* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg: #0f0f1a;
    --fg: #e8e8ec;
    --muted: #8a8a9a;
    --accent: #4ade80;
    --accent-dim: #22c55e;
    --card: #181826;
    --border: #2a2a3e;
    --user-msg: #1e3a2e;
    --assistant-msg: #1a1a2e;
}
@media (prefers-color-scheme: light) {
    :root {
        --bg: #f5f5f7;
        --fg: #1d1d1f;
        --muted: #6e6e73;
        --card: #ffffff;
        --border: #d2d2d7;
        --user-msg: #e8f5e9;
        --assistant-msg: #f5f5f7;
    }
}
html, body { height: 100%; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--fg); }
.app-container { display: flex; flex-direction: column; height: 100vh; max-width: 600px; margin: 0 auto; }
.header { padding: 16px; text-align: center; border-bottom: 1px solid var(--border); }
.header h1 { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; }
.warning { margin-top: 8px; font-size: 0.8rem; color: #fbbf24; }
.hidden { display: none !important; }
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.chat-container { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.message { max-width: 85%; padding: 12px 16px; border-radius: 16px; line-height: 1.5; font-size: 0.95rem; animation: fadeIn 0.2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.message.user { align-self: flex-end; background: var(--user-msg); border-bottom-right-radius: 4px; }
.message.assistant { align-self: flex-start; background: var(--assistant-msg); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.message.interim { opacity: 0.6; font-style: italic; }
.input-area { padding: 12px 16px; border-top: 1px solid var(--border); background: var(--bg); }
.input-wrapper { display: flex; align-items: flex-end; gap: 8px; }
.mic-btn { flex-shrink: 0; width: 44px; height: 44px; border-radius: 50%; border: none; background: var(--card); color: var(--fg); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s; }
.mic-btn:hover:not(:disabled) { background: var(--border); }
.mic-btn.listening { background: var(--accent); color: #000; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.5); } 50% { box-shadow: 0 0 0 10px rgba(74, 222, 128, 0); } }
.mic-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.mic-icon.listening { display: none; }
.mic-btn.listening .mic-icon:not(.listening) { display: none; }
.mic-btn.listening .mic-icon.listening { display: block; }
.message-input { flex: 1; min-height: 44px; max-height: 120px; padding: 10px 14px; border: 1px solid var(--border); border-radius: 22px; background: var(--card); color: var(--fg); font-size: 1rem; line-height: 1.5; resize: none; outline: none; font-family: inherit; }
.message-input:focus { border-color: var(--accent); }
.message-input::placeholder { color: var(--muted); }
.send-btn { flex-shrink: 0; width: 44px; height: 44px; border-radius: 50%; border: none; background: var(--accent); color: #000; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: background 0.2s; }
.send-btn:hover { background: var(--accent-dim); }
@media (max-width: 480px) {
    .message { max-width: 90%; font-size: 1rem; }
}