:root{--bg-base:#111;--bg-surface:#1e1e1e;--bg-sunken:#2a2a2a;--bg-group:#1a2a3a;--bg-success:#0d2a1a;--border-default:#333;--border-input:#444;--border-accent:#4a90d9;--text-default:#e8e8e8;--text-muted:#999;--text-subtle:#aaa;--text-faint:#ccc;--text-handle:#555;--text-group:#7ab3e8;--text-accent:#4a90d9;--color-accent:#4a90d9;--color-error:#e74c3c;--color-success:#27ae60;--color-success-badge:#4caf50;--color-warning:#e67e22;--shadow-card:0 1px 3px #0000004d;--shadow-ghost:0 4px 16px #0006;--shadow-auth:0 2px 16px #0006}[data-theme=light]{--bg-base:#f4f4f4;--bg-surface:#fff;--bg-sunken:#f4f4f4;--bg-group:#eef3fb;--bg-success:#f0faf4;--border-default:#e0e0e0;--border-input:#ccc;--border-accent:#4a90d9;--text-default:#1a1a1a;--text-muted:#555;--text-subtle:#444;--text-faint:#333;--text-handle:#aaa;--text-group:#2c5f9e;--text-accent:#4a90d9;--color-accent:#4a90d9;--color-error:#e74c3c;--color-success:#27ae60;--color-success-badge:#2e7d32;--color-warning:#e67e22;--shadow-card:0 1px 3px #0000000f;--shadow-ghost:0 4px 16px #00000026;--shadow-auth:0 2px 16px #00000014}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{background:var(--bg-base);color:var(--text-default);min-height:100vh;padding:0;font-family:system-ui,sans-serif}.container{margin:0 auto;padding:0 5rem}.centered{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;min-height:60vh;display:flex}.topbar{background:var(--bg-surface);border-bottom:1px solid var(--border-default);justify-content:space-between;align-items:center;gap:12px;padding:12px 24px;display:flex}.topbar span{color:var(--text-muted);font-size:.9rem}button{cursor:pointer;font:inherit;border:none;border-radius:6px;padding:8px 16px;transition:opacity .15s}button:hover{opacity:.85}.btn-primary{background:var(--color-accent);color:#fff}.btn-ghost{color:var(--color-accent);border:1px solid var(--color-accent);background:0 0}.btn-icon{border:1px solid 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