/* roulang page: index */
:root {
      --deep-purple: #0D0B1E;
      --dark-purple: #1A172B;
      --electric-gold: #F0C040;
      --neon-cyan: #00F0FF;
      --white-soft: rgba(255,255,255,0.7);
      --white-muted: rgba(255,255,255,0.5);
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --glass-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --gold-glow: 0 0 20px rgba(240,192,64,0.5);
      --cyan-glow: 0 0 15px rgba(0,240,255,0.6);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --transition-main: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-purple);
      color: #fff;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 20% 10%, rgba(240,192,64,0.08) 0%, transparent 35%);
      background-attachment: fixed;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 排版基础 */
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.01em;
    }
    h1 {
      font-size: 56px;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 40px;
      line-height: 1.3;
    }
    h3 {
      font-size: 24px;
      line-height: 1.4;
    }
    p {
      color: var(--white-soft);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-main);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition-main);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .navbar.scrolled {
      background: rgba(13, 11, 30, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 1px 0 rgba(0,240,255,0.2);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--electric-gold), #FFD966);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0D0B1E;
      font-weight: bold;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      padding: 8px 0;
      position: relative;
      letter-spacing: 0.5px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width 0.3s;
    }
    .nav-menu a:hover {
      color: var(--electric-gold);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: #fff;
      transition: 0.3s;
      border-radius: 2px;
    }
    .mobile-panel {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(13,11,30,0.96);
      backdrop-filter: blur(24px);
      z-index: 999;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
    }
    .mobile-panel.active {
      display: flex;
    }
    .mobile-panel a {
      font-size: 24px;
      color: #fff;
      font-weight: 500;
    }
    /* 通用板块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(140, 80, 220, 0.35) 0%, rgba(13,11,30,0.85) 80%);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .hero-text h1 .gold {
      color: var(--electric-gold);
      text-shadow: 0 0 15px rgba(240,192,64,0.6);
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
    }
    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #F0C040, #DAA520);
      color: #0D0B1E;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      box-shadow: 0 0 20px rgba(240,192,64,0.5);
      transition: 0.3s;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(240,192,64,0.8);
      transform: scale(1.05);
    }
    .btn-outline {
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .hero-image {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
      position: relative;
    }
    /* 不对称栅格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .feature-large, .feature-small {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: blur(20px);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--glass-shadow);
      transition: 0.3s;
    }
    .feature-large:hover, .feature-small:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.6);
    }
    .feature-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    /* 横向滚动卡片 */
    .scroll-cards {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .scroll-card {
      min-width: 260px;
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      backdrop-filter: blur(20px);
      border-radius: 16px;
      padding: 28px;
      scroll-snap-align: start;
      transition: 0.3s;
    }
    .scroll-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 0 28px rgba(0,240,255,0.3);
    }
    @media (min-width: 1024px) {
      .scroll-cards {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        overflow: visible;
      }
    }
    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img img {
      border-radius: 16px;
    }
    /* 数据指标 */
    .stats-band {
      background: #0A0816;
      padding: 60px 0;
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
    }
    .stat-digit {
      font-size: 48px;
      font-weight: 700;
      color: var(--electric-gold);
    }
    /* 会员卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 40px;
    }
    .pricing-card.popular {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.5);
    }
    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 12px;
      margin-bottom: 12px;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .hero .container { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .pricing-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
    }
    @media (min-width: 769px) and (max-width: 1024px) {
      .pricing-grid { grid-template-columns: 1fr 1fr; }
    }