/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #0D1129;
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF3366;
      --bg-light: #F8FAFC;
      --text-light: #FFFFFF;
      --text-muted: #B0B8D0;
      --text-dark: #1E293B;
      --text-soft: #64748B;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --card-shadow: 0 8px 32px rgba(0, 240, 255, 0.08);
      --button-glow: 0 0 24px rgba(0, 240, 255, 0.6);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-title);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .header.scrolled {
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(24px);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 24px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-light);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-cyan);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0A0E27;
      font-weight: 700;
      font-size: 16px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      border-radius: 2px;
      transition: width var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--text-light);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-contact {
      background: linear-gradient(135deg, var(--accent-cyan), #00C8FF);
      color: #0A0E27;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-contact:hover {
      box-shadow: var(--button-glow);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-light);
      transition: var(--transition);
      border-radius: 2px;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: rgba(10, 14, 39, 0.98);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      transition: right 0.4s ease;
      z-index: 1000;
    }

    .mobile-menu.active {
      right: 0;
    }

    .mobile-menu a {
      color: var(--text-light);
      font-size: 1.4rem;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
    }

    .hero-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--text-light);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .hero .highlight {
      color: var(--accent-cyan);
    }

    .hero p {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #00C8FF);
      color: #0A0E27;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      display: inline-block;
      transition: all var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(0,240,255,0.3);
    }

    .btn-primary:hover {
      box-shadow: var(--button-glow);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 12px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      margin-left: 16px;
      transition: all var(--transition);
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,240,255,0.15);
      border: 1px solid var(--glass-border);
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .section-sub {
      color: var(--text-soft);
      margin-bottom: 40px;
      font-size: 1rem;
    }

    .bg-dark {
      background: var(--primary-dark);
      color: var(--text-light);
    }

    .bg-dark .section-title {
      color: var(--text-light);
    }

    /* 核心优势非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }

    .adv-main {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all var(--transition);
    }

    .adv-main:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--card-shadow);
    }

    .adv-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .adv-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 24px;
      transition: all var(--transition);
    }

    .adv-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--card-shadow);
    }

    .icon-cyan {
      color: var(--accent-cyan);
      font-size: 28px;
      margin-bottom: 12px;
    }

    /* 服务交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img img {
      border-radius: var(--radius-lg);
      border: 1px solid var(--glass-border);
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 300px;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 8px 20px rgba(0,0,0,0.04);
      scroll-snap-align: start;
    }

    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-soft);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 底部CTA */
    .cta-section {
      background: var(--primary-deep);
      position: relative;
      overflow: hidden;
      text-align: center;
      padding: 80px 0;
    }

    .footer {
      background: #0A0E27;
      color: #B0B8D0;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero h1 { font-size: 36px; }
      .advantages-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 640px) {
      .nav-links, .btn-contact { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }