/* roulang page: index */
:root {
      --deep-blue: #0A1F3F;
      --tech-cyan: #00B4D8;
      --vivid-orange: #FF6B35;
      --bg-light: #F4F6F9;
      --bg-dark: #060E1A;
      --card-glass-bg: rgba(255,255,255,0.08);
      --card-glass-border: rgba(255,255,255,0.15);
      --text-primary: #1e2c3a;
      --text-secondary: #4a5b6b;
      --text-on-dark: #e6edf5;
      --shadow-sm: 0 8px 20px rgba(0,0,0,0.08);
      --shadow-glow: 0 8px 32px rgba(0,0,0,0.25);
      --radius-md: 16px;
      --radius-pill: 30px;
      --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.5;
      font-weight: 400;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: 0.5px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: var(--transition-smooth);
      padding: 16px 0;
    }

    .nav-bar.scrolled {
      background: rgba(10, 31, 63, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      padding: 10px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--vivid-orange);
      filter: drop-shadow(0 0 6px rgba(255,107,53,0.5));
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 900;
      font-size: 24px;
      color: #fff;
      letter-spacing: 2px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--tech-cyan);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--tech-cyan);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-cta-nav {
      background: var(--vivid-orange);
      color: #fff !important;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(255,107,53,0.5);
      transition: var(--transition-smooth);
      display: inline-block;
      animation: breath 2.5s infinite ease-in-out;
    }

    @keyframes breath {
      0% { box-shadow: 0 4px 15px rgba(255,107,53,0.4); }
      50% { box-shadow: 0 6px 24px rgba(255,107,53,0.8); }
      100% { box-shadow: 0 4px 15px rgba(255,107,53,0.4); }
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A1F3F 0%, #051024 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,180,216,0.15) 0%, transparent 40%);
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 900;
      color: #fff;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #b0c7db;
      margin-bottom: 36px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00B4D8, #0077B6);
      color: #fff;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 4px 18px rgba(0,180,216,0.5);
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 6px 28px rgba(0,180,216,0.8);
      transform: scale(1.03);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #00B4D8;
      color: #00B4D8;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-outline:hover {
      background: #00B4D8;
      color: #0A1F3F;
    }

    .data-dashboard {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 24px;
      padding: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .stat-item h3 {
      font-size: 28px;
      color: var(--vivid-orange);
      font-weight: 700;
    }

    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    /* 优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .adv-card {
      background: #fff;
      border-radius: 16px;
      padding: 32px 24px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.05);
      transition: var(--transition-smooth);
    }

    /* 主营业务瀑布流 */
    .magazine-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .magazine-card {
      background: rgba(10,31,63,0.03);
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.7);
      border: 1px solid rgba(0,180,216,0.2);
      border-radius: 20px;
      overflow: hidden;
      transition: var(--transition-smooth);
    }

    .magazine-card.large {
      grid-column: span 2;
    }

    /* 案例滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      margin-top: 40px;
    }

    .case-card {
      min-width: 320px;
      background: #fff;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }

    .left-col, .right-col {
      flex: 1;
      padding: 32px;
      border-radius: 24px;
    }

    .left-col {
      background: #2D2D3A;
      color: #ccc;
    }

    .right-col {
      background: #0A1F3F;
      border: 2px solid #00B4D8;
      color: #fff;
    }

    /* FAQ */
    .accordion-item {
      background: #f0f4fa;
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-btn {
      width: 100%;
      text-align: left;
      padding: 20px;
      font-weight: 600;
    }

    /* CTA */
    .cta-banner {
      background: #060E1A;
      padding: 80px 0;
      text-align: center;
    }

    footer {
      background: #0A1F3F;
      color: #ccc;
      padding: 60px 0 20px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; }
      .magazine-grid { grid-template-columns: 1fr; }
      .magazine-card.large { grid-column: span 1; }
      .compare-table { flex-direction: column; }
    }