:root{--bg: #0a0a0a;--panel: #141414;--panel-border: #262626;--text: #e5e5e5;--text-dim: #888;--accent: #f5a623;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;width:100%;overflow:hidden}.app{display:grid;grid-template-columns:320px minmax(0,1fr);height:100vh;position:relative}.app.sidebar-collapsed{grid-template-columns:0 minmax(0,1fr)}.viewport{position:relative;background:var(--bg);min-width:0;min-height:0}.sidebar{background:var(--panel);border-right:1px solid var(--panel-border);padding:16px;overflow-y:auto;overflow-x:hidden;transition:transform .2s ease;min-width:0}.app.sidebar-collapsed .sidebar{transform:translate(-320px)}.sidebar-toggle{position:absolute;top:12px;left:12px;z-index:10;background:var(--panel);border:1px solid var(--panel-border);color:var(--text);width:32px;height:32px;border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;padding:0}.sidebar-toggle:hover{background:#1c1c1c}@media (max-width: 768px){.app{grid-template-columns:minmax(0,1fr)}.sidebar{position:fixed;top:0;left:0;bottom:0;width:320px;z-index:5;box-shadow:4px 0 24px #0009}.app.sidebar-collapsed .sidebar{transform:translate(-100%)}}.sidebar h1{font-size:18px;margin:0 0 4px;letter-spacing:-.01em}.sidebar .tagline{font-size:12px;color:var(--text-dim);margin:0 0 24px}.dropzone{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none}.dropzone.active{background:#f5a62314;border:2px dashed var(--accent);pointer-events:auto}.dropzone-hint{background:var(--panel);border:1px solid var(--panel-border);padding:12px 20px;border-radius:8px;font-size:13px;color:var(--text-dim)}