/* roulang page: index */
:root {
      --primary-red: #E43D2A;
      --primary-red-dark: #C5301C;
      --deep-black: #1A1A2E;
      --warm-white: #F5F0E8;
      --energy-gold: #FFB800;
      --success-green: #2E8B57;
      --text-dark: #1A1A2E;
      --text-body: #3D3D4A;
      --text-muted: #6B6B78;
      --text-light: #D1D1D6;
      --border-light: #E5E5EA;
      --shadow-card: 0 4px 20px rgba(26, 26, 46, 0.08);
      --shadow-card-hover: 0 8px 30px rgba(228, 61, 42, 0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-img: 4px;
      --spacing-section: 80px;
      --max-width: 1200px;
      --nav-height: 72px;
      --nav-height-mobile: 56px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-img);
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: all 0.25s ease;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-dark);
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    .section {
      padding: var(--spacing-section) 0;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(26, 26, 46, 0.85);
      backdrop-filter: blur(8px);
      z-index: 1000;
      transition: background 0.3s ease;
      display: flex;
      align-items: center;
    }

    .navbar.scrolled {
      background: var(--deep-black);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 800;
      color: white;
      letter-spacing: 1px;
    }

    .logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary-red);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      color: var(--warm-white);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-red);
      transition: width 0.25s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .nav-link.active {
      color: var(--energy-gold);
    }

    .nav-cta {
      background: var(--primary-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 16px;
    }

    .nav-cta:hover {
      background: var(--primary-red-dark);
      transform: scale(1.03);
    }

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

    .hamburger span {
      display: block;
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* Hero 区域 */
    .hero {
      background: var(--deep-black);
      color: white;
      padding: 120px 0 80px;
      margin-top: 0;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -10%;
      right: -5%;
      width: 50%;
      height: 120%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, black 40%, transparent 90%);
      z-index: 0;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 1;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .hero h1 span {
      color: var(--primary-red);
    }

    .hero p {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
    }

    .btn-primary:hover {
      background: var(--primary-red-dark);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-red);
      color: var(--primary-red);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

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

    .hero-image {
      flex: 0 0 480px;
      height: 400px;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border-bottom: 3px solid transparent;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      border-bottom-color: var(--primary-red);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
      color: var(--primary-red);
    }

    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    /* 服务体系 */
    .service-row {
      display: flex;
      gap: 32px;
      align-items: center;
      margin-bottom: 48px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .service-row:nth-child(even) {
      background: var(--warm-white);
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      min-height: 280px;
      background-size: cover;
      background-position: center;
    }

    .service-text {
      flex: 1;
      padding: 40px;
    }

    .badge {
      display: inline-block;
      background: rgba(228, 61, 42, 0.1);
      color: var(--primary-red);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .check-list {
      list-style: none;
      margin-top: 16px;
    }

    .check-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--success-green);
      font-weight: 500;
      margin-bottom: 8px;
    }

    /* 数据区 */
    .stats-section {
      background: var(--deep-black);
      color: white;
      text-align: center;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--energy-gold);
      display: block;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: url('/assets/images/backpic/back-3.webp') center/cover;
      margin-bottom: 16px;
    }

    .testimonial-quote {
      font-style: italic;
      font-size: 1.1rem;
      margin-bottom: 16px;
      line-height: 1.8;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      padding-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-red);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 600px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-form input {
      padding: 14px 20px;
      border-radius: var(--radius-btn);
      border: none;
      flex: 1;
      min-width: 200px;
    }

    .btn-gold {
      background: var(--energy-gold);
      color: var(--deep-black);
      padding: 14px 40px;
      font-weight: 700;
      border-radius: var(--radius-btn);
    }

    .btn-gold:hover {
      background: #e6a800;
    }

    /* Footer */
    .footer {
      background: var(--deep-black);
      color: var(--text-light);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer a:hover {
      color: var(--energy-gold);
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonials-grid { grid-template-columns: 1fr 1fr; }
      .hero .container { flex-direction: column; }
      .hero-image { width: 100%; height: 300px; flex: auto; }
    }

    @media (max-width: 768px) {
      :root { --spacing-section: 60px; }
      .nav-menu { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100vh; background: var(--deep-black); flex-direction: column; justify-content: center; gap: 40px; }
      .nav-menu.active { display: flex; }
      .hamburger { display: flex; z-index: 1001; }
      .features-grid, .stats-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .service-row, .service-row:nth-child(even) { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2.2rem; }
    }