/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --card-bg-start: #111633;
      --card-bg-end: #1A1F3A;
      --electric-purple: #7C3AED;
      --electric-purple-glow: rgba(124,58,237,0.6);
      --warm-gold: #F0B90B;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(124,58,237,0.2);
      --text-primary: #F1F5F9;
      --text-secondary: #CBD5E1;
      --text-muted: #94A3B8;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-purple: 0 8px 32px rgba(124,58,237,0.25);
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background: linear-gradient(135deg, var(--deep-space) 0%, #1A1F3A 100%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    button, .btn { cursor: pointer; border: none; background: none; font-family: inherit; }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(124,58,237,0.25);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      background: linear-gradient(135deg, #fff 0%, #e0e7ff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 12px rgba(124,58,237,0.5);
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
      letter-spacing: 0.4px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-purple);
      box-shadow: 0 0 10px var(--electric-purple-glow);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: #fff;
    }
    .nav-menu a:hover::after, .nav-menu a.active::after {
      width: 100%;
    }
    .cta-nav {
      background: var(--electric-purple);
      color: var(--warm-gold);
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.6px;
      box-shadow: 0 0 14px var(--electric-purple-glow);
      transition: all 0.25s;
      border: 1px solid rgba(255,255,255,0.1);
      white-space: nowrap;
    }
    .cta-nav:hover {
      background: #8b5cf6;
      box-shadow: 0 0 22px var(--electric-purple-glow);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #fff;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0.4rem;
      border-radius: 6px;
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem 1.5rem;
        gap: 1.8rem;
        border-bottom: 1px solid rgba(124,58,237,0.4);
        box-shadow: 0 12px 30px rgba(0,0,0,0.5);
      }
      .nav-menu.active { display: flex; }
      .cta-nav { padding: 0.6rem 1.4rem; font-size: 0.85rem; }
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(124,58,237,0.18) 0%, transparent 55%);
      padding-top: 72px;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      padding: 2rem 1.5rem;
      z-index: 2;
      animation: fadeUp 0.9s ease;
    }
    .hero-content h1 {
      font-size: clamp(2.4rem, 6vw, 4.2rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      background: linear-gradient(to right, #ffffff, #e9d5ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: #cbd5e1;
      margin-bottom: 2.2rem;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--electric-purple);
      color: var(--warm-gold);
      font-weight: 700;
      padding: 0.9rem 2.8rem;
      border-radius: 40px;
      font-size: 1.1rem;
      box-shadow: 0 0 20px var(--electric-purple-glow);
      transition: all 0.3s;
      display: inline-block;
      letter-spacing: 0.8px;
      border: 1px solid rgba(255,255,255,0.2);
      animation: pulseGlow 2.2s infinite;
    }
    .btn-primary:hover {
      background: #8b5cf6;
      box-shadow: 0 0 30px #a78bfa;
      transform: translateY(-2px);
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 20px var(--electric-purple-glow); }
      70% { box-shadow: 0 0 38px #a78bfa; }
      100% { box-shadow: 0 0 20px var(--electric-purple-glow); }
    }
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(28px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    section { padding: 5rem 1.5rem; position: relative; }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.9rem;
      color: #fff;
    }
    .section-sub {
      text-align: center;
      color: #a5b4fc;
      max-width: 680px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(124,58,237,0.2);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: all 0.3s;
      box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    }
    .glass-card:hover {
      border-color: rgba(124,58,237,0.5);
      box-shadow: 0 14px 34px rgba(124,58,237,0.25);
      transform: translateY(-4px);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }
    @media (max-width: 640px) {
      .grid-3 { grid-template-columns: 1fr; }
      section { padding: 3.5rem 1rem; }
    }

    /* 优势数据 */
    .stat-panel {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 2rem;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(8px);
      border-radius: 28px;
      padding: 2.8rem 2rem;
      margin-top: 1rem;
      border: 1px solid rgba(124,58,237,0.15);
    }
    .stat-item {
      text-align: center;
      min-width: 160px;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--warm-gold);
      text-shadow: 0 0 14px rgba(240,185,11,0.5);
    }
    .stat-label {
      color: #cbd5e1;
      font-size: 1rem;
      margin-top: 0.25rem;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    .case-card {
      background-size: cover;
      background-position: center;
      border-radius: 22px;
      min-height: 280px;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: flex-end;
    }
    .case-overlay {
      background: linear-gradient(0deg, rgba(10,14,39,0.92) 0%, rgba(10,14,39,0.4) 100%);
      width: 100%;
      padding: 2rem 1.5rem;
      color: #fff;
      border-top: 1px solid rgba(124,58,237,0.4);
    }

    /* 流程 */
    .flow-steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 2.5rem;
      margin-top: 2rem;
    }
    .step {
      text-align: center;
      max-width: 180px;
    }
    .step-icon {
      width: 64px;
      height: 64px;
      border: 2px solid var(--electric-purple);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-size: 1.8rem;
      color: #ddd6fe;
      transition: 0.2s;
    }
    .step:hover .step-icon {
      background: var(--electric-purple);
      color: #fff;
      box-shadow: 0 0 20px var(--electric-purple-glow);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(124,58,237,0.2);
      padding: 1.3rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 0.8rem;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #cbd5e1;
      margin-top: 0.7rem;
      padding-left: 2.2rem;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    #contact {
      background: linear-gradient(145deg, #0b0f2b 0%, #12183a 100%);
      text-align: center;
      border-top: 1px solid rgba(124,58,237,0.25);
    }

    footer {
      text-align: center;
      padding: 2.5rem 1.5rem;
      font-size: 0.9rem;
      color: #94a3b8;
      border-top: 1px solid rgba(124,58,237,0.15);
    }