/* roulang page: index */
:root {
      --primary: #1B5E3B;
      --primary-dark: #154A2E;
      --accent: #E8A838;
      --accent-light: #F0B84C;
      --bg-warm: #F5F3EF;
      --bg-dark: #1E2B24;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-on-dark: #F5F3EF;
      --success: #2D8C4A;
      --danger: #C44536;
      --border-light: #E8E5E0;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 2px 8px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.04);
      --shadow-nav: 0 1px 0 rgba(0,0,0,0.05), 0 2px 8px rgba(0,0,0,0.04);
      --shadow-btn: 0 2px 8px rgba(27,94,59,0.25);
      --shadow-btn-hover: 0 4px 16px rgba(27,94,59,0.35);
      --shadow-glow: 0 0 20px rgba(232,168,56,0.3);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-round: 50%;
      --transition-base: 250ms ease-out;
      --transition-fast: 200ms ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Mono", "Menlo", monospace;
      --container-max: 1120px;
      --nav-height-desktop: 64px;
      --nav-height-mobile: 56px;
      --section-gap-desktop: 100px;
      --section-gap-tablet: 72px;
      --section-gap-mobile: 56px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-fast);
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height-desktop);
      display: flex;
      align-items: center;
      background: transparent;
      transition: background var(--transition-fast), box-shadow var(--transition-fast);
    }
    .nav.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 16px;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition-fast);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent);
      color: #1A1A1A;
      padding: 8px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition-fast), box-shadow var(--transition-fast);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--accent-light);
      box-shadow: var(--shadow-glow);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: var(--transition-fast);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height-mobile);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-nav);
        gap: 16px;
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav {
        height: var(--nav-height-mobile);
      }
      .nav-inner {
        padding: 0 16px;
      }
    }
    /* Hero */
    .hero {
      padding-top: calc(var(--nav-height-desktop) + 40px);
      padding-bottom: 60px;
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(27,94,59,0.03) 0%, transparent 60%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.1;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition-fast);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--accent);
      color: #1A1A1A;
      box-shadow: var(--shadow-btn);
    }
    .btn-primary:hover {
      background: var(--accent-light);
      box-shadow: var(--shadow-btn-hover);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
    }
    .btn-secondary:hover {
      background: rgba(27,94,59,0.08);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 420px;
      box-shadow: var(--shadow-card-hover);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-content h1 {
        font-size: 36px;
      }
      .hero-image {
        height: 300px;
      }
    }
    @media (max-width: 640px) {
      .hero {
        padding-top: calc(var(--nav-height-mobile) + 24px);
        min-height: auto;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .hero-content .subtitle {
        font-size: 16px;
      }
      .btn {
        padding: 12px 24px;
      }
    }
    /* 通用板块标题 */
    .section-title {
      font-size: 30px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.25;
    }
    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 48px;
    }
    @media (max-width: 640px) {
      .section-title {
        font-size: 22px;
      }
    }
    /* 指标看板 */
    .stats-section {
      background: var(--bg-dark);
      padding: 80px 0;
      margin-top: var(--section-gap-desktop);
      color: var(--text-on-dark);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: rgba(255,255,255,0.06);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
      backdrop-filter: blur(4px);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .stat-label {
      margin-top: 8px;
      font-size: 14px;
      color: rgba(245,243,239,0.75);
    }
    @media (max-width: 1024px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
      .stat-number {
        font-size: 36px;
      }
    }
    .stats-note {
      margin-top: 24px;
      font-size: 13px;
      color: rgba(245,243,239,0.5);
    }
    /* 服务矩阵 */
    .services-section {
      padding: var(--section-gap-desktop) 0;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border: 1px solid rgba(27,94,59,0.15);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(27,94,59,0.1);
      border-radius: var(--radius-round);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--primary);
      font-size: 22px;
    }
    .service-card h3 {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .service-card p {
      color: var(--text-body);
      margin-bottom: 20px;
      flex: 1;
    }
    .btn-sm {
      padding: 8px 18px;
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据对比 */
    .compare-section {
      padding: var(--section-gap-desktop) 0;
      background: #fff;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-col {
      background: var(--bg-warm);
      border-radius: var(--radius-md);
      padding: 32px;
    }
    .compare-col.highlight {
      border-left: 4px solid var(--primary);
      background: white;
      box-shadow: var(--shadow-card);
    }
    .compare-col h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-size: 15px;
    }
    .icon-check {
      color: var(--success);
      font-weight: 700;
    }
    .icon-cross {
      color: var(--danger);
    }
    .compare-cta {
      margin-top: 32px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 下载CTA插页 */
    .download-cta {
      background: var(--bg-dark);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .download-cta h2 {
      font-size: 30px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .download-cta p {
      color: rgba(245,243,239,0.8);
      margin-bottom: 32px;
    }
    .pulse-btn {
      display: inline-block;
      background: var(--accent);
      color: #1A1A1A;
      padding: 16px 40px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 18px;
      animation: pulse 2s 3 ease-in-out;
      box-shadow: var(--shadow-glow);
      transition: background var(--transition-fast);
    }
    .pulse-btn:hover {
      background: var(--accent-light);
    }
    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }
    .platform-icons {
      display: flex;
      gap: 20px;
      justify-content: center;
      margin-top: 24px;
    }
    .platform-badge {
      background: rgba(255,255,255,0.1);
      padding: 10px 24px;
      border-radius: 40px;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* FAQ */
    .faq-section {
      padding: var(--section-gap-desktop) 0;
      max-width: 760px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
      color: var(--text-main);
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-arrow {
      transition: transform 350ms ease;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 350ms ease-in-out;
      color: var(--text-body);
      font-size: 15px;
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-top: 12px;
    }
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }
    /* Footer */
    .footer {
      background: var(--bg-dark);
      color: rgba(245,243,239,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer h4 {
      color: white;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .footer a {
      color: rgba(245,243,239,0.7);
      display: block;
      margin-bottom: 8px;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 13px;
      color: rgba(245,243,239,0.4);
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.8s ease, transform 0.8s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }