/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-dark: #C93A17;
      --primary-soft: rgba(232, 69, 30, 0.08);
      --secondary-dark: #1E2022;
      --accent-green: #00B4A6;
      --bg-warm: #F9F7F4;
      --white: #FFFFFF;
      --text-main: #1E2022;
      --text-secondary: #5A5D61;
      --text-muted: #B0B3B8;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 100;
      box-shadow: 0 1px 0 var(--border-light);
      transition: box-shadow 0.2s;
    }
    .desktop-nav.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 22px;
      color: var(--secondary-dark);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 10px rgba(232,69,30,0.25);
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(0,0,0,0.05);
      padding: 6px 16px env(safe-area-inset-bottom, 10px);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.04);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: var(--text-secondary);
      gap: 2px;
      font-weight: 500;
      transition: 0.2s;
    }
    .mobile-nav a i {
      font-size: 20px;
    }
    .mobile-nav a.active {
      color: var(--primary);
    }
    .mobile-nav .btn-capsule {
      background: var(--primary);
      color: white;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -18px;
      box-shadow: 0 6px 18px rgba(232,69,30,0.4);
      font-size: 22px;
    }
    /* 区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 36px;
      line-height: 1.3;
      color: var(--secondary-dark);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 680px;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(232,69,30,0.06) 0%, transparent 60%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      color: var(--secondary-dark);
      margin-bottom: 20px;
    }
    .hero .sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 6px 16px rgba(232,69,30,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 22px rgba(232,69,30,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .trust-badge {
      display: flex;
      gap: 24px;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.1);
      position: relative;
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0%{transform: translateY(0);}
      50%{transform: translateY(-12px);}
      100%{transform: translateY(0);}
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .highlight-card i {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .highlight-card h3 {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 8px;
    }
    /* 核心优势 */
    .features-row {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      align-items: start;
    }
    .feature-item {
      display: flex;
      gap: 20px;
      padding: 24px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .feature-item i {
      font-size: 24px;
      color: var(--accent-green);
      width: 40px;
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: var(--primary-soft);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }
    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .compare-col {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-light);
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--primary);
      background: #fefaf8;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s ease;
      padding: 0 28px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 0 28px 20px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(105deg, #fdf2ed 0%, #f9f7f4 100%);
      text-align: center;
      border-radius: 32px;
      margin: 0 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--secondary-dark);
      color: var(--text-muted);
      padding: 60px 0 30px;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 0.8fr 1fr 1fr;
      gap: 30px;
    }
    /* 响应式 */
    @media (max-width: 992px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      .hero-grid, .features-row { grid-template-columns: 1fr; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      section { padding: 56px 0; }
      .hero { padding: 100px 0 48px; }
      .hero h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .highlights-grid, .cases-grid { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }