/* roulang page: index */
/* :root 设计变量 */
    :root {
      --deep-purple: #1E0A3C;
      --nebula-blue: #0F2B5B;
      --neon-orange: #FF4D2E;
      --victory-gold: #F0B90B;
      --card-bg: rgba(15, 43, 91, 0.6);
      --card-border: rgba(240, 185, 11, 0.25);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C7E0;
      --text-muted: #7A8FA6;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(255, 77, 46, 0.6);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    body {
      font-family: var(--font-sans);
      background: radial-gradient(ellipse at 30% 20%, #1E0A3C 0%, #0A1120 85%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-attachment: fixed;
      position: relative;
    }

    /* 星空纹理背景（CSS生成） */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(2px 2px at 15px 60px, #ffffff, rgba(0,0,0,0)),
                        radial-gradient(2px 2px at 85px 220px, #ffffff, rgba(0,0,0,0)),
                        radial-gradient(1px 1px at 230px 90px, #F0B90B, rgba(0,0,0,0)),
                        radial-gradient(2px 2px at 320px 400px, #ffffff, rgba(0,0,0,0)),
                        radial-gradient(1px 1px at 550px 150px, #FF4D2E, rgba(0,0,0,0)),
                        radial-gradient(2px 2px at 780px 300px, #F0B90B, rgba(0,0,0,0)),
                        radial-gradient(1px 1px at 900px 80px, #ffffff, rgba(0,0,0,0));
      background-size: 1000px 600px;
      opacity: 0.2;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 1;
    }

    /* 导航 PC */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(15, 43, 91, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(240, 185, 11, 0.2);
      z-index: 100;
      transition: background var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo i {
      color: var(--victory-gold);
      font-size: 1.8rem;
      filter: drop-shadow(0 0 6px rgba(240,185,11,0.5));
    }
    .nav-menu {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }
    .nav-menu a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--victory-gold);
      transition: width var(--transition);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--victory-gold);
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 43, 91, 0.95);
      backdrop-filter: blur(30px);
      border-radius: 24px 24px 0 0;
      padding: 10px 20px;
      z-index: 110;
      box-shadow: 0 -8px 30px rgba(0,0,0,0.6);
    }
    .mobile-nav-inner {
      display: flex;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      transition: color var(--transition);
      text-decoration: none;
    }
    .mobile-nav-item i {
      font-size: 1.4rem;
      margin-bottom: 4px;
    }
    .mobile-nav-item.active {
      color: var(--neon-orange);
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
      scroll-margin-top: 70px;
    }

    h2 {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 1rem;
      background: linear-gradient(135deg, var(--victory-gold), var(--neon-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* Hero双栏 */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      min-height: 85vh;
      padding-top: 80px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #F0B90B, #FF4D2E);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2.2rem;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      margin-bottom: 2.8rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, #FF4D2E, #FF6B4A);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      color: white;
      cursor: pointer;
      transition: all var(--transition);
      box-shadow: 0 4px 14px rgba(255,77,46,0.4);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: var(--shadow-glow);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--victory-gold);
      color: var(--victory-gold);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--neon-orange);
      color: var(--neon-orange);
      box-shadow: 0 0 15px rgba(255,77,46,0.3);
    }
    .badge-row {
      display: flex;
      gap: 1.5rem;
      flex-wrap: wrap;
    }
    .data-badge {
      background: rgba(240,185,11,0.15);
      border: 1px solid rgba(240,185,11,0.5);
      border-radius: 30px;
      padding: 6px 18px;
      font-size: 0.9rem;
      color: var(--victory-gold);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-right img {
      width: 100%;
      border-radius: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
      border: 1px solid rgba(240,185,11,0.25);
    }

    /* 核心优势 不对称网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all var(--transition);
    }
    .adv-card:hover {
      border-color: var(--victory-gold);
      box-shadow: 0 10px 35px rgba(0,0,0,0.6);
    }
    .adv-large {
      grid-row: span 2;
    }
    .adv-icon {
      font-size: 2rem;
      color: var(--neon-orange);
      margin-bottom: 1rem;
    }
    .adv-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    .micro-badge {
      background: rgba(240,185,11,0.2);
      color: var(--victory-gold);
      padding: 2px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-top: 1rem;
    }

    /* 生态案例瀑布流 */
    .masonry-grid {
      columns: 3;
      column-gap: 24px;
    }
    .eco-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-lg);
      border: 1px solid var(--card-border);
      margin-bottom: 24px;
      overflow: hidden;
      transition: all var(--transition);
      break-inside: avoid;
    }
    .eco-card:hover {
      border-color: var(--victory-gold);
      transform: translateY(-4px);
    }
    .eco-card img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
    }
    .eco-card:hover img {
      transform: scale(1.04);
    }
    .eco-text {
      padding: 1.4rem;
    }
    .eco-text h3 {
      font-size: 1.3rem;
      margin-bottom: 0.5rem;
    }
    .eco-link {
      color: var(--victory-gold);
      text-decoration: none;
      font-weight: 500;
    }

    /* 对比卡片 */
    .compare-row {
      display: flex;
      gap: 24px;
    }
    .compare-card {
      flex: 1;
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .compare-recommend {
      border: 1px solid var(--victory-gold);
      background: rgba(240,185,11,0.08);
      position: relative;
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--neon-orange);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 1.2rem 0;
    }

    /* FAQ */
    details {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      margin-bottom: 12px;
      padding: 0 1.5rem;
    }
    summary {
      padding: 1.2rem 0;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }
    .answer {
      padding-bottom: 1.5rem;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 20% 40%, #1E0A3C, #0A1120);
      border-radius: 32px;
      padding: 60px;
      text-align: center;
    }
    .input-field {
      background: rgba(0,0,0,0.5);
      border: 1px solid var(--victory-gold);
      padding: 12px 16px;
      border-radius: 10px;
      color: white;
      width: 100%;
      margin: 0.6rem 0;
    }

    footer {
      background: #050A14;
      padding: 30px;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .masonry-grid { columns: 2; }
    }
    @media (max-width: 768px) {
      .site-header { display: none; }
      .mobile-nav { display: block; }
      .hero-title { font-size: 2.5rem; }
      .advantages-grid { grid-template-columns: 1fr; }
      .compare-row { flex-direction: column; }
      .masonry-grid { columns: 1; }
    }