/* ==========================================================================
   钢甲云梯 SAL-03 · 设计系统与页面样式
   深色电影工业风 / 精细网格 / 玻璃与金属 / 克制强调色
   ========================================================================== */

:root {
  /* 色彩 */
  --bg-0: #05070a;
  --bg-1: #080b0f;
  --bg-2: #0b0f14;
  --bg-3: #0e1319;
  --surface: rgba(148, 184, 196, 0.045);
  --surface-2: rgba(148, 184, 196, 0.08);
  --line: rgba(148, 184, 196, 0.12);
  --line-strong: rgba(148, 184, 196, 0.24);
  --text: #e9f2f4;
  --text-2: #93a7b0;
  --text-3: #5b6b73;
  --cyan: #26f0ff;
  --cyan-dim: #18bcd0;
  --cyan-soft: rgba(38, 240, 255, 0.12);
  --orange: #ff6b1a;
  --orange-soft: rgba(255, 107, 26, 0.13);
  --purple: #8b5cff;
  --purple-soft: rgba(139, 92, 255, 0.13);

  /* 字体 */
  --font-display: "Bahnschrift", "DIN Alternate", "Segoe UI", "Source Han Sans CN", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans CN", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "Cascadia Code", "JetBrains Mono", ui-monospace, Consolas, "Courier New", monospace;

  /* 尺度 */
  --maxw: 1320px;
  --pad-x: clamp(20px, 4.5vw, 64px);
  --sec-y: clamp(96px, 11vw, 156px);
  --radius: 14px;
  --radius-s: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 76px;
}

/* ---------------- 基础 ---------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

main { overflow: clip; }

::selection { background: rgba(38, 240, 255, 0.24); color: #fff; }

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

button {
  font-family: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: #1e2a31; border-radius: 6px; border: 2px solid var(--bg-0); }
::-webkit-scrollbar-thumb:hover { background: #2a3a44; }

/* ---------------- 通用排版组件 ---------------- */
.section-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--text-3);
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-index::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--orange);
}
.section-index.light { color: var(--text-2); }

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
  margin: 0 0 14px;
  text-transform: uppercase;
}

.section-head { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x); }
.section-head h2 {
  font-size: clamp(34px, 4.4vw, 60px);
  line-height: 1.14;
}
.section-lead {
  color: var(--text-2);
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.9;
  max-width: 620px;
  margin-top: 26px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
}
.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: blink 2.6s infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ---------------- 按钮 ---------------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  height: 54px;
  padding: 0 26px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-s);
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease), background 0.3s, border-color 0.3s, color 0.3s;
  overflow: hidden;
  white-space: nowrap;
}
.btn-primary {
  background: var(--orange);
  color: #14090a;
  box-shadow: 0 0 0 rgba(255, 107, 26, 0);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(255, 107, 26, 0.28);
  background: #ff7c33;
}
.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--text);
  background: rgba(148, 184, 196, 0.03);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  border-color: rgba(38, 240, 255, 0.5);
  color: var(--cyan);
  transform: translateY(-2px);
}
.btn-arrow { font-family: var(--font-mono); transition: transform 0.4s var(--ease); }
.btn:hover .btn-arrow { transform: translate(3px, 0); }
.btn-primary:hover .btn-arrow { transform: translate(0, 3px); }
.btn-large { height: 60px; padding: 0 34px; font-size: 15px; }

/* ---------------- 揭示动效 ---------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}
.hero-title .line { display: block; overflow: hidden; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.hero-title .line-inner {
  display: inline-block;
  transform: translateY(112%);
  opacity: 0;
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.hero-title .line.is-revealed .line-inner { transform: translateY(0); opacity: 1; }

/* ==========================================================================
   导航
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 var(--pad-x);
  transition: background 0.4s, border-color 0.4s, backdrop-filter 0.4s;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(5, 7, 10, 0.72);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
  border-bottom-color: var(--line);
}

.logo { display: flex; align-items: center; gap: 13px; flex: none; }
.logo img { width: 36px; height: auto; filter: drop-shadow(0 0 10px rgba(38, 240, 255, 0.3)); }
.logo-copy { display: flex; flex-direction: column; line-height: 1.15; }
.logo-copy strong {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.12em;
}
.logo-copy small {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.2em;
  color: var(--text-3);
  margin-top: 3px;
}

#site-nav { display: flex; gap: clamp(20px, 3vw, 44px); }
#site-nav a {
  position: relative;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  padding: 6px 2px;
  transition: color 0.3s;
}
#site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1.5px;
  background: var(--cyan);
  transition: right 0.35s var(--ease);
}
#site-nav a:hover, #site-nav a.is-active { color: var(--text); }
#site-nav a:hover::after, #site-nav a.is-active::after { right: 0; }

.header-right { display: flex; align-items: center; gap: 22px; flex: none; }
.sys-status {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 8px;
}
.sys-status i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #37e07b;
  box-shadow: 0 0 8px #37e07b;
  animation: blink 2.2s infinite;
}
.header-cta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 10px 16px;
  transition: border-color 0.3s, color 0.3s, background 0.3s;
}
.header-cta span { color: var(--orange); margin-left: 6px; }
.header-cta:hover { border-color: var(--orange); background: var(--orange-soft); }

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  position: relative;
}
.menu-toggle span {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 1.6px;
  background: var(--text);
  transition: transform 0.35s var(--ease), top 0.35s var(--ease);
}
.menu-toggle span:first-child { top: 16px; }
.menu-toggle span:last-child { top: 24px; }
.menu-toggle.is-open span:first-child { top: 20px; transform: rotate(45deg); }
.menu-toggle.is-open span:last-child { top: 20px; transform: rotate(-45deg); }

/* ==========================================================================
   首屏
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding: calc(var(--header-h) + clamp(28px, 5vh, 64px)) var(--pad-x) 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-0);
  overflow: clip;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 184, 196, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 184, 196, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(120% 90% at 70% 40%, #000 30%, transparent 75%);
  transform: translate(calc(var(--px, 0) * -14px), calc(var(--py, 0) * -10px));
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  transition: transform 0.6s var(--ease);
}
.hero-glow-a {
  width: 46vw; height: 46vw;
  right: -12vw; top: -10vw;
  background: radial-gradient(circle, rgba(38, 240, 255, 0.12), transparent 65%);
  transform: translate(calc(var(--px, 0) * 30px), calc(var(--py, 0) * 22px));
}
.hero-glow-b {
  width: 34vw; height: 34vw;
  left: -10vw; bottom: -14vw;
  background: radial-gradient(circle, rgba(255, 107, 26, 0.1), transparent 65%);
  transform: translate(calc(var(--px, 0) * -26px), calc(var(--py, 0) * -18px));
}

.hero-inner {
  position: relative;
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 5.2fr) minmax(0, 6.8fr);
  gap: clamp(24px, 3.5vw, 56px);
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  align-items: center;
}

.hero-copy { padding-bottom: clamp(40px, 6vh, 80px); }

.hero-title {
  font-size: clamp(46px, 5.6vw, 88px);
  line-height: 1.06;
  letter-spacing: -0.045em;
  margin: 26px 0 28px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--orange) 10%, #ffb37c 55%, var(--orange) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  color: var(--text-2);
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.95;
  max-width: 540px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }

.hero-meta {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 30px);
  margin-top: clamp(36px, 6vh, 64px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--text-3);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}
.hero-meta b {
  font-family: var(--font-display);
  color: var(--text);
  font-size: 19px;
  margin-right: 8px;
}
.hero-meta i { width: 1px; height: 22px; background: var(--line-strong); }

/* ---- 3D 查看器框架 ---- */
.hero-viewer { position: relative; }
.viewer-frame {
  position: relative;
  aspect-ratio: 1 / 1.04;
  max-height: min(76vh, 780px);
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 70% at 50% 30%, rgba(38, 240, 255, 0.05), transparent 70%),
    linear-gradient(180deg, rgba(14, 19, 25, 0.6), rgba(5, 7, 10, 0.2));
  overflow: hidden;
}
.viewer-frame::before, .viewer-frame::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1.5px solid rgba(38, 240, 255, 0.55);
  z-index: 5;
  pointer-events: none;
}
.viewer-frame::before { top: 10px; left: 10px; border-right: 0; border-bottom: 0; }
.viewer-frame::after { bottom: 10px; right: 10px; border-left: 0; border-top: 0; }

#hero-3d {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: pan-y;
}
#hero-3d.is-dragging { cursor: grabbing; }

.viewer-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 8%;
  background: radial-gradient(80% 80% at 50% 40%, #0d1218, #05070a);
}
.viewer-fallback img {
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  filter: saturate(0.92) brightness(0.94);
}
html.webgl-ready .viewer-fallback { display: none; }
html:not(.webgl-ready) #hero-3d, html.webgl-failed #hero-3d { display: none; }

.viewer-hud { position: absolute; inset: 0; pointer-events: none; z-index: 4; }
.viewer-topline {
  position: absolute;
  top: 16px;
  left: 44px;
  right: 44px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  color: var(--text-3);
}
.viewer-topline i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  animation: blink 2.4s infinite;
}
.viewer-topline span { margin-left: auto; color: rgba(38, 240, 255, 0.6); }

.viewer-callout {
  position: absolute;
  padding: 8px 12px;
  background: rgba(8, 11, 15, 0.72);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 6px;
  backdrop-filter: blur(10px);
  font-family: var(--font-mono);
  opacity: 0;
  transition: opacity 1s var(--ease) 0.8s;
}
html.webgl-ready .viewer-callout { opacity: 1; }
.viewer-callout b { display: block; font-size: 9.5px; letter-spacing: 0.16em; color: var(--cyan); }
.viewer-callout span { font-size: 11px; color: var(--text-2); font-family: var(--font-body); }
.callout-a { left: 5%; bottom: 24%; }
.callout-b { right: 4%; top: 18%; border-left-color: var(--purple); }
.callout-b b { color: var(--purple); }
.callout-c { right: 14%; bottom: 34%; border-left-color: var(--orange); }
.callout-c b { color: var(--orange); }

.viewer-modes {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  padding: 4px;
  background: rgba(8, 11, 15, 0.78);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(14px);
  pointer-events: auto;
}
.viewer-modes button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  transition: background 0.3s, color 0.3s;
}
.viewer-modes button span {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-3);
  transition: color 0.3s;
}
.viewer-modes button:hover { color: var(--text); }
.viewer-modes button.is-active {
  background: rgba(38, 240, 255, 0.13);
  color: var(--cyan);
}
.viewer-modes button.is-active span { color: rgba(38, 240, 255, 0.65); }

.viewer-foot {
  position: absolute;
  left: 44px;
  right: 44px;
  bottom: 22px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--text-3);
}
.viewer-foot b { color: var(--text-2); }

/* 自动演示按钮 */
.viewer-demo {
  position: absolute;
  top: 44px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  background: rgba(8, 11, 15, 0.78);
  border: 1px solid var(--line);
  border-radius: 10px;
  backdrop-filter: blur(14px);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--text-2);
  pointer-events: auto;
  transition: border-color 0.3s, color 0.3s, box-shadow 0.3s;
}
.viewer-demo:hover { color: var(--cyan); border-color: rgba(38, 240, 255, 0.4); }
.viewer-demo.is-active {
  color: var(--cyan);
  border-color: rgba(38, 240, 255, 0.55);
  box-shadow: 0 0 18px rgba(38, 240, 255, 0.18);
}
.viewer-demo .demo-icon { font-size: 8px; }

/* 门架伸缩滑杆 */
.viewer-lift {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  background: rgba(8, 11, 15, 0.78);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(14px);
  pointer-events: auto;
}
.lift-value {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.lift-track {
  height: 120px;
  width: 22px;
  display: grid;
  place-items: center;
}
.lift-track input[type="range"] {
  width: 110px;
  transform: rotate(-90deg);
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: pointer;
}
.lift-track input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(38, 240, 255, 0.18), rgba(38, 240, 255, 0.55));
}
.lift-track input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5.5px;
  border-radius: 50%;
  background: var(--cyan);
  border: 2px solid #062a30;
  box-shadow: 0 0 10px rgba(38, 240, 255, 0.6);
}
.lift-track input[type="range"]::-moz-range-track {
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(38, 240, 255, 0.18), rgba(38, 240, 255, 0.55));
}
.lift-track input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  border: 2px solid #062a30;
  box-shadow: 0 0 10px rgba(38, 240, 255, 0.6);
}
.lift-label {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.2em;
  color: var(--text-3);
  writing-mode: vertical-rl;
}

.hero-scrollcue {
  position: relative;
  align-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 18px 0 26px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--text-3);
  transition: color 0.3s;
}
.hero-scrollcue:hover { color: var(--cyan); }
.hero-scrollcue i {
  width: 1px;
  height: 42px;
  background: linear-gradient(var(--cyan), transparent);
  animation: cue 2s var(--ease) infinite;
}
@keyframes cue {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ==========================================================================
   数据带
   ========================================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  border-top: 1px solid var(--line);
}
.stat {
  padding: clamp(36px, 4.5vw, 64px) clamp(16px, 2vw, 32px);
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: 0; }
.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(44px, 4.6vw, 72px);
  line-height: 1;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #fff, #7d99a4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label {
  display: block;
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.5;
}
.stat-label small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--text-3);
  margin-top: 5px;
}

/* ==========================================================================
   工程依据
   ========================================================================== */
.evidence { padding: var(--sec-y) 0 0; }
.evidence-grid {
  max-width: var(--maxw);
  margin: clamp(40px, 5vw, 72px) auto 0;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(12px, 1.6vw, 22px);
}
.evidence-card {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  cursor: zoom-in;
  transition: transform 0.5s var(--ease), border-color 0.4s, box-shadow 0.5s var(--ease);
}
.evidence-card:hover, .evidence-card:focus-visible {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}
.evidence-card-1 { grid-column: 1 / span 5; }
.evidence-card-2 { grid-column: 6 / span 7; }
.evidence-card-3 { grid-column: 1 / span 7; }
.evidence-card-4 { grid-column: 8 / span 5; }
.evidence-image {
  aspect-ratio: 16 / 10.5;
  overflow: hidden;
  background: linear-gradient(180deg, #e8ebee, #d9dee3);
  padding: clamp(10px, 1.6vw, 22px);
}
.evidence-card-2 .evidence-image, .evidence-card-4 .evidence-image { aspect-ratio: 16 / 11.5; }
.evidence-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.8s var(--ease);
  filter: saturate(0.95);
}
.evidence-card:hover .evidence-image img { transform: scale(1.045); }
.evidence-card figcaption {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border-top: 1px solid var(--line);
}
.evidence-no {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--orange);
}
.evidence-card figcaption b { display: block; font-size: 15px; letter-spacing: 0.02em; }
.evidence-card figcaption small { color: var(--text-3); font-size: 12px; }
.evidence-zoom { margin-left: auto; color: var(--text-3); font-size: 15px; transition: color 0.3s, transform 0.4s var(--ease); }
.evidence-card:hover .evidence-zoom { color: var(--cyan); transform: scale(1.15); }

