/* roulang page: index */
:root {
      --color-primary: #C2185B;
      --color-primary-dark: #A01543;
      --color-secondary: #1A1A2E;
      --color-secondary-light: #222240;
      --color-accent: #00E5FF;
      --color-bg-light: #F5F0EB;
      --color-bg-white: #FFFFFF;
      --color-text-dark: #1A1A2E;
      --color-text-mid: #555555;
      --color-text-light: #B0B0C0;
      --color-text-white: #FFFFFF;
      --color-border: rgba(255,255,255,0.1);
      --color-card-bg: rgba(255,255,255,0.05);
      --font-body: 'Noto Sans SC', 'PingFang SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', 'Montserrat', sans-serif;
      --radius-card: 12px;
      --radius-button: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.12);
      --spacing-section: 100px;
    }

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

    body {
      font-family: var(--font-body);
      line-height: 1.7;
      background-color: var(--color-bg-white);
      color: var(--color-text-dark);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航双行结构 */
    .brand-nav {
      background-color: var(--color-secondary);
      padding: 12px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-nav .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--color-text-white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .brand-nav .logo i {
      color: var(--color-primary);
      margin-right: 10px;
      font-size: 1.8rem;
    }
    .brand-nav .action-btn {
      background-color: var(--color-primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .brand-nav .action-btn:hover {
      background-color: var(--color-primary-dark);
      box-shadow: 0 0 12px rgba(194,24,91,0.4);
    }
    .channel-nav {
      background-color: var(--color-secondary-light);
      padding: 8px 0;
      overflow-x: auto;
      white-space: nowrap;
    }
    .channel-nav .channel-list {
      display: flex;
      justify-content: center;
      gap: 2rem;
    }
    .channel-nav .channel-item {
      color: var(--color-text-white);
      font-size: 0.9rem;
      font-weight: 500;
      padding: 6px 4px;
      position: relative;
      transition: color 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .channel-nav .channel-item i {
      font-size: 0.9rem;
    }
    .channel-nav .channel-item::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background-color: var(--color-accent);
      transition: width 0.3s ease;
    }
    .channel-nav .channel-item:hover {
      color: var(--color-accent);
    }
    .channel-nav .channel-item:hover::after {
      width: 100%;
    }

    /* 移动端汉堡 */
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: none;
      border: none;
      cursor: pointer;
    }
    .off-canvas-menu {
      position: fixed;
      top: 0;
      left: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--color-secondary);
      z-index: 1000;
      padding: 2rem 1rem;
      transition: left 0.4s ease;
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    .off-canvas-menu.active {
      left: 0;
    }
    .off-canvas-menu a {
      color: white;
      font-size: 1.2rem;
      padding: 12px;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at center, transparent 20%, var(--color-secondary) 100%);
      opacity: 0.8;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      margin-bottom: 2rem;
      color: rgba(255,255,255,0.9);
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--color-primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .btn-primary:hover {
      background: var(--color-primary-dark);
      box-shadow: 0 0 14px rgba(194,24,91,0.5);
    }
    .btn-outline {
      border: 2px solid var(--color-primary);
      color: white;
      padding: 12px 34px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: var(--color-primary);
    }

    section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--color-primary);
      margin-top: 8px;
    }
    .light-bg {
      background-color: var(--color-bg-light);
    }
    .dark-bg {
      background-color: var(--color-secondary);
      color: white;
    }

    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      overflow: hidden;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border: 1px solid var(--color-primary);
    }

    /* 服务混合布局 */
    .service-featured {
      display: flex;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 2rem;
    }
    .service-featured img {
      width: 45%;
      object-fit: cover;
    }
    .service-small-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
    }

    .advantage-row {
      display: flex;
      align-items: center;
      margin-bottom: 3rem;
      gap: 2rem;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .faq-item {
      background: #F9F9FB;
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: #444;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    footer {
      background: var(--color-secondary);
      color: var(--color-text-light);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      .hero h1 { font-size: 2.5rem; }
    }
    @media (max-width: 768px) {
      .channel-nav { display: none; }
      .hamburger { display: block; }
      .service-featured { flex-direction: column; }
      .service-featured img { width: 100%; height: 200px; }
      .advantage-row, .advantage-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }