CamTalk/frontend/src/App.css

/* ============================================================
   CamTalk — Web 端应用样式
   双栏布局：左侧视频面板 + 右侧聊天面板

   设计方向：深色科技极简，Ethereal Glass 美学
   字体：Inter 优先，系统字体栈兜底
   颜色：冷灰体系，单一蓝色强调色
   ============================================================ */

:root {
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-bg: #0a0a0f;
  --color-surface: #111118;
  --color-surface-2: #1a1a24;
  --color-surface-3: #22222e;
  --color-text: #d4d4dc;
  --color-text-muted: #5a5a6e;
  --color-border: #1f1f2a;
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-error: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-bg: #f4f4f8;
  --color-surface: #ffffff;
  --color-surface-2: #f0f0f5;
  --color-surface-3: #e8e8ee;
  --color-text: #111118;
  --color-text-muted: #6b6b80;
  --color-border: #dddde5;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-error: #dc2626;
}

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

html, body, #root {
  height: 100%;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-variant-numeric: tabular-nums;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- App Shell ---- */

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

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

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 8px rgba(10, 10, 15, 0.3);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.header__left {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.header__title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.header__subtitle {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
}

.header__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__stats {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  padding: 4px 12px;
  background: var(--color-surface-2);
  border-radius: 20px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.badge {
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all var(--transition-fast);
}

.badge--connected {
  color: var(--color-success);
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.badge--connecting {
  color: var(--color-warning);
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.badge--disconnected {
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}

.btn-icon {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.btn-icon:active {
  transform: scale(0.92);
}

.lang-group {
  display: flex;
  gap: 2px;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-text);
}

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

/* ---- Workspace (双栏) ---- */

.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ---- 左侧视频面板 ---- */

.video-panel {
  width: 420px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  padding: 20px;
  gap: 14px;
}

.video-container {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--color-surface-2);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast);
}

.video-container:hover {
  border-color: var(--color-surface-3);
}

.video-container .video-preview {
  width: 100%;
  height: 100%;
  border-radius: 0;
}

.video-container .video-preview__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #12121a;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 400;
}

.video-placeholder__icon {
  font-size: 2.2rem;
  opacity: 0.15;
  margin-bottom: 4px;
}

.video-indicator {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--color-success);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  animation: pulse 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

.live-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: white;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.live-badge__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

.video-indicator--loading { color: var(--color-warning); }
.video-indicator--audio { left: auto; right: 16px; color: var(--color-primary); }
.video-indicator--error { color: var(--color-error); animation: none; }

.detail-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(59, 130, 246, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: white;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.observation-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(52, 211, 153, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: white;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  animation: pulse 2s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.video-overlay__spinner {
  width: 36px;
  height: 36px;
  border: 2.5px solid rgba(255, 255, 255, 0.15);
  border-top-color: rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ---- 视频控制栏 ---- */

.video-controls {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  padding: 6px 0;
}

.video-controls__row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn--ctrl {
  padding: 7px 14px;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--ctrl:hover {
  background: var(--color-surface-3);
  color: var(--color-text);
  border-color: var(--color-surface-3);
}

.btn--ctrl:active {
  transform: translateY(1px);
}

.btn--ctrl-on {
  background: rgba(52, 211, 153, 0.1);
  color: var(--color-success);
  border-color: rgba(52, 211, 153, 0.25);
}

.btn--ctrl-on:hover {
  background: rgba(52, 211, 153, 0.18);
}

.btn--ctrl-off {
  background: rgba(248, 113, 113, 0.08);
  color: var(--color-error);
  border-color: rgba(248, 113, 113, 0.18);
}

.btn--ctrl-off:hover {
  background: rgba(248, 113, 113, 0.15);
}

.btn--speaking {
  animation: micPulse 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
  box-shadow: 0 0 12px rgba(52, 211, 153, 0.4);
}

@keyframes micPulse {
  0%, 100% { box-shadow: 0 0 8px rgba(52, 211, 153, 0.3); transform: scale(1); }
  50% { box-shadow: 0 0 18px rgba(52, 211, 153, 0.7); transform: scale(1.04); }
}

/* ---- 右侧聊天面板 ---- */

.chat-panel-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  min-width: 0;
}

.chat-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  font-weight: 600;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  color: var(--color-text-muted);
  letter-spacing: -0.01em;
}

.chat-panel-header__mode {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--color-success);
  background: rgba(52, 211, 153, 0.08);
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.02em;
}

.chat-panel-body {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ---- Chat Panel (覆盖子组件样式) ---- */

.chat-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.chat-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-panel--empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 12px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.chat-panel--empty-icon {
  font-size: 2.4rem;
  opacity: 0.12;
  margin-bottom: 4px;
}

.chat-panel--empty-hint {
  font-size: 0.75rem;
  opacity: 0.6;
  max-width: 240px;
  text-align: center;
  line-height: 1.5;
}

.chat-message {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  max-width: min(92%, 65ch);
  transition: background var(--transition-fast);
}

.chat-message:hover {
  background: var(--color-surface-3);
}

.chat-message--user {
  border-left: 2px solid var(--color-primary);
  align-self: flex-end;
  background: rgba(59, 130, 246, 0.06);
}

.chat-message--user:hover {
  background: rgba(59, 130, 246, 0.1);
}

.chat-message--assistant {
  border-left: 2px solid var(--color-success);
}

.chat-message--streaming {
  opacity: 0.85;
}

.chat-message__role {
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.chat-message__content {
  font-size: 0.82rem;
  line-height: 1.65;
  white-space: pre-wrap;
  max-width: 65ch;
}

.chat-message__meta {
  margin-top: 8px;
  font-size: 0.62rem;
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.01em;
}

/* ---- Chat Input ---- */

.chat-input {
  display: flex;
  gap: 8px;
  padding: 12px 24px 16px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat-input__field {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: 0.82rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.chat-input__field::placeholder {
  color: var(--color-text-muted);
}

.chat-input__field:focus {
  border-color: var(--color-primary);
}

.chat-input__send {
  padding: 10px 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: white;
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.chat-input__send:hover:not(:disabled) {
  opacity: 0.9;
}

.chat-input__send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

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

.cursor {
  display: inline;
  animation: blink 0.8s step-end infinite;
  color: var(--color-success);
  font-weight: 300;
}

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

.system-message {
  text-align: center;
  padding: 10px 16px;
  margin: 0 24px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
}

.system-message--warning {
  background: rgba(251, 191, 36, 0.08);
  color: var(--color-warning);
  border: 1px solid rgba(251, 191, 36, 0.15);
}

/* ---- Drawer (Config Panel) ---- */

.drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 0.25s var(--transition-smooth);
}

.drawer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  animation: slideInRight 0.35s var(--transition-smooth);
  box-shadow: -8px 0 40px rgba(10, 10, 15, 0.5);
}

.drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.drawer__title {
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: -0.01em;
}

.drawer__close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.drawer__close:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.drawer__close:active {
  transform: scale(0.92);
}

.drawer__body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

/* ---- Config Group ---- */

.config-group {
  margin-bottom: 24px;
}

.config-group__title {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.config-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 8px;
  margin: 0 -8px;
  font-size: 0.82rem;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.config-row:hover {
  background: var(--color-surface-2);
}

.config-row__info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.config-row__label {
  font-weight: 500;
  color: var(--color-text);
}

.config-row__desc {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.config-row select,
.config-row input[type="checkbox"] {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.config-row select:hover,
.config-row input[type="checkbox"]:hover {
  border-color: var(--color-surface-3);
}

.config-row select:focus,
.config-row input[type="checkbox"]:focus {
  outline: 2px solid rgba(59, 130, 246, 0.4);
  outline-offset: 1px;
}

.config-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

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

.toast-container {
  position: fixed;
  top: 72px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  animation: slideIn 0.35s var(--transition-smooth);
  max-width: 320px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(10, 10, 15, 0.4);
}

.toast--error {
  background: rgba(248, 113, 113, 0.92);
  color: white;
}

.toast--warning {
  background: rgba(251, 191, 36, 0.92);
  color: #111;
}

.toast--info {
  background: rgba(59, 130, 246, 0.92);
  color: white;
}

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

.btn {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.01em;
}

.btn:active {
  transform: translateY(1px);
}

.btn--lg {
  padding: 12px 32px;
  font-size: 0.92rem;
  border-radius: var(--radius);
}

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

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

.btn--secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-3);
  border-color: var(--color-surface-3);
}

.btn--warning {
  background: var(--color-warning);
  color: #111;
}

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

.btn--danger {
  background: rgba(248, 113, 113, 0.1);
  color: var(--color-error);
  border: 1px solid rgba(248, 113, 113, 0.2);
}

.btn--danger:hover {
  background: rgba(248, 113, 113, 0.18);
}

.btn--active {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.35);
  animation: pulseBtn 2s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

/* ---- Animations ---- */

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

@keyframes pulseBtn {
  0%, 100% { box-shadow: 0 0 12px rgba(59, 130, 246, 0.35); }
  50% { box-shadow: 0 0 22px rgba(59, 130, 246, 0.6); }
}

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

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

@keyframes slideIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* ---- Scrollbar ---- */

::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}