*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-base: #0f0f1a;--bg-surface: #1a1a2e;--bg-elevated: #22223a;--bg-hover: #2a2a46;--accent: #4a9eff;--accent-hover: #6ab4ff;--success: #4caf82;--error: #e05a5a;--text-primary: #e8e8f0;--text-secondary: #9999b8;--border: #2e2e4e;--radius: 8px;--radius-sm: 4px;font-family:Segoe UI,system-ui,sans-serif;color-scheme:dark}body{background:var(--bg-base);color:var(--text-primary);min-height:100vh;overflow:hidden}.app-layout{display:flex;flex-direction:column;height:100vh}.app-header{background:var(--bg-surface);border-bottom:1px solid var(--border);padding:12px 24px;display:flex;align-items:baseline;gap:16px;flex-shrink:0}.app-header h1{font-size:1.4rem;font-weight:700;color:var(--accent);letter-spacing:-.5px}.app-subtitle{font-size:.85rem;color:var(--text-secondary)}.app-main{display:flex;flex:1;overflow:hidden}.sidebar{width:300px;min-width:260px;max-width:340px;background:var(--bg-surface);border-right:1px solid 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