:root{--navy-900: #0a1226;--navy-800: #0f1b36;--orange: #f26b1d;--white: #ffffff;--bg: #eef0f3;--surface: #ffffff;--border: #d5d9e0;--text: #141a28;--muted: #5b6577;--stage-bg: #1b2030;--radius: 4px;--gap: 16px;--font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*,*:before,*:after{box-sizing:border-box}html,body{margin:0}body{font-family:var(--font-ui);font-size:14px;line-height:1.45;color:var(--text);background:var(--bg);min-height:100vh;display:flex;flex-direction:column}.skip-link{position:absolute;left:8px;top:-48px;background:var(--navy-900);color:var(--white);padding:8px 12px;border-radius:var(--radius);z-index:10}.skip-link:focus{top:8px}:focus-visible{outline:2px solid var(--orange);outline-offset:2px}.app-header{display:flex;align-items:center;justify-content:space-between;gap:var(--gap);padding:10px 20px;background:var(--navy-900);color:var(--white);border-bottom:3px solid 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var(--border)}.seg.is-active{background:var(--navy-800);color:var(--white)}.canvas-frame{background:var(--stage-bg);min-height:420px;display:grid;place-items:center;padding:24px}.empty-state{text-align:center;color:#aab3c7;max-width:320px}.empty-title{margin:0 0 4px;color:var(--white);font-weight:600}.empty-text{margin:0;font-size:13px}@media(max-width:1000px){.workspace{grid-template-columns:minmax(0,1fr)}.stage{order:-1}.app-header{flex-direction:column;align-items:flex-start}}[hidden]{display:none!important}.message{margin:8px 0 0;padding:8px 10px;font-size:12px;border-radius:var(--radius);background:#eef2fa;border:1px solid var(--border)}.message[data-kind=error]{background:#fdeceb;border-color:#e0a29d;color:#7a1c14}.info{margin:12px 0 0;display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:12px}.info dt{color:var(--muted)}.info dd{margin:0;min-width:0;overflow-wrap:anywhere}.btn-secondary{margin-top:12px;padding:6px 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