/* roulang page: index */
:root {
      --deep-bg: #0F0F1A;
      --card-bg: rgba(26,26,46,0.75);
      --primary-violet: #7C3AED;
      --electric-cyan: #00F0FF;
      --gold-accent: #FFD700;
      --text-primary: #FFFFFF;
      --text-body: #B0B0CC;
      --text-muted: #6B6B80;
      --border-subtle: rgba(255,255,255,0.08);
      --border-card: rgba(255,255,255,0.06);
      --shadow-card: 0 12px 32px rgba(0,0,0,0.5);
      --shadow-hover: 0 18px 40px rgba(124,58,237,0.3);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --glass-bg: rgba(15,15,26,0.55);
      --nav-blur: blur(20px);
      --transition: all 0.25s ease;
      --max-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--deep-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .nav-glass {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: var(--glass-bg);
      backdrop-filter: var(--nav-blur);
      -webkit-backdrop-filter: var(--nav-blur);
      border-bottom: 1px solid var(--border-subtle);
      box-shadow: 0 8px 24px rgba(0,0,0,0.25);
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 0.75rem 0;
    }
    .nav-glass.scrolled {
      background: #0F0F1A;
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    .logo {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #FFFFFF 0%, var(--electric-cyan) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: #E0E0F0;
      font-weight: 500;
      font-size: 1rem;
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
      border-bottom-color: var(--electric-cyan);
    }
    .nav-cta {
      background: rgba(124,58,237,0.2);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.25);
      color: white;
      padding: 0.5rem 1.4rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.3s;
    }
    .nav-cta:hover {
      background: rgba(124,58,237,0.5);
      border-color: var(--electric-cyan);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10,10,20,0.96);
      backdrop-filter: blur(30px);
      padding: 2rem 1.5rem;
      gap: 1.5rem;
      border-bottom: 1px solid var(--border-subtle);
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 20px 30px rgba(0,0,0,0.7);
    }
    .mobile-menu a {
      color: #E0E0F0;
      font-size: 1.2rem;
      font-weight: 500;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav-cta.desktop { display: none; }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 6rem 1.5rem 4rem;
      text-align: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(15,15,26,0.85) 0%, rgba(124,58,237,0.4) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
    }
    .hero h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 7vw, 4.8rem);
      color: white;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: #D0D0E8;
      margin-bottom: 2.5rem;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-violet);
      color: white;
      font-weight: 700;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      box-shadow: 0 0 20px rgba(124,58,237,0.5);
      transition: 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #8b5cf6;
      box-shadow: 0 0 28px rgba(124,58,237,0.8);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 700;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      color: white;
    }
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-weight: 700;
      font-size: 2.4rem;
      color: white;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
      letter-spacing: -0.5px;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--electric-cyan), transparent);
      margin-top: 0.6rem;
      border-radius: 4px;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
      margin-top: 2.5rem;
    }
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      border-color: var(--electric-cyan);
      box-shadow: var(--shadow-hover);
    }
    .icon-placeholder {
      font-size: 2.4rem;
      margin-bottom: 1.5rem;
      color: var(--electric-cyan);
    }
    .highlight-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--gold-accent);
      line-height: 1.2;
    }
    .testimonial-card {
      background: rgba(26,26,46,0.8);
      border-left: 4px solid var(--primary-violet);
    }
    .faq-accordion .accordion-title {
      background: #1A1A2E;
      color: #E0E0F0;
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      padding: 1rem 1.5rem;
      font-weight: 600;
    }
    .faq-accordion .accordion-title:hover {
      color: var(--electric-cyan);
    }
    .cta-block {
      background: #0A0A14;
      position: relative;
      overflow: hidden;
    }
    .cta-block::before {
      content: '';
      position: absolute;
      top: -40%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(124,58,237,0.35) 0%, transparent 70%);
      border-radius: 50%;
    }
    footer {
      background: #050510;
      color: var(--text-muted);
      padding: 2.5rem 0;
    }
    @media (max-width: 640px) {
      .section-title { font-size: 1.9rem; }
    }