/* =========================
   淮北市畅通工程技术有限公司官网
   3D 视觉风格 · 深色科技感
   ========================= */

:root {
  --bg-deep: #04070f;
  --bg-dark: #0a1220;
  --bg-mid: #111a2e;
  --bg-card: rgba(17, 26, 46, 0.65);
  --border-glass: rgba(100, 160, 255, 0.18);
  --border-strong: rgba(100, 160, 255, 0.35);

  --primary: #3d8bff;
  --primary-light: #6ba8ff;
  --primary-deep: #1e5fd9;
  --accent: #00d4ff;
  --accent-warm: #ff8a3d;
  --success: #3ddc97;

  --text-primary: #e8f0ff;
  --text-secondary: rgba(232, 240, 255, 0.72);
  --text-tertiary: rgba(232, 240, 255, 0.48);

  --shadow-3d: 0 20px 60px -12px rgba(0, 20, 60, 0.6), 0 8px 20px -6px rgba(0, 20, 60, 0.4);
  --shadow-glow: 0 0 40px rgba(61, 139, 255, 0.25);
  --shadow-inner: inset 0 1px 0 rgba(255, 255, 255, 0.06);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;

  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 3D 透视容器 */
.scene-3d {
  perspective: 1600px;
  perspective-origin: 50% 30%;
}

.card-3d {
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.5s ease;
}

.card-3d:hover {
  transform: translateZ(30px) rotateX(3deg) rotateY(-3deg);
  box-shadow: var(--shadow-3d), var(--shadow-glow);
}

.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-inner), var(--shadow-3d);
}

.glass-strong {
  background: rgba(10, 18, 32, 0.75);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid var(--border-strong);
}

/* 渐变文字 */
.gradient-text {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 50%, var(--primary-light) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 6s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

/* 发光边框 */
.glow-border {
  position: relative;
}
.glow-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--primary), var(--accent), transparent 70%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}
.glow-border:hover::before {
  opacity: 1;
}

/* 3D 浮动动画 */
@keyframes float-3d {
  0%, 100% { transform: translateY(0) translateZ(0); }
  50% { transform: translateY(-12px) translateZ(20px); }
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); opacity: 0.8; }
  100% { transform: scale(1.6); opacity: 0; }
}

@keyframes orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes grid-scroll {
  0% { transform: translateY(0); }
  100% { transform: translateY(60px); }
}

/* 导航栏 */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.4s ease;
}
.nav-bar.scrolled {
  background: rgba(4, 7, 15, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-glass);
  padding: 12px 40px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.5px;
}
.nav-logo .logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(61, 139, 255, 0.4);
  position: relative;
}
.nav-logo .logo-mark::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 8px;
  background: var(--bg-dark);
}
.nav-logo .logo-mark svg {
  position: relative;
  z-index: 1;
  width: 20px;
  height: 20px;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
  border-radius: 1px;
}
.nav-links a:hover {
  color: var(--text-primary);
}
.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: #fff;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(61, 139, 255, 0.35);
  transition: all 0.3s ease;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(61, 139, 255, 0.5);
}

.nav-mobile-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 6px;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  padding: 120px 40px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-image {
  position: absolute;
  inset: 0;
  background-image: url('assets/images/city3.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
  filter: saturate(1.2) contrast(1.1);
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 40%, rgba(61, 139, 255, 0.25) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 60%, rgba(0, 212, 255, 0.18) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-deep) 0%, rgba(4, 7, 15, 0.6) 40%, var(--bg-deep) 100%);
}

