/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent-red: #FF4655;
      --accent-gold: #FFD700;
      --bg-light: #F5F6FA;
      --card-bg: #FFFFFF;
      --text-dark: #1a1a1a;
      --text-body: #333333;
      --text-muted: rgba(255,255,255,0.7);
      --border-light: #e8ecf1;
      --shadow-card: 0 8px 30px rgba(10,14,39,0.06);
      --shadow-hover: 0 16px 40px rgba(10,14,39,0.12);
      --radius-lg: 16px;
      --radius-md: 8px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-body);
      background-color: #fff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--primary);
    }
    h1 {
      font-size: 48px;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.1;
      color: #ffffff;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--accent-gold);
      border-radius: 2px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    p {
      font-size: 16px;
      line-height: 1.7;
      color: #555;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 16px;
      padding: 12px 28px;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      border-color: var(--accent-red);
      box-shadow: 0 4px 12px rgba(255,70,85,0.3);
    }
    .btn-primary:hover {
      background: #E63443;
      border-color: #E63443;
      box-shadow: 0 6px 18px rgba(255,70,85,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(10,14,39,0.05);
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.8);
      color: white;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
    }
    .btn-white {
      background: white;
      color: var(--accent-red);
      border-color: white;
      font-weight: 700;
    }
    .btn-white:hover {
      background: var(--accent-gold);
      border-color: var(--accent-gold);
      color: var(--primary);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: white;
      z-index: 1000;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: box-shadow 0.3s;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      color: var(--accent-gold);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: #333;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-red);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 30px;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(255,215,0,0.08) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin: 20px 0 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: rgba(255,215,0,0.15);
      backdrop-filter: blur(8px);
      border-radius: 12px;
      padding: 16px 20px;
      text-align: center;
      border: 1px solid rgba(255,215,0,0.3);
    }
    .badge-number {
      font-size: 30px;
      font-weight: 800;
      color: var(--accent-gold);
    }
    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 360px;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    @media (max-width: 768px) {
      .hero {
        padding: 120px 0 60px;
      }
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-badges {
        justify-content: center;
      }
      .hero-visual {
        margin-top: 40px;
      }
    }

    section {
      padding: 100px 0;
    }
    .section-title {
      margin-bottom: 48px;
    }
    .bg-light {
      background: var(--bg-light);
    }

    /* 核心优势 1+2 布局 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-left: 4px solid var(--accent-red);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-main {
      grid-row: span 2;
    }
    .adv-icon {
      font-size: 32px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    .feature-group {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-text {
      flex: 1;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .feature-list li::before {
      content: '◆';
      color: var(--accent-gold);
      font-size: 14px;
    }
    .feature-image {
      flex: 1;
    }
    @media (max-width: 768px) {
      .feature-group {
        flex-direction: column;
      }
    }

    .scenario-cards {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .scenario-tag {
      background: #eee;
      color: #333;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .scenario-card:hover .scenario-tag {
      background: var(--accent-red);
      color: white;
    }
    @media (max-width: 768px) {
      .scenario-cards {
        grid-template-columns: 1fr;
      }
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .pricing-card.featured {
      border-top: 5px solid var(--accent-gold);
      transform: scale(1.03);
      box-shadow: 0 20px 40px rgba(255,215,0,0.2);
    }
    .price {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f9f9fb;
      border-radius: 8px;
      margin-top: 12px;
      padding: 0 20px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px;
    }

    .cta-banner {
      background: linear-gradient(135deg, #FF4655 0%, #FFD700 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .footer {
      background: #0A0E27;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }