/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:   #2563eb;
  --primary-dk:#1d4ed8;
  --accent:    #10b981;
  --bg:        #f0f4f8;
  --surface:   #ffffff;
  --border:    #e2e8f0;
  --text:      #1e293b;
  --muted:     #64748b;
  --danger:    #ef4444;
  --radius:    12px;
  --shadow:    0 4px 24px rgba(0,0,0,.08);
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Layout ── */
.app {
  display: flex;
  flex-direction: column;
  width: min(480px, 100%);
  height: min(780px, 100dvh);
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* ── Header ── */
header {
  background: var(--primary);
  color: #fff;
  padding: 20px 24px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,.2);
  display: grid;
  place-items: center;
  font-size: 22px;
  flex-shrink: 0;
}

.header-text h1 { font-size: 1.1rem; font-weight: 700; }
.header-text p  { font-size: .8rem; opacity: .8; margin-top: 2px; }

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  margin-left: auto;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(16,185,129,.3);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(16,185,129,.3); }
  50%       { box-shadow: 0 0 0 6px rgba(16,185,129,.1); }
}

/* ── TTS selector bar ── */
#tts-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tts-label {
  font-size: .75rem;
  color: var(--muted);
  font-weight: 500;
  margin-right: 2px;
}

.tts-btn {
  padding: 4px 12px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: .75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
}

.tts-btn:hover  { border-color: var(--primary); color: var(--primary); }
.tts-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }

#el-voice-select {
  display: none;
  margin-left: 4px;
  padding: 3px 8px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  font-size: .75rem;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  max-width: 130px;
}
#el-voice-select.visible { display: block; }

/* ── Status bar ── */
#status-bar {
  font-size: .78rem;
  text-align: center;
  padding: 6px 16px;
  background: #eff6ff;
  color: var(--primary);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  transition: background .3s, color .3s;
  flex-shrink: 0;
}

#status-bar.listening { background: #fef3c7; color: #92400e; }
#status-bar.thinking  { background: #ede9fe; color: #5b21b6; }
#status-bar.speaking  { background: #d1fae5; color: #065f46; }
#status-bar.error     { background: #fee2e2; color: #991b1b; }

/* ── Chat ── */
#chat {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

.msg {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: .88rem;
  line-height: 1.5;
  animation: fadeUp .2s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg.assistant {
  background: #f1f5f9;
  border-bottom-left-radius: 4px;
  align-self: flex-start;
}

.msg.user {
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 4px;
  align-self: flex-end;
}

.msg.system-msg {
  background: #f8fafc;
  color: var(--muted);
  font-size: .78rem;
  align-self: center;
  border-radius: 8px;
  text-align: center;
}

/* Typing indicator */
.typing-dots {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 14px;
}
.typing-dots span {
  width: 7px; height: 7px;
  background: var(--muted);
  border-radius: 50%;
  animation: bounce .9s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: .15s; }
.typing-dots span:nth-child(3) { animation-delay: .3s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40%           { transform: translateY(-6px); }
}

/* ── Text input ── */
#text-input-area {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
}

#text-input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 10px 16px;
  font-size: .88rem;
  outline: none;
  transition: border-color .2s;
}

#text-input:focus { border-color: var(--primary); }

#send-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1rem;
  transition: background .2s;
  flex-shrink: 0;
}
#send-btn:hover { background: var(--primary-dk); }

/* ── Controls ── */
.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 14px 16px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.btn-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  transition: all .2s;
  color: var(--muted);
}
.btn-icon:hover { border-color: var(--primary); color: var(--primary); }

/* Mic button */
#mic-btn {
  width: 64px; height: 64px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background .2s, transform .2s, box-shadow .08s ease-out;
  box-shadow: 0 4px 14px rgba(37,99,235,.4);
}
#mic-btn:hover  { background: var(--primary-dk); transform: scale(1.05); }
#mic-btn.active { background: var(--danger); }
#mic-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* No-speech fallback note */
.no-speech-note {
  font-size: .75rem;
  color: var(--muted);
  text-align: center;
  padding-bottom: 6px;
}

/* Scrollbar */
#chat::-webkit-scrollbar { width: 4px; }
#chat::-webkit-scrollbar-track { background: transparent; }
#chat::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }