:root{color-scheme:dark;--bg: #090a0d;--panel: #12141a;--panel-2: #171a21;--panel-3: #20242d;--text: #f5f2e9;--muted: #a39f94;--faint: #6d6a63;--line: #2e3138;--mustard: #f5bb26;--ketchup: #ff4b32;--cyan: #39d6ea;--shadow: 0 18px 55px rgba(0, 0, 0, .42);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 20% 0%,rgba(245,187,38,.09),transparent 28rem),linear-gradient(135deg,#090a0d,#0f1116 58%,#15120b);color:var(--text)}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding:18px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:18px;max-width:1560px;margin:0 auto 18px;padding:12px 14px;border:1px solid rgba(245,187,38,.18);background:#0c0d10d6;box-shadow:var(--shadow)}.brand{display:flex;align-items:center;min-width:0;gap:12px}.brand img{width:46px;height:46px;object-fit:contain;border-radius:8px;background:#050506}.brand h1,.brand p,.rail-head h2,.stage-head h2{margin:0}.brand h1{font-size:clamp(1.15rem,1.8vw,1.65rem);letter-spacing:0}.brand p{margin-top:2px;color:var(--muted);font-size:.86rem}.top-actions,.export-row{display:flex;align-items:center;gap:10px}.primary-btn,.secondary-btn,.ghost-btn{min-height:40px;border:1px solid transparent;padding:0 14px;border-radius:6px;color:var(--text);font-weight:800;letter-spacing:0}.primary-btn{background:linear-gradient(135deg,var(--mustard),#ff7b29);color:#15100a}.primary-btn:disabled{cursor:wait;opacity:.62}.secondary-btn,.ghost-btn{background:var(--panel-3);border-color:var(--line)}.ghost-btn{color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(250px,330px) minmax(0,1fr) minmax(280px,360px);gap:18px;max-width:1560px;margin:0 auto}.rail,.stage{border:1px solid var(--line);background:#12141aeb;box-shadow:var(--shadow)}.rail{min-height:calc(100vh - 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