*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#2563eb;--primary-dark:#1d4ed8;--secondary:#10b981;--bg-main:#f8fafc;--bg-card:#fff;--text-main:#1e293b;--text-muted:#64748b;--border:#e2e8f0;--shadow:0 4px 6px -1px rgba(0,0,0,.1)}body{font-family:Malgun Gothic,Apple SD Gothic Neo,sans-serif;background:var(--bg-main);color:var(--text-main);line-height:1.8;font-size:18px}h1{font-size:2.5rem;margin-bottom:1rem;color:var(--primary)}h2{font-size:2rem;margin-bottom:.75rem;color:var(--text-main)}h3{font-size:1.5rem;margin-bottom:.5rem}p{font-size:1.125rem;margin-bottom:1rem}.card{background:var(--bg-card);border-radius:12px;padding:1.5rem;box-shadow:var(--shadow);margin-bottom:1.5rem;border:1px solid var(--border)}.card:hover{box-shadow:0 8px 12px -2px rgba(0,0,0,.15)}.btn{display:inline-block;padding:.75rem 1.5rem;background:var(--primary);color:#fff;border-radius:8px;text-decoration:none;font-size:1.125rem;font-weight:600;transition:background .2s}.btn:hover{background:var(--primary-dark)}.header{background:#fff;padding:1rem 2rem;box-shadow:var(--shadow);position:-webkit-sticky;position:sticky;top:0;z-index:100}.header-content{max-width:1000px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.logo{font-size:1.5rem;font-weight:700;color:var(--primary);text-decoration:none}.main{max-width:900px;margin:0 auto;padding:2rem 1rem}.tip-card{cursor:pointer}.tip-card h3{color:var(--primary)}.tip-card .category{display:inline-block;background:#dbeafe;color:#1e40af;padding:.25rem .75rem;border-radius:20px;font-size:.875rem;margin-bottom:.5rem}.tip-card .description{color:var(--text-muted)}.tip-detail{background:#fff;padding:2rem;border-radius:12px;box-shadow:var(--shadow)}.tip-detail .step{margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px solid var(--border)}.tip-detail .step:last-child{border-bottom:none}.tip-detail .step-number{display:inline-block;width:40px;height:40px;background:var(--primary);color:#fff;border-radius:50%;text-align:center;line-height:40px;font-weight:700;margin-right:.5rem}.tip-detail img{max-width:100%;border-radius:8px;margin:1rem 0;border:2px solid var(--border)}.adsense{margin:2rem 0;min-height:100px;display:flex;justify-content:center;align-items:center}.adsense,.footer{text-align:center}.footer{background:#1e293b;color:#fff;padding:2rem;margin-top:3rem}.footer a{color:#93c5fd}.icon{font-size:1.5rem;margin-right:.5rem}@media (max-width:768px){body{font-size:16px}h1{font-size:1.75rem}h2{font-size:1.5rem}.header{padding:.75rem 1rem}}