/* 灯箱 */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: rgba(3, 4, 6, 0.9);
  backdrop-filter: blur(16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}
.lightbox.is-open { opacity: 1; pointer-events: auto; }
.lightbox figure { margin: 0; max-width: min(1200px, 92vw); }
.lightbox img {
  max-height: 82vh;
  width: auto;
  max-width: 100%;
  margin: 0 auto;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
}
.lightbox figcaption {
  text-align: center;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-2);
}
.lightbox button {
  position: absolute;
  top: 26px;
  right: 30px;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 22px;
  color: var(--text);
  transition: border-color 0.3s, color 0.3s, transform 0.3s;
}
.lightbox button:hover { border-color: var(--orange); color: var(--orange); transform: rotate(90deg); }

/* ==========================================================================
   产品宣言 + 特性
   ========================================================================== */
.product { padding: var(--sec-y) 0 0; }
.feature-grid {
  max-width: var(--maxw);
  margin: clamp(44px, 5vw, 72px) auto 0;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(12px, 1.4vw, 18px);
}
.feature-card {
  position: relative;
  padding: 30px 26px 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--surface), transparent 60%);
  overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.4s, background 0.4s;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(38, 240, 255, 0.3);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(38, 240, 255, 0.05);
  transition: border-color 0.4s, background 0.4s, transform 0.5s var(--ease);
}
.feature-card:hover .feature-icon {
  border-color: rgba(38, 240, 255, 0.5);
  background: rgba(38, 240, 255, 0.1);
  transform: scale(1.06);
}
.feature-icon svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.feature-no {
  position: absolute;
  top: 26px;
  right: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.14em;
}
.feature-card h3 { font-size: 21px; margin: 26px 0 12px; }
.feature-card p { color: var(--text-2); font-size: 13.5px; line-height: 1.85; }
.feature-line {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan), transparent 70%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s var(--ease);
}
.feature-card:hover .feature-line { transform: scaleX(1); }

/* ==========================================================================
   结构之旅（滚动三维分镜）
   ========================================================================== */
.structure { position: relative; height: 620vh; margin-top: var(--sec-y); background: var(--bg-1); }
.structure-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}
.structure-canvas-wrap { position: absolute; inset: 0; opacity: 0; transition: opacity 0.8s; }
.structure.js-3d-ready .structure-canvas-wrap { opacity: 1; }
#structure-3d { width: 100%; height: 100%; display: block; }

.structure-ui {
  position: absolute;
  inset: 0;
  display: none;
  pointer-events: none;
}
.structure.js-3d-ready .structure-ui { display: block; }
.structure-ui > .section-index {
  position: absolute;
  top: calc(var(--header-h) + 26px);
  left: var(--pad-x);
}

.structure-chapters { position: absolute; inset: 0; }
.structure-chapter {
  position: absolute;
  left: var(--pad-x);
  bottom: clamp(70px, 12vh, 130px);
  width: min(430px, 38vw);
  display: flex;
  gap: 20px;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 9, 12, 0.66);
  backdrop-filter: blur(18px) saturate(1.2);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.structure-chapter.is-active { opacity: 1; transform: translateY(0); }
.chapter-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.1em;
  flex: none;
  padding-top: 4px;
}
.chapter-en {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cyan);
  margin-bottom: 6px;
}
.structure-chapter h3 { font-size: 24px; margin-bottom: 10px; }
.structure-chapter p:last-child { color: var(--text-2); font-size: 13.5px; line-height: 1.85; }

.structure-progress {
  position: absolute;
  right: calc(var(--pad-x) - 6px);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}
.progress-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--text-2);
  writing-mode: vertical-rl;
}
.progress-rail {
  position: relative;
  width: 2px;
  height: 200px;
  background: rgba(148, 184, 196, 0.16);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
}
.progress-bar {
  position: absolute;
  inset: 0;
  background: linear-gradient(var(--cyan), var(--orange));
  transform: scaleY(0);
  transform-origin: top;
  border-radius: 2px;
}
.progress-dot {
  position: relative;
  z-index: 1;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--line-strong);
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.progress-dot.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}
.progress-hint {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.26em;
  color: var(--text-3);
  writing-mode: vertical-rl;
}

