:root{--bg: #0b1020;--bg-soft: #131a2d;--panel: #161d33;--line: #263149;--text: #e8edf7;--muted: #97a3bd;--accent: #4c8dff;--accent-strong: #2f6fe4;--ok: #4ade80;--warn: #fbbf24;--err: #f87171;--radius: 12px;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{background:radial-gradient(1200px 600px at 20% -10%,#1b2748 0%,var(--bg) 60%);color:var(--text);font:15px/1.5 system-ui,-apple-system,Segoe UI,Noto Sans SC,sans-serif}.app{min-height:100vh;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:8px;min-width:0}.brand__mark{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:8px;background:var(--accent-strong);color:#fff;font-size:12px;font-weight:700;letter-spacing:.5px}.brand__name{font-weight:650;letter-spacing:.2px}.brand--lg .brand__mark{width:34px;height:34px;font-size:14px}.brand--lg .brand__name{font-size:18px}.btn{appearance:none;border:1px solid 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