/* roulang page: index */
:root {
      --primary-deep: #0B1A2F;
      --secondary-bg: #132B44;
      --global-bg: #0F2239;
      --accent-cyan: #00E5FF;
      --accent-amber: #FFB74D;
      --text-white: #FFFFFF;
      --text-light-blue: #E0F0FF;
      --text-body: #B0C7DB;
      --text-muted: #7A8FA6;
      --card-glass-bg: rgba(19, 43, 68, 0.7);
      --card-border: rgba(0, 229, 255, 0.15);
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 32px rgba(0,229,255,0.15);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--global-bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .wm-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 26, 47, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      z-index: 100;
      padding: 0.75rem 0;
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF 0%, #66F0FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--accent-cyan);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-light-blue);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      border-bottom-color: var(--accent-cyan);
    }

    .mega-trigger {
      position: relative;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-light-blue);
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .mega-trigger i {
      font-size: 0.8rem;
      transition: transform 0.2s;
    }
    .mega-menu {
      position: absolute;
      top: 100%;
      right: 0;
      margin-top: 0.75rem;
      width: 600px;
      background: rgba(15, 34, 57, 0.98);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(0, 229, 255, 0.25);
      border-radius: 0 0 12px 12px;
      padding: 1.8rem;
      display: none;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      z-index: 200;
    }
    .mega-trigger:hover .mega-menu,
    .mega-trigger:focus-within .mega-menu {
      display: grid;
    }
    .mega-col h4 {
      color: var(--accent-cyan);
      font-size: 1rem;
      margin-bottom: 0.8rem;
      font-weight: 600;
    }
    .mega-col a {
      display: block;
      color: var(--text-body);
      padding: 0.3rem 0;
      font-size: 0.9rem;
      text-decoration: none;
      border-bottom: none;
    }
    .mega-col a:hover {
      color: var(--accent-cyan);
      background: rgba(0,229,255,0.05);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-white);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links { gap: 1.2rem; }
      .mega-menu { width: 450px; }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(11,26,47,0.98);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        border-bottom: 1px solid var(--accent-cyan);
      }
      .nav-links.show { display: flex; }
      .mega-menu {
        position: static;
        width: 100%;
        grid-template-columns: 1fr;
        display: none;
        margin-top: 0.5rem;
      }
      .mega-trigger:hover .mega-menu,
      .mega-trigger:focus-within .mega-menu { display: grid; }
    }

    /* 板块通用 */
    section {
      padding: 5rem 0;
      scroll-margin-top: 70px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 0.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 50px;
      height: 3px;
      background: var(--accent-cyan);
      margin-top: 0.5rem;
    }
    .bg-dark { background-color: var(--primary-deep); }
    .bg-mid { background-color: var(--secondary-bg); }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a3149 0%, #0B1A2F 80%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      color: white;
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      font-size: 1.1rem;
      color: #B0C7DB;
      margin-bottom: 2rem;
    }
    .btn-group { display: flex; gap: 1rem; flex-wrap: wrap; }
    .btn-primary {
      background: var(--accent-amber);
      color: #0B1A2F;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: 8px;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: 0 0 18px rgba(255,183,77,0.5);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover { background: #FFA726; color: #0B1A2F; }
    .btn-outline {
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 0.85rem 2rem;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover { background: rgba(0,229,255,0.08); }
    .hero-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: 0 0 25px rgba(0,229,255,0.3);
      animation: float 3s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .pain-card {
      background: #0F2239;
      border-left: 5px solid var(--accent-amber);
      padding: 1.8rem;
      border-radius: 8px;
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .glass-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .glass-card:hover {
      transform: translateY(-5px);
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-hover);
    }
    .glass-card img {
      width: 100%;
      border-radius: 8px;
      margin-bottom: 1rem;
    }

    /* 优势 */
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .big-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent-amber);
      line-height: 1;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }

    /* FAQ */
    .accordion-title {
      color: var(--accent-cyan);
      font-weight: 600;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0B2A45, #0B1A2F);
      text-align: center;
    }

    footer {
      background: #091625;
      color: #B0C7DB;
      padding: 3rem 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 768px) {
      .hero-grid, .adv-grid, .footer-grid { grid-template-columns: 1fr; }
      .pain-grid, .solution-grid { grid-template-columns: 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2rem; }
    }