/* roulang page: index */
:root {
      --primary: #0A4D3C;
      --primary-dark: #083C2E;
      --primary-light: #0D6B55;
      --accent: #F5A623;
      --accent-hover: #E09515;
      --bg: #FAFBF7;
      --surface: #FFFFFF;
      --text-primary: #1A2B2F;
      --text-secondary: #6B7B7D;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(10,77,60,0.08);
      --shadow-card: 0 4px 20px rgba(10,77,60,0.06);
      --shadow-card-hover: 0 12px 32px rgba(10,77,60,0.12);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.25);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.3);
      box-shadow: var(--shadow-nav);
      transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(250,251,247,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      border-bottom: 1px solid transparent;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 24px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

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

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

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

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
      z-index: 110;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
      border-radius: 2px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A4D3C 0%, #0D6B55 100%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.12;
      mix-blend-mode: overlay;
    }

    .hero-grid {
      position: absolute;
      inset: 0;
      background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }

    .hero h1 {
      font-size: clamp(40px, 6vw, 58px);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 36px;
      line-height: 1.6;
      max-width: 500px;
    }

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

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(245,166,35,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: white;
      opacity: 0.8;
      font-size: 24px;
    }

    @keyframes bounce {
      0%, 100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(-8px); }
    }

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

    .section-title {
      font-size: 34px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 17px;
      max-width: 600px;
      margin-bottom: 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--surface);
      padding: 32px 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border-left: 4px solid transparent;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-left-color: var(--accent);
    }

    .service-icon {
      font-size: 32px;
      color: var(--accent);
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }

    /* 数据优势 */
    .stats-bg {
      background: #F0F4F2;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-size: 52px;
      font-weight: 700;
      color: var(--accent);
      font-feature-settings: "tnum";
      font-variant-numeric: tabular-nums;
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 15px;
      margin-top: 8px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      display: flex;
      transition: 0.3s;
    }

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

    .case-img {
      width: 120px;
      background: #f0f0f0;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 16px;
    }

    .case-img img {
      object-fit: cover;
      border-radius: 8px;
      filter: grayscale(0.2);
    }

    .case-info {
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .case-info h4 {
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 8px;
    }

    /* 流程 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 24px;
    }

    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }

    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }

    .step h4 {
      font-weight: 600;
      margin-bottom: 8px;
    }

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

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      color: var(--text-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-secondary);
      padding: 0 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 0 8px;
    }

    .faq-icon {
      color: var(--accent);
      font-size: 22px;
      transition: transform 0.3s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-block {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-lg);
      margin: 0 24px;
    }

    .cta-block h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    .footer {
      background: #1A2B2F;
      color: #B0C0C0;
      padding: 64px 0 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer a {
      color: #B0C0C0;
      font-size: 14px;
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .services-grid, .cases-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
      .btn-group .btn { width: 100%; justify-content: center; }
      section { padding: 72px 0; }
      .steps-container { flex-direction: column; align-items: center; }
    }