/* 静态分镜（无 3D 时） */
.structure-static { display: block; padding: calc(var(--header-h) + 40px) 0 60px; }
.structure.js-3d-ready .structure-static { display: none; }
.structure-static-grid {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.static-chapter {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--surface);
}
.static-chapter .chapter-no { color: var(--orange); }
.static-chapter h3 { font-size: 20px; margin: 8px 0 10px; }
.static-chapter p:last-child { color: var(--text-2); font-size: 13.5px; }

/* ==========================================================================
   工作流程
   ========================================================================== */
.workflow { padding: var(--sec-y) 0 0; }
.process-track {
  max-width: var(--maxw);
  margin: clamp(48px, 6vw, 80px) auto 0;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(20px, 3vw, 44px);
  position: relative;
}
.process-track::before {
  content: "";
  position: absolute;
  top: 25px;
  left: calc(var(--pad-x) + 25px);
  right: calc(var(--pad-x) + 25px);
  height: 1px;
  background: linear-gradient(90deg, var(--orange), var(--cyan), var(--purple));
  opacity: 0.4;
}
.process-step { position: relative; padding-top: 66px; }
.process-no {
  position: absolute;
  top: 0;
  left: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  transition: border-color 0.4s, box-shadow 0.4s, color 0.4s;
}
.process-step:hover .process-no {
  border-color: var(--orange);
  color: var(--orange);
  box-shadow: 0 0 24px rgba(255, 107, 26, 0.25);
}
.process-step h3 { font-size: 20px; margin-bottom: 10px; }
.process-step p { color: var(--text-2); font-size: 13.5px; line-height: 1.8; max-width: 260px; }

/* ==========================================================================
   系统架构
   ========================================================================== */
.architecture {
  margin-top: var(--sec-y);
  padding: var(--sec-y) var(--pad-x);
  background:
    radial-gradient(70% 90% at 85% 20%, rgba(139, 92, 255, 0.07), transparent 60%),
    var(--bg-1);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
}
.arch-copy h2 { font-size: clamp(32px, 3.8vw, 54px); line-height: 1.16; }

.arch-map {
  position: relative;
  aspect-ratio: 1 / 0.92;
  max-height: 560px;
}
.arch-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.arch-lines path {
  stroke: rgba(38, 240, 255, 0.28);
  stroke-width: 0.22;
  fill: none;
  stroke-dasharray: 1.4 1.4;
  animation: dashmove 22s linear infinite;
}
@keyframes dashmove { to { stroke-dashoffset: -56; } }
.arch-core {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 168px;
  height: 168px;
  border-radius: 50%;
  border: 1px solid rgba(38, 240, 255, 0.35);
  background: radial-gradient(circle, rgba(38, 240, 255, 0.1), rgba(5, 7, 10, 0.9) 70%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  box-shadow: 0 0 60px rgba(38, 240, 255, 0.12), inset 0 0 40px rgba(38, 240, 255, 0.06);
}
.arch-core img { width: 40px; height: auto; }
.arch-core strong { font-size: 14.5px; letter-spacing: 0.06em; }
.arch-core small { font-family: var(--font-mono); font-size: 8.5px; letter-spacing: 0.18em; color: var(--cyan); }
.arch-node {
  position: absolute;
  width: 180px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: rgba(10, 14, 19, 0.85);
  backdrop-filter: blur(8px);
  transition: border-color 0.4s, transform 0.4s var(--ease), box-shadow 0.4s;
}
.arch-node:hover {
  border-color: rgba(255, 107, 26, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}
.arch-node b { display: block; font-size: 14.5px; margin-bottom: 5px; }
.arch-node small { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.08em; color: var(--text-3); line-height: 1.6; display: block; }
.arch-node.n1 { left: 0; top: 6%; }
.arch-node.n2 { right: 0; top: 6%; }
.arch-node.n3 { left: 0; bottom: 6%; }
.arch-node.n4 { right: 0; bottom: 6%; }

/* ==========================================================================
   品牌系统
   ========================================================================== */
.brand {
  display: grid;
  grid-template-columns: minmax(0, 5.4fr) minmax(0, 6.6fr);
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--sec-y) var(--pad-x);
  gap: clamp(32px, 5vw, 90px);
  align-items: center;
}
.brand-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(80% 60% at 50% 42%, rgba(38, 240, 255, 0.08), transparent 65%),
    var(--bg-1);
  padding: clamp(36px, 4vw, 60px) clamp(24px, 3vw, 44px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(32px, 4vw, 52px);
}
.brand-logo-large { width: min(430px, 88%); filter: drop-shadow(0 0 26px rgba(38, 240, 255, 0.2)); }
.brand-formula {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-2);
}
.brand-formula i { color: var(--orange); font-style: normal; }
.brand-copy h2 { font-size: clamp(30px, 3.4vw, 48px); line-height: 1.18; }
.swatches { list-style: none; margin: 36px 0 0; padding: 0; }
.swatches li {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}
.swatches li:last-child { border-bottom: 1px solid var(--line); }
.swatch {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  flex: none;
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.swatch-black { background: #0d0e11; }
.swatch-orange { background: var(--orange); box-shadow: 0 0 16px rgba(255, 107, 26, 0.4); }
.swatch-cyan { background: var(--cyan); box-shadow: 0 0 16px rgba(38, 240, 255, 0.4); }
.swatch-purple { background: var(--purple); box-shadow: 0 0 16px rgba(139, 92, 255, 0.4); }
.swatches b { font-size: 14.5px; margin-right: 14px; }
.swatches small { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-3); letter-spacing: 0.06em; }

/* ==========================================================================
   价值
   ========================================================================== */
.impact { padding: 0 0 var(--sec-y); }
.impact-list {
  max-width: var(--maxw);
  margin: clamp(44px, 5vw, 64px) auto 0;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(14px, 1.8vw, 24px);
}
.impact-list article {
  position: relative;
  padding: 34px 30px 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), transparent);
  overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.4s;
}
.impact-list article:hover { transform: translateY(-5px); border-color: var(--line-strong); }
.impact-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}
.impact-list h3 {
  font-size: clamp(26px, 2.4vw, 34px);
  margin: 18px 0 14px;
}
.impact-list p { color: var(--text-2); font-size: 14px; line-height: 1.85; }

/* ==========================================================================
   项目状态 / 联系
   ========================================================================== */
.contact {
  position: relative;
  padding: calc(var(--sec-y) * 1.1) var(--pad-x);
  background:
    radial-gradient(60% 80% at 50% 110%, rgba(255, 107, 26, 0.09), transparent 60%),
    radial-gradient(50% 60% at 80% 0%, rgba(38, 240, 255, 0.06), transparent 60%),
    var(--bg-1);
  border-top: 1px solid var(--line);
  overflow: clip;
  text-align: center;
}
.contact-inner { max-width: 860px; margin: 0 auto; }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  border: 1px solid rgba(55, 224, 123, 0.35);
  border-radius: 999px;
  background: rgba(55, 224, 123, 0.07);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #7ce8a6;
}
.status-pill i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #37e07b;
  box-shadow: 0 0 10px #37e07b;
  animation: blink 2s infinite;
}
.contact h2 {
  font-size: clamp(36px, 5vw, 68px);
  line-height: 1.14;
  margin: 34px 0 30px;
}
.contact-copy p { color: var(--text-2); font-size: 16px; line-height: 1.9; max-width: 560px; margin: 0 auto 38px; }

