/* roulang page: index */
:root {
      --primary-bg: #1A1A1A;
      --secondary-bg: #2A2A2A;
      --footer-bg: #111111;
      --neon-cyan: #00E5FF;
      --neon-purple: #D500F9;
      --text-white: #FFFFFF;
      --text-light-gray: #B0B0B0;
      --border-light: rgba(255, 255, 255, 0.1);
      --card-shadow: 0 4px 15px rgba(0,0,0,0.3);
      --card-hover-shadow: 0 12px 28px rgba(0,0,0,0.5);
      --border-radius-card: 8px;
      --border-radius-btn: 4px;
      --transition-default: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--primary-bg);
      color: var(--text-light-gray);
      line-height: 1.8;
      font-size: 1rem;
      font-weight: 400;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      padding: 1rem 0;
    }
    
    .site-header.scrolled {
      background: rgba(26, 26, 26, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 15px rgba(0,0,0,0.4);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .logo-icon {
      font-size: 2rem;
      color: var(--neon-cyan);
      transform: rotate(15deg);
    }
    
    .logo-text {
      font-size: 1.75rem;
      font-weight: 900;
      letter-spacing: -0.02em;
      color: var(--text-white);
      text-transform: uppercase;
    }
    
    .main-nav {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .main-nav a {
      color: var(--text-light-gray);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.02em;
      position: relative;
      padding: 0.25rem 0;
    }
    
    .main-nav a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      transition: width 0.25s ease;
    }
    
    .main-nav a:hover::after,
    .main-nav a.active::after {
      width: 100%;
    }
    
    .main-nav a:hover {
      color: var(--text-white);
    }
    
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-block;
      padding: 0.8rem 2rem;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      letter-spacing: 0.03em;
      transition: var(--transition-default);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
    }
    
    .btn-primary {
      background: var(--neon-cyan);
      color: #0A0A0A;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    
    .btn-primary:hover {
      background: #33EAFF;
      box-shadow: 0 0 22px rgba(0,229,255,0.7);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--neon-cyan);
      border-color: var(--neon-cyan);
    }
    
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 15px rgba(0,229,255,0.3);
      transform: translateY(-2px);
    }
    
    .btn-purple {
      background: var(--neon-purple);
      color: white;
      border-color: var(--neon-purple);
      box-shadow: 0 0 12px rgba(213,0,249,0.4);
    }
    
    .btn-purple:hover {
      background: #E033FF;
      box-shadow: 0 0 22px rgba(213,0,249,0.7);
      transform: translateY(-2px);
    }
    
    /* 板块通用 */
    .section {
      padding: 6rem 0;
    }
    
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--text-white);
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 70px;
      height: 4px;
      background: var(--neon-cyan);
      border-radius: 2px;
    }
    
    .section-desc {
      font-size: 1.15rem;
      color: var(--text-light-gray);
      max-width: 700px;
      margin-bottom: 2.5rem;
    }
    
    /* Hero */
    .hero {
      padding: 9rem 0 5rem;
      background: radial-gradient(circle at 20% 40%, #222, #0A0A0A);
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    
    .hero-left {
      flex: 1;
    }
    
    .hero-right {
      flex: 1;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.6);
    }
    
    .hero-right img {
      width: 100%;
      height: 420px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    
    .hero-right:hover img {
      transform: scale(1.05);
    }
    
    .hero-title {
      font-size: 3.5rem;
      font-weight: 900;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--text-white);
      margin-bottom: 1.5rem;
    }
    
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-light-gray);
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }
    
    .hero-actions {
      display: flex;
      gap: 1.25rem;
      flex-wrap: wrap;
    }
    
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    
    .feature-card {
      background: var(--secondary-bg);
      border-radius: var(--border-radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition-default);
      border: 1px solid transparent;
    }
    
    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      border-color: var(--neon-cyan);
      transform: translateY(-5px);
    }
    
    .feature-icon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
      margin-bottom: 1.25rem;
    }
    
    .feature-stat {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--neon-purple);
      margin-bottom: 0.25rem;
    }
    
    .feature-list {
      list-style: none;
      padding: 0;
    }
    
    .feature-list li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: flex-start;
      gap: 0.6rem;
      color: #ddd;
    }
    
    .feature-list li i {
      color: var(--neon-cyan);
      margin-top: 0.2rem;
    }
    
    /* 案例瀑布流 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      grid-auto-rows: auto;
    }
    
    .case-card {
      background: var(--secondary-bg);
      border-radius: var(--border-radius-card);
      overflow: hidden;
      transition: var(--transition-default);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }
    
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    
    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    
    .case-info {
      padding: 1.25rem;
    }
    
    .case-tag {
      color: var(--neon-cyan);
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
    }
    
    /* 对比区 */
    .compare-wrapper {
      display: flex;
      align-items: stretch;
      gap: 2rem;
      margin-top: 2rem;
    }
    
    .compare-col {
      flex: 1;
      background: var(--secondary-bg);
      border-radius: var(--border-radius-card);
      padding: 2rem;
    }
    
    .vs-badge {
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 2rem;
      color: var(--neon-purple);
      background: #1e1e1e;
      border-radius: 50%;
      width: 70px;
      height: 70px;
      box-shadow: 0 0 15px rgba(213,0,249,0.5);
    }
    
    /* FAQ */
    .accordion-faq {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      background: var(--secondary-bg);
      border-radius: 6px;
      margin-bottom: 1rem;
      overflow: hidden;
    }
    
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      color: var(--text-white);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: 0.2s;
    }
    
    .faq-question.active {
      color: var(--neon-cyan);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 1.8rem;
      color: #ccc;
    }
    
    .faq-answer.open {
      max-height: 300px;
      padding-bottom: 1.5rem;
    }
    
    /* CTA */
    .cta-section {
      background: #0E0E0E;
      text-align: center;
    }
    
    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      text-align: center;
      color: #888;
    }
    
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.8rem; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 768px) {
      .main-nav { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr; }
      .masonry-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }