/* roulang page: index */
/* 设计变量 */
    :root {
      --bg-deep: #0A0E17;
      --bg-card: #1E1E1E;
      --bg-dark-card: #161B22;
      --border-subtle: #2A2A2A;
      --border-input: #30363D;
      --accent-green: #00E676;
      --accent-green-hover: #69F0AE;
      --accent-orange: #FF5722;
      --text-primary: #E0E0E0;
      --text-secondary: #9E9E9E;
      --text-white: #FFFFFF;
      --radius-sm: 4px;
      --radius-md: 6px;
      --transition: 0.2s ease;
      --container-width: 1280px;
      --space-section: 80px;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeSpeed;
      background-image: radial-gradient(circle at 30% 40%, rgba(0, 230, 118, 0.02) 0%, transparent 30%);
      position: relative;
      isolation: isolate;
    }

    /* 网站信息Portugal */
    body::after {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0 L30 60 M0 30 L60 30' stroke='%23FFFFFF' stroke-opacity='0.03' stroke-width='1' /%3E%3C/svg%3E");
      pointer-events: none;
      z-index: -1;
      opacity: 0.4;
    }

    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 标题字体规范 */
    h1, h2, h3, .card-title, .data-big {
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    .en-number {
      font-family: 'Inter', monospace;
      font-weight: 600;
      font-feature-settings: "tnum";
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--accent-green);
      z-index: 100;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--accent-green);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-green);
      border-bottom-color: var(--accent-green);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: var(--accent-green);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 板块通用间距 */
    section {
      padding: var(--space-section) 0;
    }
    .section-title {
      font-size: 2rem;
      margin-bottom: 1.2rem;
      color: var(--text-white);
      border-left: 4px solid var(--accent-green);
      padding-left: 18px;
      margin-bottom: 3rem;
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      min-height: 85vh;
      padding-top: 60px;
    }
    .hero-left h1 {
      font-size: 3rem;
      line-height: 1.3;
      color: white;
      margin-bottom: 1rem;
    }
    .hero-left .green-highlight {
      color: var(--accent-green);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .live-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: rgba(0,230,118,0.08);
      border: 1px solid var(--accent-green);
      padding: 10px 18px;
      border-radius: 2px;
      margin-bottom: 2rem;
      font-size: 1rem;
    }
    .live-dot {
      background: #FF5722;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      animation: pulse 1.4s infinite;
    }
    @keyframes pulse { 0%{opacity:1; transform:scale(1);} 50%{opacity:0.6; transform:scale(0.9);} }
    .btn-group { display: flex; gap: 16px; flex-wrap: wrap; }
    .btn-primary {
      background: var(--accent-green);
      color: #0A0E17;
      font-weight: 700;
      padding: 14px 28px;
      text-decoration: none;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: 0.25s;
      border: none;
      cursor: pointer;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover { background: #69F0AE; }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-green);
      color: var(--accent-green);
      font-weight: 600;
      padding: 14px 26px;
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: 0.25s;
    }
    .btn-outline:hover { background: rgba(0,230,118,0.1); }
    .hero-right {
      background: rgba(15,20,30,0.7);
      border: 1px solid #2A2A2A;
      border-radius: 8px;
      padding: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 320px;
    }

    /* 数据波纹可视化 */
    .heatmap-visual {
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(0,230,118,0.25) 0%, transparent 50%),
                  repeating-linear-gradient(45deg, rgba(0,230,118,0.05) 0px, rgba(0,230,118,0.05) 2px, transparent 2px, transparent 8px);
      position: relative;
    }

    /* Features 网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: all 0.2s;
    }
    .feature-card:hover {
      border-color: var(--accent-green);
      background: #2A2A2A;
      box-shadow: 0 0 0 2px var(--accent-green);
    }
    .feature-icon { font-size: 2rem; color: var(--accent-green); margin-bottom: 1rem; }
    .feature-card h3 { color: white; margin-bottom: 0.5rem; }

    /* 数据看板 */
    .data-console {
      background: #0D1117;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-sm);
      overflow-x: auto;
      padding: 1.5rem;
    }
    .compare-table { width: 100%; border-collapse: collapse; color: #c9d1d9; }
    .compare-table th { text-align: left; padding: 12px; background: #161B22; }
    .compare-table td { padding: 14px; border-bottom: 1px solid #30363D; }
    .green-row { background: rgba(0,230,118,0.08); }
    .progress-bg { background: #424242; height: 8px; border-radius: 4px; width: 100%; }
    .progress-fill { background: var(--accent-green); height: 8px; border-radius: 4px; width: 95%; }

    /* 案例卡片 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 22px;
    }
    .case-card {
      background: #1A1E26;
      border:1px solid #2A2A2A;
      border-radius: var(--radius-sm);
      overflow: hidden;
      transform: rotate(0.5deg);
      transition: 0.2s;
    }
    .case-card:nth-child(even){ transform: rotate(-0.3deg); }
    .case-card:hover { border-color: var(--accent-green); transform: scale(1.01); }
    .case-img { width: 100%; height: 150px; object-fit: cover; filter: brightness(0.7); }
    .case-info { padding: 1rem; }
    .case-score { font-size: 1.4rem; font-weight: 700; color: white; }

    /* FAQ */
    .faq-list { max-width: 800px; }
    .faq-item {
      background: var(--bg-card);
      border-left: 4px solid var(--accent-green);
      margin-bottom: 12px;
      padding: 1rem 1.5rem;
      transition: 0.2s;
    }
    .faq-question { font-weight: 600; display: flex; justify-content: space-between; cursor: pointer; color: white; }
    .faq-answer { margin-top: 0.8rem; color: var(--text-secondary); display: none; }
    .faq-item.open .faq-answer { display: block; }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(180deg, #0A0E17 0%, #1E1E1E 100%);
      text-align: center;
      padding: 4rem 1rem;
    }

    /* 页脚 */
    .site-footer {
      background: #000;
      color: #757575;
      padding: 2rem 0;
      border-top: 1px solid #1f1f1f;
    }
    .footer-flex { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
      .hero-right { min-height: 250px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-left h1 { font-size: 2.2rem; }
      .features-grid { grid-template-columns: 1fr; }
    }