/* roulang page: index */
:root {
      --primary: #7B2FBE;
      --primary-light: #9B4FDE;
      --accent: #00F0B5;
      --bg-deep: #0A0A0F;
      --bg-card: #1A1A24;
      --bg-divider: #2A2A35;
      --text-white: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #707080;
      --warning: #FF6B35;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-nav: 40px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
      --shadow-hover: 0 12px 32px rgba(123,47,190,0.25);
      --spacing-section: 100px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Serif SC', 'Georgia', 'Times New Roman', serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    h1, h2, h3, h4, .nav-title, .cta-btn, .btn {
      font-family: 'Noto Sans SC', 'Helvetica Neue', 'Arial', sans-serif;
      font-weight: 700;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .container-main {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 1100px;
      background: rgba(10,10,15,0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-bottom: 1px solid var(--accent);
      border-radius: var(--radius-nav);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .dock-nav.scrolled {
      background: rgba(10,10,15,0.95);
      box-shadow: 0 8px 30px rgba(0,0,0,0.7);
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-white);
      font-size: 1.2rem;
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    .logo-icon i {
      color: var(--accent);
      font-size: 1.6rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .nav-cta-btn {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .nav-cta-btn:hover {
      background: var(--primary-light);
      box-shadow: 0 0 20px rgba(123,47,190,0.6);
    }
    .mobile-menu-btn {
      display: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* Hero双栏 */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1A1025 0%, #0A0A0F 90%);
      position: relative;
      overflow: hidden;
    }
    .particles-bg {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
      z-index: 0;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 1;
      width: 100%;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-right img {
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .hero-title {
      color: white;
      font-size: 2.8rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      color: #B0B0C0;
      font-size: 1.2rem;
      margin-bottom: 32px;
      max-width: 90%;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover {
      background: var(--primary-light);
      box-shadow: 0 0 20px rgba(123,47,190,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,181,0.1);
      color: white;
    }
    /* 板块通用 */
    .section-block {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      font-size: 2rem;
      color: white;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--primary);
      margin-top: 8px;
    }
    /* 优势网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, box-shadow 0.2s;
      border-top: 3px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-top-color: var(--accent);
    }
    .feature-icon {
      color: var(--accent);
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .feature-card h4 {
      color: white;
      font-size: 1.2rem;
      margin-bottom: 8px;
    }
    /* 数据瀑布流 */
    .data-waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 40px;
    }
    .data-col {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }
    .data-col.offset {
      margin-top: 40px;
    }
    .data-card {
      background: var(--bg-divider);
      padding: 24px;
      border-radius: var(--radius-card);
      border-left: 4px solid var(--primary);
    }
    .big-number {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.1;
    }
    /* 方案对比 */
    .plan-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .plan-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: transform 0.2s, box-shadow 0.2s;
      border: 2px solid transparent;
    }
    .plan-card.featured {
      border-color: var(--accent);
      transform: translateY(-10px);
      box-shadow: 0 0 24px rgba(0,240,181,0.3);
    }
    .plan-badge {
      background: var(--warning);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* FAQ */
    .accordion-item {
      background: var(--bg-card);
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .accordion-title {
      background: transparent;
      color: white;
      padding: 18px 24px;
      font-weight: 600;
      border: none;
      width: 100%;
      text-align: left;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      background: rgba(123,47,190,0.05);
      padding: 0 24px 18px;
      color: #B0B0C0;
    }
    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A0A0F, #3A1B5A);
      padding: 80px 0;
      text-align: center;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: 0 0 100%; }
      .hero-right { order: -1; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .feature-grid { grid-template-columns: 1fr; }
      .data-waterfall { grid-template-columns: 1fr; }
      .data-col.offset { margin-top: 0; }
      .plan-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-title { font-size: 2rem; }
    }