/* roulang page: index */
:root {
      --primary-orange: #FF6B35;
      --primary-blue: #00B4D8;
      --primary-gradient: linear-gradient(135deg, #FF6B35 0%, #00B4D8 100%);
      --primary-gradient-reverse: linear-gradient(135deg, #00B4D8 0%, #FF6B35 100%);
      --bg-light: #F7F9FC;
      --white: #FFFFFF;
      --dark-bg: #1A1A2E;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #6B7280;
      --accent-gold: #FFD166;
      --success-green: #06D6A0;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 1.4rem;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .logo i {
      font-size: 1.6rem;
      background: none;
      -webkit-text-fill-color: #FF6B35;
      color: #FF6B35;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .desktop-nav a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #333;
      padding: 0.5rem 0;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: #FF6B35;
      border-bottom-color: #FF6B35;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: #1A1A2E;
      cursor: pointer;
    }
    /* 移动端侧滑菜单 */
    .mobile-nav-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: rgba(26,26,46,0.97);
      backdrop-filter: blur(20px);
      z-index: 1100;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.5rem;
      transition: right 0.3s ease;
    }
    .mobile-nav-drawer.open {
      right: 0;
    }
    .mobile-nav-drawer .close-btn {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
      margin-bottom: 2rem;
    }
    .mobile-nav-drawer a {
      color: white;
      font-size: 1.3rem;
      padding: 1rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      font-weight: 500;
    }
    /* 底部胶囊导航（移动端） */
    .bottom-capsule-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 0.6rem 1.8rem;
      box-shadow: 0 8px 30px rgba(0,0,0,0.12);
      z-index: 999;
      gap: 1.5rem;
      justify-content: center;
      align-items: center;
    }
    .bottom-capsule-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: #555;
      font-weight: 500;
      transition: color 0.2s;
    }
    .bottom-capsule-nav a i {
      font-size: 1.2rem;
      margin-bottom: 2px;
    }
    .bottom-capsule-nav a.active {
      color: #FF6B35;
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      display: flex;
      align-items: center;
      position: relative;
      background: linear-gradient(135deg, rgba(255,107,53,0.88) 0%, rgba(0,180,216,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      margin-top: 0;
      padding-top: var(--nav-height);
    }
    .hero-content {
      max-width: 700px;
      z-index: 2;
    }
    .hero h1 {
      font-size: clamp(2.2rem, 5vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.25);
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 550px;
    }
    .hero-cta {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.9rem 2rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: white;
      color: #FF6B35;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    .btn-primary:hover {
      background: #f0f0f0;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.15);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }
    .btn-outline:hover {
      background: white;
      color: #FF6B35;
      border-color: white;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      font-size: 1.8rem;
      opacity: 0.8;
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }
    /* Sections */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-primary);
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 650px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }
    .decorative-line {
      width: 60px;
      height: 4px;
      background: var(--primary-gradient);
      border-radius: 4px;
      margin: 0.8rem auto 2rem;
    }
    /* 服务区 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
      margin-top: 2rem;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .large-card {
      background: linear-gradient(145deg, #FFF4ED 0%, #E6F7FB 100%);
      flex-direction: row;
      gap: 2rem;
    }
    .large-card .card-img {
      width: 45%;
      border-radius: var(--radius-md);
      object-fit: cover;
    }
    .standard-card .card-icon {
      width: 64px;
      height: 64px;
      background: var(--primary-gradient);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 1rem;
    }
    .tag {
      background: rgba(255,107,53,0.1);
      color: #FF6B35;
      font-size: 0.8rem;
      padding: 0.3rem 0.9rem;
      border-radius: 20px;
      font-weight: 500;
    }
    /* 数据区 */
    .stats-section {
      background: var(--dark-bg);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-item .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(to right, #FFD166, #FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
      font-size: 1rem;
      margin-top: 0.5rem;
    }
    /* 案例卡片 */
    .cases-grid {
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      display: flex;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 40%;
      object-fit: cover;
    }
    .case-info {
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    /* 流程 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      text-align: center;
      flex:1;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-gradient);
      border-radius: 50%;
      margin: 0 auto 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: #555;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: var(--primary-gradient);
      text-align: center;
      color: white;
    }
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      background: white;
      border-radius: var(--radius-lg);
      padding: 2.5rem;
    }
    .input-field {
      width: 100%;
      padding: 0.9rem;
      border: 1px solid #E0E0E0;
      border-radius: 8px;
      background: #F9FAFB;
      margin-bottom: 1rem;
    }
    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
      .large-card { grid-column: span 2; flex-direction: column; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .contact-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .hamburger { display: block; }
      .bottom-capsule-nav { display: flex; }
      .hero h1 { font-size: 2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .large-card { grid-column: span 1; }
      .case-card { flex-direction: column; }
      .case-img { width: 100%; height: 200px; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .steps-container { flex-direction: column; gap: 2rem; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 70px 0; }
    }