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sans-serif;font-family:var(--font-family);color:var(--text-primary);background:var(--bg-page);-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body,#app{min-height:100vh;margin:0;padding:0}body{background:var(--bg-page)}button,input,select{font-family:inherit}.btn{border-radius:var(--radius);cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;gap:6px;padding:8px 16px;font-size:14px;transition:all .2s;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-default{border-color:var(--border);color:var(--text-primary);background:#fff}.btn-default:hover{border-color:var(--primary);color:var(--primary)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{color:var(--primary);background:var(--primary-light)}.card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow-card)}.section-title{color:var(--text-primary);margin:0 0 12px;font-size:18px;font-weight:600}.text-secondary{color:var(--text-secondary)}.tag{border-radius:4px;align-items:center;padding:2px 8px;font-size:12px;font-weight:500;display:inline-flex}.tag-math{background:var(--math-light);color:var(--math)}.tag-physics{background:var(--physics-light);color:var(--physics)}.tag-chemistry{background:var(--chemistry-light);color:var(--chemistry)}@media (width<=768px){:root{font-size:14px}}