/* roulang page: index */
:root {
      --primary-deep: #0A1929;
      --primary-bg: #0A1929;
      --secondary-bg: #112240;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-dark: #0A1929;
      --light-bg: #F0F4F8;
      --border-light: rgba(0, 229, 255, 0.15);
      --border-subtle: rgba(255, 255, 255, 0.06);
      --glass-bg: rgba(17, 34, 64, 0.7);
      --glass-blur: blur(16px);
      --shadow-glow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-cyan: 0 0 20px rgba(0, 229, 255, 0.3);
      --shadow-orange: 0 0 20px rgba(255, 107, 53, 0.5);
      --radius-card: 16px;
      --radius-btn: 8px;
      --max-width: 1280px;
      --gap-section: 120px;
      --gap-card: 24px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Mono', monospace;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--primary-deep);
    }

    body {
      font-family: var(--font-body);
      background-color: var(--primary-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      min-height: 100vh;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .main-header.scrolled {
      background: rgba(10, 25, 41, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--accent-cyan);
      line-height: 1;
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      font-size: 15px;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }

    .nav-cta {
      background: var(--accent-cyan);
      color: var(--text-dark) !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
      transition: all 0.3s ease;
      margin-left: 8px;
    }

    .nav-cta:hover {
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.7);
      transform: scale(1.03);
      background: #33eaff;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 25, 41, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      z-index: 999;
      border-top: 1px solid var(--border-light);
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 18px;
      color: var(--text-primary);
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: radial-gradient(circle at 30% 20%, rgba(0,229,255,0.08) 0%, transparent 50%);
      position: relative;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: 2px;
      color: white;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: #0A1929;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
      transition: all 0.3s ease;
      font-size: 16px;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.8);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
    }

    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.1);
    }

    .glass-panel {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-glow);
    }

    .data-snippet {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .data-item {
      text-align: center;
    }

    .data-number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: white;
    }

    .section-desc {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 核心优势 1大2小 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .adv-large {
      grid-row: span 2;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-glow);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      box-shadow: var(--shadow-cyan);
    }

    .adv-icon {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }

    /* 功能矩阵 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: #112240;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 24px;
      transition: border 0.3s;
    }

    .feature-card:hover {
      border-color: var(--accent-cyan);
    }

    /* 使用场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-img {
      flex: 1;
      background: #112240;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    /* 成功案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--accent-cyan) #112240;
    }

    .case-card {
      min-width: 280px;
      background: #112240;
      border-radius: var(--radius-card);
      padding: 24px;
    }

    /* FAQ */
    .faq-item {
      background: #112240;
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0A1929 0%, #112240 100%);
      text-align: center;
      padding: 80px 24px;
    }

    .btn-cta-large {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      padding: 16px 48px;
      font-size: 18px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 20px rgba(255, 107, 53, 0.6);
      transition: all 0.3s;
    }

    .btn-cta-large:hover {
      box-shadow: 0 0 30px rgba(255, 107, 53, 0.9);
      transform: scale(1.03);
    }

    /* 页脚 */
    .footer {
      background: #0A1929;
      border-top: 1px solid var(--border-light);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; }
      .feature-grid { grid-template-columns: repeat(2,1fr); }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .feature-grid { grid-template-columns: 1fr; }
    }