/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --cyan: #00F0FF;
      --orange: #FF6B35;
      --bg-dark: #060918;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(0, 240, 255, 0.15);
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #7B8FA1;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-cyan: 0 0 20px rgba(0,240,255,0.3);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    h1, h2, h3 {
      color: var(--text-white);
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(6, 9, 24, 0.85);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0,240,255,0.1);
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 0.02em;
    }
    .logo i {
      color: var(--cyan);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 8px var(--cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-capsule {
      background: var(--cyan);
      color: var(--deep-blue);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.04em;
      transition: box-shadow 0.3s;
    }
    .btn-capsule:hover {
      box-shadow: 0 0 24px var(--cyan);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      background: transparent;
      border: none;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: rgba(10,14,39,0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,240,255,0.15);
      justify-content: space-around;
      align-items: center;
      z-index: 999;
      padding-bottom: env(safe-area-inset-bottom);
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      gap: 4px;
    }
    .mobile-bottom-nav a i {
      font-size: 20px;
    }
    .mobile-bottom-nav a.active {
      color: var(--cyan);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 25% 20%, rgba(0,240,255,0.08) 0%, transparent 50%),
                  radial-gradient(circle at 75% 70%, rgba(255,107,53,0.1) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 48px;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      letter-spacing: 0.04em;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: var(--deep-blue);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.06em;
      transition: box-shadow 0.3s;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px var(--cyan);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }
    .hero-visual {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .particle-canvas {
      width: 100%;
      height: 400px;
      background: radial-gradient(circle, rgba(0,240,255,0.05) 0%, transparent 70%);
      border-radius: 24px;
    }
    .floating-card {
      position: absolute;
      bottom: 20px;
      right: 10px;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 16px;
      padding: 16px 24px;
      color: white;
      font-family: var(--font-number);
    }
    /* 板块通用 */
    section {
      padding: 120px 0;
      position: relative;
    }
    .section-title {
      font-size: 40px;
      font-weight: 600;
      letter-spacing: 0.03em;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 64px;
    }
    .grid-2col {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 0 25px rgba(0,240,255,0.25);
      border-color: rgba(0,240,255,0.4);
    }
    .icon-cyan {
      font-size: 48px;
      color: var(--cyan);
      margin-bottom: 24px;
    }
    .card-title {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--card-border);
      transition: all 0.3s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 0 30px rgba(0,240,255,0.3);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-body {
      padding: 24px;
    }
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 32px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--orange);
    }
    /* 品牌墙 */
    .brand-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 32px;
      align-items: center;
    }
    .brand-item img {
      opacity: 0.5;
      transition: opacity 0.3s;
    }
    .brand-item:hover img {
      opacity: 1;
    }
    /* 时间轴 */
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 30px;
      left: 0;
      width: 100%;
      height: 2px;
      background: rgba(0,240,255,0.2);
    }
    .timeline-step {
      text-align: center;
      z-index: 2;
    }
    .step-circle {
      width: 24px;
      height: 24px;
      background: var(--cyan);
      border-radius: 50%;
      margin: 18px auto;
      box-shadow: 0 0 15px var(--cyan);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 8px;
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: white;
      cursor: pointer;
      background: rgba(255,255,255,0.02);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* 底部CTA */
    .cta-section {
      background: var(--deep-blue);
      text-align: center;
    }
    .pulse-btn {
      animation: pulse 2s infinite;
      background: var(--cyan);
      color: #0A0E27;
      padding: 16px 48px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 18px;
      margin-top: 32px;
      display: inline-block;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(0,240,255,0.5); }
      70% { box-shadow: 0 0 0 18px rgba(0,240,255,0); }
      100% { box-shadow: 0 0 0 0 rgba(0,240,255,0); }
    }
    footer {
      background: #040816;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 48px;
    }
    @media (max-width: 1024px) {
      .grid-3col, .stats-grid { grid-template-columns: repeat(2,1fr); }
      .brand-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .navbar .btn-capsule { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero h1 { font-size: 40px; }
      .grid-2col, .grid-3col, .stats-grid { grid-template-columns: 1fr; }
      .brand-grid { grid-template-columns: repeat(2,1fr); }
      .timeline { flex-direction: column; gap: 32px; }
      .footer-grid { grid-template-columns: 1fr; }
    }