:root {
  --bg: #ffffff;
  --bg-soft: #f4f4f1;
  --surface: #f6f6f3;
  --ink: #0e0e0e;
  --text: #141414;
  --muted: #6f6f6f;
  --line: rgba(0, 0, 0, 0.1);
  --line-strong: rgba(0, 0, 0, 0.18);
  --serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --radius: 14px;
  --container: 1160px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- 页面微倾 ---------- */
#tiltWrapper {
  will-change: transform;
}

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

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 细腻纹理 ---------- */
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: 0.05;
  mix-blend-mode: multiply;
  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' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 进度条 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: var(--ink); z-index: 100;
  pointer-events: none;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 28px; border-radius: 999px; font-weight: 500; font-size: 15px; letter-spacing: .3px;
  cursor: pointer; border: 1px solid transparent; position: relative; overflow: hidden;
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), color .4s, border-color .4s;
  will-change: transform;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0, 0, 0, .18); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn-lg { padding: 16px 38px; font-size: 16px; }

/* ---------- 导航 · 沉浸式毛玻璃 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 90;
  pointer-events: none;
}
/* 毛玻璃背景层：独立承载模糊与渐变，向下铺展并随遮罩渐隐，无硬边 */
.site-header::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 256px;  /* 导航高度 76 + 向下铺展 180 */
  /* 顶部实、向下渐隐；顶部叠一层高光描边提升质感 */
  background:
    linear-gradient(180deg,
      rgba(255,255,255,.72) 0%,
      rgba(255,255,255,.55) 22%,
      rgba(255,255,255,.36) 45%,
      rgba(255,255,255,.16) 70%,
      rgba(255,255,255,.05) 90%,
      transparent 100%),
    linear-gradient(180deg, rgba(255,255,255,.9), rgba(255,255,255,0) 6px);
  /* 高级毛玻璃：细节模糊 + 色彩增强 + 轻微亮度，玻璃通透感 */
  backdrop-filter: blur(16px) saturate(170%) brightness(1.04);
  -webkit-backdrop-filter: blur(16px) saturate(170%) brightness(1.04);
  /* 顶部高光描边 + 底部柔和投影，悬浮玻璃质感而非生硬线条 */
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.7),
    0 8px 30px rgba(15,23,42,.08);
  /* 导航本体不透明，模糊与渐变一起向下平滑消散 */
  -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 76px, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0, #000 76px, transparent 100%);
  pointer-events: none;
  z-index: -1;
  transition: background .5s var(--ease), backdrop-filter .5s var(--ease), box-shadow .5s var(--ease);
}
.site-header.scrolled::before {
  background:
    linear-gradient(180deg,
      rgba(255,255,255,.82) 0%,
      rgba(255,255,255,.68) 20%,
      rgba(255,255,255,.48) 42%,
      rgba(255,255,255,.26) 66%,
      rgba(255,255,255,.09) 88%,
      transparent 100%),
    linear-gradient(180deg, rgba(255,255,255,.95), rgba(255,255,255,0) 6px);
  backdrop-filter: blur(22px) saturate(180%) brightness(1.05);
  -webkit-backdrop-filter: blur(22px) saturate(180%) brightness(1.05);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.8),
    0 10px 34px rgba(15,23,42,.10);
}
.site-header .nav { pointer-events: auto; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--serif); font-weight: 700; font-size: 20px; letter-spacing: .5px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 7px; object-fit: cover;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.brand:hover .brand-mark { transform: translateY(-1px) scale(1.04); box-shadow: 0 6px 18px rgba(0, 0, 0, .15); }
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  color: var(--muted); font-size: 15px; position: relative; padding: 4px 0;
  transition: color .3s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: var(--ink); transform: scaleX(0); transform-origin: 100% 50%;
  transition: transform .4s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); transform-origin: 0 50%; }
.nav-cta { padding: 9px 22px; font-size: 14px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .35s var(--ease); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: visible; }
.hero-bg { position: absolute; inset: -15% 0; z-index: 0; }
.hero-bg::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(60% 50% at 20% 20%, rgba(0, 0, 0, 0.05), transparent 70%),
    radial-gradient(50% 50% at 85% 75%, rgba(0, 0, 0, 0.04), transparent 70%);
}
.blob { position: absolute; border-radius: 50%; will-change: transform; }
.blob-1 { width: 500px; height: 500px; background: rgba(0,0,0,.12); top: -120px; left: -80px; filter: blur(80px); }
.blob-2 { width: 440px; height: 440px; background: rgba(0,0,0,.1); bottom: -140px; right: -60px; filter: blur(70px); }
.blob-3 { width: 350px; height: 350px; background: rgba(0,0,0,.07); top: 35%; left: 50%; filter: blur(60px); }

.hero-inner { position: relative; z-index: 2; padding-top: 90px; }
/* 右侧大图画框 */
.hero-frame {
  position: absolute;
  right: 2%;
  bottom: 6%;
  width: clamp(300px, 40vw, 550px);
  background: #fff;
  border-radius: 12px;
  box-shadow:
    0 4px 8px rgba(0,0,0,.04),
    0 12px 28px rgba(0,0,0,.08),
    0 30px 70px rgba(0,0,0,.12);
  padding: 6px;
  padding-top: 38px;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  will-change: transform, opacity;
}
.hero-frame-bar {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 38px;
  background: #f6f6f3;
  border-radius: 12px 12px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 14px;
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-red    { background: #ff5f57; }
.dot-yellow { background: #ffbd2e; }
.dot-green  { background: #28c840; }
.hero-img {
  width: 100%;
  height: auto;
  max-height: 55vh;
  object-fit: cover;
  display: block;
  border-radius: 7px;
}
.hero-eyebrow {
  display: inline-block; letter-spacing: 4px; font-size: 12px; font-weight: 500;
  color: var(--muted); padding: 7px 16px; border: 1px solid var(--line);
  border-radius: 999px; margin-bottom: 26px;
}
.hero-title { font-family: var(--serif); font-size: clamp(2.6rem, 6.5vw, 5rem); line-height: 1.1; font-weight: 900; letter-spacing: -1px; }
.text-red { color: #c62828; }
.hero-title .line { display: block; overflow: hidden; padding-bottom: .04em; }
.hero-title .line-inner { display: block; will-change: transform; }
.grad { font-style: italic; font-weight: 700; position: relative; }
.grad::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .08em; height: 2px;
  background: var(--ink); transform: scaleX(0); transform-origin: 0 50%;
  transition: transform .6s var(--ease);
}
.hero-title .line:hover .grad::after { transform: scaleX(1); }
.hero-sub { margin: 30px 0 38px; max-width: 540px; color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.18rem); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll { margin-top: 80px; display: flex; align-items: center; gap: 14px; color: var(--muted); font-size: 12px; letter-spacing: 2px; }
.mouse { width: 22px; height: 36px; border: 1.5px solid var(--line-strong); border-radius: 14px; display: flex; justify-content: center; padding-top: 7px; }
.wheel { width: 3px; height: 7px; border-radius: 2px; background: var(--ink); }

/* ---------- 通用 section ---------- */
.section { padding: clamp(90px, 13vw, 150px) 0; position: relative; z-index: 2; }
.section-head { max-width: 660px; margin: 0 auto clamp(54px, 7vw, 84px); text-align: center; }
.section-eyebrow { color: var(--muted); letter-spacing: 3px; font-size: 12px; font-weight: 500; text-transform: uppercase; }
.section-title { font-family: var(--serif); font-size: clamp(1.9rem, 4vw, 3rem); font-weight: 700; margin: 14px 0 16px; letter-spacing: -.5px; }
.section-desc { color: var(--muted); }

