/* roulang page: index */
:root {
      --primary: #6C1D5A;
      --primary-dark: #3E0F35;
      --accent: #F0A500;
      --accent-light: #FFF3D6;
      --dark: #1A1A1A;
      --gray-bg: #FAFAFA;
      --white: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #5A5A5A;
      --border-light: #E8E8E8;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 40px;
      --font-heading: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background: var(--gray-bg);
      color: var(--text);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-icon {
      font-size: 2rem;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text);
      font-size: 1rem;
      padding: 8px 0;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      box-shadow: 0 4px 12px rgba(108,29,90,0.3);
    }
    .nav-cta:hover {
      filter: brightness(1.1);
      transform: translateY(-1px);
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .burger span {
      width: 26px;
      height: 2.5px;
      background: var(--text);
      border-radius: 4px;
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.08);
        transform: translateY(-120%);
        opacity: 0;
        transition: 0.35s ease;
        pointer-events: none;
        z-index: 40;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .burger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #6C1D5A 0%, #3E0F35 100%);
      padding: 60px 0;
      color: white;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #1A1A1A;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      border: none;
      cursor: pointer;
      transition: 0.3s;
      background: linear-gradient(135deg, #F0A500, #E69500);
      box-shadow: 0 8px 20px rgba(240,165,0,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.08);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 420px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      position: relative;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-title {
        font-size: 36px;
      }
      .hero-image {
        height: 280px;
      }
    }

    /* 亮点网格 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text);
    }
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      background: #F9F0F7;
    }
    .stat-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .stat-icon {
      font-size: 2.5rem;
      margin-bottom: 12px;
    }
    .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
      margin-top: 8px;
    }
    @media (max-width: 1024px) {
      .highlight-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-content {
      padding: 24px;
    }
    .service-content h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    .link-more {
      color: var(--primary);
      font-weight: 600;
      display: inline-block;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .case-grid {
      column-count: 3;
      column-gap: 24px;
      margin-top: 40px;
    }
    .case-item {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-item:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 260px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 16px;
      background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
      color: white;
      margin-top: -60px;
      position: relative;
    }
    @media (max-width: 768px) {
      .case-grid {
        column-count: 1;
      }
    }

    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .compare-card {
      padding: 32px;
      border-radius: var(--radius-xl);
      background: #f2f2f2;
    }
    .compare-card.premium {
      background: linear-gradient(135deg, #F9F0F7, #ffffff);
      border: 1px solid var(--primary);
    }
    .compare-list {
      list-style: none;
      margin-top: 24px;
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    @media (max-width: 768px) {
      .compare-row {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FAFAFA;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      background: #F9F0F7;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #6C1D5A, #3E0F35);
      color: white;
      padding: 80px 0;
      border-radius: 0;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .cta-form input {
      flex: 1;
      padding: 14px 16px;
      border-radius: 8px;
      border: none;
      background: white;
    }
    .footer {
      background: #1A1A1A;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }