/* roulang page: index */
:root {
      --primary-orange: #FF5E00;
      --deep-charcoal: #1E1E24;
      --lime-green: #C7FF3C;
      --warm-gray: #FAFAF7;
      --white: #FFFFFF;
      --soft-border: #EAEAE4;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'Inter', 'DIN Alternate', 'PingFang SC', monospace;
      --card-radius-lg: 24px;
      --card-radius-sm: 12px;
      --btn-radius: 40px;
      --shadow-sm: 0 4px 20px rgba(30,30,36,0.06);
      --shadow-hover: 0 12px 32px rgba(255,94,0,0.12);
      --spacing-section: 120px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--warm-gray);
      color: var(--deep-charcoal);
      line-height: 1.7;
      font-size: 17px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, .font-title {
      font-family: var(--font-title);
      letter-spacing: -0.02em;
    }

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

    /* 导航 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(14px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--soft-border);
      z-index: 50;
      transition: all 0.2s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .brand-logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.9rem;
      background: linear-gradient(135deg, #FF5E00 0%, #FF8C42 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-capsule {
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--deep-charcoal);
      transition: all 0.2s;
      white-space: nowrap;
    }
    .nav-capsule:hover {
      background-color: rgba(255,94,0,0.08);
    }
    .nav-capsule.active {
      background-color: rgba(255,94,0,0.15);
      color: #FF5E00;
      font-weight: 600;
    }
    .btn-primary {
      background: #FF5E00;
      color: white;
      padding: 10px 28px;
      border-radius: 40px;
      font-weight: 600;
      transition: all 0.2s ease;
      box-shadow: 0 4px 12px rgba(255,94,0,0.25);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #E55300;
      transform: scale(1.03);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 68px;
      background: #1E1E24;
      backdrop-filter: blur(20px);
      border-top-left-radius: 24px;
      border-top-right-radius: 24px;
      z-index: 55;
      justify-content: space-around;
      align-items: center;
      padding: 0 12px;
      box-shadow: 0 -8px 24px rgba(0,0,0,0.2);
    }
    .mobile-nav-item {
      color: #aaa;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      font-weight: 500;
      transition: 0.2s;
      padding: 6px 12px;
      border-radius: 40px;
    }
    .mobile-nav-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: #FF5E00;
      background: rgba(255,94,0,0.15);
    }

    /* 抽屉菜单 */
    .drawer {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: white;
      border-radius: 28px 28px 0 0;
      padding: 28px 24px 40px;
      z-index: 60;
      transform: translateY(100%);
      transition: transform 0.3s ease;
      box-shadow: 0 -12px 32px rgba(0,0,0,0.18);
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .drawer.open {
      transform: translateY(0);
    }
    .drawer a {
      font-size: 1.2rem;
      font-weight: 600;
      padding: 12px 16px;
      border-radius: 16px;
    }

    /* Hero 颗粒纹理 */
    .hero-grain {
      position: relative;
      background: linear-gradient(135deg, #FF5E00 0%, #1E1E24 60%, #FAFAF7 100%);
    }
    .hero-grain::after {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="120" height="120" viewBox="0 0 120 120"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="4" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(/%23noise)" opacity="0.06"/></svg>');
      pointer-events: none;
    }

    .data-badge {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      border-radius: 12px;
      padding: 12px 20px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-mono);
      font-size: 1.5rem;
    }

    .trend-up {
      background: #C7FF3C;
      color: #1E1E24;
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 700;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 30px rgba(255,94,0,0.15);
      border: 1px solid rgba(255,94,0,0.20);
    }

    .comparison-left {
      background: #F0F0EB;
    }
    .comparison-right {
      background: white;
      border-left: 4px solid #FF5E00;
    }

    @media (max-width: 1023px) {
      .desktop-only {
        display: none !important;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .navbar {
        display: none;
      }
      body {
        padding-bottom: 80px;
      }
      h1 {
        font-size: 2.4rem !important;
      }
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    @media (min-width: 1024px) {
      .mobile-bottom-nav, .drawer, .mobile-only {
        display: none !important;
      }
    }

    .faq-item {
      border-bottom: 1px solid #eaeaea;
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }