:root{--color-bg-primary:#fafbfc;--color-text-primary:#0f172a;--color-text-secondary:#475569;--color-border-subtle:#e2e8f0;--color-severity-blk:#b91c1c;--color-severity-alt:#b45309;--color-severity-ost:#047857;--radius-md:6px;--space-2:8px;--space-3:12px;--space-4:16px;--space-6:24px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--color-bg-primary);color:var(--color-text-primary);font-size:16px;line-height:1.55}main{max-width:880px;margin:0 auto;padding:var(--space-6)}h1,h2,h3{margin-top:0}.btn{display:inline-block;padding:var(--space-3) var(--space-4);background:#1d4ed8;color:#fff;border:0;border-radius:var(--radius-md);font-size:16px;font-weight:600;cursor:pointer;text-decoration:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--color-text-primary);border:1px solid var(--color-border-subtle)}input[type=file]{padding:var(--space-2)}.card{border:1px solid var(--color-border-subtle);border-radius:var(--radius-md);padding:var(--space-4);background:#fff;margin:var(--space-4) 0}a{color:#1d4ed8}