/* roulang page: index */
:root {
      --primary: #E53E3E;
      --primary-dark: #C53030;
      --accent: #F6AD55;
      --accent-glow: rgba(246, 173, 85, 0.25);
      --dark: #2D3748;
      --darker: #1A202C;
      --gray-50: #FAFAFA;
      --gray-100: #F7FAFC;
      --gray-200: #EDF2F7;
      --gray-300: #E2E8F0;
      --gray-500: #A0AEC0;
      --gray-600: #718096;
      --gray-700: #4A5568;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.2s ease-in-out;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--gray-50);
      color: var(--dark);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all var(--transition);
      border-radius: var(--radius-btn);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .header {
      background: var(--white);
      border-bottom: 1px solid var(--gray-300);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--dark);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      font-weight: 500;
      color: var(--gray-700);
    }

    .nav-links a {
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }

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

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .search-decor {
      background: var(--gray-100);
      border: 1px solid var(--gray-200);
      border-radius: 2rem;
      padding: 0.5rem 1.2rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--gray-500);
      font-size: 0.9rem;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 0.65rem 1.8rem;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(229, 62, 62, 0.3);
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(229, 62, 62, 0.45);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.55rem 1.8rem;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(229, 62, 62, 0.04);
    }

    .btn-accent {
      background: var(--accent);
      color: var(--darker);
      font-weight: 700;
      padding: 0.8rem 2.5rem;
      box-shadow: 0 6px 18px var(--accent-glow);
    }

    .btn-accent:hover {
      background: #ED8936;
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--dark);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(229,62,62,0.75) 0%, rgba(45,55,72,0.5) 70%);
    }

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

    .hero h1 {
      font-size: clamp(2.4rem, 7vw, 4rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
      background: linear-gradient(to right, #fff, #FEEBC8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.92;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }

    /* 通用板块 */
    section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--darker);
      margin-bottom: 0.75rem;
      letter-spacing: -0.3px;
    }

    .section-sub {
      color: var(--gray-600);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(229,62,62,0.08);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 2rem;
      margin-bottom: 1.5rem;
      transition: 0.2s;
    }

    .card:hover .icon-circle {
      background: var(--primary);
      color: white;
      transform: scale(1.05);
    }

    .card h4 {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }

    /* 优势条 */
    .advantages-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      text-align: center;
    }

    .stat-item {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-sm);
    }

    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(229,62,62,0.25);
      transition: 0.3s;
    }

    .case-card:hover .case-img::after {
      background: rgba(229,62,62,0.1);
    }

    .case-text {
      padding: 1.5rem;
    }

    /* 流程 */
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
      gap: 1rem;
      flex-wrap: wrap;
    }

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

    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      margin: 0 auto 1rem;
      box-shadow: 0 4px 12px rgba(229,62,62,0.35);
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      padding: 1.5rem 2rem;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      background: none;
      border: none;
      text-align: left;
      color: var(--darker);
    }

    .faq-answer {
      padding: 0 2rem 1.5rem;
      color: var(--gray-700);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--darker);
      color: white;
      text-align: center;
      padding: 4.5rem 2rem;
      border-radius: 28px;
      margin: 2rem 0;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 2.5rem;
    }

    .footer-bottom {
      border-top: 1px solid var(--gray-300);
      margin-top: 3rem;
      padding-top: 1.8rem;
      text-align: center;
      color: var(--gray-600);
    }

    @media (max-width: 1024px) {
      .grid-3, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    @media (max-width: 640px) {
      .container {
        padding: 0 1.5rem;
      }
      .grid-3, .cases-grid {
        grid-template-columns: 1fr;
      }
      .advantages-grid {
        flex-direction: column;
        align-items: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        min-height: 70vh;
      }
      .search-decor {
        display: none;
      }
    }