/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #0A4D3C;
      --primary-light: #1B6B55;
      --accent: #F57C00;
      --accent-dark: #E65100;
      --bg: #F7F8FA;
      --surface: #FFFFFF;
      --text: #1E2A2A;
      --text-muted: #5A6A6A;
      --border: #E8ECF0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Courier New", monospace;
      --max-width: 1280px;
      --nav-height: 72px;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      display: flex;
      align-items: center;
    }
    .header-shadow {
      border-bottom-color: var(--border);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo svg {
      width: 36px;
      height: 36px;
      fill: none;
      stroke: var(--primary);
      stroke-width: 2;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a:focus-visible::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary);
        flex-direction: column;
        padding: 100px 32px 40px;
        gap: 28px;
        transition: right 0.4s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.25);
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        color: white;
        font-size: 18px;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A4D3C 0%, #1B6B55 100%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 480px;
      color: white;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text .sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      color: #e0f0e8;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent), var(--accent-dark));
      color: white;
      border: none;
      padding: 14px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 18px rgba(245,124,0,0.5);
      transform: translateY(-2px);
    }
    .login-card {
      flex: 0 0 380px;
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      padding: 36px 28px;
      border: 1px solid rgba(255,255,255,0.25);
      color: white;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      animation: float 3s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      100% { transform: translateY(-8px); }
    }
    .login-card h2 {
      font-size: 24px;
      margin-bottom: 24px;
      font-weight: 700;
    }
    .input-group {
      margin-bottom: 16px;
    }
    .input-group input {
      width: 100%;
      height: 52px;
      border-radius: 14px;
      border: 1px solid rgba(255,255,255,0.5);
      background: rgba(255,255,255,0.15);
      padding: 0 18px;
      color: white;
      font-size: 16px;
      backdrop-filter: blur(8px);
      transition: var(--transition);
    }
    .input-group input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(245,124,0,0.4);
      background: rgba(255,255,255,0.25);
    }
    .login-btn {
      width: 100%;
      margin-top: 8px;
    }
    .ticker {
      margin-top: 32px;
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 8px;
      color: rgba(255,255,255,0.9);
      font-family: var(--font-mono);
    }
    .ticker-item {
      white-space: nowrap;
      background: rgba(255,255,255,0.1);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .login-card {
        flex: 1 1 auto;
        width: 100%;
        max-width: 400px;
      }
    }
    /* 数据看板 */
    .dashboard-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
      margin-top: 32px;
    }
    .stat-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 28px 32px;
      width: 240px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 20px;
      transition: var(--transition);
    }
    .stat-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .stat-icon {
      width: 52px;
      height: 52px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 24px;
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .stat-card {
        width: 100%;
      }
    }
    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
    }
    .service-icon {
      font-size: 44px;
      color: var(--primary);
      margin-bottom: 20px;
      transition: var(--transition);
    }
    .service-card:hover .service-icon {
      color: var(--accent);
    }
    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .comparison-row {
      display: flex;
      gap: 32px;
      margin-top: 40px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      border-radius: 24px;
      padding: 40px 32px;
      list-style: none;
    }
    .compare-bad {
      background: #FFF0F0;
      border: 1px solid #ffcdd2;
    }
    .compare-good {
      background: #F0FFF4;
      border: 1px solid #c8e6c9;
    }
    .compare-card li {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
      font-size: 16px;
    }
    @media (max-width: 768px) {
      .comparison-row {
        flex-direction: column;
      }
    }
    .cta-center {
      text-align: center;
      margin-top: 32px;
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 32px;
    }
    .faq-item {
      background: #FAFBFC;
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 20px 24px;
      cursor: pointer;
      transition: var(--transition);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      margin-top: 0;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    /* 联系表单 */
    .contact-card {
      max-width: 480px;
      margin: 0 auto;
      background: var(--surface);
      border-radius: 28px;
      padding: 48px 36px;
      box-shadow: 0 18px 40px rgba(0,0,0,0.08);
      background: linear-gradient(white, #f9fafb);
    }
    .contact-card input {
      width: 100%;
      height: 52px;
      border: 1px solid #DDE2E8;
      border-radius: 14px;
      padding: 0 20px;
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .contact-card input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,77,60,0.2);
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 24px;
      color: var(--text-muted);
      font-size: 13px;
    }
    /* 页脚 */
    .site-footer {
      background: #1E2A2A;
      color: #B0B8B8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-brand h4 {
      color: white;
      font-size: 20px;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      color: #B0B8B8;
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }