/* roulang page: index */
:root {
      --primary-deep: #0B1E33;
      --accent-green: #00E5A0;
      --accent-orange: #FF6A3D;
      --bg-light: #F5F7FA;
      --text-primary: #1A1A2E;
      --text-secondary: #5B6778;
      --text-on-dark: #FFFFFF;
      --border-light: #E2E8F0;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 30px rgba(0,229,160,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-title: 'PingFang SC', 'HarmonyOS Sans', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'HarmonyOS Sans', 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', 'Roboto', system-ui;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 { font-size: clamp(2.25rem, 5vw, 3rem); }
    h2 { font-size: clamp(1.75rem, 4vw, 2rem); }
    h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); font-weight: 600; }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 1023px) {
      .section-padding { padding: 60px 0; }
    }
    @media (max-width: 767px) {
      .section-padding { padding: 48px 0; }
      .container { padding: 0 16px; }
    }

    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226,232,240,0.6);
      transition: background 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      text-decoration: none;
    }
    .logo i { color: var(--accent-green); font-size: 1.8rem; }
    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }
    .nav-chip {
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      transition: all 0.2s ease;
      background: transparent;
    }
    .nav-chip:hover, .nav-chip.active {
      background: rgba(0,229,160,0.12);
      color: var(--accent-green);
    }
    .cta-btn {
      background: var(--accent-green);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.2s ease;
      box-shadow: 0 2px 8px rgba(0,229,160,0.2);
      margin-left: 12px;
    }
    .cta-btn:hover {
      filter: brightness(1.1);
      box-shadow: 0 4px 14px rgba(0,229,160,0.3);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(20px);
      border-top: 1px solid var(--border-light);
      justify-content: space-around;
      padding: 8px 0 12px;
      z-index: 50;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.75rem;
      color: var(--text-secondary);
      text-decoration: none;
      gap: 4px;
    }
    .mobile-nav a i { font-size: 1.4rem; }
    .mobile-nav a.active { color: var(--accent-green); }
    .floating-cta {
      display: none;
      position: fixed;
      bottom: 80px;
      right: 20px;
      background: var(--accent-orange);
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 20px rgba(255,106,61,0.3);
      z-index: 55;
      font-size: 1.4rem;
    }

    @media (max-width: 767px) {
      .desktop-nav { display: none; }
      .mobile-nav, .floating-cta { display: flex; }
      .nav-container { justify-content: center; }
      .logo { font-size: 1.3rem; }
    }

    /* Hero指标动画 */
    @keyframes pulse {
      0% { opacity: 0.9; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.02); }
      100% { opacity: 0.9; transform: scale(1); }
    }
    .pulse-data {
      animation: pulse 2.2s infinite ease-in-out;
    }
    /* 卡片系统 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 28px 24px;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      border-top: 3px solid var(--accent-green);
      transform: translateY(-2px);
    }
    .data-card {
      background: #F8FAFC;
      border-left: 4px solid var(--accent-green);
      padding: 24px;
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
    }
    /* 对比卡片 */
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
    }
    .compare-card.recommend {
      border: 1px solid var(--accent-green);
      box-shadow: 0 0 0 1px rgba(0,229,160,0.2);
    }
    .badge-recommend {
      background: var(--accent-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      cursor: pointer;
      color: var(--text-primary);
      transition: color 0.2s;
    }
    .faq-question:hover { color: var(--accent-green); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F8FAFC;
      border-left: 3px solid var(--accent-green);
      padding: 0 20px;
      margin-bottom: 8px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }
    .faq-item.open .faq-question { color: var(--accent-green); }
    /* 表单 */
    .input-field {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      background: white;
      font-size: 1rem;
      transition: border 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--accent-green);
      box-shadow: 0 0 0 2px rgba(0,229,160,0.15);
    }
    .btn-submit {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s;
    }
    .btn-submit:hover { background: #E55A2F; }
    /* 装饰线条 */
    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 16px;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 40px;
      height: 3px;
      background: var(--accent-green);
    }
    footer a { color: #CBD5E1; text-decoration: none; }
    footer a:hover { color: var(--accent-green); }