:root{--color-bg: #f7f8fb;--color-surface: #ffffff;--color-border: #e2e8f0;--color-text: #0f172a;--color-muted: #64748b;--color-brand: #4f46e5;--color-brand-hover: #4338ca;--color-success: #10b981;--color-warn: #f59e0b;--color-danger: #ef4444}*{box-sizing:border-box}body,html,#app,.app-root{margin:0;padding:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);font-size:14px}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit;font-size:14px}.btn{padding:.5rem 1rem;border-radius:8px;border:none;font-weight:600;font-size:.875rem;transition:background .15s ease,opacity .15s ease}.btn-primary{background:var(--color-brand);color:#fff}.btn-primary:hover{background:var(--color-brand-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--color-muted);border:1px solid var(--color-border)}.btn-ghost:hover{background:#f1f5f9}.btn-danger{background:var(--color-danger);color:#fff}.card{background:var(--color-surface);border-radius:12px;padding:1.25rem;border:1px solid var(--color-border)}.muted{color:var(--color-muted)}