/* roulang page: index */
:root {
      --primary: #0A0E17;
      --accent: #D4AF37;
      --bg: #F5F5F0;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-light: #5C5C5C;
      --border: #E0E0D8;
      --success: #2E7D32;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-num: "DIN Alternate", "PingFang SC", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
      color: #FFFFFF;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
    }

    .logo {
      font-weight: 800;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: inherit;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      color: inherit;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }

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

    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #C5A028;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(212,175,55,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-block;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #F5F5F0;
    }

    .btn-light {
      border-color: #FFFFFF;
      color: #FFFFFF;
    }

    .btn-light:hover {
      background: #FFFFFF;
      color: var(--primary);
    }

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

    .hamburger span {
      width: 25px;
      height: 2px;
      background: #FFFFFF;
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      background-color: var(--primary);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      color: #FFFFFF;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(90deg, rgba(10,14,23,0.85) 0%, rgba(10,14,23,0.4) 100%);
    }

    .hero-content {
      position: relative;
      max-width: 600px;
      animation: fadeUp 0.8s ease;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: #B0B0B0;
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-bottom: 12px;
    }

    .section-title p {
      color: var(--text-light);
      font-size: 16px;
      max-width: 600px;
      margin: 0 auto;
    }

    .grid {
      display: grid;
      gap: 32px;
    }

    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      border: 1px solid var(--border);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .icon-gold {
      font-size: 48px;
      color: var(--accent);
      margin-bottom: 16px;
      display: block;
    }

    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .tag {
      font-size: 13px;
      font-weight: 500;
      background: #EEECE2;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
      transition: transform 0.3s;
    }

    .service-card:hover img {
      transform: scale(1.03);
    }

    .data-block {
      background: var(--primary);
      color: #FFFFFF;
      text-align: center;
      padding: 60px 0;
    }

    .stat-number {
      font-family: var(--font-num);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }

    .stat-label {
      font-size: 16px;
      color: #B0B0B0;
      margin-top: 8px;
    }

    .solution-row {
      display: flex;
      gap: 60px;
      align-items: center;
    }

    .steps .step {
      display: flex;
      gap: 20px;
      margin-bottom: 32px;
    }

    .step-num {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-light);
      background: #FAFAF5;
      padding: 0 10px;
      margin-top: 8px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 10px;
    }

    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 100px 0;
      color: #FFFFFF;
    }

    footer {
      background: var(--primary);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    footer a {
      color: #B0B0B0;
      text-decoration: none;
      transition: color 0.2s;
    }

    footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-2 { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .hero h1 { font-size: 40px; }
    }

    @media (max-width: 640px) {
      .container { padding: 0 16px; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
      .hero-buttons .btn-primary, .hero-buttons .btn-outline { width: 100%; text-align: center; }
      .navbar { padding: 0 20px; }
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 30px;
      z-index: 999;
      transform: translateX(-100%);
      transition: transform 0.3s;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: #FFFFFF;
      font-size: 24px;
      text-decoration: none;
    }