/* ============================================================
   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;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

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

.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;
}

.vad-indicator--audio {
  left: auto;
  right: 12px;
  color: var(--color-primary);
}

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

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

/* ---- 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;
  overflow-y: auto;
  flex: 1;
}

.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);
}

/* ---- Stats Bar ---- */

.stats-bar {
  text-align: center;
  padding: 4px 0;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  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;
}

.btn--active {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 0 8px rgba(37, 99, 235, 0.5);
  animation: pulseBtn 2s ease-in-out infinite;
}

@keyframes pulseBtn {
  0%, 100% { box-shadow: 0 0 8px rgba(37, 99, 235, 0.5); }
  50% { box-shadow: 0 0 16px rgba(37, 99, 235, 0.8); }
}

/* ---- Streaming Cursor ---- */

.cursor {
  display: inline;
  animation: blink 0.8s step-end infinite;
  color: var(--color-success);
}

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

/* ---- Message Meta ---- */

.chat-message__meta {
  margin-top: 6px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ---- System Message ---- */

.system-message {
  text-align: center;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.85rem;
}

.system-message--warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ---- Toast ---- */

.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
  animation: slideIn 0.3s ease-out;
  max-width: 320px;
}

.toast--error {
  background: rgba(239, 68, 68, 0.9);
  color: white;
}

.toast--warning {
  background: rgba(245, 158, 11, 0.9);
  color: #000;
}

.toast--info {
  background: rgba(37, 99, 235, 0.9);
  color: white;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---- Video Overlay ---- */

.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}

.video-overlay__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Config Panel ---- */

.config-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 8px 0;
}

.config-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-weight: 600;
}

.config-panel__close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
}

.config-panel__close:hover {
  color: var(--color-text);
}

.config-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-size: 0.9rem;
}

.config-row select,
.config-row input[type="checkbox"] {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.85rem;
}

/* ---- Detail Badge ---- */

.detail-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(37, 99, 235, 0.8);
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.observation-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(34, 197, 94, 0.8);
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  animation: pulse 2s ease-in-out infinite;
}