/* ============================================================
   同步放映室 — 主样式表
   暗色主题 + 紫蓝渐变配色 + 玻璃拟态
   ============================================================ */

/* ============================================================
   CSS 变量定义（设计 token）
   ============================================================ */
:root {
  /* 主色调 */
  --primary: #7c5cfc;
  --primary-hover: #9177ff;
  --primary-glow: rgba(124, 92, 252, 0.3);
  --accent: #00d4aa;
  --accent-hover: #00e8bb;

  /* 背景色 */
  --bg-deep: #0a0a1a;
  --bg-main: #0f0f23;
  --bg-card: rgba(22, 22, 48, 0.85);
  --bg-card-hover: rgba(30, 30, 60, 0.9);
  --bg-input: rgba(30, 30, 60, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.04);

  /* 文字色 */
  --text-primary: #e8e6f0;
  --text-secondary: #9896a8;
  --text-muted: #5c5a6e;

  /* 边框 */
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(124, 92, 252, 0.4);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* 动画 */
  --transition: 0.2s ease;
  --transition-slow: 0.35s ease;

  /* 其他 */
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
}

/* ============================================================
   全局重置与基础
   ============================================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-deep);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   页面切换
   ============================================================ */
.screen {
  display: none;
  width: 100%;
  height: 100%;
}

.screen.active {
  display: flex;
}

/* ============================================================
   首屏 — 大厅
   ============================================================ */
#lobby {
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(124, 92, 252, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(0, 212, 170, 0.08) 0%, transparent 50%),
    var(--bg-deep);
}

.lobby-container {
  width: 100%;
  max-width: 420px;
  padding: 48px 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.5s ease;
}

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

/* Logo 和标题 */
.lobby-header {
  text-align: center;
  margin-bottom: 32px;
}

.logo-icon {
  font-size: 48px;
  margin-bottom: 12px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.lobby-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 输入框组 */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-group input,
input[type="text"] {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.input-group input:focus,
input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

input::placeholder {
  color: var(--text-muted);
}

/* Tab 切换 */
.lobby-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 20px;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

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

.tab-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

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

/* 按钮 */
.primary-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), #6344e0);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-btn:hover {
  background: linear-gradient(135deg, var(--primary-hover), #7a5cf0);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--primary-glow);
}

.primary-btn:active {
  transform: translateY(0);
}

.accent-btn {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--accent), #00b894);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.accent-btn:hover {
  background: linear-gradient(135deg, var(--accent-hover), #00d4aa);
  transform: translateY(-1px);
}

.small-btn {
  padding: 8px 14px;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.icon-btn {
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

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

.btn-icon {
  font-size: 1.1rem;
}

/* 错误提示 */
.error-msg {
  margin-top: 16px;
  padding: 10px 14px;
  background: rgba(255, 71, 87, 0.15);
  border: 1px solid rgba(255, 71, 87, 0.3);
  border-radius: var(--radius-sm);
  color: #ff6b7a;
  font-size: 0.85rem;
  text-align: center;
}

/* ============================================================
   房间页 — 整体布局
   ============================================================ */
#room {
  flex-direction: column;
  background: var(--bg-main);
}

/* 顶部信息栏 */
#room-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.room-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.room-label {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.room-id-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--primary);
  font-family: 'Courier New', monospace;
}

.copy-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  opacity: 0.5;
  transition: var(--transition);
}

.copy-btn:hover {
  opacity: 1;
  transform: scale(1.1);
}

.online-badge {
  font-size: 0.85rem;
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 170, 0.2);
}

/* 主内容 */
#main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ============================================================
   播放器区域
   ============================================================ */
#player-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* 视频容器 */
#video-container {
  position: relative;
  flex: 1;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#video-player {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

/* 无视频占位 */
#player-placeholder {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  pointer-events: none;
}

#player-placeholder.hidden {
  display: none;
}

.placeholder-icon {
  font-size: 64px;
  opacity: 0.3;
}

#player-placeholder p {
  font-size: 1rem;
}

.placeholder-hint {
  font-size: 0.8rem !important;
  opacity: 0.6;
}

/* 播放器控制栏 */
#player-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  padding: 30px 16px 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

#video-container:hover #player-controls,
#player-controls.always-show {
  opacity: 1;
}

/* 进度条 */
.progress-container {
  padding: 8px 0;
  cursor: pointer;
}

.progress-bar {
  position: relative;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  transition: height 0.15s ease;
}

.progress-container:hover .progress-bar {
  height: 6px;
}

.progress-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  position: relative;
}

.progress-handle {
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%) scale(0);
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s ease;
}

.progress-container:hover .progress-handle {
  transform: translateY(-50%) scale(1);
}

