#epoch-guide-article {
      width: 95%;
      margin: 0 auto;
      padding: 2rem 1.5rem 3rem 1.5rem;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    }

    /* Hero Section */
    .epoch-guide-hero {
      text-align: center;
      margin-bottom: 2.5rem;
      padding: 2rem 1.5rem;
      background: linear-gradient(135deg, #0a0a0a 0%, #2c3e50 100%);
      border-radius: 32px;
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    }

    .epoch-guide-hero h2 {
      font-size: 2.6rem;
      font-weight: 800;
      color: white;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
      font-family: 'Playfair Display', serif;
    }

    .epoch-guide-hero .epoch-hero-sub {
      font-size: 1.2rem;
      color: rgba(255, 255, 255, 0.9);
      max-width: 720px;
      margin: 0 auto;
      line-height: 1.5;
    }

    .epoch-guide-meta {
      display: flex;
      justify-content: center;
      gap: 2rem;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      margin-top: 1.2rem;
      flex-wrap: wrap;
    }

    .epoch-guide-meta span i {
      margin-right: 0.5rem;
    }

    /* Main Content */
    .epoch-main-content {
      background: white;
      border-radius: 28px;
      padding: 2rem 2rem 2.5rem 2rem;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(0, 0, 0, 0.15);
    }

    .epoch-main-content h2 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-top: 2rem;
      margin-bottom: 1rem;
      color: #0a0a0a;
      border-left: 5px solid #2c3e50;
      padding-left: 1rem;
      font-family: 'Playfair Display', serif;
    }

    .epoch-main-content h2:first-of-type {
      margin-top: 0;
    }

    .epoch-main-content h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin: 1.5rem 0 0.75rem 0;
      color: #2c3e50;
    }

    .epoch-main-content p {
      font-size: 1.05rem;
      color: #2d3748;
      margin-bottom: 1.2rem;
      line-height: 1.6;
    }

    .epoch-main-content ul, .epoch-main-content ol {
      margin: 1rem 0 1.2rem 1.8rem;
      color: #2d3748;
      line-height: 1.6;
    }

    .epoch-main-content li {
      margin-bottom: 0.5rem;
    }

    .epoch-highlight-box {
      background: linear-gradient(135deg, rgba(0, 0, 0, 0.08), rgba(44, 62, 80, 0.05));
      border-left: 6px solid #2c3e50;
      padding: 1.25rem 1.5rem;
      border-radius: 20px;
      margin: 1.75rem 0;
    }

    .epoch-pro-tip {
      background: rgba(44, 62, 80, 0.1);
      border-radius: 20px;
      padding: 1.2rem 1.5rem;
      margin: 1.5rem 0;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      border: 1px solid rgba(0, 0, 0, 0.3);
    }

    .epoch-pro-tip i {
      font-size: 1.8rem;
      color: #0a0a0a;
    }

    .epoch-stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1.2rem;
      margin: 2rem 0;
    }

    .epoch-stat-card {
      background: #f5f7fa;
      border-radius: 20px;
      padding: 1.2rem;
      text-align: center;
      transition: all 0.2s;
      border: 1px solid rgba(0, 0, 0, 0.2);
    }

    .epoch-stat-card .stat-number {
      font-size: 2rem;
      font-weight: 800;
      color: #0a0a0a;
      margin-bottom: 0.25rem;
    }

    .epoch-quote-block {
      background: #f5f7fa;
      padding: 1.5rem;
      border-radius: 24px;
      text-align: center;
      font-style: italic;
      margin: 1.5rem 0;
      border: 1px solid rgba(0, 0, 0, 0.2);
    }

    .epoch-quote-block i {
      font-size: 2rem;
      color: #2c3e50;
      margin-bottom: 0.5rem;
      display: inline-block;
    }

    .epoch-table-wrapper {
      overflow-x: auto;
      margin: 1.5rem 0;
    }

    .epoch-conversion-table {
      width: 100%;
      border-collapse: collapse;
      background: #f5f7fa;
      border-radius: 16px;
      overflow: hidden;
    }

    .epoch-conversion-table th, .epoch-conversion-table td {
      padding: 12px 16px;
      text-align: left;
      border-bottom: 1px solid rgba(0, 0, 0, 0.2);
    }

    .epoch-conversion-table th {
      background: rgba(0, 0, 0, 0.1);
      font-weight: 600;
      color: #0a0a0a;
    }

    .epoch-conversion-table tr:hover {
      background: rgba(44, 62, 80, 0.05);
    }

    .epoch-footer-note {
      margin-top: 2.5rem;
      text-align: center;
      font-size: 0.85rem;
      color: #718096;
      border-top: 1px solid #e2e8f0;
      padding-top: 2rem;
    }

    @media (max-width: 768px) {
      .epoch-guide-hero h2 {
        font-size: 2rem;
      }
      .epoch-main-content {
        padding: 1.5rem;
      }
      #epoch-guide-article {
        padding: 1rem;
      }
    }

    /* ----- Tool styles (enhanced version) ----- */
    .epoch-tool-wrapper {
      background: #121212;
      color: #e0e0e0;
      padding: 2rem;
      border-radius: 12px;
      max-width: 1000px;
      margin: 2rem auto;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }
    .epoch-tool-wrapper * { box-sizing: border-box; }
    .epoch-tool-header {
      text-align: center;
      margin-bottom: 2.5rem;
      padding-bottom: 1.5rem;
      border-bottom: 1px solid #2a2a2a;
    }
    .epoch-tool-header h2 {
      margin: 0 0 0.5rem 0;
      font-size: 1.8rem;
      color: #ffffff;
    }
    .epoch-clock-container {
      background: #1a1a1a;
      display: inline-block;
      padding: 1rem 2rem;
      border-radius: 8px;
      border: 1px solid #333;
    }
    .epoch-clock-label {
      font-size: 0.9rem;
      color: #888;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.25rem;
    }
    .epoch-clock {
      font-size: 3rem;
      font-family: 'Courier New', Courier, monospace;
      color: #00f3ff;
      text-shadow: 0 0 15px rgba(0, 243, 255, 0.4);
      font-weight: bold;
      margin: 0;
    }
    .epoch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-bottom: 3rem;
    }
    @media (max-width: 768px) { .epoch-grid { grid-template-columns: 1fr; } }
    .epoch-panel {
      background: #1e1e1e;
      padding: 1.5rem;
      border-radius: 8px;
      border: 1px solid #333;
    }
    .epoch-panel h3 {
      margin-top: 0;
      color: #00f3ff;
      font-size: 1.3rem;
      margin-bottom: 1.5rem;
    }
    .epoch-form-group { margin-bottom: 1.25rem; }
    .epoch-label {
      display: block;
      margin-bottom: 0.5rem;
      font-size: 0.9rem;
      color: #aaa;
    }
    .epoch-input-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
    .epoch-input {
      padding: 0.75rem;
      background: #121212;
      border: 1px solid #444;
      color: #fff;
      border-radius: 4px;
      font-family: 'Courier New', Courier, monospace;
      font-size: 1rem;
      transition: all 0.2s;
    }
    .epoch-input:focus {
      outline: none;
      border-color: #00f3ff;
      box-shadow: 0 0 8px rgba(0, 243, 255, 0.2);
    }
    .epoch-input.error {
      border-color: #ff4444 !important;
      box-shadow: 0 0 8px rgba(255, 68, 68, 0.2) !important;
    }
    .epoch-select {
      padding: 0.75rem;
      background: #2a2a2a;
      border: 1px solid #444;
      color: #fff;
      border-radius: 4px;
      cursor: pointer;
    }
    .epoch-date-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.5rem;
    }
    .epoch-result-box {
      background: #121212;
      border: 1px solid #333;
      padding: 1rem;
      border-radius: 4px;
      margin-top: 1.5rem;
    }
    .epoch-result-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.5rem 0;
      border-bottom: 1px solid #222;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .epoch-result-row:last-child { border-bottom: none; }
    .epoch-result-label {
      color: #888;
      font-size: 0.85rem;
      width: 80px;
    }
    .epoch-result-value {
      font-family: 'Courier New', Courier, monospace;
      color: #fff;
      flex: 1;
      word-break: break-all;
    }
    .epoch-btn {
      background: transparent;
      border: 1px solid #00f3ff;
      color: #00f3ff;
      padding: 0.4rem 0.8rem;
      border-radius: 4px;
      cursor: pointer;
      font-size: 0.8rem;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .epoch-btn:hover { background: rgba(0, 243, 255, 0.1); }
    .epoch-btn-primary {
      background: #00f3ff;
      color: #121212;
      border: none;
      padding: 0.75rem 1.5rem;
      font-weight: bold;
      width: 100%;
      margin-top: 1rem;
      font-size: 1rem;
      cursor: pointer;
    }
    .epoch-btn-primary:hover { background: #00c3cc; }
    .epoch-error-msg {
      color: #ff4444;
      font-size: 0.85rem;
      margin-top: 0.5rem;
      display: none;
    }