/* roulang page: index */
:root {
      --primary: #5B3FE8;
      --primary-glow: #7B5FF8;
      --accent: #00E5A0;
      --danger: #FF6B3D;
      --bg-deep: #0F0F1A;
      --bg-section: #151525;
      --bg-card: #1E1E32;
      --text-white: #FFFFFF;
      --text-light: #B0B0C0;
      --text-muted: #70708A;
      --border-dim: rgba(255,255,255,0.06);
      --border-hover: rgba(255,255,255,0.15);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 32px rgba(91,63,232,0.25);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Roboto", sans-serif;
      --font-mono: "SF Mono", "Cascadia Code", "Roboto Mono", monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-md);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15, 15, 26, 0.8);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background: rgba(10, 10, 20, 0.9);
      box-shadow: 0 8px 24px rgba(0,0,0,0.6);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #5B3FE8, #00E5A0);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
    }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-light);
      padding: 6px 0;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active {
      color: var(--accent);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-white);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 10, 20, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      padding: 32px 0;
      gap: 28px;
      z-index: 999;
    }
    .mobile-menu.open {
      display: flex;
    }
    .mobile-link {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-white);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      margin-top: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(15,15,26,0.7) 0%, rgba(15,15,26,0.9) 90%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      padding: 120px 24px 80px;
    }
    .hero h1 {
      font-size: clamp(36px, 8vw, 60px);
      font-weight: 700;
      color: var(--text-white);
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 0 30px rgba(91,63,232,0.6);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-light);
      margin-bottom: 40px;
    }
    .mock-score {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 24px;
      margin: 30px 0 40px;
      background: rgba(30,30,50,0.7);
      backdrop-filter: blur(12px);
      padding: 16px 32px;
      border-radius: 60px;
      border: 1px solid var(--border-dim);
    }
    .team {
      font-weight: 700;
      font-size: 1.25rem;
      color: white;
    }
    .score-digit {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 2px;
    }
    .vs {
      color: var(--text-muted);
      font-weight: 600;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all 0.25s;
      box-shadow: 0 4px 14px rgba(91,63,232,0.4);
    }
    .btn-primary:hover {
      background: var(--primary-glow);
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(91,63,232,0.1);
    }
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      border: 1px solid var(--border-dim);
      transition: all 0.3s;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
      border-color: var(--primary);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, #5B3FE8, #7B5FF8);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
    }
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      background: #1E1E32;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .service-text {
      flex: 1;
    }
    .tag {
      display: inline-block;
      background: rgba(0,229,160,0.15);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-right: 8px;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-dim);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-light);
      line-height: 2;
    }
    .faq-answer.open {
      max-height: 200px;
    }
    .cta-section {
      background: linear-gradient(135deg, #5B3FE8, #2D1B8E);
      text-align: center;
      padding: 80px 24px;
    }
    footer {
      background: #0A0A14;
      border-top: 2px solid var(--primary);
      padding: 48px 0 24px;
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .stats-grid { gap: 24px; }
    }