:root{color:#17212b;background:#f6f8f3;font-family:Inter,Segoe UI,PingFang SC,Microsoft YaHei,Arial,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{min-height:100vh;padding:24px;background:linear-gradient(90deg,rgba(26,107,120,.08) 1px,transparent 1px),linear-gradient(180deg,rgba(26,107,120,.08) 1px,transparent 1px),#f6f8f3;background-size:32px 32px}.workspace{display:grid;grid-template-columns:340px minmax(0,1fr);gap:20px;max-width:1440px;margin:0 auto}.control-panel,.preview-panel{border:1px solid rgba(24,33,43,.12);background:rgba(255,255,255,.92);box-shadow:0 18px 50px #232c3614}.control-panel{position:sticky;top:24px;align-self:start;display:flex;flex-direction:column;gap:18px;padding:20px;border-radius:8px}.preview-panel{min-width:0;border-radius:8px;overflow:hidden}.brand{display:flex;gap:12px;align-items:center}.brand-mark{display:grid;width:44px;height:44px;place-items:center;border-radius:8px;color:#fff;background:#116a7b}h1,h2,p{margin:0}.brand h1{font-size:21px;line-height:1.2}.brand p,.usage-empty,.eyebrow{color:#68747d}.brand p{margin-top:4px;font-size:13px}.upload-zone{display:grid;min-height:128px;place-items:center;gap:8px;padding:18px;border:1px dashed #7b8d97;border-radius:8px;color:#2f4858;background:#f7fbfc;text-align:center;cursor:pointer}.upload-zone input{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.error-message{padding:10px 12px;border:1px solid rgba(197,54,54,.22);border-radius:8px;color:#a12626;background:#fff4f2;font-size:13px}.panel-section{display:grid;gap:12px}.section-title{display:flex;align-items:center;gap:8px;color:#293640}.section-title h2,.usage-heading h2{font-size:15px}.number-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}label{display:grid;gap:7px;color:#4a5963;font-size:13px}input[type=number],select{width:100%;min-height:40px;padding:0 10px;border:1px solid #cbd5d8;border-radius:8px;color:#17212b;background:#ffffff}.segmented-control{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:4px;border-radius:8px;background:#e9eff0}.segmented-control button{min-height:38px;border:0;border-radius:6px;color:#4a5963;background:transparent}.segmented-control button.active{color:#fff;background:#116a7b}.mono-controls{display:grid;gap:12px}input[type=range]{accent-color:#116a7b}.swatch-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}.swatch,.usage-swatch{display:block;border:1px solid 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75%),linear-gradient(-45deg,transparent 75%,#f0f3f0 75%),#ffffff;background-position:0 0,0 10px,10px -10px,-10px 0;background-size:20px 20px}.preview-stage canvas{max-width:100%;height:auto;border:1px solid rgba(23,33,43,.18);background:#ffffff;image-rendering:auto}.empty-state{display:grid;place-items:center;gap:12px;width:min(420px,100%);min-height:220px;border:1px dashed #89999f;border-radius:8px;color:#51626d;background:rgba(255,255,255,.86)}.usage-panel{padding:18px 20px 22px;border-top:1px solid rgba(24,33,43,.1)}.usage-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.usage-heading span{color:#68747d;font-size:13px}.usage-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:8px}.usage-row{display:grid;grid-template-columns:20px 1fr 30px auto;align-items:center;gap:9px;min-height:40px;padding:8px 10px;border:1px solid rgba(24,33,43,.08);border-radius:8px;background:#fbfcfb}.usage-swatch{width:20px;height:20px;border-radius:5px}.usage-name,.usage-symbol{min-width:0;color:#34434d}.usage-symbol{font-weight:700;text-align:center}.usage-row strong{color:#17212b}@media (max-width: 900px){.app-shell{padding:12px}.workspace{grid-template-columns:1fr}.control-panel{position:static}.toolbar{align-items:stretch;flex-direction:column}.toolbar-actions{justify-content:space-between}.preview-stage{min-height:360px;padding:14px}}@media (max-width: 520px){.number-grid,.usage-list{grid-template-columns:1fr}.swatch-grid{grid-template-columns:repeat(5,1fr)}.primary-button{flex:1}}