.breadcrumb {
    display: flex; align-items: center; gap: 8px;
    font-size: 13px; color: var(--text-muted); margin-bottom: 20px;
  }
  .breadcrumb a { color: var(--text-muted); text-decoration: none; }
  .breadcrumb a:hover { color: var(--blue); }
  .breadcrumb-sep { color: var(--text-hint); }

  .cat-badge {
    display: inline-block; padding: 3px 10px; border-radius: 20px;
    font-size: 11px; font-weight: 800; text-transform: uppercase;
    letter-spacing: .05em; margin-bottom: 12px;
    background: #E0F7F4; color: #0D9488;
  }

  .article-header { margin-bottom: 20px; }
  .article-header h1 { font-size: 26px; font-weight: 800; line-height: 1.3; margin-bottom: 16px; }

  .article-meta {
    display: flex; align-items: center; gap: 16px;
    font-size: 13px; color: var(--text-muted); flex-wrap: wrap;
  }
  .meta-avatar {
    width: 32px; height: 32px; border-radius: 50%;
    background: #0D9488; color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 800; flex-shrink: 0;
  }
  .meta-sep { color: var(--text-hint); }

  .article-cover {
    background: linear-gradient(135deg, #134E4A 0%, #0D9488 60%, #2DD4BF 100%);
    min-height: 260px; border-radius: var(--radius-lg);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    color: #fff; text-align: center; padding: 32px; margin-bottom: 24px;
    position: relative; overflow: hidden;
  }
  .deco { position: absolute; border-radius: 50%; background: rgba(255,255,255,.06); pointer-events: none; }
  .article-cover-emoji { font-size: 64px; margin-bottom: 14px; position: relative; z-index: 1; }
  .article-cover-title { font-size: 20px; font-weight: 800; line-height: 1.3; max-width: 560px; position: relative; z-index: 1; }
  .article-cover-sub { font-size: 14px; opacity: .75; margin-top: 8px; position: relative; z-index: 1; }

  .article-body { font-size: 15px; line-height: 1.8; color: var(--text); }
  .article-body h2 { font-size: 19px; font-weight: 800; margin: 36px 0 14px; }
  .article-body h3 { font-size: 16px; font-weight: 800; margin: 24px 0 10px; }
  .article-body p { margin-bottom: 16px; }
  .article-body ul { margin-bottom: 16px; padding-left: 22px; }
  .article-body li { margin-bottom: 7px; }
  .article-body strong { font-weight: 700; }

  .article-tip {
    border-left: 4px solid var(--blue); border-radius: 0 8px 8px 0;
    padding: 14px 18px; margin: 20px 0; background: var(--blue-light);
  }
  .tip-label { font-size: 11px; font-weight: 800; text-transform: uppercase;
    color: var(--blue); margin-bottom: 5px; letter-spacing: .04em; }
  .article-tip p { margin-bottom: 0; color: var(--text); font-size: 14px; line-height: 1.6; }
  .tip-green { background: #E8F8F1; border-left-color: #18B078; }
  .tip-green .tip-label { color: #18B078; }

  .principle-cards {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 24px 0;
  }
  .principle-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 20px 16px; text-align: center; }
  .principle-icon { font-size: 32px; margin-bottom: 10px; }
  .principle-card h4 { font-size: 14px; font-weight: 800; margin-bottom: 7px; }
  .principle-card p { font-size: 13px; color: var(--text-muted); line-height: 1.5; margin: 0; }

  .steps-list { margin: 20px 0; }
  .step-row { display: flex; gap: 16px; margin-bottom: 20px; align-items: flex-start; }
  .step-badge {
    width: 36px; height: 36px; border-radius: 50%;
    background: #134E4A; color: #fff; font-size: 15px; font-weight: 800;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px;
  }
  .step-content h4 { font-size: 15px; font-weight: 800; margin-bottom: 5px; }
  .step-content p { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin: 0; }

  .pub-table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
  .pub-table th { background: var(--bg-card); padding: 10px 14px; text-align: left;
    font-size: 12px; font-weight: 800; text-transform: uppercase;
    letter-spacing: .04em; color: var(--text-muted); }
  .pub-table td { padding: 11px 14px; border-bottom: 1px solid #F0F2F5; vertical-align: top; line-height: 1.5; }
  .pub-table tr:last-child td { border-bottom: none; }
  .pub-table .moment { font-weight: 700; font-size: 13px; }

