/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0A3A62;
      --primary-light-bg: #E8F0F8;
      --accent-gold: #C8963E;
      --accent-green: #1B8A6B;
      --bg-light: #F4F7FA;
      --bg-white: #FFFFFF;
      --text-body: #2C3E50;
      --text-muted: #6B7B8D;
      --text-footer: #B0C4D8;
      --footer-bg: #1A2D3F;
      --border-light: #DDE4EC;
      --shadow-card: 0 2px 12px rgba(15, 76, 129, 0.06);
      --shadow-card-hover: 0 8px 28px rgba(15, 76, 129, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Segoe UI", sans-serif;
      --transition: 0.25s ease;
      --max-width: 1200px;
      --section-padding: 100px 0;
    }

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

    body {
      font-family: var(--font-sans);
      color: var(--text-body);
      background-color: var(--bg-light);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-img);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 500;
      transition: var(--transition);
      border-radius: var(--radius-btn);
      white-space: nowrap;
    }

    h1, h2, h3 {
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      font-weight: 700;
      color: var(--primary-dark);
    }

    h2 {
      font-size: 36px;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }

    h3 {
      font-size: 22px;
      font-weight: 500;
      color: var(--text-body);
    }

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-title p {
      color: var(--text-muted);
      font-size: 18px;
      max-width: 680px;
      margin: 0 auto;
    }

    /* 导航栏 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
      background: transparent;
      color: white;
    }

    .main-header.scrolled {
      background: var(--bg-white);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      color: var(--primary);
      padding: 10px 0;
    }

    .main-header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: inherit;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent-gold);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L15 10H22L16 15L18 23L12 18L6 23L8 15L2 10H9L12 2Z" fill="currentColor"/></svg>') center/cover;
      background-color: currentColor;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      font-size: 16px;
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
      color: inherit;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent-gold);
      transition: width 0.2s;
      border-radius: 2px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
    }

    .btn-outline:hover {
      background: var(--primary-light-bg);
    }

    .btn-gold {
      background: var(--accent-gold);
      color: white;
      padding: 14px 36px;
      font-weight: 600;
      border-radius: var(--radius-btn);
    }

    .btn-gold:hover {
      filter: brightness(1.1);
    }

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

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
        color: var(--text-body);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1;
    }

    .badge {
      background: rgba(200, 150, 62, 0.12);
      color: var(--accent-gold);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 20px;
    }

    .hero-text h1 {
      margin-bottom: 20px;
    }

    .hero-text p {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 420px;
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }

    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
      }
      .hero-image {
        width: 100%;
        min-height: 300px;
      }
      h1 {
        font-size: 36px;
      }
    }

    /* 数据亮点 */
    .stats {
      padding: 80px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-item {
      background: white;
      padding: 40px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 12px;
      font-weight: 500;
    }

    /* 服务矩阵 */
    .services {
      padding: var(--section-padding);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: var(--primary-light-bg);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 28px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .arrow-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 16px;
      display: inline-block;
    }
    .arrow-link:hover {
      transform: translateX(4px);
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .services-grid, .stats-grid { grid-template-columns: 1fr; }
      h2 { font-size: 30px; }
    }

    /* 案例瀑布流 */
    .cases {
      padding: var(--section-padding);
      background: white;
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px;
    }
    @media (max-width: 1024px) { .masonry { columns: 2; } }
    @media (max-width: 768px) { .masonry { columns: 1; } }

    /* 对比表 */
    .compare {
      padding: var(--section-padding);
      background: var(--bg-light);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      max-width: 900px;
      margin: 0 auto;
    }
    .compare-col {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
    }
    .compare-col.left {
      background: #f0f3f7;
      opacity: 0.8;
    }
    .compare-col.right {
      border-left: 4px solid var(--accent-gold);
      box-shadow: var(--shadow-card);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
    }
    .green-check {
      color: var(--accent-green);
      font-weight: bold;
    }
    @media (max-width: 768px) {
      .compare-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq {
      padding: var(--section-padding);
      background: white;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      color: var(--text-body);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFB;
      border-left: 4px solid var(--accent-gold);
      padding: 0 20px;
      margin-bottom: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px;
    }

    /* CTA */
    .cta-band {
      background: #0A2F4A;
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      color: white;
    }

    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--text-footer);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }