/* roulang page: index */
:root {
      --primary: #1A3C5E;
      --primary-dark: #0F2A44;
      --accent: #C8A45C;
      --accent-light: #D9B86E;
      --bg-warm: #F5F3EF;
      --white: #FFFFFF;
      --text-main: #1E2A35;
      --text-secondary: #5A6570;
      --text-muted: #8C959F;
      --border-light: #E5E0D9;
      --shadow-card: 0 2px 12px rgba(26, 60, 94, 0.06);
      --shadow-hover: 0 8px 30px rgba(26, 60, 94, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', system-ui, sans-serif;
      --transition: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--primary);
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: 700;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease, left 0.3s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      font-size: 15px;
      transition: background 0.25s, transform 0.2s, box-shadow 0.25s;
      box-shadow: 0 2px 6px rgba(26, 60, 94, 0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(26, 60, 94, 0.25);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      font-size: 15px;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
      transform: translateY(-2px);
    }

    .btn-accent {
      background: var(--accent);
      color: var(--primary-dark);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 0.5px;
      cursor: pointer;
      text-decoration: none;
      font-size: 16px;
      transition: background 0.25s, transform 0.2s;
      display: inline-block;
    }

    .btn-accent:hover {
      background: var(--accent-light);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
      z-index: 1001;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-main);
      transition: all 0.3s ease;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: white;
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s, visibility 0.3s;
    }

    .mobile-menu.active {
      opacity: 1;
      visibility: visible;
    }

    .mobile-menu a {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: none;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      max-height: 900px;
      background: linear-gradient(135deg, rgba(26,60,94,0.35) 0%, rgba(15,42,68,0.15) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      margin-top: 72px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }

    .hero-text {
      max-width: 600px;
      color: white;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-size: 48px;
      line-height: 1.15;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.7;
      color: rgba(255,255,255,0.9);
      max-width: 480px;
      margin-bottom: 36px;
    }

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

    .hero-data {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .data-card {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 20px;
      color: white;
      min-width: 160px;
    }

    .data-number {
      font-family: var(--font-number);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
    }

    .data-label {
      font-size: 13px;
      opacity: 0.9;
    }

    /* sections */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 36px;
      font-weight: 600;
      letter-spacing: -0.3px;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 650px;
      margin: 0 auto 48px;
      text-align: center;
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: transform 0.3s, box-shadow 0.3s;
    }

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

    .advantage-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      color: var(--accent);
      stroke: var(--accent);
      fill: none;
      stroke-width: 1.5;
    }

    .advantage-card h3 {
      color: var(--primary);
      margin-bottom: 12px;
      font-size: 22px;
    }

    /* 服务交替 */
    .service-row {
      display: flex;
      align-items: center;
      margin-bottom: 80px;
      gap: 40px;
    }

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

    .service-img {
      flex: 0 0 58%;
      border-radius: var(--radius-card);
      overflow: hidden;
      height: 400px;
    }

    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }

    .service-img:hover img {
      transform: scale(1.02);
    }

    .service-text {
      flex: 1;
    }

    .service-number {
      font-family: var(--font-number);
      font-size: 64px;
      font-weight: 800;
      color: rgba(200,164,92,0.2);
      line-height: 1;
      margin-bottom: 8px;
    }

    .service-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .tag {
      background: var(--bg-warm);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      letter-spacing: 0.5px;
    }

    /* 数据看板 */
    .stats-band {
      background: var(--bg-warm);
      padding: 60px 0;
    }

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

    .stat-item .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .stat-number::after {
      content: '';
      display: block;
      width: 60%;
      height: 3px;
      background: rgba(200,164,92,0.4);
      margin: 8px auto 0;
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
      position: relative;
    }

    .case-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 220px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }

    .case-card:hover .case-img img {
      transform: scale(1.05);
    }

    .case-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: var(--accent);
      color: white;
      font-size: 11px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      margin-bottom: 8px;
    }

    /* 时间线 */
    .timeline {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
      padding-left: 20px;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 19px;
      top: 0;
      bottom: 0;
      width: 2px;
      border-left: 2px dashed var(--border-light);
    }

    .timeline-item {
      display: flex;
      gap: 32px;
      margin-bottom: 48px;
      position: relative;
    }

    .timeline-marker {
      width: 24px;
      height: 24px;
      background: var(--primary);
      border-radius: 50%;
      border: 4px solid var(--accent);
      flex-shrink: 0;
      margin-top: 4px;
      z-index: 2;
    }

    .timeline-content {
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      max-width: 420px;
    }

    .step-num {
      font-size: 14px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 2px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .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;
      color: var(--text-main);
      transition: color 0.2s;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
    }

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

    .faq-item.active .faq-question {
      color: var(--primary);
      background: #FAF9F7;
    }

    .arrow {
      transition: transform 0.3s;
    }

    .faq-item.active .arrow {
      transform: rotate(180deg);
    }

    /* CTA banner */
    .cta-band {
      background: var(--primary-dark);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .cta-band h2 {
      color: white;
      margin-bottom: 16px;
    }

    .cta-band p {
      color: rgba(255,255,255,0.75);
      font-size: 18px;
      max-width: 600px;
      margin: 0 auto 32px;
    }

    /* Footer */
    .footer {
      background: var(--primary-dark);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
    }

    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .social-icons {
      display: flex;
      gap: 12px;
      margin-top: 16px;
    }

    .social-circle {
      width: 36px;
      height: 36px;
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      transition: 0.2s;
      text-decoration: none;
    }

    .social-circle:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 12px;
      color: rgba(255,255,255,0.4);
    }

    @media (max-width: 1024px) {
      .advantages-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-row {
        flex-direction: column;
      }
      .service-img {
        width: 100%;
        height: 280px;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .header .btn-primary {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: flex;
      }
      .hero {
        height: auto;
        padding: 120px 0 60px;
      }
      .hero-content {
        flex-direction: column;
      }
      .hero-data {
        flex-direction: row;
        width: 100%;
        justify-content: space-between;
      }
      .advantages-grid, .cases-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .timeline::before {
        left: 11px;
      }
      .section {
        padding: 60px 0;
      }
    }