:root{--bg: #0f1419;--surface: #1a2332;--border: #2d3a4d;--text: #e8edf4;--muted: #8b9cb3;--accent: #3d9df0;--accent-dim: #2563a8;--danger: #e85d5d;--radius: 10px;font-family:IBM Plex Sans KR,system-ui,sans-serif;line-height:1.5;font-weight:400;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}input,select,textarea{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);padding:.55rem .75rem}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px}button{cursor:pointer;border:none;border-radius:var(--radius);font-weight:600}.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-dim));color:#fff;padding:.6rem 1.1rem}.btn-primary:hover{filter:brightness(1.08)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--muted);padding:.4rem .75rem}.btn-ghost:hover{color:var(--text)}.btn-danger{background:#5c2a2a;color:#fecaca;padding:.35rem .65rem;font-size:.85rem}.btn-danger:hover{background:#7a3333}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.25rem}.stack{display:flex;flex-direction:column;gap:.85rem}.row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}.muted{color:var(--muted);font-size:.9rem}.error-msg{color:var(--danger);font-size:.9rem;margin:0}h1{font-size:1.35rem;font-weight:700;margin:0 0 .25rem}h2{font-size:1.05rem;font-weight:600;margin:0 0 .75rem;color:var(--muted)}