:root{--bg:#f4f7fb;--card:#fff;--text:#172033;--muted:#6b7486;--line:#dfe5ee;--blue:#275df6;--blue2:#1748d0;--danger:#c63c3c;--shadow:0 14px 40px rgba(22,35,66,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}.hidden{display:none!important}.topbar{display:flex;align-items:center;justify-content:space-between;padding:22px 32px;background:#10182a;color:white;position:sticky;top:0;z-index:20}.topbar h1{font-size:22px;margin:2px 0 0}.eyebrow{font-size:10px;letter-spacing:.16em;color:#91a2c8}.top-actions{display:flex;gap:10px;align-items:center}main{max-width:1480px;margin:28px auto;padding:0 24px 60px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.workspace{display:grid;grid-template-columns:minmax(0,1.12fr) 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var(--line);border-radius:10px;padding:12px}.login-card .primary{width:100%;padding:13px}.brand-mark{width:46px;height:46px;border-radius:13px;background:var(--blue);color:white;display:grid;place-items:center;font-weight:900}.badge{border-radius:999px;padding:6px 9px;font-size:11px;font-weight:800}.badge.warning{background:#fff1b9;color:#6f5200}@media(max-width:1100px){.workspace{grid-template-columns:1fr}.preview-pane{border-right:0;border-bottom:1px solid var(--line)}.history-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:680px){.topbar{padding:16px;align-items:flex-start}.top-actions{flex-wrap:wrap;justify-content:flex-end}.topbar h1{font-size:17px}main{padding:0 12px;margin-top:14px}.preview-pane,.settings-pane{padding:16px}.preview-stage{min-height:300px}.choice-grid,.two-col,.size-options,.history-grid{grid-template-columns:1fr}.history-title{align-items:flex-start;flex-direction:column}}
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.preview-stage.empty{cursor:pointer;transition:border-color .18s,background .18s,box-shadow .18s}.preview-stage.empty:hover{border-color:var(--blue);background:#f5f8ff}.preview-stage.drag-over{border:2px solid var(--blue);background:#edf3ff;box-shadow:inset 0 0 0 4px rgba(39,93,246,.08)}.preview-stage.drag-over .empty-preview strong{color:var(--blue)}.preview-stage.uploading{cursor:progress;opacity:.82}.empty-preview small{font-size:11px;color:#8b95a8}.empty-preview span{font-size:13px;font-weight:700;color:#536078}