/* roulang page: index */
:root {
      --primary-cyan: #00F0FF;
      --accent-magenta: #FF006E;
      --bg-dark: #0B0A1A;
      --bg-mid: #100E24;
      --glass-bg: rgba(26, 24, 50, 0.75);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-primary: #E0E0F0;
      --text-secondary: #9B97C0;
      --text-white: #FFFFFF;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 16px 48px rgba(0, 240, 255, 0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-sans);
      background: linear-gradient(135deg, #0B0A1A 0%, #100E24 100%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    #home {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
      -webkit-backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }

    #home.scrolled {
      background: rgba(14, 11, 28, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }

    .logo i {
      color: var(--primary-cyan);
      font-size: 28px;
      filter: drop-shadow(0 0 8px rgba(0,240,255,0.6));
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }

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

    .btn-primary-sm {
      background: var(--primary-cyan);
      color: #0B0A1A;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      font-size: 14px;
      letter-spacing: 0.3px;
      box-shadow: 0 0 16px rgba(0,240,255,0.4);
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary-sm:hover {
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: scale(1.04);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: white;
      background: none;
      border: none;
      cursor: pointer;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: rgba(10, 9, 20, 0.96);
      backdrop-filter: blur(30px);
      flex-direction: column;
      padding: 80px 30px;
      gap: 30px;
      transition: right 0.3s ease;
      z-index: 1001;
      display: flex;
      border-left: 1px solid rgba(0,240,255,0.15);
    }

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

    .mobile-menu a {
      color: var(--text-primary);
      font-size: 20px;
      font-weight: 600;
      text-decoration: none;
    }

    .mobile-menu .btn-primary-sm {
      width: fit-content;
      margin-top: 20px;
    }

    /* Hero */
    #hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 50%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 48px;
      line-height: 1.25;
      font-weight: 800;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-left .sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 44px;
    }

    .btn-primary {
      background: var(--primary-cyan);
      color: #0B0A1A;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
      transition: 0.25s;
      display: inline-block;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,240,255,0.8);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      font-size: 16px;
      transition: 0.25s;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 16px rgba(0,240,255,0.4);
    }

    .stats-row {
      display: flex;
      gap: 32px;
    }

    .stat-item .num {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-cyan);
    }

    .stat-item .label {
      font-size: 13px;
      color: var(--text-secondary);
    }

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

    .glass-card-visual {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      width: 100%;
      aspect-ratio: 4 / 3;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 30px rgba(0,240,255,0.2);
      animation: float 6s ease-in-out infinite;
      overflow: hidden;
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-16px); }
      100% { transform: translateY(0px); }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px;
      font-size: 18px;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }

    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: all 0.3s;
    }

    .highlight-card:hover {
      border-color: var(--primary-cyan);
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
    }

    .large-card {
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 320px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      color: white;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: 0.3s;
      text-align: left;
    }

    .service-card:hover {
      transform: translateY(-8px);
      border-color: var(--primary-cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.25);
    }

    .service-icon {
      font-size: 36px;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }

    .tag {
      background: rgba(0,240,255,0.1);
      color: var(--primary-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      display: inline-block;
      margin-right: 6px;
      margin-top: 12px;
    }

    /* 案例 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      margin-bottom: 24px;
      overflow: hidden;
      transition: 0.2s;
    }

    .case-card:hover {
      border-color: var(--primary-cyan);
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #1a1832;
    }

    .case-content {
      padding: 20px;
    }

    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }

    .compare-col {
      background: var(--glass-bg);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      border: 1px solid var(--glass-border);
      text-align: center;
    }

    .compare-col.featured {
      border: 2px solid var(--accent-magenta);
      box-shadow: 0 0 32px rgba(255,0,110,0.25);
      position: relative;
    }

    .badge {
      background: var(--accent-magenta);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 16px;
    }

    .price {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-cyan);
    }

    /* FAQ 双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: var(--glass-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--glass-border);
      padding: 0;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(0,0,0,0.2);
      border-left: 3px solid var(--primary-cyan);
      padding: 0 24px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* 数据区 */
    .trust-stats {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    .trust-num {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-cyan);
    }

    /* 最终CTA */
    #cta {
      background: #0B0A1A;
      position: relative;
      overflow: hidden;
    }

    .particle {
      position: absolute;
      background: var(--primary-cyan);
      border-radius: 50%;
      opacity: 0.2;
      animation: breathe 4s infinite;
    }

    @keyframes breathe {
      0% { transform: scale(0.8); opacity: 0.1; }
      50% { transform: scale(1.4); opacity: 0.3; }
      100% { transform: scale(0.8); opacity: 0.1; }
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      color: var(--text-secondary);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .highlights-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; overflow-x: auto; }
      .faq-grid { grid-template-columns: 1fr; }
      .trust-stats { flex-wrap: wrap; gap: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-left h1 { font-size: 36px; }
    }