/* 3D 网格地面 */
.hero-grid {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 200%;
  height: 60vh;
  transform: translateX(-50%) rotateX(70deg);
  transform-origin: center bottom;
  background-image:
    linear-gradient(rgba(61, 139, 255, 0.2) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 139, 255, 0.2) 1px, transparent 1px);
  background-size: 60px 60px;
  perspective: 1000px;
  opacity: 0.6;
  animation: grid-scroll 8s linear infinite;
  mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-text .hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: rgba(61, 139, 255, 0.12);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  font-size: 14px;
  color: var(--primary-light);
  margin-bottom: 28px;
  font-weight: 500;
}
.hero-eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
  animation: pulse 2s ease infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-text h1 {
  font-size: clamp(38px, 5.2vw, 72px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.hero-text h1 .line {
  display: block;
}

.hero-text .hero-sub {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(61, 139, 255, 0.4);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(61, 139, 255, 0.55);
}

.btn-ghost {
  padding: 16px 32px;
  background: rgba(61, 139, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.btn-ghost:hover {
  background: rgba(61, 139, 255, 0.18);
  border-color: var(--primary-light);
  transform: translateY(-3px);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border-glass);
}
.hero-stat .stat-num {
  font-size: 32px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 6px;
}
.hero-stat .stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* Hero 右侧 3D 可视化 */
.hero-visual {
  position: relative;
  height: 520px;
  perspective: 1200px;
}

.visual-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 420px;
  height: 420px;
  transform-style: preserve-3d;
}

.visual-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotateX(15deg) rotateY(-15deg);
  width: 200px;
  height: 200px;
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(61, 139, 255, 0.4), rgba(0, 212, 255, 0.2)),
    var(--bg-mid);
  border: 1px solid var(--border-strong);
  box-shadow:
    0 30px 80px rgba(0, 20, 60, 0.6),
    0 0 60px rgba(61, 139, 255, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: core-float 6s ease-in-out infinite;
}
@keyframes core-float {
  0%, 100% { transform: translate(-50%, -50%) rotateX(15deg) rotateY(-15deg) translateY(0); }
  50% { transform: translate(-50%, -50%) rotateX(15deg) rotateY(-15deg) translateY(-15px); }
}
.visual-core svg {
  width: 80px;
  height: 80px;
  color: var(--accent);
  filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.6));
}

.orbit-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(61, 139, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transform-style: preserve-3d;
}
.orbit-ring.r1 {
  width: 280px;
  height: 280px;
  transform: translate(-50%, -50%) rotateX(65deg);
  animation: orbit-spin 20s linear infinite;
}
.orbit-ring.r2 {
  width: 340px;
  height: 340px;
  transform: translate(-50%, -50%) rotateX(70deg) rotateY(30deg);
  animation: orbit-spin-rev 25s linear infinite;
}
.orbit-ring.r3 {
  width: 400px;
  height: 400px;
  transform: translate(-50%, -50%) rotateX(60deg) rotateY(-25deg);
  animation: orbit-spin 30s linear infinite;
}

@keyframes orbit-spin {
  from { transform: translate(-50%, -50%) rotateX(65deg) rotateZ(0deg); }
  to { transform: translate(-50%, -50%) rotateX(65deg) rotateZ(360deg); }
}
@keyframes orbit-spin-rev {
  from { transform: translate(-50%, -50%) rotateX(70deg) rotateY(30deg) rotateZ(0deg); }
  to { transform: translate(-50%, -50%) rotateX(70deg) rotateY(30deg) rotateZ(-360deg); }
}

.orbit-node {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 20px var(--accent), 0 0 40px rgba(0, 212, 255, 0.5);
}
.orbit-ring.r1 .orbit-node { top: -7px; left: 50%; margin-left: -7px; }
.orbit-ring.r2 .orbit-node { top: 50%; right: -7px; margin-top: -7px; }
.orbit-ring.r3 .orbit-node { bottom: -7px; left: 30%; margin-left: -7px; background: var(--primary-light); box-shadow: 0 0 20px var(--primary-light); }

