:root{--bg:#f1f5f9;--bg-card:#fff;--text-main:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--primary:#2563eb;--primary-hover:#1d4ed8;--success:#10b981;--danger:#ef4444;--header-bg:#fff}[data-theme=dark]{--bg:#0f172a;--bg-card:#1e293b;--text-main:#f8fafc;--text-muted:#94a3b8;--border:#334155;--primary:#3b82f6;--primary-hover:#2563eb;--success:#10b981;--danger:#ef4444;--header-bg:#1e293b}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg);color:var(--text-main);min-height:100vh;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;transition:background-color .3s,color .3s}input[type=text],input[type=email],input[type=password],select{border:1px solid var(--border);background-color:var(--bg);width:100%;color:var(--text-main);border-radius:6px;outline:none;padding:.6rem .75rem;font-family:inherit;font-size:.875rem;transition:all .2s}input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb33}button{cursor:pointer;border:1px solid var(--border);background-color:var(--bg-card);color:var(--text-main);border-radius:6px;padding:.5rem 1rem;font-family:inherit;font-size:.875rem;font-weight:600;transition:all .2s}button:hover{background-color:var(--bg);border-color:var(--primary);color:var(--primary)}button.btn-primary{background-color:var(--primary);color:#fff;border:none}button.btn-primary:hover{background-color:var(--primary-hover);color:#fff}