:root{--bg: #fafaf9;--fg: #1c1917;--muted: #78716c;--accent: #2563eb;--on-accent: #ffffff;--card: #ffffff;--line: #e7e5e4;--danger: #dc2626;--good: #059669;--soft: #f5f5f4;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #0c0a09;--fg: #f5f5f4;--muted: #a8a29e;--accent: #60a5fa;--on-accent: #0c0a09;--card: #1c1917;--line: #292524;--danger: #f87171;--good: #34d399;--soft: #292524}}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Apple SD Gothic Neo,Noto Sans KR,sans-serif}.container{max-width:480px;margin:0 auto;padding:24px 16px}h1{font-size:1.6rem;margin:0 0 4px}h2{font-size:1.1rem;margin:0 0 8px}h2:focus{outline:none}.lead{color:var(--muted);margin:0 0 8px}.notice{background:var(--soft);border-radius:8px;padding:8px 12px;margin:0}.small{font-size:.85rem;color:var(--muted)}label{display:block;font-weight:600;margin:12px 0 4px;font-size:.9rem}input,select,textarea,button{font:inherit;width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--fg)}input[aria-invalid=true]{border-color:var(--danger)}button{background:var(--accent);color:var(--on-accent);border:none;cursor:pointer;margin-top:16px;font-weight:600;min-height:44px}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button.secondary{background:var(--card);color:var(--accent);border:1px solid var(--accent)}button.danger{background:transparent;color:var(--danger);border:1px solid var(--line);width:auto;margin:0;padding:6px 14px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;margin-top:16px}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.error{color:var(--danger);font-size:.8rem;margin:4px 0 0;min-height:0}.error:empty{display:none}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px}.tab{margin:0;background:var(--soft);color:var(--fg);border:1px solid var(--line)}.tab[aria-pressed=true]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.order-list{list-style:none;padding:0;margin:0}.order-item{border-top:1px solid var(--line);padding:12px 0}.order-item:first-child{border-top:none;padding-top:0}.item-name{font-weight:700;margin:0}.item-controls{display:flex;justify-content:space-between;align-items:center;margin-top:12px;gap:8px}.stepper{display:flex;align-items:center;gap:8px}.stepper button{width:44px;margin:0;padding:0;font-size:1.2rem}.stepper output{min-width:3em;text-align:center;font-weight:600}.item-diff{margin:8px 0 0}.result{border:2px solid var(--accent)}.big{font-size:1.15rem;margin:8px 0}.big strong{font-size:1.5rem}#r-diff{color:var(--danger)}#r-savings{color:var(--good)}.comment{font-weight:700;margin:8px 0 0}.actions{display:grid;grid-template-columns:1fr;gap:8px}.actions:has(#share-btn:not([hidden])){grid-template-columns:1fr 1fr}.actions button{margin-top:12px}#fallback textarea{resize:vertical}