/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #060B1A;
      --accent-red: #FF4655;
      --accent-cyan: #00E5FF;
      --bg-light: #F5F6FA;
      --bg-white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-muted: #5B5B7A;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0, 229, 255, 0.25);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 32px rgba(10,14,39,0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-tag: 4px;
      --font-bold: 700;
      --font-black: 900;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航栏 */
    .xi-nav {
      background: var(--primary-deep);
      border-bottom: 1px solid rgba(0, 229, 255, 0.35);
      position: sticky;
      top: 0;
      z-index: 99;
      padding: 0.85rem 0;
    }
    .xi-nav .grid-x {
      align-items: center;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: var(--font-black);
      letter-spacing: -0.5px;
      color: white;
      white-space: nowrap;
    }
    .logo-text .accent {
      color: var(--accent-red);
    }
    .xi-nav .menu li a {
      color: rgba(255,255,255,0.85);
      font-weight: 600;
      padding: 0.5rem 1rem;
      transition: var(--transition);
      font-size: 1rem;
      text-decoration: none;
    }
    .xi-nav .menu li a:hover,
    .xi-nav .menu li a.active {
      color: var(--accent-cyan);
      border-bottom: 2px solid var(--accent-cyan);
    }
    .menu-icon-dark::after {
      background: white;
      box-shadow: 0 7px 0 white, 0 14px 0 white;
    }
    /* Hero */
    #hero {
      background-color: var(--primary-dark);
      background-image: radial-gradient(circle at 20% 30%, rgba(0,229,255,0.08) 0%, transparent 40%),
                        linear-gradient(rgba(10,14,39,0.7) 0%, rgba(6,11,26,0.9) 100%);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }
    .hero-grid-bg {
      position: absolute;
      inset: 0;
      background-image: 
        linear-gradient(rgba(0,229,255,0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,229,255,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 3;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: var(--font-black);
      color: white;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--accent-cyan);
      margin: 1.2rem 0 2rem;
      opacity: 0.9;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 700;
      border: none;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 4px 12px rgba(255,70,85,0.4);
    }
    .btn-primary:hover {
      background: #E63040;
      box-shadow: 0 0 18px rgba(255,70,85,0.7);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 700;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      margin-left: 15px;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      color: white;
    }
    .hero-image-placeholder {
      background: rgba(0,229,255,0.05);
      border: 1px solid rgba(0,229,255,0.3);
      border-radius: 12px;
      min-height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 0.9rem;
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: var(--font-black);
      color: var(--primary-deep);
      margin-bottom: 0.75rem;
      letter-spacing: -0.5px;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,229,255,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }
    .scenario-img {
      background: #eef2f6;
      border-radius: 12px;
      border: 1px solid var(--border-light);
      min-height: 240px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
    }
    .data-block {
      background: var(--primary-deep);
      border-radius: var(--radius-card);
      padding: 2.5rem 1.5rem;
    }
    .big-number {
      font-size: 3.2rem;
      font-weight: var(--font-black);
      color: var(--accent-cyan);
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .pricing-card.featured {
      border-top: 4px solid var(--accent-red);
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .accordion-title {
      font-weight: 700;
      font-size: 1.1rem;
      border-left: 4px solid var(--accent-cyan);
      padding-left: 16px;
      background: transparent;
    }
    .cta-banner {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      border-radius: 12px;
      padding: 3.5rem 2rem;
      text-align: center;
      border: 1px solid rgba(0,229,255,0.25);
    }
    footer {
      background: #060B1A;
      color: #9B9BB0;
      padding: 3rem 0 1.5rem;
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 2rem; }
      .btn-outline { margin-left: 0; margin-top: 12px; }
      section { padding: 60px 0; }
      .section-title { font-size: 1.9rem; }
    }