/* roulang page: index */
:root {
      --deep-space: #0b0c10;
      --cosmic-purple: #1a0a2e;
      --mid-blue: #16213e;
      --ocean-blue: #0f3460;
      --starlight-gold: #f5c518;
      --gold-dark: #e0a800;
      --nebula-cyan: #00d2ff;
      --cyan-glow: #0ef6cc;
      --text-primary: #e0e0e0;
      --text-white: #ffffff;
      --text-muted: #9ca3af;
      --card-bg: rgba(20, 30, 60, 0.5);
      --card-border: rgba(255,255,255,0.08);
      --glass-blur: blur(12px);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 16px 48px rgba(0,0,0,0.6);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --font-heading: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --transition-smooth: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-white);
      letter-spacing: -0.02em;
    }
    
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.8rem);
      font-weight: 700;
      line-height: 1.15;
      margin-bottom: 1.5rem;
    }
    
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.6rem);
      font-weight: 600;
      line-height: 1.25;
      margin-bottom: 2rem;
    }
    
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    
    h4 {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-white);
    }
    
    a {
      color: var(--nebula-cyan);
      transition: var(--transition-smooth);
      text-decoration: none;
    }
    
    a:hover {
      color: var(--starlight-gold);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航系统 */
    .xingkong-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10,14,23,0.9);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(245,197,24,0.15);
      transition: all 0.3s ease;
    }
    
    .nav-brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 24px;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    
    .logo {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .logo i {
      color: var(--starlight-gold);
      font-size: 2rem;
    }
    
    .search-trend {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    
    .trend-tags {
      display: flex;
      gap: 16px;
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 500;
    }
    
    .trend-tags span {
      cursor: default;
      transition: color 0.2s;
    }
    
    .trend-tags span:hover {
      color: var(--starlight-gold);
    }
    
    .nav-channels {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 32px;
      padding: 10px 24px;
      flex-wrap: wrap;
    }
    
    .nav-channels a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding-bottom: 6px;
      transition: color 0.2s;
    }
    
    .nav-channels a.active {
      color: var(--starlight-gold);
    }
    
    .nav-channels a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--starlight-gold);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-white);
      cursor: pointer;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .search-trend, .nav-channels {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-brand-row {
        padding: 16px 20px;
      }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: rgba(10,14,23,0.98);
        backdrop-filter: blur(20px);
        padding: 24px;
        gap: 20px;
        border-top: 1px solid rgba(255,255,255,0.1);
      }
      .mobile-menu.open {
        display: flex;
      }
      .mobile-menu a {
        color: var(--text-white);
        font-size: 1.2rem;
      }
      .mobile-trend {
        display: flex;
        gap: 16px;
        color: var(--text-muted);
      }
    }
    
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 20% 30%, #1a0a2e, #0b0c10 80%);
      padding-top: 120px;
      padding-bottom: 80px;
      overflow: hidden;
    }
    
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    
    .hero-text {
      flex: 1 1 500px;
    }
    
    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 0 30px rgba(0,210,255,0.2);
      border: 1px solid rgba(255,255,255,0.1);
    }
    
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 24px;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, var(--starlight-gold), var(--gold-dark));
      color: #1a0a2e;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s ease;
      border: none;
      font-size: 1rem;
      box-shadow: 0 4px 15px rgba(245,197,24,0.25);
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(245,197,24,0.6);
      transform: translateY(-2px);
      color: #1a0a2e;
    }
    
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--nebula-cyan);
      color: var(--nebula-cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s ease;
      font-size: 1rem;
    }
    
    .btn-secondary:hover {
      background: rgba(0,210,255,0.1);
      border-color: var(--starlight-gold);
      color: var(--starlight-gold);
    }
    
    /* 板块通用 */
    .section {
      padding: 120px 0;
    }
    
    @media (max-width: 768px) {
      .section {
        padding: 80px 0;
      }
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 16px;
    }
    
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      font-size: 1.2rem;
      max-width: 700px;
      margin: 0 auto 60px;
    }
    
    /* 卡片系统 */
    .card-glass {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: all 0.3s ease;
    }
    
    .card-glass:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(245,197,24,0.3);
    }
    
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
    }
    
    .badge-num {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--starlight-gold);
      font-family: var(--font-heading);
    }
    
    .feature-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    
    .feature-text {
      flex: 1 1 400px;
    }
    
    .feature-img {
      flex: 1 1 400px;
    }
    
    .feature-img img {
      border-radius: var(--radius-lg);
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    
    .scene-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    
    @media (max-width: 1024px) {
      .scene-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    @media (max-width: 768px) {
      .scene-grid {
        grid-template-columns: 1fr;
      }
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }
    
    .accordion-item {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid rgba(255,255,255,0.05);
    }
    
    .accordion-title {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-white);
    }
    
    .accordion-content {
      padding: 0 24px 20px;
      color: #b0b8c4;
      display: none;
    }
    
    .accordion-item.active .accordion-content {
      display: block;
    }
    
    .accordion-item.active .accordion-title i {
      color: var(--starlight-gold);
      transform: rotate(45deg);
    }
    
    .cta-section {
      background: linear-gradient(135deg, #1a0a2e, #0f3460);
      border-radius: var(--radius-lg);
      padding: 80px 40px;
      text-align: center;
      margin: 0 24px;
    }
    
    .footer {
      background: #0a0e17;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(245,197,24,0.3);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 16px;
      color: var(--text-muted);
      transition: color 0.2s;
    }
    
    .social-icons i:hover {
      color: var(--starlight-gold);
    }