/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-hover: #072E23;
      --accent: #FF6B2B;
      --accent-light: rgba(255, 107, 43, 0.1);
      --bg-warm: #F5F3EF;
      --bg-dark: #0C1F1A;
      --bg-footer: #0A1F19;
      --bg-copyright: #061210;
      --card-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5C6B6A;
      --text-on-dark: #E8EDEB;
      --text-muted-dark: #B0BFBA;
      --success: #00A86B;
      --alert: #E03C31;
      --border-light: #E0DDD8;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 30px rgba(10,61,46,0.12);
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-container: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 1000;
      background: rgba(10,61,46,0);
      backdrop-filter: blur(0px);
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s;
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      background: rgba(10,61,46,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .logo i {
      font-size: 20px;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: #fff;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      left: 50%;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease, left 0.2s ease;
      border-radius: 1px;
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .btn-nav {
      background: var(--accent);
      color: #fff;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      margin-left: 8px;
    }
    .btn-nav:hover {
      background: #e85d1f;
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--primary);
      backdrop-filter: blur(16px);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.3s ease;
      z-index: 1100;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      color: #fff;
      font-size: 18px;
      font-weight: 500;
    }
    .mobile-close {
      align-self: flex-end;
      background: transparent;
      border: none;
      color: #fff;
      font-size: 28px;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background-color: var(--bg-dark);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: #fff;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(12,31,26,0.7);
      backdrop-filter: blur(1px);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .hero h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      max-width: 700px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 12px 30px;
      border-radius: var(--radius-button);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-outline:hover {
      background: var(--accent-light);
      transform: translateY(-2px);
    }
    .live-ticker {
      position: absolute;
      bottom: 20px;
      left: 0;
      width: 100%;
      background: rgba(0,0,0,0.55);
      backdrop-filter: blur(8px);
      padding: 10px 0;
      white-space: nowrap;
      overflow: hidden;
      color: #ddd;
      font-size: 14px;
      z-index: 2;
    }
    .ticker-content {
      display: inline-block;
      animation: scrollTicker 25s linear infinite;
      padding-left: 100%;
    }
    @keyframes scrollTicker {
      0% { transform: translateX(0); }
      100% { transform: translateX(-100%); }
    }
    /* 指标看板 */
    .stats-section {
      padding: 90px 0;
      background: var(--bg-warm);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: box-shadow 0.3s, transform 0.2s;
    }
    .stat-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 服务矩阵 */
    .services {
      padding: 90px 0;
      background: #fff;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text-main);
    }
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 24px;
      max-width: 1100px;
      margin: 0 auto;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      transition: transform 0.3s, box-shadow 0.3s, border 0.2s;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 28px rgba(10,61,46,0.15);
      border-color: var(--accent);
    }
    .service-icon {
      font-size: 42px;
      color: var(--accent);
      flex-shrink: 0;
    }
    .service-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-text p {
      color: var(--text-secondary);
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag {
      background: #e6f4ef;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }
    /* 对比 */
    .comparison {
      background: var(--bg-dark);
      padding: 90px 0;
      color: #fff;
    }
    .comparison .section-title {
      color: #fff;
    }
    .compare-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .compare-col {
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-container);
      padding: 32px;
    }
    .compare-col h3 {
      font-size: 22px;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 16px;
    }
    .old-item { color: #b0bfba; }
    .new-item { color: #fff; }
    .icon-fail { color: var(--alert); }
    .icon-success { color: var(--success); }
    /* FAQ */
    .faq {
      padding: 90px 0;
      background: var(--bg-warm);
    }
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      padding: 90px 0;
      text-align: center;
      color: #fff;
    }
    .cta-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-sub {
      color: var(--accent);
      font-size: 20px;
      margin-bottom: 36px;
    }
    .download-buttons {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 30px;
    }
    .btn-store {
      background: #fff;
      color: #1a1a1a;
      padding: 14px 28px;
      border-radius: 12px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 10px;
      transition: transform 0.2s;
    }
    .btn-store:hover { transform: translateY(-3px); }
    .email-form {
      display: flex;
      justify-content: center;
      gap: 12px;
      flex-wrap: wrap;
    }
    .email-form input {
      padding: 12px 18px;
      border-radius: 8px;
      border: none;
      width: 240px;
    }
    /* 页脚 */
    .footer {
      background: var(--bg-footer);
      color: var(--text-muted-dark);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      font-size: 15px;
    }
    .copyright {
      background: var(--bg-copyright);
      text-align: center;
      padding: 16px;
      font-size: 13px;
    }
    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 32px; }
      .compare-panel { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
    }