/* 控制按钮行 */
.controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
}

.controls-left,
.controls-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctrl-btn {
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  line-height: 1;
}

.ctrl-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

.time-display {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  font-variant-numeric: tabular-nums;
  font-family: 'Courier New', monospace;
}

/* 音量控制 */
.volume-control {
  display: flex;
  align-items: center;
  gap: 6px;
}

.volume-slider {
  width: 70px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: #fff;
  border-radius: 50%;
  cursor: pointer;
}

/* 播放速度选择 */
.speed-select {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: #fff;
  padding: 3px 6px;
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
}

.speed-select option {
  background: #1a1a2e;
  color: #fff;
}

/* 视频 URL 输入区 */
#video-input-area {
  padding: 12px 16px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.video-input-row {
  display: flex;
  gap: 10px;
}

.video-input-row input {
  flex: 1;
}

/* ============================================================
   侧面板
   ============================================================ */
#side-panel {
  width: 320px;
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

/* 侧面板标签 */
.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-tab {
  flex: 1;
  padding: 12px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.panel-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.panel-tab:not(.active):hover {
  color: var(--text-secondary);
}

.unread-badge {
  position: absolute;
  top: 6px;
  right: 10px;
  background: #ff4757;
  color: #fff;
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 10px;
  min-width: 16px;
  text-align: center;
}

/* 面板内容 */
.panel-content {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
}

.panel-content.active {
  display: flex;
}

/* ---- 选集面板 ---- */
.panel-section {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.episode-add-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.episode-add-form input {
  font-size: 0.85rem;
  padding: 8px 12px;
}

.episode-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.episode-list::-webkit-scrollbar {
  width: 4px;
}

.episode-list::-webkit-scrollbar-track {
  background: transparent;
}

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

.episode-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 4px;
}

.episode-item:hover {
  background: var(--bg-glass);
}

.episode-item.active {
  background: var(--primary-glow);
  border: 1px solid rgba(124, 92, 252, 0.3);
}

.episode-num {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  min-width: 24px;
}

.episode-title {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.episode-delete {
  opacity: 0;
  background: transparent;
  border: none;
  color: #ff4757;
  cursor: pointer;
  font-size: 0.8rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.episode-item:hover .episode-delete {
  opacity: 0.6;
}

.episode-delete:hover {
  opacity: 1 !important;
  background: rgba(255, 71, 87, 0.15);
}

.empty-hint {
  text-align: center;
  color: var(--text-muted);
  padding: 32px 16px;
  font-size: 0.85rem;
}

/* ---- 成员面板 ---- */
.user-list {
  padding: 12px;
  flex: 1;
  overflow-y: auto;
}

.user-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  flex-shrink: 0;
}

.user-name {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.user-badge {
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: auto;
}

/* ---- 聊天面板 ---- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

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

.chat-msg {
  margin-bottom: 12px;
  animation: fadeIn 0.2s ease;
}

.chat-msg-header {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 2px;
}

.chat-username {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
}

.chat-time {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.chat-text {
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.4;
  word-break: break-word;
}

/* 系统消息 */
.chat-system {
  text-align: center;
  padding: 4px 0;
  margin-bottom: 8px;
}

.chat-system span {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-glass);
  padding: 3px 10px;
  border-radius: 10px;
}

/* 聊天输入 */
.chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.chat-input-area input {
  flex: 1;
  padding: 8px 12px;
  font-size: 0.85rem;
}

/* ============================================================
   Toast 通知
   ============================================================ */
#toast-container {
  position: fixed;
  top: 70px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
  max-width: 300px;
  backdrop-filter: blur(10px);
}

.toast.success {
  border-color: rgba(0, 212, 170, 0.4);
  color: var(--accent);
}

.toast.error {
  border-color: rgba(255, 71, 87, 0.4);
  color: #ff6b7a;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateX(40px);
  }
}

/* ============================================================
   响应式布局 — 手机适配
   ============================================================ */
@media (max-width: 768px) {
  .lobby-container {
    max-width: 90vw;
    padding: 32px 24px;
  }

  #main-content {
    flex-direction: column;
  }

  #side-panel {
    width: 100%;
    height: 280px;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .volume-slider {
    width: 50px;
  }

  #room-header {
    padding: 8px 12px;
  }

  .room-id-text {
    font-size: 0.95rem;
  }
}

/* ============================================================
   全屏状态下隐藏侧面板和头部
   ============================================================ */
#video-container:fullscreen #player-controls,
#video-container:-webkit-full-screen #player-controls {
  opacity: 1;
}

/* ============================================================
   滚动条整体美化
   ============================================================ */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}