/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --cyan: #00F0FF;
      --neon-pink: #FF3366;
      --card-bg: rgba(26, 31, 58, 0.8);
      --text-light: #F5F5FF;
      --text-muted: #8A8FAE;
      --border-subtle: rgba(0, 240, 255, 0.15);
      --cyan-glow: 0 0 25px rgba(0, 240, 255, 0.6);
      --radius-md: 16px;
      --radius-sm: 6px;
      --radius-pill: 30px;
      --gap-section: 100px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "DIN Alternate", sans-serif;
      --max-width: 1200px;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: #B0B5D0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 50% 0%, rgba(0,240,255,0.08) 0%, transparent 60%);
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      color: #fff;
      line-height: 1.4;
      margin-bottom: 8px;
    }
    a { text-decoration: none; color: var(--cyan); transition: color 0.2s; }
    img { max-width: 100%; display: block; }

    /* 按钮样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 0 28px;
      height: 48px;
      transition: all 0.3s ease;
      cursor: pointer;
      font-size: 16px;
      border: 1px solid transparent;
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A0E27;
      border: none;
      box-shadow: 0 4px 15px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      box-shadow: var(--cyan-glow);
      transform: translateY(-2px);
      background: #2afff5;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.12);
      box-shadow: 0 0 18px rgba(0,240,255,0.4);
    }
    .btn-pink {
      background: var(--neon-pink);
      color: #fff;
      border: none;
      box-shadow: 0 0 20px rgba(255,51,102,0.55);
    }
    .btn-pink:hover {
      box-shadow: 0 0 30px rgba(255,51,102,0.8);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 999;
      padding: 0 20px;
      height: 70px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 800;
      color: var(--cyan);
      background: linear-gradient(135deg, #00F0FF 0%, #7B68EE 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-icon { font-size: 28px; filter: drop-shadow(0 0 6px cyan); }
    .nav-links { display: flex; gap: 28px; align-items: center; }
    .nav-links a {
      color: #ccd0e0;
      font-size: 15px;
      font-weight: 500;
      letter-spacing: 1px;
      position: relative;
      padding: 5px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover { color: var(--cyan); }
    .nav-links a:hover::after { width: 100%; }
    .mobile-menu-toggle { display: none; background: none; border: none; color: var(--cyan); font-size: 26px; }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 15px;
      left: 50%;
      transform: translateX(-50%);
      width: 95%;
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-subtle);
      border-radius: 40px;
      padding: 6px 12px;
      justify-content: space-around;
      z-index: 1000;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 70px;
      overflow: hidden;
      background: radial-gradient(ellipse at 20% 50%, #0b1029 0%, #0A0E27 70%);
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: soft-light;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
      margin-top: -20px;
    }
    .hero h1 {
      font-size: 52px;
      line-height: 1.2;
      font-weight: 800;
      background: linear-gradient(to right, #00F0FF, #9b8aff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 30px rgba(0,240,255,0.3);
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: #bfc5e0;
      margin-bottom: 36px;
    }
    .hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
    .floating-stats {
      position: absolute;
      right: 40px;
      top: 30%;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-subtle);
      border-radius: 24px;
      padding: 28px;
      color: white;
      display: flex;
      flex-direction: column;
      gap: 24px;
      z-index: 2;
    }
    .stat-digit { font-family: var(--font-mono); font-size: 38px; font-weight: 700; color: var(--cyan); }

    /* 通用卡片与栅格 */
    .section-padding { padding: 100px 0; }
    .three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .card-glow {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .card-glow:hover {
      border-color: var(--cyan);
      box-shadow: inset 0 0 20px rgba(0,240,255,0.25);
      transform: translateY(-5px);
    }
    .icon-cyan { font-size: 40px; color: var(--cyan); margin-bottom: 20px; }

    /* 功能分组不对称布局 */
    .features-grid {
      display: grid;
      grid-template-columns: 260px 1fr;
      gap: 32px;
    }
    .tab-selector { display: flex; flex-direction: column; gap: 8px; }
    .tab-btn {
      background: rgba(26,31,58,0.7);
      border: 1px solid transparent;
      color: #ccd0e0;
      padding: 14px 20px;
      border-radius: 12px;
      text-align: left;
      font-weight: 500;
      cursor: pointer;
      transition: 0.2s;
    }
    .tab-btn.active, .tab-btn:hover {
      border-color: var(--cyan);
      background: rgba(0,240,255,0.08);
      color: white;
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    .tab-panel { display: none; }
    .tab-panel.active { display: block; }

    .price-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: 24px;
      padding: 36px 24px;
      position: relative;
    }
    .price-highlight {
      border-color: var(--neon-pink);
      box-shadow: 0 0 30px rgba(255,51,102,0.4);
    }
    .faq-item { border-bottom: 1px solid rgba(255,255,255,0.08); }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: white;
      font-size: 18px;
      padding: 22px 8px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 8px; color: #b0b5d0; }

    footer {
      background: #070b1c;
      padding: 60px 0 25px;
      border-top: 1px solid rgba(0,240,255,0.1);
    }

    @media (max-width: 1024px) {
      .three-col { grid-template-columns: repeat(2, 1fr); }
      .features-grid { grid-template-columns: 1fr; }
      .floating-stats { display: none; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .mobile-nav { display: flex; }
      .hero h1 { font-size: 36px; }
      .three-col { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
    }