.content-page{background:#fff;max-width:900px;min-height:100vh;margin:0 auto;padding:20px}.content-page h1{color:#667eea;margin-bottom:20px;font-size:2.5em}.content-page h2{color:#764ba2;margin-top:30px;margin-bottom:15px;font-size:1.8em}.content-page h3{color:#667eea;margin-top:25px;margin-bottom:10px;font-size:1.4em}.content-page p{color:#333;margin-bottom:15px;font-size:1.1em;line-height:1.8}.content-page ul,.content-page ol{margin:15px 0 15px 30px;line-height:1.8}.content-page li{color:#333;margin-bottom:10px}.content-link{color:#667eea;font-weight:700}.content-eyebrow{color:#0f766e;letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;font-weight:800}.content-action{color:#fff;background:#0f766e;border-radius:6px;justify-content:center;align-items:center;min-height:42px;margin-right:12px;padding:9px 14px;font-weight:800;text-decoration:none;display:inline-flex}.breadcrumb-list{margin-bottom:18px}.breadcrumb-list ol{flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none;display:flex}.breadcrumb-list li{color:#64748b;align-items:center;gap:6px;margin:0;font-size:.9rem;font-weight:700;display:inline-flex}.breadcrumb-list li:not(:last-child):after{color:#94a3b8;content:"/"}.breadcrumb-list a{color:#0f766e;text-decoration:none}.breadcrumb-list a:hover,.breadcrumb-list a:focus{color:#115e59;text-decoration:underline}.seo-link-cluster{background:#f8fafc;border:1px solid #dbeafe;border-radius:8px;gap:16px;margin:28px 0 0;padding:20px;display:grid}.seo-link-cluster-header{gap:6px;display:grid}.seo-link-cluster-header h2,.seo-link-cluster-header p{margin:0}.seo-link-cluster-header p{color:#475569;font-size:1rem}.seo-link-cluster-grid{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px;display:grid}.seo-link-cluster-grid a{color:#0f172a;background:#fff;border:1px solid #cbd5e1;border-radius:7px;gap:5px;min-width:0;padding:14px;text-decoration:none;display:grid}.seo-link-cluster-grid a:hover,.seo-link-cluster-grid a:focus{border-color:#0f766e;outline:none;box-shadow:0 8px 22px #0f766e1f}.seo-link-cluster-grid strong{color:#0f766e;font-size:.98rem}.seo-link-cluster-grid span{color:#475569;font-size:.9rem;line-height:1.45}.technique-box,.strategy-card,.feature-box,.faq-item,.contact-box{background:#f8f9fa;border-left:4px solid #667eea;border-radius:5px;margin:20px 0;padding:20px}.article-list{gap:18px;display:grid}.article-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;gap:10px;padding:20px;display:grid}.article-card h2,.article-card p{margin:0}.article-card-meta{color:#64748b;font-size:.85rem;font-weight:700}.article-detail{gap:22px;display:grid}.article-detail header{gap:8px;display:grid}.article-detail header h1,.article-detail header p{margin:0}.article-body{color:#1f2937;font-size:1.08rem;line-height:1.85}.article-body p{margin:0 0 1.35rem}.article-visuals{gap:20px;margin:26px 0;display:grid}.article-visual{background:#fff;border:1px solid #e2e8f0;border-radius:14px;gap:12px;margin:0;padding:16px;display:grid;box-shadow:0 8px 24px #0f172a14}.article-visual img{border-radius:10px;width:100%}.article-visual figcaption{color:#475569;text-align:center;font-size:.94rem;font-weight:700;line-height:1.5}.article-visual-actions{justify-content:center;display:flex}.article-visual-share-link{color:#fff;background:#0f766e;border-radius:999px;justify-content:center;align-items:center;min-height:40px;padding:8px 14px;font-size:.92rem;font-weight:800;text-decoration:none;transition:background-color .2s,transform .2s;display:inline-flex}.article-visual-share-link:hover,.article-visual-share-link:focus{color:#fff;background:#115e59;transform:translateY(-1px)}.sudoku-visual-grid{aspect-ratio:1;background:#fff;border:3px solid #0f172a;border-radius:8px;grid-template-rows:repeat(9,minmax(0,1fr));grid-template-columns:repeat(9,minmax(0,1fr));width:min(100%,440px);margin:0 auto;display:grid;overflow:hidden}.sudoku-visual-cell{box-sizing:border-box;color:#0f172a;border-bottom:1px solid #cbd5e1;border-right:1px solid #cbd5e1;place-items:center;min-width:0;min-height:0;font-size:clamp(1rem,4vw,1.65rem);font-weight:800;line-height:1;display:grid;position:relative}.sudoku-visual-digit{line-height:1}.sudoku-visual-cell--box-right{border-right-width:3px;border-right-color:#0f172a}.sudoku-visual-cell--box-bottom{border-bottom-width:3px;border-bottom-color:#0f172a}.sudoku-visual-cell--focus,.sudoku-visual-cell--primary{color:#1e3a8a;background:#dbeafe}.sudoku-visual-cell--related{background:#fef3c7}.sudoku-visual-cell--candidate{background:#f0f9ff}.sudoku-visual-cell--solution{color:#166534;background:#dcfce7}.sudoku-visual-cell--eliminated{color:#991b1b;background:#fee2e2}.sudoku-visual-candidates{box-sizing:border-box;color:#475569;grid-template-rows:repeat(3,minmax(0,1fr));grid-template-columns:repeat(3,minmax(0,1fr));width:100%;min-width:0;height:100%;min-height:0;padding:4px;font-size:clamp(.52rem,1.6vw,.72rem);font-weight:700;line-height:1;display:grid}.sudoku-visual-candidates span{justify-content:center;align-items:center;display:flex}.feature-request-form{gap:18px;display:grid}.feature-request-form label{color:#1f2937;margin-bottom:8px;font-weight:700;display:block}.feature-request-form textarea{resize:vertical;color:#1f2937;width:100%;min-height:180px;font:inherit;border:1px solid #cbd5e1;border-radius:6px;padding:12px;line-height:1.6}.feature-request-form textarea:focus{border-color:#667eea;outline:none;box-shadow:0 0 0 3px #667eea2e}.feature-request-form button{color:#fff;cursor:pointer;font:inherit;background:#1f2937;border:none;border-radius:6px;justify-self:start;padding:12px 18px;font-weight:700}.feature-request-form button:hover{background:#111827}.feature-request-success{color:#166534;background:#dcfce7;border:1px solid #86efac;border-radius:6px;margin-bottom:18px;padding:12px;font-weight:700}.strategy-card h4{color:#667eea;margin-bottom:10px}.faq-item h3{margin-top:0}.difficulty-badge{border-radius:20px;margin-left:10px;padding:5px 15px;font-size:.9em;font-weight:700;display:inline-block}.easy{color:#155724;background:#d4edda}.medium{color:#856404;background:#fff3cd}.hard{color:#721c24;background:#f8d7da}.practice-tip{background:#e7f3ff;border-left:4px solid #2196f3;margin:15px 0;padding:15px}.key-point{background:#fff8e1;border-radius:5px;margin:15px 0;padding:15px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin:30px 0;display:grid}.stat-card{color:#fff;text-align:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:10px;padding:25px}.stat-number{margin-bottom:10px;font-size:2.5em;font-weight:700}.stat-label{opacity:.9;font-size:1.1em}