: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 1fr;height:100vh}.viewport{position:relative;background:var(--bg)}.sidebar{background:var(--panel);border-right:1px solid var(--panel-border);padding:16px;overflow-y:auto}.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)}