.visual-particles .particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary-light);
  box-shadow: 0 0 10px var(--primary-light);
  opacity: 0.6;
}
.particle.p1 { top: 15%; left: 20%; animation: particle-float 7s ease-in-out infinite; }
.particle.p2 { top: 25%; right: 15%; animation: particle-float 9s ease-in-out infinite 1s; }
.particle.p3 { bottom: 20%; left: 25%; animation: particle-float 8s ease-in-out infinite 2s; }
.particle.p4 { bottom: 30%; right: 20%; animation: particle-float 6s ease-in-out infinite 0.5s; }
.particle.p5 { top: 45%; left: 10%; animation: particle-float 10s ease-in-out infinite 1.5s; }
@keyframes particle-float {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
  50% { transform: translateY(-25px) scale(1.3); opacity: 1; }
}

/* Section 通用 */
.section {
  position: relative;
  padding: 120px 40px;
}

.section-inner {
  max-width: 1400px;
  margin: 0 auto;
}

.section-head {
  text-align: center;
  margin-bottom: 70px;
}
.section-head .section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(61, 139, 255, 0.12);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 20px;
  font-weight: 500;
  letter-spacing: 1px;
}
.section-head h2 {
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}
.section-head .section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* 关于我们 */
.about-section {
  background: var(--bg-dark);
}
.about-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: center;
}

.about-visual {
  position: relative;
  perspective: 1200px;
  height: 480px;
}

.about-image-wrap {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transform-style: preserve-3d;
  transform: rotateY(-8deg) rotateX(4deg);
  box-shadow:
    -30px 30px 60px rgba(0, 0, 0, 0.5),
    0 0 0 1px var(--border-glass);
  transition: transform 0.6s ease;
}
.about-image-wrap:hover {
  transform: rotateY(-5deg) rotateX(2deg) translateZ(20px);
}
.about-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.15);
}
.about-image-wrap .about-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 18, 32, 0.3), rgba(10, 18, 32, 0.6));
}

.about-floating-card {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 240px;
  padding: 22px;
  border-radius: var(--radius-md);
  transform: translateZ(50px);
  animation: float-3d 5s ease-in-out infinite;
}
.about-floating-card .fc-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.about-floating-card .fc-icon svg {
  width: 22px;
  height: 22px;
  color: #fff;
}
.about-floating-card .fc-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}
.about-floating-card .fc-desc {
  font-size: 13px;
  color: var(--text-secondary);
}

.about-content .about-text {
  font-size: 16px;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.about-cta {
  margin-top: 8px;
}

/* 业务板块 */
.business-section {
  background: var(--bg-deep);
  overflow: hidden;
}
.business-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse at top, rgba(61, 139, 255, 0.15), transparent 70%);
  pointer-events: none;
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  perspective: 1400px;
}

.business-card {
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  cursor: default;
}
.business-card .card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(61, 139, 255, 0.25), rgba(0, 212, 255, 0.12));
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: all 0.4s ease;
  transform: translateZ(30px);
}
.business-card:hover .card-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: translateZ(40px) scale(1.05);
}
.business-card:hover .card-icon svg {
  color: #fff;
}
.business-card .card-icon svg {
  width: 26px;
  height: 26px;
  color: var(--primary-light);
  transition: color 0.3s ease;
}

.business-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  transform: translateZ(25px);
}
.business-card .card-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex: 1;
  transform: translateZ(20px);
}

.business-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  transform: translateZ(15px);
}
.business-card .card-tag {
  padding: 5px 12px;
  background: rgba(61, 139, 255, 0.1);
  border: 1px solid var(--border-glass);
  border-radius: 100px;
  font-size: 12px;
  color: var(--text-secondary);
}

.business-card:nth-child(4) {
  background:
    linear-gradient(135deg, rgba(255, 138, 61, 0.08), rgba(61, 139, 255, 0.06)),
    var(--bg-card);
}
.business-card:nth-child(4) .card-icon {
  background: linear-gradient(135deg, rgba(255, 138, 61, 0.3), rgba(255, 138, 61, 0.1));
  border-color: rgba(255, 138, 61, 0.4);
}
.business-card:nth-child(4) .card-icon svg {
  color: var(--accent-warm);
}
.business-card:nth-child(4):hover .card-icon {
  background: linear-gradient(135deg, var(--accent-warm), #ff6b1a);
}
.business-card:nth-child(4):hover .card-icon svg {
  color: #fff;
}

