/* roulang page: index */
:root {
      --primary: #0D4A40;
      --primary-dark: #08332C;
      --accent: #FF6F4C;
      --accent-hover: #E05A3A;
      --bg: #F7F5F2;
      --white: #FFFFFF;
      --text: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-muted: #8A8A8A;
      --success: #2D9B6A;
      --border: #D9D9D9;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-stack: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
      --section-gap: 80px;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      color: var(--accent);
      text-decoration: none;
      transition: color 0.2s, text-decoration 0.2s;
    }
    a:hover {
      color: var(--accent-hover);
      text-decoration: underline;
    }

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

    button, .button {
      font-family: var(--font-stack);
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      font-weight: 600;
      border: none;
      outline: none;
      text-decoration: none;
      line-height: 1.2;
    }

    h1, h2, h3 {
      font-weight: 600;
      color: var(--text);
      margin-bottom: 0.5rem;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
    }

    h2 {
      font-size: 32px;
      line-height: 1.25;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }

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

    /* ---------- 导航栏 ---------- */
    #header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      height: 64px;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      transition: background 0.3s, box-shadow 0.3s;
    }

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

    .nav-left {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .logo::before {
      content: '';
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--accent);
      transform: rotate(45deg);
      border-radius: 2px;
    }
    .logo:hover {
      text-decoration: none;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      text-decoration: none;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
      text-decoration: none;
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 1.25rem;
    }

    .search-icon {
      font-size: 18px;
      color: var(--text-secondary);
      cursor: default;
      opacity: 0.8;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(255,111,76,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      color: white;
      text-decoration: none;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      text-decoration: none;
    }

    .mobile-menu-icon {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text);
    }

    /* ---------- Hero ---------- */
    #hero {
      padding-top: 64px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: var(--bg);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      width: 100%;
    }

    .hero-left {
      flex: 0 0 45%;
    }
    .hero-left h1 {
      margin-bottom: 1.25rem;
    }
    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-right {
      flex: 0 0 55%;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 420px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-right::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(13,74,64,0.85) 0%, rgba(13,74,64,0.3) 100%);
    }
    .data-cards {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      justify-content: center;
      padding: 20px;
    }
    .data-item {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(4px);
      border-radius: 12px;
      padding: 16px 20px;
      text-align: center;
      min-width: 120px;
      box-shadow: var(--shadow-sm);
    }
    .data-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
      display: block;
    }
    .data-label {
      font-size: 13px;
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      overflow: hidden;
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    /* 优势非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
      margin-top: 2rem;
    }
    .adv-card {
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .adv-icon {
      width: 40px;
      height: 40px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2z"/></svg>') center/contain no-repeat;
      background: var(--accent);
      mask-size: cover;
      display: inline-block;
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .service-img {
      height: 180px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }
    .service-content {
      padding: 20px 24px 24px;
    }

    /* 对比 */
    .comparison-panel {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .vs-col {
      flex: 1;
      background: white;
      border-radius: 16px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .vs-divider {
      font-weight: 700;
      font-size: 24px;
      color: var(--accent);
    }
    .progress-wrap {
      margin: 18px 0;
    }

    /* FAQ */
    .accordion-title {
      font-weight: 600;
      font-size: 17px;
      background: white;
      border-bottom: 1px solid #E5E5E5;
      padding: 16px 0;
      cursor: pointer;
    }
    .accordion-content {
      padding: 16px 0;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-block {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 70px 24px;
      border-radius: 24px;
    }

    /* 表单 */
    .contact-form {
      background: var(--bg);
      max-width: 600px;
      margin: 0 auto;
    }
    .input-style {
      border: 1px solid var(--border);
      border-radius: var(--radius-input);
      padding: 14px;
      width: 100%;
      font-size: 16px;
      transition: 0.2s;
    }
    .input-style:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(255,111,76,0.2);
      outline: none;
    }

    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 48px 0 24px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: 1 1 auto; width: 100%; }
      .advantages-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 640px) {
      .nav-links, .nav-right .btn-primary { display: none; }
      .mobile-menu-icon { display: block; }
      .advantages-grid, .services-grid { grid-template-columns: 1fr; }
      .comparison-panel { flex-direction: column; }
    }