.grid { display: grid; gap: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 38px 30px; transition: transform .45s var(--ease), border-color .45s, box-shadow .45s, background .45s;
}
.card:hover { transform: translateY(-8px); border-color: var(--line-strong); box-shadow: 0 24px 60px rgba(0, 0, 0, .08); background: #fff; }
.card h3 { font-family: var(--serif); font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; }
.card p { color: var(--muted); font-size: .96rem; }
.card-role {
  font-size: .88rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .5px;
  margin-bottom: 2px;
}
.card-org {
  font-size: .78rem;
  color: var(--muted);
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.card-quote {
  font-family: var(--serif);
  font-size: .9rem;
  color: var(--ink);
  font-style: italic;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  line-height: 1.6;
  opacity: .8;
}
.card-avatar {
  width: 72px; height: 72px; border-radius: 50%; object-fit: cover;
  margin-bottom: 22px; display: block;
  border: 2px solid var(--line);
  transition: border-color .4s var(--ease), transform .4s var(--ease);
}
.card:hover .card-avatar {
  border-color: var(--line-strong);
  transform: scale(1.06);
}

/* ---------- 展示 ---------- */
.showcase-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(34px, 6vw, 80px);
  align-items: center; margin-bottom: clamp(80px, 11vw, 140px);
}
.showcase-row.reverse .showcase-media { order: 2; }
/* 画框容器 */
.showcase-media {
  position: relative;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  /* 画框白色卡纸 + 细腻阴影 */
  background: #fff;
  padding: clamp(18px, 3vw, 30px);
  box-shadow:
    0 2px 4px rgba(0,0,0,.04),
    0 8px 16px rgba(0,0,0,.06),
    0 20px 40px rgba(0,0,0,.1);
  border-radius: 4px;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
/* 第一张：微微右倾 */
.showcase-row .showcase-media {
  transform: rotate(1.5deg);
}
/* 第二张：微微左倾 */
.showcase-row.reverse .showcase-media {
  transform: rotate(-1.8deg);
}
.showcase-media:hover {
  box-shadow:
    0 2px 4px rgba(0,0,0,.04),
    0 12px 24px rgba(0,0,0,.08),
    0 30px 60px rgba(0,0,0,.14);
  transform: rotate(0deg) scale(1.02) !important;
}
/* 图片本身带细内边框 */
.showcase-img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  border-radius: 2px;
  outline: 1px solid rgba(0,0,0,.08);
  outline-offset: -1px;
  transition: transform .6s var(--ease);
}
/* 画框底部标签 */
.showcase-media::after {
  content: "MR · 中国明日车队";
  position: absolute;
  bottom: -32px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--serif);
  font-size: .7rem;
  color: var(--muted);
  letter-spacing: 2px;
  white-space: nowrap;
  opacity: .6;
}
.showcase-text h3 { font-family: var(--serif); font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; margin-bottom: 16px; }
.showcase-text p { color: var(--muted); margin-bottom: 20px; }
.link { color: var(--ink); font-weight: 500; position: relative; }
.link::after { content: ""; position: absolute; left: 0; bottom: -3px; height: 1px; width: 100%; background: var(--ink); transform: scaleX(0); transform-origin: 100% 50%; transition: transform .4s var(--ease); }
.link:hover::after { transform: scaleX(1); transform-origin: 0 50%; }

/* ---------- CTA（红白醒目标识，鼠标下压交互） ---------- */
.cta { perspective: 800px; }
.cta-inner {
  text-align: center; max-width: 720px; margin: 0 auto; position: relative;
  background:
    /* 斜交网格（白色细线） */
    repeating-linear-gradient(60deg, rgba(255,255,255,.04) 0px, rgba(255,255,255,.07) 1px, transparent 1px, transparent 34px),
    repeating-linear-gradient(-60deg, rgba(255,255,255,.04) 0px, rgba(255,255,255,.07) 1px, transparent 1px, transparent 34px),
    /* 微点纹理 */
    radial-gradient(circle at 25% 30%, rgba(255,255,255,.06) 1px, transparent 1px),
    radial-gradient(circle at 70% 60%, rgba(255,255,255,.04) 1px, transparent 1px),
    /* 左下暖光 */
    radial-gradient(circle at 10% 90%, rgba(255,255,255,.12), transparent 50%),
    /* 右下微光 */
    radial-gradient(circle at 85% 80%, rgba(255,255,255,.05), transparent 40%),
    #c62828;
  background-size: auto, auto, 80px 80px, 60px 60px, auto, auto, auto;
  color: #fff; border-radius: 26px;
  padding: clamp(56px, 8vw, 90px) 32px;
  /* 浮起投影 */
  box-shadow:
    0 20px 50px rgba(198, 40, 40, .35),
    0 4px 14px rgba(0, 0, 0, .15);
  /* 过渡：下压动画 */
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), filter .45s var(--ease);
  cursor: pointer;
  -webkit-user-select: none; user-select: none;
}

/* 鼠标悬停 · 下压效果 */
.cta-inner:hover {
  transform: translateY(3px) scale(0.97);
  box-shadow:
    0 6px 24px rgba(198, 40, 40, .3);
  filter: brightness(.94);
}

/* 右上角大光源 */
.cta-inner::before {
  content: ""; position: absolute; width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(255,255,255,.14), rgba(255,255,255,.04) 40%, transparent 70%);
  top: -320px; right: -180px;
  pointer-events: none;
}

/* 渐变流光边框 · 白红配色 */
.cta-inner::after {
  content: ""; position: absolute; inset: -2px; border-radius: 28px; padding: 2px;
  background: conic-gradient(
    from 0deg,
    transparent 0%,
    rgba(255,255,255,.25) 25%,
    rgba(255,200,200,.12) 50%,
    transparent 75%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  animation: ctaShine 7s linear infinite;
  will-change: transform;
  transition: opacity .4s;
}
.cta-inner:hover::after { opacity: .5; }

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

.cta-badge {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.45);
  color: rgba(255,255,255,.85);
  font-size: .75rem;
  letter-spacing: 6px;
  padding: 6px 22px;
  border-radius: 999px;
  margin-bottom: 24px;
  font-family: var(--serif);
}
.cta-title { font-family: var(--serif); font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 16px; position: relative; }
.cta-sub { color: rgba(255, 255, 255, .78); margin-bottom: 32px; position: relative; }
.cta .btn-primary { background: #fff; color: #c62828; }
.cta .btn-primary:hover { box-shadow: 0 14px 36px rgba(255, 255, 255, .25); transform: translateY(-2px); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 52px 0; background: var(--bg); position: relative; z-index: 2; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 18px; }
.footer-brand { display: flex; align-items: center; gap: 12px; font-family: var(--serif); font-weight: 700; font-size: 18px; }
.footer-brand .brand-mark { width: 30px; height: 30px; }
.footer-links { display: flex; gap: 26px; }
.footer-links a { color: var(--muted); font-size: 14px; transition: color .3s; position: relative; }
.footer-links a:hover { color: var(--ink); }
.footer-copy { color: var(--muted); font-size: 13px; width: 100%; border-top: 1px solid var(--line); padding-top: 20px; margin-top: 6px; }
.footer-credit {
  color: var(--muted);
  font-size: 12px;
  width: 100%;
  padding-top: 8px;
  opacity: .6;
  letter-spacing: 1px;
}

/* ---------- 进场初始态 ---------- */
.js [data-anim], .js .reveal { opacity: 0; }

/* ---------- 无障碍 / 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .showcase-row, .showcase-row.reverse { grid-template-columns: 1fr; }
  .showcase-row.reverse .showcase-media { order: 0; }
  .hero-frame { display: none; }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 76px; left: 0; right: 0;
    background: rgba(255, 255, 255, .82); backdrop-filter: blur(18px); padding: 26px; gap: 20px;
    box-shadow: 0 4px 24px rgba(0,0,0,.06);
  }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero-scroll { display: none; }
}