/* ========== 基础重置 ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-card-hover: #222639;
  --bg-header: rgba(15, 17, 23, 0.85);
  --border: #2a2e3d;
  --text: #e4e6eb;
  --text-dim: #8b8fa3;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --accent: #10b981;
  --accent-hover: #34d399;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========== 顶部导航 ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.logo-icon {
  width: 24px;
  height: 24px;
}

.ui-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
  flex: 0 0 auto;
  filter: brightness(0) invert(1);
  opacity: 0.86;
}

.cover-status {
  min-height: 20px;
  color: var(--text-dim);
  font-size: 12px;
  white-space: nowrap;
}

.cover-status.error {
  color: var(--danger);
}

.is-spinning {
  animation: spin 0.8s linear infinite;
}

#btn-refresh-thumbs:disabled {
  cursor: wait;
  opacity: 0.75;
}

.header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* ========== 分类标签 ========== */
.category-bar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 57px;
  z-index: 99;
}

.category-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.cat-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: transparent;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.cat-btn:hover {
  border-color: var(--primary);
  color: var(--text);
}

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

.cat-icon {
  width: 16px;
  height: 16px;
}

/* ========== 搜索 ========== */
.search-bar {
  background: var(--bg);
  padding: 0 24px 16px;
}

.search-inner {
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.search-input::placeholder {
  color: var(--text-dim);
}

.search-input:focus {
  border-color: var(--primary);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

/* ========== 网格 ========== */
.grid-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

/* ========== 卡片 ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.card.selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow);
}

.card-preview {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #12141c;
  cursor: pointer;
  overflow: hidden;
}

.card-preview .placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 14px;
  transition: opacity var(--transition);
}

.card-preview .placeholder .cam-icon {
  width: 40px;
  height: 40px;
  opacity: 0.6;
}

/* 封面缩略图 */
.card-preview .thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.card-preview .placeholder.has-thumb {
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.7));
  z-index: 1;
}

.card-preview .placeholder.has-thumb .cam-icon {
  display: none;
}

.card-preview .placeholder.has-thumb span:last-child {
  font-weight: 600;
  text-shadow: 0 1px 4px rgba(0,0,0,0.8);
}

.card-preview .play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 2;
}

.card-preview:hover .play-overlay {
  opacity: 1;
}

.play-btn-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.play-btn-icon .ui-icon {
  width: 24px;
  height: 24px;
  opacity: 1;
}

.play-btn-icon .pause-icon {
  display: none;
}

.play-btn-icon.pause .play-icon {
  display: none;
}

.play-btn-icon.pause .pause-icon {
  display: inline-block;
}

/* 卡片内嵌视频 */
.card-preview video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
  background: #000;
}

/* 播放中状态 */
.card.playing {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow);
}

.card.playing .placeholder {
  opacity: 0;
}

.card.playing video {
  display: block;
}

.card.playing .play-overlay {
  opacity: 1;
  background: rgba(0, 0, 0, 0.15);
}

/* 加载指示器 */
.loading-indicator {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: rgba(0, 0, 0, 0.6);
  z-index: 3;
  color: #fff;
  font-size: 13px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(255,255,255,0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.card-info {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
}

.card-name {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-tag {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.tag-hls {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.tag-rtsp {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.card-actions {
  padding: 0 14px 12px;
  display: flex;
  gap: 6px;
}

.card-actions .btn {
  flex: 1;
  justify-content: center;
  font-size: 13px;
  padding: 6px 10px;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  z-index: 300;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: var(--danger);
}

/* ========== 空状态 ========== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}

.empty-state .empty-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .header-inner {
    padding: 12px 16px;
  }

  .logo {
    font-size: 16px;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .category-inner {
    padding: 10px 16px;
  }

  .search-bar {
    padding: 0 16px 12px;
  }

  .grid-container {
    padding: 0 16px 24px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .btn {
    padding: 7px 12px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
}