  .two-paths { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 20px 0; }
  .path-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 20px 18px; }
  .path-card h4 { font-size: 15px; font-weight: 800; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
  .path-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin: 0; }

  .code-block {
    background: #1A1D23; color: #E4E8EF; border-radius: var(--radius);
    padding: 18px 20px; font-family: 'Courier New', Courier, monospace;
    font-size: 13px; line-height: 1.75; margin: 16px 0; overflow-x: auto; white-space: pre;
  }

  /* Download buttons */
  .download-row { display: flex; gap: 10px; margin: 16px 0; flex-wrap: wrap; }
  .btn-download {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px; border-radius: 9px; font-size: 14px; font-weight: 700;
    border: 1.5px solid #0D9488; color: #0D9488; background: #E0F7F4;
    text-decoration: none; transition: background .15s;
  }
  .btn-download:hover { background: #b2ece8; }

  /* Charts */
  .charts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 20px 0; }
  .chart-wrap {
    background: #fff; border: 1px solid #E4E8EF;
    border-radius: var(--radius-lg); padding: 16px; overflow: hidden;
  }
  .chart-wrap h4 { font-size: 13px; font-weight: 800; margin-bottom: 12px; color: var(--text-muted); text-align: center; }
  .chart-wrap canvas { max-width: 100%; }

  /* Test result cards */
  .test-results { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 20px 0; }
  .test-card { background: #fff; border: 1px solid #E4E8EF; border-radius: var(--radius-lg); overflow: hidden; }
  .test-card-head { background: var(--bg-card); padding: 12px 18px;
    font-size: 13px; font-weight: 800; color: var(--text-muted); border-bottom: 1px solid #E4E8EF; }
  .test-card-body { padding: 16px 18px; }
  .test-row { display: flex; justify-content: space-between; align-items: center;
    padding: 6px 0; border-bottom: 1px solid #F5F7FA; font-size: 13px; }
  .test-row:last-child { border-bottom: none; }
  .test-label { color: var(--text-muted); }
  .test-value { font-weight: 800; }
  .test-value.pass { color: #18B078; }

  .article-divider { border: none; border-top: 1px solid #F0F2F5; margin: 36px 0; }

  .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .related-card {
    background: #fff; border: 1px solid #E4E8EF; border-radius: var(--radius-lg);
    overflow: hidden; text-decoration: none; color: inherit; transition: box-shadow .15s;
  }
  .related-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.08); }
  .related-cover { height: 90px; display: flex; align-items: center; justify-content: center; font-size: 28px; }
  .related-body { padding: 12px 14px; }
  .related-body h4 { font-size: 13px; font-weight: 700; line-height: 1.4; }

  .cta-block {
    background: linear-gradient(135deg, #134E4A 0%, #0D9488 100%);
    border-radius: var(--radius-lg); padding: 40px 32px;
    text-align: center; color: #fff; margin-bottom: 24px;
  }
  .cta-block h2 { font-size: 24px; font-weight: 800; margin-bottom: 10px; }
  .cta-block p { font-size: 15px; opacity: .85; margin-bottom: 24px; }
  .btn-white {
    background: #fff; color: #0D9488; padding: 12px 28px; border-radius: 9px;
    font-family: 'Nunito Sans', sans-serif; font-size: 15px; font-weight: 800;
    border: none; cursor: pointer; text-decoration: none; display: inline-block; transition: opacity .15s;
  }
  .btn-white:hover { opacity: .92; }

  @media (max-width: 640px) {
    .principle-cards, .two-paths, .test-results, .charts-grid, .related-grid { grid-template-columns: 1fr; }
    .article-header h1 { font-size: 20px; }
    .code-block { font-size: 12px; }
  }

  .deco-1 { width:300px; height:300px; bottom:-100px; right:-80px; }
  .deco-2 { width:160px; height:160px; top:-40px; right:60px; }
  .test-note { color:var(--text-muted); font-weight:400; }
  .related-section { margin-bottom: 24px; margin-top:36px; }
  .related-title { font-size:18px; font-weight:800; margin-bottom:16px; }
  .related-cover-blue   { background:linear-gradient(135deg,#1e3a8a,#3b82f6); }
  .related-cover-violet { background:linear-gradient(135deg,#7c3aed,#a78bfa); }
  .related-cover-amber  { background:linear-gradient(135deg,#92400e,#f59e0b); }