/* roulang page: index */
:root {
      --primary-purple: #B620E0;
      --primary-cyan: #00E5FF;
      --accent-orange: #FF6B00;
      --bg-deep: #0A0E27;
      --card-bg: #1A1F3A;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #6B7294;
      --border-glow: rgba(0, 229, 255, 0.2);
      --radius-lg: 24px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(182, 32, 224, 0.3);
      --gradient-main: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      --font-numbers: 'Rajdhani', 'Orbitron', 'DIN Alternate', sans-serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-glow);
      transition: background 0.3s ease;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px var(--primary-cyan));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 6px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gradient-main);
      transition: width 0.25s ease;
    }

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

    .btn-nav {
      background: var(--gradient-main);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      box-shadow: 0 4px 12px rgba(182, 32, 224, 0.4);
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .btn-nav:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 229, 255, 0.5);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--primary-cyan);
      font-size: 2rem;
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      background: linear-gradient(to right, #fff, #d0d8ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a1040, var(--bg-deep) 80%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(135deg, #fff 0%, #d4e0ff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--gradient-main);
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      box-shadow: 0 6px 18px rgba(182, 32, 224, 0.5);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 10px 28px rgba(0, 229, 255, 0.6);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
    }

    .data-panel {
      background: rgba(26, 31, 58, 0.7);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-glow);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .stat-badge {
      display: flex;
      align-items: center;
      gap: 14px;
      background: rgba(0,0,0,0.4);
      padding: 12px 18px;
      border-radius: 40px;
      border-left: 4px solid var(--primary-cyan);
    }

    .stat-number {
      font-family: var(--font-numbers);
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-cyan);
    }

    /* 痛点解决方案 */
    .pain-solution {
      background: #0d1025;
    }

    .grid-2col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .pain-card, .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-glow);
    }

    .pain-card {
      border-left: 6px solid #ff4d6d;
    }

    .solution-card {
      border-left: 6px solid var(--primary-cyan);
      background: rgba(0, 229, 255, 0.03);
    }

    /* 核心优势卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: rgba(26, 31, 58, 0.8);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-glow);
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-8px);
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-hover);
    }

    .card-icon {
      font-size: 2.5rem;
      margin-bottom: 18px;
    }

    .metric {
      font-family: var(--font-numbers);
      color: var(--primary-cyan);
      font-weight: 700;
      font-size: 1.8rem;
      margin-top: 16px;
    }

    /* 数据成果 */
    .data-stats {
      background: #0b0e1f;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 24px;
    }

    .big-number {
      font-family: var(--font-numbers);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-cyan);
    }

    /* 证言 */
    .testimonials {
      background: #0d1025;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid var(--border-glow);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--card-bg);
      border-radius: 16px;
      margin-bottom: 16px;
      border: 1px solid var(--border-glow);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      color: white;
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1e1345, #0a0e27);
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #050714;
      padding: 60px 0 30px;
      border-top: 1px solid var(--border-glow);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-content, .grid-2col {
        grid-template-columns: 1fr;
      }
      .cards-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .cards-grid, .testimonial-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }