/* ============================================================
   迹原智行 — 官方设计系统
   工业机器人 · 数字孪生 · AI 巡检
   ============================================================ */

/* --- 设计令牌（Design Tokens）--- */
:root {
  /* 品牌主色 — 深空科技蓝 */
  --color-primary-50:  #e6f1ff;
  --color-primary-100: #cce3ff;
  --color-primary-200: #99c7ff;
  --color-primary-300: #66abff;
  --color-primary-400: #338fff;
  --color-primary-500: #0066ff;   /* 品牌蓝 */
  --color-primary-600: #0052cc;
  --color-primary-700: #003d99;
  --color-primary-800: #002966;
  --color-primary-900: #001433;

  /* 辅助色 — 冰蓝 */
  --color-cyan-400: #22d3ee;
  --color-cyan-500: #06b6d4;

  /* 高亮色 — 暖橙（安全/告警色，呼应工业） */
  --color-accent-400: #fb923c;
  --color-accent-500: #f97316;
  --color-accent-600: #ea580c;

  /* 信号色 */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger:  #ef4444;

  /* 中性色（深色优先） */
  --color-bg-0:    #050816;        /* 背景最深 */
  --color-bg-1:    #0a0f24;        /* 主背景 */
  --color-bg-2:    #111935;        /* 卡片背景 */
  --color-bg-3:    #1a2547;        /* 悬浮背景 */
  --color-border:  rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.16);

  /* 文字 */
  --color-text-primary:   #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted:     #94a3b8;
  --color-text-faint:     #64748b;

  /* 字体 */
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;

  /* 字号尺度（Major Third 1.25） */
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-md:   1.125rem;
  --fs-lg:   1.25rem;
  --fs-xl:   1.5rem;
  --fs-2xl:  1.875rem;
  --fs-3xl:  2.25rem;
  --fs-4xl:  3rem;
  --fs-5xl:  3.75rem;
  --fs-6xl:  4.5rem;

  /* 间距（8px 基准） */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* 圆角 */
  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg:  0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 32px rgba(0, 102, 255, 0.35);

  /* 缓动 */
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:    cubic-bezier(0.65, 0, 0.35, 1);

  /* 布局 */
  --container-max: 1400px;
  --nav-height:    72px;

  /* 动效 */
  --dur-fast:  150ms;
  --dur-base:  250ms;
  --dur-slow:  500ms;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text-secondary);
  background: var(--color-bg-1);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}
img, picture, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--dur-fast) var(--ease-out-expo); }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
ul, ol { list-style: none; }
input, textarea { font: inherit; }

/* --- 排版 --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.25rem, 5vw, var(--fs-6xl)); font-weight: 800; }
h2 { font-size: clamp(1.875rem, 3.5vw, var(--fs-4xl)); }
h3 { font-size: clamp(1.5rem, 2.5vw, var(--fs-2xl)); }
h4 { font-size: var(--fs-lg); }
h5 { font-size: var(--fs-md); }
h6 { font-size: var(--fs-base); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-cyan-400);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: var(--color-cyan-400);
}

.lead {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  max-width: 60ch;
  line-height: 1.7;
}

.gradient-text {
  background: linear-gradient(135deg, #66abff 0%, #22d3ee 50%, #fb923c 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* --- 布局工具 --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
@media (min-width: 768px) {
  .container { padding: 0 var(--space-8); }
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}
.section--lg { padding: var(--space-32) 0; }

@media (max-width: 640px) {
  .section, .section--lg { padding: var(--space-16) 0; }
}

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-16);
}
@media (min-width: 1024px) {
  .section__header { max-width: 960px; }
  .section__header p.lead { max-width: none; }
  .lead { max-width: none; }
}
.section__header p.lead {
  margin: var(--space-4) auto 0;
}

.grid { display: grid; gap: var(--space-6); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1024px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--dur-base) var(--ease-out-expo);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn--primary {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-400) 100%);
  color: white;
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.35);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.5);
}
.btn--ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  backdrop-filter: blur(10px);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-primary-400);
  color: var(--color-primary-300);
}
.btn .arrow {
  transition: transform var(--dur-base) var(--ease-out-expo);
}
.btn:hover .arrow { transform: translateX(4px); }

/* --- 卡片 --- */
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(26, 37, 71, 0.6) 0%, rgba(17, 25, 53, 0.4) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  backdrop-filter: blur(20px);
  transition: all var(--dur-base) var(--ease-out-expo);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.4), transparent 50%, rgba(34, 211, 238, 0.2));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out-expo);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  background: linear-gradient(180deg, rgba(26, 37, 71, 0.8) 0%, rgba(17, 25, 53, 0.6) 100%);
}
.card:hover::before { opacity: 1; }

/* --- 装饰背景 --- */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(102, 171, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(102, 171, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  pointer-events: none;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}
.bg-orb--blue {
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--color-primary-500) 0%, transparent 70%);
}
.bg-orb--cyan {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--color-cyan-500) 0%, transparent 70%);
}
.bg-orb--orange {
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--color-accent-500) 0%, transparent 70%);
}

/* --- 导航 --- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 100;
  transition: all var(--dur-base) var(--ease-out-expo);
  border-bottom: 1px solid transparent;
}
.navbar.is-scrolled {
  background: rgba(10, 15, 36, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--color-border);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.navbar__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: var(--fs-md);
  color: var(--color-text-primary);
}
.navbar__logo-mark {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-cyan-500));
  display: grid; place-items: center;
  color: white;
  font-weight: 800;
  box-shadow: 0 0 20px rgba(0, 102, 255, 0.4);
}
.navbar__logo-text {
  display: flex; flex-direction: column;
  line-height: 1.1;
}
.navbar__logo-text small {
  font-size: 0.625rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 2px;
}
.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.navbar__link {
  padding: 0.5rem 1rem;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--dur-fast) var(--ease-out-expo);
  position: relative;
}
.navbar__link:hover, .navbar__link.is-active {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.04);
}
.navbar__link.is-active::after {
  content: "";
  position: absolute;
  bottom: -4px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--color-cyan-400);
}
.navbar__cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.navbar__hamburger {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
}
.navbar__hamburger span {
  display: block; width: 18px; height: 2px;
  background: var(--color-text-primary);
  margin: 4px auto;
  transition: all var(--dur-base) var(--ease-out-expo);
}
@media (max-width: 900px) {
  .navbar__menu, .navbar__cta .btn--ghost { display: none; }
  .navbar__hamburger { display: block; }
  .navbar__menu.is-open {
    display: flex; flex-direction: column;
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: var(--color-bg-1);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    align-items: stretch;
  }
  .navbar__cta .btn--primary { display: none; }
}
@media (max-width: 900px) and (min-width: 641px) {
  .navbar__cta .btn--primary { display: inline-flex; }
}

/* --- 导航产品下拉菜单 --- */
.navbar__item {
  position: relative;
}
.navbar__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 480px;
  background: rgba(10, 15, 36, 0.96);
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  padding: var(--space-3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--dur-base) var(--ease-out-expo);
  z-index: 200;
  pointer-events: none;
}
.navbar__item:hover .navbar__dropdown,
.navbar__item.is-focused .navbar__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
/* 三级分类宽面板 */
.navbar__dropdown--wide {
  min-width: 560px;
  max-width: 620px;
}
.navbar__dropdown-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.navbar__dropdown-cat {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background var(--dur-fast);
}
.navbar__dropdown-cat:hover {
  background: rgba(255, 255, 255, 0.02);
}
.navbar__dropdown-cat-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}
.navbar__dropdown-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0,102,255,0.15), rgba(34,211,238,0.08));
  display: grid; place-items: center;
  font-size: 1.125rem;
  flex-shrink: 0;
}
.navbar__dropdown-name {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}
.navbar__dropdown-desc {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}
.navbar__dropdown-subitems {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-left: calc(36px + var(--space-3));
  padding-bottom: var(--space-1);
}
.navbar__dropdown-subitem {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--color-border);
  transition: all var(--dur-fast);
  text-decoration: none;
  white-space: nowrap;
}
.navbar__dropdown-subitem:hover {
  color: var(--color-cyan-400);
  background: rgba(0, 102, 255, 0.1);
  border-color: rgba(0, 102, 255, 0.2);
}
@media (max-width: 900px) {
  .navbar__dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    min-width: 0;
    max-width: none;
    background: rgba(255,255,255,0.03);
    border: none;
    box-shadow: none;
    padding: var(--space-2) 0;
    border-radius: 0;
  }
  .navbar__dropdown-categories {
    gap: var(--space-1);
  }
  .navbar__dropdown-subitems {
    padding-left: calc(36px + var(--space-3));
  }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(0, 102, 255, 0.12) 0%, transparent 60%),
              var(--color-bg-0);
}
.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-16);
  align-items: center;
  width: 100%;
  padding: var(--space-16) 0;
}
@media (max-width: 1024px) {
  .hero__inner { grid-template-columns: 1fr; gap: var(--space-10); }
}
.hero__title { line-height: 1.05; margin-bottom: var(--space-6); }
.hero__title .word { display: inline-block; opacity: 0; transform: translateY(20px); animation: rise 0.8s var(--ease-out-expo) forwards; }
.hero__title .word:nth-child(1) { animation-delay: 0.1s; }
.hero__title .word:nth-child(2) { animation-delay: 0.2s; }
.hero__title .word:nth-child(3) { animation-delay: 0.3s; }
.hero__title .word:nth-child(4) { animation-delay: 0.4s; }
.hero__title .word:nth-child(5) { animation-delay: 0.5s; }
.hero__desc {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  max-width: 56ch;
  margin-bottom: var(--space-8);
  opacity: 0;
  animation: rise 0.8s 0.6s var(--ease-out-expo) forwards;
}
.hero__actions {
  display: flex; flex-wrap: wrap;
  gap: var(--space-4);
  opacity: 0;
  animation: rise 0.8s 0.7s var(--ease-out-expo) forwards;
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  opacity: 0;
  animation: rise 0.8s 0.8s var(--ease-out-expo) forwards;
}
.hero__stat-num {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.hero__stat-num .unit { color: var(--color-cyan-400); }
.hero__stat-label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
@media (max-width: 640px) {
  .hero__stats { gap: var(--space-4); margin-top: var(--space-8); padding-top: var(--space-6); }
  .hero__stat-num { font-size: 1.75rem; }
  .hero__stat-label { font-size: 0.625rem; letter-spacing: 0.05em; }
}

.hero__visual {
  position: relative;
  aspect-ratio: 1;
  opacity: 0;
  animation: fadeIn 1.2s 0.5s var(--ease-out-expo) forwards;
}
.hero__visual-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  animation: spin 40s linear infinite;
}
.hero__visual-ring::before, .hero__visual-ring::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(102, 171, 255, 0.2);
}
.hero__visual-ring::before { inset: 8%; }
.hero__visual-ring::after { inset: 18%; border-style: solid; border-color: rgba(34, 211, 238, 0.15); animation: spin 60s linear infinite reverse; }
.hero__visual-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 70%; aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(0, 102, 255, 0.4), rgba(0, 20, 51, 0.9));
  box-shadow: 0 0 80px rgba(0, 102, 255, 0.5), inset 0 0 60px rgba(34, 211, 238, 0.2);
  display: grid; place-items: center;
  overflow: hidden;
}
.hero__visual-core::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0deg, var(--color-cyan-400) 90deg, transparent 180deg);
  filter: blur(8px);
  animation: spin 6s linear infinite;
  z-index: -1;
}
.hero__visual-core-icon {
  font-size: 4rem;
  color: white;
  text-shadow: 0 0 20px rgba(34, 211, 238, 0.6);
}
.hero__chip {
  position: absolute;
  background: rgba(17, 25, 53, 0.8);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
  display: flex; align-items: center; gap: 0.5rem;
  backdrop-filter: blur(10px);
  white-space: nowrap;
  animation: float 6s ease-in-out infinite;
}
.hero__chip-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-success); box-shadow: 0 0 8px var(--color-success); }
.hero__chip--1 { top: 10%; left: -5%; animation-delay: 0s; }
.hero__chip--2 { top: 50%; right: -8%; animation-delay: 1.5s; }
.hero__chip--3 { bottom: 12%; left: 5%; animation-delay: 3s; }
.hero__chip--4 { top: 25%; right: 10%; animation-delay: 4.5s; }

