/* roulang page: index */
:root {
      --primary: #E8452D;
      --primary-dark: #C0392B;
      --secondary: #1A1D29;
      --background: #F9FAFB;
      --card-bg: #FFFFFF;
      --accent: #FFB800;
      --success: #10B981;
      --text-main: #111827;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --text-on-dark: #F9FAFB;
      --border-light: #E5E7EB;
      --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
      --card-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.1);
      --radius-lg: 1.5rem;
      --radius-md: 1rem;
      --radius-sm: 0.5rem;
      --transition: 0.25s ease;
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-system: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 5rem;
    }

    body {
      font-family: var(--font-system);
      background-color: var(--background);
      color: var(--text-body);
      line-height: 1.625;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      transition: box-shadow var(--transition);
      height: 4.5rem;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
    }

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

    .brand-logo {
      font-family: var(--font-inter);
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      white-space: nowrap;
    }

    .brand-logo span {
      color: var(--secondary);
      font-weight: 700;
      font-size: 0.9rem;
      background: #FEE2E2;
      padding: 0.15rem 0.6rem;
      border-radius: 999px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2.2rem;
      list-style: none;
    }

    .nav-menu a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--secondary);
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: 0.2s ease;
      transform: translateX(-50%);
    }

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

    .nav-menu a:hover::after {
      width: 70%;
    }

    .nav-cta-btn {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.5rem 1.4rem;
      border-radius: 999px;
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 10px rgba(232, 69, 45, 0.3);
      white-space: nowrap;
    }

    .nav-cta-btn:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 14px rgba(192, 57, 43, 0.4);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: white;
      z-index: 100;
      box-shadow: -10px 0 25px rgba(0,0,0,0.1);
      transition: right 0.3s ease;
      padding: 2rem 1.5rem;
      display: flex;
      flex-direction: column;
    }

    .mobile-drawer.open {
      right: 0;
    }

    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 99;
      display: none;
    }

    .drawer-overlay.active {
      display: block;
    }

    .mobile-drawer a {
      font-size: 1.3rem;
      font-weight: 600;
      padding: 1rem 0;
      border-bottom: 1px solid #eee;
      color: var(--secondary);
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #FFFFFF 0%, #FEF2F2 100%);
      padding: 2rem 0 4rem;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-text h1 {
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .hero-text .highlight {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2.2rem;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .btn {
      display: inline-block;
      padding: 0.85rem 2rem;
      border-radius: 999px;
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s;
      cursor: pointer;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 8px 18px rgba(232, 69, 45, 0.35);
      border: none;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
      box-shadow: 0 14px 24px rgba(192, 57, 43, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

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

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 2.5rem;
      height: 380px;
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(232,69,45,0.05), rgba(26,29,41,0.2));
    }

    /* 通用区块 */
    .section {
      padding: 4.5rem 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 0.75rem;
    }

    .section-sub {
      text-align: center;
      color: var(--text-body);
      max-width: 650px;
      margin: 0 auto 3rem;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 2rem;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: box-shadow var(--transition), transform 0.2s;
      text-align: center;
    }

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

    .card-icon {
      width: 72px;
      height: 72px;
      background: rgba(232,69,45,0.08);
      border-radius: 50%;
      margin: 0 auto 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .card-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .service-card h3 {
      font-size: 1.4rem;
      color: var(--text-main);
      margin-bottom: 0.8rem;
    }

    /* 数据徽章 */
    .data-badges {
      background: var(--secondary);
      color: white;
    }

    .badge-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 3rem;
      text-align: center;
    }

    .badge-item .badge-number {
      font-family: var(--font-inter);
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--accent);
      display: block;
    }

    .badge-item .badge-label {
      color: rgba(249,250,251,0.7);
      margin-top: 0.3rem;
    }

    /* 案例卡片 */
    .case-row {
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      overflow: hidden;
    }

    .case-img {
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      min-height: 220px;
    }

    .case-info {
      padding: 2rem;
    }

    .case-info h3 {
      font-size: 1.4rem;
      color: var(--text-main);
    }

    .tag {
      display: inline-block;
      background: rgba(255,184,0,0.2);
      color: #B45309;
      padding: 0.2rem 0.8rem;
      border-radius: 999px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 流程 */
    .steps-line {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

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

    .step-circle {
      width: 52px;
      height: 52px;
      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;
    }

    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }

    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-main);
    }

    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-body);
      display: none;
    }

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

    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary), #D93A21);
      border-radius: 2.5rem;
      padding: 3.5rem 2rem;
      text-align: center;
      color: white;
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: #CBD5E1;
      padding: 3rem 0 1.5rem;
    }

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

    .footer input[type="email"] {
      padding: 0.7rem 1rem;
      border-radius: 999px;
      border: none;
      width: 100%;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-image { height: 260px; }
      .case-card { grid-template-columns: 1fr; }
      .steps-line { flex-direction: column; gap: 2rem; }
      .badge-wall { gap: 2rem; }
    }