:root{--bg: #f3f4f6;--panel: #ffffff;--border: #e5e7eb;--text: #1f2937;--muted: #6b7280;--primary: #1a1a2e;--primary-light: #2d2d5a;--accent: #3b82f6;--danger: #ef4444;--success: #10b981;--warning: #f59e0b}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;color:var(--text);background:var(--bg)}button{font-family:inherit;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{font-family:inherit;font-size:14px}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;gap:4px;padding:8px 16px;border:1px solid var(--border);border-radius:6px;background:var(--panel);color:var(--text);font-size:14px}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.card{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:16px}