/* ==========================================================================
   页尾
   ========================================================================== */
.site-footer {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 44px);
  flex-wrap: wrap;
  padding: 44px var(--pad-x);
  border-top: 1px solid var(--line);
  background: var(--bg-0);
}
.site-footer nav { display: flex; gap: 26px; }
.site-footer nav a { font-size: 13px; color: var(--text-2); transition: color 0.3s; }
.site-footer nav a:hover { color: var(--cyan); }
.footer-tag { font-size: 12.5px; color: var(--text-3); margin-left: auto; }
.footer-copy {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--text-3);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .viewer-callout { display: none; }
  .viewer-foot span { display: none; }
  .hero-inner { grid-template-columns: minmax(0, 5.6fr) minmax(0, 6.4fr); }
}

@media (max-width: 1020px) {
  .hero-inner { grid-template-columns: 1fr; gap: 20px; align-content: start; }
  .hero-copy { padding-bottom: 0; }
  .viewer-frame { aspect-ratio: 16 / 11; max-height: 60vh; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .architecture { grid-template-columns: 1fr; }
  .arch-map { max-width: 620px; margin: 0 auto; width: 100%; }
  .brand { grid-template-columns: 1fr; }
  .brand-panel { max-width: 560px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .stat { border-top: 1px solid var(--line); }
  .stat:nth-child(-n + 2) { border-top: 0; }
  .evidence-card-1, .evidence-card-2, .evidence-card-3, .evidence-card-4 { grid-column: span 6; }
}

@media (max-width: 900px) {
  /* 结构区回退为静态分镜流 */
  .structure { height: auto; }
  .structure-sticky { position: static; height: auto; overflow: visible; }
  .structure-canvas-wrap, .structure-ui { display: none !important; }
}

@media (max-width: 760px) {
  :root { --header-h: 64px; }
  .sys-status { display: none; }
  .header-cta { display: none; }
  .menu-toggle { display: block; }
  #site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(5, 7, 10, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--pad-x) 16px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  }
  #site-nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  #site-nav a { padding: 14px 0; border-top: 1px solid var(--line); font-size: 16px; }
  #site-nav a:first-child { border-top: 0; }

  .hero { padding-top: calc(var(--header-h) + 20px); }
  .hero-title { font-size: clamp(40px, 11vw, 56px); }
  .hero-meta { flex-wrap: wrap; gap: 12px 20px; }
  .hero-meta i { display: none; }
  .viewer-frame { aspect-ratio: 4 / 4.4; }
  .viewer-modes button { padding: 8px 13px; font-size: 12px; }
  .viewer-foot { display: none; }
  .viewer-topline { left: 20px; right: 20px; }
  .viewer-topline span { display: none; }
  /* 伸缩滑杆在移动端改为底部横条 */
  .viewer-lift {
    left: 14px;
    right: 14px;
    top: auto;
    bottom: 66px;
    transform: none;
    flex-direction: row;
    padding: 8px 14px;
    gap: 12px;
  }
  .lift-track { height: 22px; width: auto; flex: 1; }
  .lift-track input[type="range"] { width: 100%; transform: none; }
  .lift-label { writing-mode: horizontal-tb; }

  .stats { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .process-track { grid-template-columns: 1fr; gap: 34px; }
  .process-track::before { display: none; }
  .impact-list { grid-template-columns: 1fr; }
  .evidence-card-1, .evidence-card-2, .evidence-card-3, .evidence-card-4 { grid-column: span 12; }
  .arch-map {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    aspect-ratio: auto;
    max-height: none;
  }
  .arch-lines { display: none; }
  .arch-node { position: static; width: auto; padding: 14px 16px; }
  .arch-core {
    position: static;
    transform: none;
    grid-column: 1 / -1;
    justify-self: center;
    width: 140px;
    height: 140px;
    margin-bottom: 6px;
  }
  .site-footer { flex-direction: column; align-items: flex-start; }
  .footer-tag { margin-left: 0; }
}

/* ==========================================================================
   减少动态效果
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .hero-title .line-inner { transform: none; opacity: 1; }
  .structure { height: auto; }
  .structure-sticky { position: static; height: auto; overflow: visible; }
  .structure-canvas-wrap, .structure-ui { display: none !important; }
}