:root{--bg: #fafaf9;--panel: #ffffff;--ink: #1c1917;--muted: #78716c;--line: #e7e5e4;--accent: #4f46e5;--green: #16a34a;--amber: #f59e0b;--red: #dc2626;--guide-bg: #eef2ff;--guide-line: #c7d2fe;--placeholder: #eee;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #0c0a09;--panel: #1c1917;--ink: #f5f5f4;--muted: #a8a29e;--line: #44403c;--accent: #6366f1;--green: #22c55e;--red: #f87171;--guide-bg: #1e1b4b;--guide-line: #3730a3;--placeholder: #292524}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif}.app{max-width:1020px;margin:0 auto;padding:24px 16px 64px}header h1{margin:0 0 4px;font-size:28px}.header-row{justify-content:space-between;margin:0}.lang-select{flex:0 0 auto;min-width:0;width:auto}.muted{color:var(--muted)}.error{color:var(--red)}.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px;margin:16px 0}.panel 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p{font-size:14px;margin:6px 0}.panel{padding:14px 12px;margin:12px 0}.btn,.btn.sm,.chip,.tab{min-height:44px;font-size:15px}.btn,.btn.sm{padding:10px 14px;text-align:center}.input{font-size:16px;min-width:0}.step{font-size:12px;padding:4px;gap:4px}.sizes .chip,.tabs .tab{flex:1;padding:8px 6px}.tabs{flex-wrap:wrap}.chip.large small{font-size:11px}.upload-btn,.next-btn{display:block;width:100%}.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.card .row{flex-direction:column;align-items:stretch;gap:6px}.crop-wrap{flex-direction:column;align-items:center;gap:10px}.crop-canvas{width:100%}.legend{align-self:stretch}.controls{flex-direction:column;align-items:stretch;gap:12px}.controls input[type=range]{width:100%;height:32px}.share{flex-direction:column;text-align:center}.share-actions{justify-content:center}.share-actions .btn{flex:1}#step-print .row{flex-wrap:wrap}#step-print .row 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