@keyframes rise {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn { to { opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* --- 数据指标栏 --- */
.metrics {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-0);
  padding: var(--space-12) 0;
}
.metrics__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}
@media (max-width: 768px) {
  .metrics__grid { grid-template-columns: repeat(2, 1fr); }
}
.metric__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-300), var(--color-cyan-400));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 0.5rem;
}
.metric__label {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* --- 特性卡 --- */
.feature-card {
  text-align: left;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.feature-card__icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.15), rgba(34, 211, 238, 0.1));
  display: grid; place-items: center;
  margin-bottom: var(--space-5);
  color: var(--color-cyan-400);
  border: 1px solid rgba(0, 102, 255, 0.2);
}
.feature-card__icon svg { width: 28px; height: 28px; }
.feature-card h3 { font-size: var(--fs-lg); margin-bottom: var(--space-3); color: var(--color-text-primary); }
.feature-card p { color: var(--color-text-muted); line-height: 1.7; flex: 1; }

/* --- 产品展示 --- */
.product {
  position: relative;
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-16) 0;
}
@media (min-width: 901px) {
  .product h2 { white-space: nowrap; }
  .product__list li { white-space: nowrap; }
}
@media (max-width: 900px) {
  .product { grid-template-columns: 1fr; gap: var(--space-10); }
  .product { padding: var(--space-10) 0; }
}
.product--reverse { direction: rtl; }
.product--reverse > * { direction: ltr; }
@media (max-width: 900px) { .product--reverse { direction: ltr; } }

.product__media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: linear-gradient(180deg, var(--color-bg-2), var(--color-bg-1));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  display: grid; place-items: center;
}
.product__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
  transition: transform var(--dur-slow) var(--ease-out-expo);
}
@media (max-width: 640px) {
  .product__media img { width: 100%; height: 100%; }
}
.product__media:hover img { transform: scale(1.05) rotate(-2deg); }
.product__media::before {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 50%;
  background: linear-gradient(180deg, transparent, rgba(0, 102, 255, 0.1));
  pointer-events: none;
}
.product__media-label {
  position: absolute;
  top: var(--space-4); left: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-cyan-400);
  background: rgba(0, 0, 0, 0.4);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}
.product__list { list-style: none; }
.product__list li {
  display: flex; align-items: flex-start; gap: 0.75rem;
  padding: var(--space-3) 0;
  border-bottom: 1px dashed var(--color-border);
  color: var(--color-text-secondary);
}
.product__list li::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-cyan-400);
  margin-top: 0.55rem;
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--color-cyan-400);
}
.product__list li strong { color: var(--color-text-primary); font-weight: 600; margin-right: 0.5rem; }

/* --- 应用场景 --- */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-3);
}
@media (max-width: 1024px) { .scene-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .scene-grid { grid-template-columns: repeat(2, 1fr); } }
.scene-tile {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-bg-2), var(--color-bg-1));
  display: grid; place-items: center;
  text-align: center;
  padding: var(--space-3);
  transition: all var(--dur-base) var(--ease-out-expo);
  cursor: default;
  overflow: hidden;
}
.scene-tile::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at center, rgba(0, 102, 255, 0.2), transparent 70%);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out-expo);
}
.scene-tile:hover {
  border-color: var(--color-primary-400);
  transform: translateY(-2px);
}
.scene-tile:hover::before { opacity: 1; }
.scene-tile__icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.scene-tile__name { font-size: var(--fs-sm); color: var(--color-text-primary); font-weight: 500; }

/* --- 关于我们 --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}
.about-stat {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.about-stat__num {
  font-family: var(--font-mono);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--color-cyan-400);
  line-height: 1;
}
.about-stat__label {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}
.about-visual {
  position: relative;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-bg-2), var(--color-bg-1));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  display: grid; place-items: center;
  overflow: hidden;
}
.about-visual__logo {
  font-size: 8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-300), var(--color-cyan-400));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.05em;
}
.about-visual__orbit {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px dashed var(--color-border-strong);
  animation: spin 30s linear infinite;
}
.about-visual__orbit::before {
  content: "";
  position: absolute;
  top: 10%; left: 50%;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--color-cyan-400);
  box-shadow: 0 0 16px var(--color-cyan-400);
  transform: translateX(-50%);
}

