/* roulang page: index */
:root {
      --primary: #6C3CFC;
      --primary-dark: #1E0A4B;
      --accent-cyan: #00F0FF;
      --accent-gold: #FFB800;
      --bg-deep: #0D0721;
      --bg-black: #000000;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-muted: rgba(255,255,255,0.4);
      --radius-xs: 8px;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --radius-pill: 50px;
      --shadow-glow: 0 0 20px rgba(0,240,255,0.6);
      --shadow-card: inset 0 0 0 1px rgba(255,255,255,0.05);
      --font-sans: 'Inter', 'PingFang SC', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --max-width: 1280px;
      --header-height: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background: var(--bg-black);
    }
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, var(--primary-dark) 0%, #0D0721 50%, #000000 100%);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 网格纹理背景 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(rgba(108,60,252,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(108,60,252,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      display: flex;
      align-items: center;
      transition: background 0.4s, backdrop-filter 0.4s, box-shadow 0.4s;
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }
    .header.scrolled {
      background: rgba(13,7,33,0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      background: linear-gradient(135deg, #00F0FF 0%, #6C3CFC 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      text-decoration: none;
      position: relative;
      z-index: 10;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
    }
    .nav-link:hover {
      color: var(--accent-cyan);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all 0.25s;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      font-size: 15px;
    }
    .btn-ghost:hover {
      background: var(--accent-gold);
      color: #000;
      box-shadow: 0 0 18px rgba(255,184,0,0.8);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 20;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: 0.3s;
      border-radius: 2px;
    }
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(13,7,33,0.96);
      backdrop-filter: blur(25px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 15;
    }
    .mobile-panel.active {
      transform: translateY(0);
    }
    .mobile-panel .nav-link {
      font-size: 22px;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }
    .section-title {
      font-size: 40px;
      font-weight: 800;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
      background: linear-gradient(to right, #fff, #ccc);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 600px;
      margin-bottom: 48px;
    }
    /* 卡片玻璃 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: var(--accent-cyan);
      background: rgba(255,255,255,0.06);
      transform: translateY(-6px);
      box-shadow: 0 8px 30px rgba(0,240,255,0.15);
    }
    /* 按钮主 */
    .btn-primary {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.25s;
      text-decoration: none;
      display: inline-block;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: var(--accent-cyan);
      color: #000;
      box-shadow: var(--shadow-glow);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: var(--header-height);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0); }
    }
    .hero h1 {
      font-size: clamp(36px, 6vw, 64px);
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(180deg, #fff 0%, #00F0FF 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-secondary {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-secondary:hover {
      border-color: var(--accent-gold);
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .hero-right { display: none; }
      .hero-left { text-align: center; }
      .hero p { margin: 0 auto 32px; }
      .btn-group { justify-content: center; }
    }
    /* 优势卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      padding: 32px;
      text-align: center;
    }
    .adv-icon {
      font-size: 40px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    /* 服务2x2 */
    .grid-2x2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .service-card {
      padding: 32px;
      display: flex;
      flex-direction: column;
    }
    .service-icon {
      font-size: 48px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }
    /* 场景卡片 */
    .scenario-row {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scroll-snap-type: x mandatory;
    }
    .scene-card {
      min-width: 280px;
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      position: relative;
      height: 240px;
      background-size: cover;
      background-position: center;
      scroll-snap-align: start;
    }
    .scene-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
    }
    /* 案例混合 */
    .case-mix {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .stat-block {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .stat-item {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 900;
      color: var(--accent-gold);
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      background: rgba(255,255,255,0.02);
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA */
    .cta-dark {
      background: #0D0721;
      text-align: center;
      padding: 80px 24px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .grid-3, .grid-2x2 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .process-steps { flex-direction: column; gap: 32px; }
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: rgba(255,255,255,0.5);
      transition: 0.2s;
    }
    .social-icons i:hover { color: var(--accent-cyan); }