.business-card .card-corner {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 40px;
  font-weight: 900;
  color: rgba(61, 139, 255, 0.08);
  line-height: 1;
  transform: translateZ(10px);
}
.business-card:nth-child(4) .card-corner {
  color: rgba(255, 138, 61, 0.1);
}

/* 企业优势 */
.advantages-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}
.advantages-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(61, 139, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 139, 255, 0.05) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.5;
  pointer-events: none;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  perspective: 1200px;
  position: relative;
  z-index: 1;
}

.advantage-item {
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  text-align: center;
  transform-style: preserve-3d;
  transition: all 0.5s ease;
}
.advantage-item:hover {
  transform: translateY(-10px) translateZ(20px);
  box-shadow: var(--shadow-3d), 0 0 50px rgba(61, 139, 255, 0.15);
}
.advantage-item .adv-num {
  font-size: 64px;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 8px;
  background: linear-gradient(180deg, var(--primary-light), transparent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transform: translateZ(30px);
  opacity: 0.7;
}
.advantage-item h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  transform: translateZ(25px);
}
.advantage-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  transform: translateZ(20px);
}

/* 服务流程 */
.process-section {
  background: var(--bg-deep);
  position: relative;
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  position: relative;
  perspective: 1200px;
}

.process-step {
  padding: 30px 20px;
  text-align: center;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s ease;
}
.process-step:hover {
  transform: translateY(-8px) translateZ(20px);
}

.process-step .step-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--bg-mid), var(--bg-dark));
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), var(--shadow-inner);
  transform: translateZ(30px);
}
.process-step .step-icon svg {
  width: 30px;
  height: 30px;
  color: var(--primary-light);
}
.process-step .step-icon::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}
.process-step:hover .step-icon::before {
  opacity: 1;
}
.process-step:hover .step-icon {
  border-color: transparent;
}
.process-step:hover .step-icon svg {
  color: #fff;
}

.process-step .step-num {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(61, 139, 255, 0.4);
}

.process-step h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  transform: translateZ(20px);
}
.process-step p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  transform: translateZ(15px);
}

.process-line {
  position: absolute;
  top: 66px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
  opacity: 0.3;
  z-index: 0;
}

/* 联系我们 */
.contact-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}
.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}
.contact-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse at bottom, rgba(61, 139, 255, 0.2), transparent 70%);
  pointer-events: none;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: start;
  position: relative;
  z-index: 1;
}

.contact-info-card {
  padding: 48px;
  border-radius: var(--radius-xl);
  transform-style: preserve-3d;
  perspective: 1000px;
}

.contact-info-card h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 30px;
  transform: translateZ(30px);
}

.contact-info-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  transform: translateZ(20px);
}

.contact-info-item {
  display: flex;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(61, 139, 255, 0.05);
  border: 1px solid var(--border-glass);
  transition: all 0.3s ease;
}
.contact-info-item:hover {
  background: rgba(61, 139, 255, 0.12);
  border-color: var(--border-strong);
  transform: translateX(4px);
}
.contact-info-item .cii-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(61, 139, 255, 0.25), rgba(0, 212, 255, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-info-item .cii-icon svg {
  width: 18px;
  height: 18px;
  color: var(--primary-light);
}
.contact-info-item .cii-text .cii-label {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}
.contact-info-item .cii-text .cii-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

.contact-info-item.full-width {
  grid-column: 1 / -1;
}

/* 联系右侧 3D 地图 */
.contact-visual {
  position: relative;
  height: 500px;
  perspective: 1200px;
}

