:root{color-scheme:light;--ink:#171528;--muted:#6f6a7d;--line:#e9e4ef;--panel:#fff;--bg:#f7f4ef;--accent:#6650a4;--accent2:#ffd05a;--danger:#a12c36;--shadow:0 16px 45px rgba(30,24,46,.08);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);min-height:100vh}.shell{width:min(760px,100%);margin:auto;padding:28px 20px max(32px,env(safe-area-inset-bottom))}.hero{display:flex;gap:16px;align-items:center;margin:14px 0 32px}.brand-mark{width:54px;height:54px;border-radius:17px;background:var(--ink);color:white;display:grid;place-items:center;font:700 27px Georgia,serif;box-shadow:var(--shadow)}.eyebrow,.step{margin:0 0 4px;font-size:12px;font-weight:800;letter-spacing:.17em;color:var(--accent)}h1{font-size:clamp(34px,8vw,48px);line-height:1;margin:0;letter-spacing:-.04em}h2{font-size:24px;margin:0;letter-spacing:-.025em}.tagline{margin:7px 0 0;color:var(--muted);font-size:15px}.card{background:var(--panel);border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow);margin-bottom:18px}.stack{display:grid;gap:17px;margin-top:22px}label{display:grid;gap:8px;font-size:14px;font-weight:700}input{width:100%;border:1.5px solid #d9d2e1;border-radius:16px;padding:15px 16px;font:inherit;font-size:16px;color:var(--ink);background:#fff;outline:none;transition:.18s border,.18s box-shadow}input:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(102,80,164,.12)}.url-label input{font-size:17px;padding:17px}.optional{font-weight:500;color:var(--muted);font-size:12px}.primary,.secondary,.icon-button,.text-button{font:inherit;cursor:pointer;border:0}.primary{min-height:56px;border-radius:17px;background:var(--accent2);color:var(--ink);font-size:18px;font-weight:800;padding:14px 18px}.primary:disabled{opacity:.55;cursor:wait}.secondary{border-radius:14px;background:#f0ebf7;color:var(--ink);font-weight:750;padding:12px 15px}.full{width:100%}.text-button{background:none;color:var(--muted);font-weight:700;padding:8px}.icon-button{width:42px;height:42px;border-radius:14px;background:#eee9f5;font-size:20px}.section-head,.history-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.error{color:var(--danger);font-size:14px;min-height:1em;margin:0}.muted,.notice{color:var(--muted);line-height:1.65}.notice{background:#f5f0ff;border-radius:14px;padding:12px 14px;font-size:13px;margin:17px 0 0}.result-card{background:var(--ink);color:white}.result-card .step{color:#cdbff7}.short-row{display:grid;grid-template-columns:1fr auto;gap:10px;margin:18px 0}.short-url{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;background:rgba(255,255,255,.09);border-radius:14px;padding:13px 14px;color:white;font-weight:700;text-decoration:none}.qr-wrap{background:white;border-radius:20px;padding:18px;display:grid;place-items:center;margin:15px auto;width:min(100%,310px)}.qr{display:block;width:100%;height:auto;image-rendering:pixelated}.history{margin-top:34px}.history-list{display:grid;gap:12px;margin-top:16px}.history-item{background:white;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:0 8px 22px rgba(30,24,46,.05)}.history-title{font-weight:800;margin:0 0 6px;font-size:16px}.history-url{display:block;color:var(--accent);font-weight:700;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-date{color:var(--muted);font-size:12px;margin:7px 0 13px}.history-actions{display:flex;gap:8px;flex-wrap:wrap}.history-qr{margin-top:14px;border-top:1px solid var(--line);padding-top:14px;display:none}.history-qr.open{display:grid;gap:10px}.history-qr img{width:min(230px,100%);background:white;padding:10px;border:1px solid var(--line);border-radius:14px}.empty{color:var(--muted);text-align:center;padding:34px 12px}.auth-card{margin-top:48px}footer{text-align:center;color:#8a8493;font-size:12px;padding:24px 0}@media(max-width:560px){.shell{padding:18px 14px max(28px,env(safe-area-inset-bottom))}.hero{margin-top:6px}.card{border-radius:24px;padding:21px}.short-row{grid-template-columns:1fr}.short-row .secondary{width:100%}.history-actions .secondary{flex:1 1 120px}}@media(prefers-reduced-motion:no-preference){.card{animation:rise .32s ease both}@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}}