/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-deep: #5A1EB8;
      --neon: #00F0FF;
      --neon-glow: rgba(0,240,255,0.3);
      --bg-deep: #0A0E17;
      --bg-card: rgba(255,255,255,0.04);
      --bg-glass: rgba(255,255,255,0.03);
      --border-light: rgba(255,255,255,0.12);
      --text-primary: #F0F3FA;
      --text-secondary: #B0B8C9;
      --text-muted: #6B7280;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-xl: 28px;
      --shadow-card: 0 12px 24px -8px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 24px var(--neon-glow);
      --max-width: 1280px;
      --padding-x: 32px;
      --section-gap: 100px;
      transition: color 0.2s, background 0.2s, transform 0.25s, box-shadow 0.25s;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    button, input, textarea {
      font: inherit;
      color: inherit;
    }

    /* ------------------- container & reuse ------------------- */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--padding-x);
    }

    .section {
      padding: var(--section-gap) 0;
    }

    .glass-card {
      background: var(--bg-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .hover-lift {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s;
    }

    .hover-lift:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 32px -8px rgba(0,240,255,0.15);
      border-color: rgba(0,240,255,0.5);
    }

    .neon-text {
      color: var(--neon);
      text-shadow: 0 0 12px var(--neon-glow);
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #8A4FFF, var(--primary));
      border: none;
      padding: 14px 36px;
      border-radius: 40px;
      color: white;
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 1px;
      box-shadow: 0 0 28px var(--neon-glow), 0 8px 22px rgba(0,0,0,0.4);
      cursor: pointer;
      transition: all 0.3s;
      width: fit-content;
    }

    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0,240,255,0.7), 0 12px 28px rgba(0,0,0,0.6);
      transform: translateY(-3px);
      background: linear-gradient(135deg, #A16FFF, #8A2FF7);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--neon);
      color: var(--neon);
      padding: 12px 34px;
      border-radius: 40px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      backdrop-filter: blur(8px);
      box-shadow: 0 0 16px rgba(0,240,255,0.2);
      cursor: pointer;
    }

    .btn-ghost:hover {
      background: var(--neon);
      color: #0A0E17;
      box-shadow: 0 0 32px var(--neon-glow);
      transform: translateY(-2px);
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 14px;
      letter-spacing: -0.3px;
      line-height: 1.3;
    }

    .section-label {
      display: inline-block;
      background: rgba(123,47,247,0.3);
      color: #ccbbff;
      padding: 4px 15px;
      border-radius: 30px;
      font-size: 0.9rem;
      border: 1px solid rgba(123,47,247,0.5);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    /* ---------------- Navbar ---------------- */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(123,47,247,0.2);
      z-index: 999;
      height: 76px;
      display: flex;
      align-items: center;
      padding: 0 28px;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.9rem;
      font-weight: 800;
      color: #F0F3FA;
      letter-spacing: 0.5px;
    }

    .brand-icon {
      font-size: 2.2rem;
      color: var(--neon);
      filter: drop-shadow(0 0 10px var(--neon-glow));
    }

    .nav-links {
      display: flex;
      gap: 28px;
      margin-left: auto;
      align-items: center;
    }

    .nav-links a {
      font-weight: 600;
      font-size: 1rem;
      color: #cbd5e1;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--neon);
      text-shadow: 0 0 10px var(--neon-glow);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--neon);
      cursor: pointer;
      margin-left: auto;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: #0f1525fb;
      backdrop-filter: blur(24px);
      flex-direction: column;
      padding: 100px 30px;
      gap: 26px;
      transition: right 0.3s ease;
      z-index: 999;
    }

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

    /* ---------- Hero ---------- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(125deg, #0b0f1a 0%, #0c1120 40%, rgba(10,14,23,0.95) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding-top: 76px;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      max-width: 750px;
    }

    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero .highlight {
      background: linear-gradient(to right, #00F0FF, #cb6ceb);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 25px;
    }

    .scroll-indicator {
      position: absolute;
      right: 30px;
      bottom: 30px;
      color: var(--neon);
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }

    @keyframes bounce{ 0%,100%{transform:translateY(0);} 50%{transform:translateY(8px);} }

    /* -------------- Features 斜向排版 ------------- */
    .feature-grid {
      display: flex;
      gap: 60px;
      flex-wrap: wrap;
      align-items: center;
    }

    .feature-visual {
      flex: 1 1 360px;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 0 35px rgba(123,47,247,0.3);
    }

    .feature-list {
      flex: 1 1 400px;
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .feat-item {
      display: flex;
      gap: 18px;
      align-items: flex-start;
      border-bottom: 1px solid rgba(123,47,247,0.2);
      padding-bottom: 18px;
    }

    .feat-icon {
      color: var(--neon);
      font-size: 2rem;
    }

    /* stats */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }

    .stat-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      padding: 28px 20px;
      border: 1px solid rgba(123,47,247,0.25);
      text-align: center;
    }

    .stat-number {
      font-size: 2.9rem;
      font-weight: 800;
      background: linear-gradient(to bottom, #00F0FF, #6B3FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* cases 横滚 */
    .case-scroll {
      display: flex;
      gap: 22px;
      overflow-x: auto;
      padding: 20px 0 30px;
      scrollbar-width: thin;
      scrollbar-color: #00F0FF #0A0E17;
    }
    .case-card {
      min-width: 300px;
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.06);
      transition: 0.2s;
    }
    .case-card:hover { border-color: #00F0FF; transform: scale(1.02); }
    .case-img { width:100%; height:200px; object-fit:cover; }

    /* solutions */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 35px;
    }
    .solution-item {
      padding: 32px;
    }

    /* faq */
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-left: 5px solid var(--neon);
      margin-bottom: 16px;
      border-radius: 0 18px 18px 0;
      padding: 22px 28px;
    }

    /* contact CTA */
    .cta-section {
      background: radial-gradient(circle at 20% 20%, #7c3aed3a, #0b0f1a);
      border-radius: 38px;
    }

    footer {
      background: #05070c;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns:1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.7rem; }
      .feature-grid { flex-direction: column; }
      .case-card { min-width: 80vw; }
    }
    @media (max-width: 480px) {
      .hero-actions { flex-direction: column; width:100%; }
      .btn-primary,.btn-ghost { width:100%; justify-content:center; }
    }