.map-card {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  transform: rotateY(6deg) rotateX(-4deg);
  transform-style: preserve-3d;
  box-shadow: 30px 30px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--border-glass);
  transition: transform 0.6s ease;
}
.map-card:hover {
  transform: rotateY(3deg) rotateX(-2deg) translateZ(15px);
}
.map-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.2) contrast(1.1);
}
.map-card .map-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 32, 0.3) 0%, rgba(10, 18, 32, 0.7) 100%);
}
.map-card .map-pin {
  position: absolute;
  top: 45%;
  left: 35%;
  transform: translate(-50%, -100%) translateZ(40px);
}
.map-pin .pin-body {
  width: 30px;
  height: 42px;
  position: relative;
}
.map-pin .pin-head {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 30px var(--accent), 0 4px 12px rgba(0, 0, 0, 0.3);
}
.map-pin .pin-tail {
  width: 18px;
  height: 22px;
  background: var(--accent);
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  border-radius: 2px;
}
.map-pin .pin-pulse {
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  animation: pulse-ring 2s ease-out infinite;
}
.map-pin .pin-label {
  position: absolute;
  top: 48px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  background: rgba(10, 18, 32, 0.9);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-size: 12px;
  white-space: nowrap;
  color: var(--text-primary);
  font-weight: 600;
}

/* 页脚 */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border-glass);
  padding: 60px 40px 30px;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 50px;
  padding-bottom: 50px;
  border-bottom: 1px solid var(--border-glass);
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 18px;
}
.footer-brand .footer-logo .logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.footer-brand .footer-logo .logo-mark::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 8px;
  background: var(--bg-dark);
}
.footer-brand .footer-logo .logo-mark svg {
  position: relative;
  z-index: 1;
  width: 20px;
  height: 20px;
  color: var(--accent);
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-col ul a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}
.footer-col ul a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-bottom .copyright {
  font-size: 13px;
  color: var(--text-tertiary);
}
.footer-bottom .credit-code {
  font-size: 12px;
  color: var(--text-tertiary);
  font-family: 'Courier New', monospace;
}

/* 响应式 */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { height: 400px; order: -1; }
  .about-grid { grid-template-columns: 1fr; gap: 50px; }
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .process-timeline { grid-template-columns: repeat(3, 1fr); }
  .process-line { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-visual { height: 350px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .nav-bar { padding: 14px 20px; }
  .nav-bar.scrolled { padding: 10px 20px; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-mobile-btn { display: block; }

  .hero { padding: 100px 20px 60px; }
  .hero-visual { height: 320px; }
  .visual-orbit { width: 280px; height: 280px; }
  .visual-core { width: 140px; height: 140px; }
  .visual-core svg { width: 56px; height: 56px; }
  .orbit-ring.r1 { width: 200px; height: 200px; }
  .orbit-ring.r2 { width: 240px; height: 240px; }
  .orbit-ring.r3 { width: 280px; height: 280px; }

  .section { padding: 80px 20px; }
  .business-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .process-timeline { grid-template-columns: 1fr; gap: 20px; }

  .about-info-grid { grid-template-columns: 1fr; }
  .contact-info-list { grid-template-columns: 1fr; }
  .contact-info-card { padding: 30px 24px; }

  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat .stat-num { font-size: 26px; }

  .footer { padding: 40px 20px 20px; }
  .footer-top { grid-template-columns: 1fr; gap: 36px; padding-bottom: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .about-floating-card { right: 10px; bottom: 10px; width: 200px; padding: 16px; }
  .about-visual { height: 380px; }
}

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 75%;
  max-width: 320px;
  height: 100vh;
  background: rgba(10, 18, 32, 0.98);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  z-index: 200;
  border-left: 1px solid var(--border-glass);
  transition: right 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  padding: 80px 30px 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mobile-menu.open { right: 0; }
.mobile-menu a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-glass);
}

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background: var(--primary-deep);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: var(--primary); }