap: 44px; }
  .architecture .hero-stack { padding: 0; }
  .stack-wrap { aspect-ratio: 10 / 10.5; max-height: 60vh; }
  .sp-item { font-size: 10px; padding: 6px 7px; }
  .sp-item::after { margin-left: 6px; }






  .value-panel { grid-template-columns: 1fr; }
  .value-lead { min-height: 420px; border-right: none; border-bottom: 1px solid rgba(123, 194, 255, 0.16); }
  .partner-row { grid-template-columns: 1fr; gap: 8px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-media-video { display: none; }






  .value-lead { min-height: 0; }
  .value-lead h3 { margin-top: 64px; }
  .proof-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-media-video { display: none; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .tstat-bar i { transform: scaleX(1); transition: none; }
  .hud-dot { animation: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .hero-stack { transform: none; }
  .hero-cad-stage { transform: none; transition: none; }
  .hero-cad-reveal { opacity: 1; animation: none; }
  .hero-cad-image { animation: none; transform: none; }
  .hero-cad-scan, .hero-cad-node, .hero-cad-focus { display: none; }
  .hero-cad-status { opacity: 1; animation: none; }
  .section-head .display[data-reveal] { clip-path: none; transform: none; }
}

@media (hover: none), (pointer: coarse) {
  .hero-stack { transform: none; }
}

/* ============================================================
   动效系统(fx):热路径 / 仪表台 / 上电 / 工况面板
   ============================================================ */

/* ---------- 分层工程标签(点击图例显示) ---------- */
.stack-tags {
  position: relative;
  height: 18px;
  margin-top: 10px;
  text-align: center;
}
@media (max-width: 560px) {
  .stack-tags span { font-size: 11px; letter-spacing: 0.03em; }
}
.stack-tags span {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.4s;
}
.stack-tags[data-show="0"] span[data-tag="0"],
.stack-tags[data-show="1"] span[data-tag="1"],
.stack-tags[data-show="2"] span[data-tag="2"],
.stack-tags[data-show="3"] span[data-tag="3"] { opacity: 1; }

/* 图下唯一一句文案:产品归属;不写"图中/四层"式导览(用户两次否决) */
.stack-scope {
  max-width: 56ch;
  margin: 14px auto 0;
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  text-align: center;
  color: var(--text-mute);
}
[lang="en"] .stack-scope { font-family: var(--font-mono); letter-spacing: 0.02em; }

/* ---------- 工程验证:仪表画布 ---------- */
.proof-viz {
  width: 100%;
  height: 54px;
  display: block;
  margin-top: 14px;
}
.proof-val.locking { animation: val-lock 0.5s steps(2) 2; }
@keyframes val-lock {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ---------- 能力行:线稿剖面 + 路径扫过 ---------- */
.cap-glyph {
  width: 46px;
  height: 32px;
  flex: none;
  align-self: center;
  fill: none;
  stroke: currentColor;
  stroke-width: 1;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: var(--text-dim);
  opacity: 0;
  transition: opacity 0.4s;
}
.cap-glyph path, .cap-glyph circle {
  stroke-dasharray: 140;
  stroke-dashoffset: 140;
  transition: stroke-dashoffset 0.2s;
}
.cap-row:hover .cap-glyph { opacity: 0.8; }
.cap-row:hover .cap-glyph path, .cap-row:hover .cap-glyph circle {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.9s var(--ease-out);
}
.cap-row::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg,
    rgba(77, 163, 255, 0) 0%, rgba(77, 163, 255, 0.55) 30%,
    rgba(255, 77, 74, 0.55) 70%, rgba(255, 77, 74, 0) 100%);
  transform: scaleX(0);
  transform-origin: left;
}
.cap-row:hover::after {
  transform: scaleX(1);
  transition: transform 0.9s var(--ease-out);
}
@media (max-width: 1024px) { .cap-glyph { display: none; } }

/* ---------- KPI:仪表上电 ---------- */

/* ---------- 联系区:工况参数面板 ---------- */
.contact-band {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: end;
}
.cond-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(4, 7, 13, 0.45);
  padding: 24px 26px 20px;
  font-family: var(--font-mono);
}
.cond-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--text);
}
.cond-en { font-size: 11px; letter-spacing: 0.2em; color: var(--text-mute); }
[lang="en"] .cond-en { display: none; }
.cond-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  letter-spacing: 0.05em;
  color: var(--text-mute);
}
.cond-val { color: var(--text-dim); font-variant-numeric: tabular-nums; }
.cond-chips { display: flex; gap: 6px; }
.cond-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-mute);
  background: none;
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 4px 11px;
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s;
}
.cond-chip:hover { color: var(--text-dim); border-color: var(--line-strong); }
.cond-chip.on { color: var(--text); border-color: rgba(111, 212, 255, 0.5); }
.cond-note {
  margin-top: 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-mute);
}
.contact-band .display-lg { font-size: clamp(30px, 3.5vw, 50px); }
[lang="en"] .contact-band .display-lg { font-size: clamp(28px, 3.2vw, 46px); }
@media (max-width: 900px) {
  /* 1fr 的最小尺寸是 min-content,窄屏下会被 .cond-row 的最小内容撑破容器,
     导致联系区在 ≤430px(英文尤其明显)横向溢出;改用 minmax(0,1fr) 允许收缩。 */
  .contact-band { grid-template-columns: minmax(0, 1fr); align-items: start; }
}
@media (max-width: 430px) {
  .cond-row { flex-wrap: wrap; gap: 2px 12px; }
  .cond-row .cond-val, .cond-row .cond-chips { margin-left: auto; }
  /* 英文态三个阶段按钮(New build/Retrofit/Validation)不换行会撑破视口 */
  .cond-chips { flex-wrap: wrap; justify-content: flex-end; row-gap: 6px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {

  .cap-glyph { opacity: 0.5; }
  .cap-glyph path, .cap-glyph circle { stroke-dashoffset: 0; }
}

/* 截图辅助(?shot=1) */
.shot .hero { min-height: 0; padding-top: 140px; }

/* ============================================================
   中文标签排版(2026-08)
   全站小标签原本统一走等宽 + 0.13–0.22em 宽字距——那是拉丁标签的
   正确做法,但中文是全宽方块字,再拉开字距就会"散架",这是中文态显得
   别扭的第二个来源(首个是标题的负字距,已在 .display/.hero-title 修正)。
   中文态改用无衬线 + 克制字距;英文态在 [lang="en"] 回到等宽宽字距。
   纯编号/数值子元素始终保留等宽,维持工程感。
   ============================================================ */
.hero-signature,
.sp-item,
.stack-tags span,
.architecture-route span,
.architecture-legend,
.cond-head,
.cond-row {
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}
.hero-signature { letter-spacing: 0.12em; }
.eyebrow { letter-spacing: 0.15em; }
/* 编号与数值保留等宽 */
.sp-item i,
.cond-val,
.architecture-legend .lg-num { font-family: var(--font-mono); letter-spacing: 0.06em; }

[lang="en"] .hero-signature,
[lang="en"] .sp-item,
[lang="en"] .stack-tags span,
[lang="en"] .architecture-route span,
[lang="en"] .architecture-legend,
[lang="en"] .cond-head,
[lang="en"] .cond-row { font-family: var(--font-mono); }
[lang="en"] .eyebrow { letter-spacing: 0.22em; }
[lang="en"] .hero-signature { letter-spacing: 0.15em; }

/* ============================================================
   首屏视频 Hero（2026-08-18）
   全屏实拍背景 + Submer 式短标题与底部说明。文字、导航保持真实 HTML。
   ============================================================ */
.nav {
  position: absolute;
  top: clamp(12px, 1.6vw, 24px);
  left: clamp(12px, 3.2vw, 56px);
  right: clamp(12px, 3.2vw, 56px);
  border: 0;
  background: transparent;
}
.nav.scrolled,
.nav.open {
  border: 0;
  background: transparent;
}
.nav-inner {
  max-width: none;
  height: 76px;
  padding: 0 clamp(18px, 2vw, 30px);
  border: 1px solid var(--hero-glass-line);
  border-radius: 18px;
  background: var(--hero-glass);
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.16);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  backdrop-filter: blur(18px) saturate(1.15);
  transition: background 0.35s, border-color 0.35s, box-shadow 0.35s;
}
.nav.scrolled .nav-inner {
  background: var(--hero-glass-scrolled);
  border-color: rgba(226, 239, 255, 0.15);
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.28);
}
.nav.open .nav-inner {
  border-radius: 18px 18px 0 0;
  background: rgba(4, 8, 14, 0.94);
}
.nav-mobile {
  border: 1px solid var(--hero-glass-line);
  border-top: 0;
  border-radius: 0 0 18px 18px;
  background: rgba(4, 8, 14, 0.96);
}

.hero {
  min-height: var(--hero-height);
  padding: 0;
  align-items: stretch;
  background: #02060c;
}
.hero::before {
  z-index: -1;
  background: linear-gradient(
    90deg,
    var(--hero-shade-left) 0%,
    rgba(2, 6, 12, 0.80) 28%,
    var(--hero-shade-middle) 50%,
    var(--hero-shade-right) 76%,
    rgba(2, 6, 12, 0.10) 100%
  );
}
.hero::after {
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(2, 6, 12, 0.44) 0%, transparent 30%),
    linear-gradient(0deg, rgba(2, 6, 12, 0.78) 0%, transparent 34%);
}
.hero-media {
  background: #02060c;
}
.hero-media::before {
  display: none;
}
.hero-media-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  filter: saturate(0.92) contrast(1.04);
}
.hero-grid {
  min-height: var(--hero-height);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-top: clamp(170px, 22vh, 250px);
  padding-bottom: clamp(48px, 7vh, 88px);
}
.hero-copy {
  width: var(--hero-copy-width);
  padding: 0;
  text-shadow: 0 3px 30px rgba(0, 0, 0, 0.68);
}
.hero .eyebrow {
  margin-bottom: clamp(24px, 3vh, 38px);
  color: rgba(226, 239, 255, 0.74);
}
.hero-title {
  max-width: 1120px;
  font-size: var(--hero-title-size);
  line-height: 1.06;
  font-weight: 520;
  letter-spacing: 0.008em;
  text-wrap: balance;
}
.hero-title-line + .hero-title-line {
  margin-top: 0.08em;
}
.hero-title em {
  color: var(--cold-glow);
  text-shadow: 0 0 34px rgba(58, 168, 255, 0.32);
}
.hero-slogan {
  margin: clamp(20px, 2.5vh, 30px) 0 0;
  color: rgba(239, 248, 255, 0.96);
  font-size: clamp(18px, 1.65vw, 26px);
  line-height: 1.35;
  font-weight: 620;
  letter-spacing: 0.16em;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.78);
}
[lang="en"] .hero-slogan {
  font-size: clamp(15px, 1.2vw, 19px);
  letter-spacing: 0.11em;
}
.hero-sub {
  max-width: 45ch;
  margin: 0;
  color: rgba(239, 246, 255, 0.88);
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.7;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.78);
}
[lang="en"] .hero-copy {
  width: min(78vw, 1180px);
}
[lang="en"] .hero-title {
  max-width: 1180px;
  font-size: clamp(54px, 5.65vw, 98px);
  line-height: 0.98;
  font-weight: 560;
  letter-spacing: -0.038em;
}

@media (max-width: 1024px) {
  .hero-copy { width: min(84vw, 820px); }
  .hero-title { font-size: clamp(48px, 7vw, 72px); }
  [lang="en"] .hero-copy { width: min(88vw, 860px); }
  [lang="en"] .hero-title { font-size: clamp(44px, 6.4vw, 66px); }
}

@media (max-width: 768px) {
  .nav {
    top: 12px;
    left: 12px;
    right: 12px;
  }
  .nav-inner {
    height: 64px;
    padding: 0 14px;
    border-radius: 14px;
  }
  .nav.open .nav-inner { border-radius: 14px 14px 0 0; }
  .nav-mobile { border-radius: 0 0 14px 14px; }
  .brand-mark { width: 38px; height: 38px; border-radius: 10px; }
  .hero {
    min-height: 100svh;
    padding: 0;
  }
  .hero::before {
    background:
      linear-gradient(180deg, rgba(2, 6, 12, 0.28) 0%, rgba(2, 6, 12, 0.06) 36%, rgba(2, 6, 12, 0.22) 78%, rgba(2, 6, 12, 0.34) 100%),
      linear-gradient(90deg, rgba(2, 6, 12, 0.24), rgba(2, 6, 12, 0.06));
  }
  .hero::after { background: linear-gradient(180deg, rgba(2, 6, 12, 0.28), transparent 28%); }
  .hero-media {
    background-image: url("../images/mobile-hero-tech-coil-v1.jpg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    filter: brightness(1.22) saturate(1.05);
  }
  .hero-media-video {
    display: none;
    object-position: 56% center;
  }
  .hero-grid {
    min-height: 100svh;
    padding-top: clamp(142px, 21vh, 190px);
    padding-bottom: 38px;
  }
  .hero-copy,
  [lang="en"] .hero-copy { width: 100%; padding: 0; }
  .hero-title { font-size: clamp(36px, 9vw, 52px); }
  [lang="en"] .hero-title {
    font-size: clamp(34px, 8.2vw, 48px);
    line-height: 1.02;
  }
  .hero-sub {
    max-width: 36ch;
    font-size: 16px;
    line-height: 1.68;
  }
  .hero-slogan {
    margin-top: 18px;
    font-size: clamp(16px, 4.5vw, 20px);
    letter-spacing: 0.12em;
  }
}

@media (max-width: 480px) {
  .hero-media-video { display: none; }
  .hero-grid {
    padding-top: 132px;
    padding-bottom: 30px;
  }
  .hero .eyebrow {
    max-width: 27ch;
    margin-bottom: 20px;
    font-size: 10px;
    line-height: 1.55;
  }
  .hero-title {
    font-size: clamp(30px, 8.6vw, 38px);
    line-height: 1.12;
  }
  [lang="en"] .hero-title {
    font-size: clamp(29px, 8vw, 36px);
    line-height: 1.04;
  }
  [lang="en"] .hero-title-line { white-space: normal; }
  .hero-sub { max-width: 31ch; font-size: 15px; line-height: 1.65; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-media {
    background-image: url("../video/vitern-liquid-cooling-hero-poster-v6.jpg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
  }
  .hero-media-video { display: none; }
}

@media (max-width: 768px) {
  .hero-media {
    background-image: url("../images/mobile-hero-tech-coil-v1.jpg");
    background-position: center center;
  }
}

.shot .hero,
.shot .hero-grid { min-height: 720px; }