/* roulang page: index */
:root {
      --color-primary: #F15A24;
      --color-primary-dark: #D94A1A;
      --color-secondary: #1C1C1E;
      --color-accent: #00C2BA;
      --color-bg-warm: #F5F3F0;
      --color-border: #E5E2DE;
      --color-text: #4A4A4A;
      --color-text-muted: #6B6B6B;
      --color-white: #FFFFFF;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'Cascadia Code', monospace;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      color: var(--color-text);
      background-color: var(--color-white);
      -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-smooth);
    }

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
      background-color: transparent;
      transition: background-color 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }

    .site-header.scrolled {
      background-color: rgba(28, 28, 30, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo .brand-text {
      color: var(--color-primary);
    }

    .logo .badge {
      font-size: 12px;
      font-weight: 500;
      padding: 2px 10px;
      border: 1px solid var(--color-accent);
      color: var(--color-accent);
      border-radius: 20px;
      background: transparent;
      letter-spacing: 0.3px;
    }

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

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 15px;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--color-accent);
      transition: width var(--transition-smooth);
    }

    .nav-links a:hover {
      color: #FFFFFF;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background-color: var(--color-primary);
      color: #FFFFFF;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 10px rgba(241,90,36,0.3);
      letter-spacing: 0.3px;
      font-size: 16px;
    }

    .btn-primary:hover {
      background-color: var(--color-primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(241,90,36,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-smooth);
    }

    .btn-outline:hover {
      background-color: rgba(241,90,36,0.08);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 26px;
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(28,28,30,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 60;
    }

    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 500;
    }

    .mobile-menu .btn-primary {
      margin-top: 10px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(rgba(28,28,30,0.78), rgba(28,28,30,0.82)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }

    .hero-content {
      max-width: 680px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.5px;
      color: #FFFFFF;
    }

    .hero .highlight {
      color: var(--color-primary);
    }

    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-top: 20px;
      max-width: 540px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      margin-top: 36px;
      flex-wrap: wrap;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      opacity: 0.7;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-8px); }
      60% { transform: translateX(-50%) translateY(-4px); }
    }

    /* 区块通用 */
    .section {
      padding: 120px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 600;
      line-height: 1.3;
      color: var(--color-secondary);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--color-text-muted);
      font-size: 18px;
      margin-bottom: 56px;
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .data-card {
      background: var(--color-bg-warm);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .data-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }

    .data-icon {
      font-size: 32px;
      color: var(--color-accent);
      margin-bottom: 16px;
    }

    .data-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--color-secondary);
      line-height: 1.1;
    }

    .data-unit {
      font-size: 20px;
      color: var(--color-text-muted);
    }

    .data-label {
      font-size: 15px;
      color: var(--color-text-muted);
      margin-top: 10px;
    }

    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: white;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      transition: all var(--transition-smooth);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      border-color: var(--color-primary);
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .service-card.tall {
      padding-bottom: 56px;
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(241,90,36,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--color-primary);
      font-size: 28px;
    }

    .service-card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--color-secondary);
    }

    .tag {
      background: var(--color-accent);
      color: white;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-top: 12px;
    }

    /* 对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }

    .vs-badge {
      width: 64px;
      height: 64px;
      background: var(--color-primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 22px;
    }

    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }

    .compare-col h3 {
      font-size: 22px;
      margin-bottom: 28px;
      font-weight: 600;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }

    .text-accent {
      color: var(--color-primary);
      font-weight: 600;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--color-border);
      padding: 18px 0;
      cursor: pointer;
    }

    .faq-question {
      font-size: 20px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--color-secondary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--color-text);
      padding-right: 30px;
    }

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

    /* CTA */
    .cta-section {
      background: var(--color-primary);
      padding: 100px 0;
    }

    .cta-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 56px;
      max-width: 600px;
      margin: 0 auto;
      box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    }

    .input-field {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      font-size: 16px;
    }

    .input-field:focus {
      border-color: var(--color-primary);
    }

    /* 页脚 */
    .footer {
      background: var(--color-secondary);
      color: #A0A0A0;
      padding: 64px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }

    @media (max-width: 1024px) {
      .data-grid { grid-template-columns: repeat(2, 1fr); }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 16px auto; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 32px; }
      .service-grid { grid-template-columns: 1fr; }
      .data-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-card { padding: 32px; }
    }