/* ============================================================
   CamTalk — 主应用样式
   ============================================================ */

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --radius: 8px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---- Header ---- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.status {
  font-size: 0.85rem;
  padding: 4px 12px;
  border-radius: 12px;
  background: var(--color-surface);
}

.status--connected {
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.status--connecting {
  color: var(--color-warning);
  border: 1px solid var(--color-warning);
}

.status--disconnected {
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

/* ---- Main ---- */

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px 0;
  overflow: hidden;
}

.video-section {
  position: relative;
  flex-shrink: 0;
}

.vad-indicator {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.7);
  color: var(--color-success);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  animation: pulse 1.5s ease-in-out infinite;
}

.vad-indicator--loading {
  color: var(--color-warning);
}

.vad-indicator--error {
  color: var(--color-error);
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.chat-section {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---- Video Preview ---- */

.video-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.video-preview__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-preview__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

/* ---- Chat Panel ---- */

.chat-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-panel--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 0;
  color: var(--color-text-muted);
}

.chat-message {
  padding: 12px 16px;
  border-radius: var(--radius);
  background: var(--color-surface);
}

.chat-message--user {
  border-left: 3px solid var(--color-primary);
}

.chat-message--assistant {
  border-left: 3px solid var(--color-success);
}

.chat-message--streaming {
  opacity: 0.8;
}

.chat-message__role {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.chat-message__content {
  font-size: 0.95rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

/* ---- Footer ---- */

.app-footer {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
}

/* ---- Buttons ---- */

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-border);
}

.btn--warning {
  background: var(--color-warning);
  color: #000;
}

.btn--warning:hover {
  opacity: 0.9;
}