:root{--bg: #1a1a2e;--bg-sidebar: #16213e;--bg-card: #0f3460;--bg-input: #1a1a2e;--bg-hover: rgba(255, 255, 255, .05);--text: #e0e0e0;--text-dim: #888;--text-muted: #666;--accent: #4da6ff;--accent-hover: #6bb8ff;--success: #4caf50;--warning: #ff9800;--danger: #f44336;--border: #2a2a4a;--radius: 6px;--font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;--font-mono: "SF Mono", "Fira Code", monospace;--font-size-base: 13px;--font-size-sm: 12px;--font-size-xs: 11px;--bg-primary: var(--bg);--bg-secondary: var(--bg-sidebar);--bg-tertiary: var(--bg-hover);--text-primary: var(--text);--text-secondary: var(--text-dim)}.btn{padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-card);color:var(--text);font-size:var(--font-size-base);cursor:pointer;transition:all 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var(--border);border-radius:var(--radius);background:var(--bg-input);color:var(--text);font-size:var(--font-size-base);font-family:var(--font-family);resize:none;outline:none;transition:border-color .15s;min-height:4rem;max-height:120px}.chat-input-area textarea:focus{border-color:var(--accent)}.btn-mic,.btn-narrate,.btn-voice{width:36px;height:36px;padding:0;border-radius:50%;border:1px solid var(--border);background:var(--bg-card);color:var(--text);display:flex;align-items:center;justify-content:center;flex-shrink:0;cursor:pointer;transition:border-color .2s,background .2s}.btn-mic:hover,.btn-narrate:hover,.btn-voice:hover:not(:disabled){background:var(--accent);color:#000;border-color:var(--accent)}.btn-mic.recording,.btn-voice.recording{background:var(--danger);border-color:var(--danger);color:#fff;animation:pulse-mic 1s ease-in-out infinite}.btn-narrate.recording,.btn-voice.btn-narrate.recording{background:#e67e22;border-color:#e67e22;color:#fff;animation:pulse-mic 1s ease-in-out 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