/* --- 时间线 / 里程碑 --- */
.timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: var(--space-8);
}
.timeline::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--color-primary-500) 10%, var(--color-cyan-500) 50%, var(--color-primary-500) 90%, transparent);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-10);
}
.timeline__item::before {
  content: "";
  position: absolute;
  left: -2rem; top: 0.4rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--color-bg-1);
  border: 2px solid var(--color-cyan-400);
  box-shadow: 0 0 12px var(--color-cyan-400);
}
.timeline__year {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-cyan-400);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.timeline__title {
  font-size: var(--fs-lg);
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.timeline__desc { color: var(--color-text-muted); }

/* --- 平台展示 --- */
.platform-card {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--dur-base) var(--ease-out-expo);
}
.platform-card:hover {
  border-color: var(--color-primary-400);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.platform-card__media {
  aspect-ratio: 16 / 10;
  background: var(--color-bg-0);
  overflow: hidden;
  position: relative;
}
.platform-card__media img {
  width: 100%; height: 100%;
  object-fit: fill;
  transition: transform var(--dur-slow) var(--ease-out-expo);
}
.platform-card:hover .platform-card__media img { transform: scale(1.05); }
.platform-card__body { padding: var(--space-6); }
.platform-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-cyan-400);
  background: rgba(34, 211, 238, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}
.platform-card h3 { margin-bottom: var(--space-2); }
.platform-card p { color: var(--color-text-muted); }

/* --- 联系表单 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-12);
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-info {
  background: linear-gradient(180deg, var(--color-bg-2), var(--color-bg-1));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
}
.contact-info h3 { margin-bottom: var(--space-6); }
.contact-item {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-item:last-child { border-bottom: 0; }
.contact-item__icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: rgba(0, 102, 255, 0.1);
  display: grid; place-items: center;
  color: var(--color-cyan-400);
  flex-shrink: 0;
}
.contact-item__label { font-size: var(--fs-xs); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.1em; }
.contact-item__value { color: var(--color-text-primary); font-weight: 500; margin-top: 0.25rem; }

.form {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.form-group { margin-bottom: var(--space-5); }
.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}
.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-bg-0);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--fs-sm);
  transition: all var(--dur-fast) var(--ease-out-expo);
}
.form-control:focus {
  outline: 0;
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.2);
}
.form-control::placeholder { color: var(--color-text-faint); }
textarea.form-control { min-height: 140px; resize: vertical; font-family: inherit; }

/* --- 页脚 --- */
.footer {
  background: var(--color-bg-0);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}
@media (max-width: 768px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer__grid { grid-template-columns: 1fr; }
}
.footer__brand { max-width: 320px; }
.footer__brand p { color: var(--color-text-muted); margin: var(--space-4) 0 var(--space-6); font-size: var(--fs-sm); }
.footer__socials { display: flex; gap: var(--space-3); }
.footer__social {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  display: grid; place-items: center;
  color: var(--color-text-muted);
  transition: all var(--dur-fast) var(--ease-out-expo);
}
.footer__social:hover {
  border-color: var(--color-primary-400);
  color: var(--color-primary-300);
  transform: translateY(-2px);
}
.footer__col h4 { font-size: var(--fs-sm); color: var(--color-text-primary); margin-bottom: var(--space-4); letter-spacing: 0.05em; }
.footer__col ul li { margin-bottom: var(--space-3); }
.footer__col ul a {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  transition: color var(--dur-fast) var(--ease-out-expo);
}
.footer__col ul a:hover { color: var(--color-primary-300); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
}
@media (max-width: 640px) { .footer__bottom { flex-direction: column; gap: var(--space-3); text-align: center; } }

/* --- 页面切换动画 --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* --- 滚动条 --- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--color-bg-0); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-primary-700), var(--color-primary-500));
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary-400); }

/* --- 移动端触摸优化 --- */
@media (hover: none) {
  .card:hover, .platform-card:hover, .scene-tile:hover { transform: none; }
  .product__media:hover img { transform: none; }
  .btn--primary:hover { transform: none; }
}
@media (max-width: 640px) {
  .card { padding: var(--space-6); }
  .lead { font-size: var(--fs-base); }
  .eyebrow { letter-spacing: 0.12em; }
  .timeline { padding-left: var(--space-5); }
  .timeline__item::before { left: -1.4rem; }
}

/* --- 选中 --- */
::selection { background: var(--color-primary-500); color: white; }

/* --- 工具类 --- */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }