/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --abyss-black: #0B0C10;
      --electric-purple: #9D00FF;
      --data-cyan: #00F0FF;
      --war-gold: #FFB800;
      --text-cold-gray: #B0B8C1;
      --white-muted: rgba(255, 255, 255, 0.9);
      --border-glow: rgba(157, 0, 255, 0.25);
      --card-bg: rgba(255, 255, 255, 0.03);
      --nav-bg-opacity: rgba(11, 12, 16, 0.92);
      
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-sm: 4px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      --font-mono: 'Inter', 'Roboto', 'SF Mono', monospace;
      --transition: 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--abyss-black);
    }

    body {
      background-color: var(--abyss-black);
      color: var(--text-cold-gray);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(157, 0, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(157, 0, 255, 0.02) 1px, transparent 1px);
      background-size: 60px 60px;
    }

    a, button, input {
      font-family: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* ----- 容器与实用类 ----- */
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section-divider {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto 10px auto;
      padding: 0 24px;
    }
    .glow-line {
      height: 1px;
      background: linear-gradient(90deg, transparent 0%, var(--electric-purple) 25%, var(--data-cyan) 75%, transparent 100%);
      border: none;
    }

    /* ----- 按钮系统 ----- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      letter-spacing: 0.03em;
      text-decoration: none;
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--electric-purple);
      color: var(--abyss-black);
      border-color: var(--electric-purple);
      box-shadow: 0 0 18px rgba(157, 0, 255, 0.18);
    }
    .btn-primary:hover {
      background-color: #b023ff;
      border-color: #b023ff;
      box-shadow: 0 0 28px rgba(157, 0, 255, 0.5);
      color: #ffffff;
    }
    .btn-secondary {
      background: transparent;
      border-color: var(--data-cyan);
      color: var(--data-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.15);
    }
    .btn-secondary:hover {
      background: rgba(0, 240, 255, 0.08);
      border-color: #5cf9ff;
      box-shadow: 0 0 24px rgba(0, 240, 255, 0.45);
      color: #ffffff;
    }
    .btn-ghost {
      background: transparent;
      border-color: rgba(255, 255, 255, 0.3);
      color: #ffffff;
    }
    .btn-ghost:hover {
      border-color: #ffffff;
      background: rgba(255, 255, 255, 0.08);
    }

    /* ----- 导航 Header ----- */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      padding: 16px 0;
      transition: background 0.35s ease, backdrop-filter 0.35s ease;
      backdrop-filter: blur(12px);
    }
    #header.scrolled {
      background: var(--nav-bg-opacity);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 28px;
    }
    .logo {
      font-family: var(--font-sans);
      font-weight: 800;
      font-size: 1.75rem;
      color: #ffffff;
      letter-spacing: 0.5px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo i {
      color: var(--electric-purple);
      font-size: 1.9rem;
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-links a {
      color: #c9cdd4;
      text-decoration: none;
      font-weight: 500;
      position: relative;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-purple);
      transition: width 0.3s;
    }
    .nav-links a:hover { color: #ffffff; }
    .nav-links a:hover::after { width: 100%; }
    
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* ----- Hero 首屏 B型杂志布局 ----- */
    #hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      min-height: 100vh;
      background-image: radial-gradient(circle at 25% 30%, rgba(157,0,255,0.1) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 58px;
      font-weight: 900;
      line-height: 1.15;
      color: #ffffff;
      letter-spacing: -0.8px;
      margin-bottom: 24px;
    }
    .hero-left h1 span {
      color: var(--electric-purple);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-cold-gray);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .hero-right .dashboard-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 380px;
      width: 100%;
      border: 1px solid var(--border-glow);
      box-shadow: 0 0 40px rgba(157, 0, 255, 0.2);
      position: relative;
    }
    .float-stat {
      position: absolute;
      bottom: 20px; left: 20px;
      background: rgba(11,12,16,0.9);
      backdrop-filter: blur(12px);
      padding: 12px 18px;
      border-radius: var(--radius-md);
      font-family: var(--font-mono);
      color: var(--data-cyan);
      font-weight: 700;
      border: 1px solid var(--border-glow);
    }

    /* ----- Stats 数据光芒带 ----- */
    #stats {
      padding: 31px 0 50px;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-family: var(--font-mono);
      font-size: 2.7rem;
      font-weight: 700;
      color: var(--data-cyan);
      display: block;
    }
    .stat-label {
      color: var(--text-cold-gray);
      font-size: 0.9rem;
      letter-spacing: 1px;
    }

    /* ----- 通用板块标题 ----- */
    .section-title {
      font-size: 34px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 20px;
      display: inline-block;
      position: relative;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px; left: 0;
      width: 60%;
      height: 3px;
      background: var(--electric-purple);
    }
    .section-subtitle {
      color: var(--text-cold-gray);
      margin-bottom: 50px;
      max-width: 700px;
    }

    /* ----- Features 网格 3x2 ----- */
    #features { padding: 80px 0; }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(157, 0, 255, 0.22);
      border-radius: var(--radius-md);
      padding: 28px 18px;
      transition: all 0.28s;
    }
    .feature-card:hover {
      border-color: var(--electric-purple);
      box-shadow: 0 0 30px rgba(157, 0, 255, 0.35);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--data-cyan);
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      color: #ffffff;
      margin-bottom: 12px;
    }

    /* ----- Cases 瀑布流 ----- */
    #cases { padding: 70px 0; }
    .masonry-grid {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-glow);
      overflow: hidden;
      transition: 0.2s;
      backdrop-filter: blur(12px);
    }
    .case-card:hover {
      box-shadow: 0 0 28px rgba(157, 0, 255, 0.4);
      border-color: var(--electric-purple);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 18px;
    }
    .case-tag {
      background: var(--electric-purple);
      color: white;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-title {
      color: #fff;
      font-weight: 700;
    }

    /* ----- Comparison 对比表 ----- */
    #comparison { padding: 70px 0; }
    .comparison-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .col-plan {
      padding: 24px 22px;
      text-align: center;
      border-right: 1px solid rgba(255,255,255,0.08);
    }
    .col-plan:last-child { border-right: none; }
    .highlight-col {
      background: rgba(157,0,255,0.08);
      border: 1px solid var(--electric-purple);
    }
    .popular-badge {
      background: var(--war-gold);
      color: black;
      font-weight: bold;
      padding: 5px 14px;
      border-radius: 26px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 10px;
    }
    .price {
      font-family: var(--font-mono);
      font-size: 2rem;
      color: var(--war-gold);
    }
    .check { color: var(--data-cyan); }
    .dash { color: #5f6770; }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      cursor: pointer;
      backdrop-filter: blur(12px);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      color: #fff;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      padding: 0 24px;
      color: var(--text-cold-gray);
    }
    .faq-item.open .faq-answer {
      max-height: 180px;
      padding: 18px 24px;
    }

    /* ----- CTA & 页脚 ----- */
    #cta {
      background: radial-gradient(circle at 30% 30%, #220044, #0b0c10);
      padding: 80px 0;
      text-align: center;
    }
    .cta-title { color: #fff; font-size: 2.8rem; }
    footer {
      padding: 50px 0 24px;
      border-top: 2px solid var(--electric-purple);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 34px;
    }
    
    @media (max-width: 1024px) {
      .masonry-grid { columns: 2; }
      .comparison-table { grid-template-columns: repeat(3,1fr); overflow-x: auto; }
    }

    @media (max-width: 768px) {
      #header { background: var(--nav-bg-opacity); }
      .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left:0; width:100%; background:#0b0c10; padding:20px; }
      .nav-links.active { display: flex; }
      .mobile-toggle { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-left h1 { font-size: 42px; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .features-grid { grid-template-columns: 1fr; }
    }