/* roulang page: index */
:root {
      --primary: #0A1F2E;
      --primary-light: #132B3A;
      --gold: #D4AF37;
      --accent: #00C9A7;
      --bg: #F5F3EF;
      --white: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #5A5A5A;
      --border: #E8E4DD;
      --radius-sm: 12px;
      --radius: 16px;
      --radius-lg: 24px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-lg: 0 16px 40px rgba(0,0,0,0.08);
      --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container: 1280px;
      --nav-height: 76px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 32px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      transition: background var(--transition), box-shadow var(--transition);
      background: transparent;
    }

    .header.scrolled {
      background: rgba(10, 31, 46, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: 0 4px 30px rgba(0,0,0,0.2);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--white);
      text-shadow: 0 1px 4px rgba(0,0,0,0.2);
      transition: color var(--transition);
    }

    .header.scrolled .logo {
      color: var(--gold);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--gold);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--primary);
      font-weight: 900;
      box-shadow: 0 4px 12px rgba(212, 175, 55, 0.4);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .header.scrolled .nav-links {
      color: rgba(255,255,255,0.9);
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold);
      transition: width var(--transition);
    }

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

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

    .nav-cta {
      background: var(--gold);
      color: var(--primary) !important;
      padding: 10px 24px !important;
      border-radius: 30px;
      font-weight: 700;
      box-shadow: 0 4px 15px rgba(212, 175, 55, 0.5);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    }

    .nav-cta:hover {
      background: var(--accent);
      color: var(--white) !important;
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 201, 167, 0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1100;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--white);
      transition: var(--transition);
      border-radius: 2px;
    }

    .header.scrolled .hamburger span {
      background: var(--gold);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateY(-100%);
      transition: transform 0.5s ease;
      z-index: 1050;
      font-size: 1.6rem;
      font-weight: 600;
      color: var(--white);
    }

    .mobile-menu.active {
      transform: translateY(0);
    }

    .mobile-menu a {
      color: var(--white);
      border-bottom: 2px solid transparent;
    }

    .mobile-menu a:hover {
      color: var(--gold);
      border-bottom-color: var(--gold);
    }

    /* Hero */
    .hero {
      padding: 160px 0 120px;
      background: linear-gradient(135deg, #F5F3EF 0%, #faf8f4 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.08;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 90%;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--gold);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 6px 20px rgba(212,175,55,0.3);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    }

    .btn-primary:hover {
      background: var(--accent);
      color: white;
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(0,201,167,0.5);
    }

    .hero-visual {
      background: rgba(255,255,255,0.4);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-lg);
      position: relative;
    }

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

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 60px;
      font-size: 1.1rem;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .pain-card {
      background: var(--white);
      padding: 36px 28px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--gold);
      transition: var(--transition);
    }

    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }

    .pain-card h3 {
      font-size: 1.3rem;
      margin: 16px 0 12px;
      color: var(--primary);
    }

    /* 解决方案交替布局 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

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

    .solution-text {
      flex: 1;
    }

    .solution-text h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .solution-img {
      flex: 1;
      background: #e9e6df;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow);
    }

    /* 深色数据块 */
    .stats-bg {
      background: var(--primary-light);
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      text-align: center;
    }

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 3.4rem;
      font-weight: 700;
      color: var(--gold);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .testimonial-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      font-style: italic;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
    }

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

    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #0A1C2A;
      color: #ccc;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 1024px) {
      .hero-grid, .solution-row, .solution-row.reverse {
        grid-template-columns: 1fr;
        flex-direction: column;
      }
      .pain-grid, .testimonial-grid, .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-grid, .testimonial-grid, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 { font-size: 2.4rem; }
      section { padding: 70px 0; }
    }