/* ===== CSS 变量 & 重置 ===== */
:root {
  --primary: #fb7299;
  --primary-dark: #e55a7a;
  --primary-light: #ff8eb5;
  --bg-dark: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --text-primary: #e8e8f0;
  --text-secondary: #9090a8;
  --text-muted: #606078;
  --border: #2a2a45;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --fans-color: #fb7299;
  --views-color: #00d4aa;
  --favs-color: #ffb74d;
  --likes-color: #4fc3f7;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
}

/* ===== 布局 ===== */
.app {
  display: flex;
  min-height: 100vh;
}

/* ===== 侧边栏 ===== */
.sidebar {
  width: 240px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
}

.logo {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  border-bottom: 1px solid var(--border);
}

.logo i {
  font-size: 24px;
}

.sidebar nav {
  flex: 1;
  padding: 12px 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin: 4px 0;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  font-size: 15px;
}

.nav-item:hover {
  background: rgba(251, 114, 153, 0.1);
  color: var(--text-primary);
}

.nav-item.active {
  background: linear-gradient(135deg, rgba(251, 114, 153, 0.2), rgba(0, 212, 170, 0.1));
  color: var(--primary);
  font-weight: 600;
}

.nav-item i {
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ===== 主内容 ===== */
.main-content {
  flex: 1;
  margin-left: 240px;
  padding: 0;
}

/* ===== 顶部栏 ===== */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-info img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  object-fit: cover;
}

.user-info h2 {
  font-size: 18px;
  font-weight: 600;
}

.user-info p {
  font-size: 13px;
  color: var(--text-secondary);
  max-width: 400px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.last-update {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}

.btn-refresh {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.btn-refresh:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(251, 114, 153, 0.4);
}

.btn-refresh:active {
  transform: scale(0.95);
}

/* ===== Tab 内容 ===== */
.tab-content {
  display: none;
  padding: 24px 32px;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.tab-header h2 {
  font-size: 22px;
  font-weight: 600;
}

.tab-header select {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}

/* ===== 核心指标卡片 ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.metric-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.metric-card.fans::before { background: var(--fans-color); }
.metric-card.views::before { background: var(--views-color); }
.metric-card.favs::before { background: var(--favs-color); }
.metric-card.likes::before { background: var(--likes-color); }

.metric-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.metric-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.metric-card.fans .metric-icon {
  background: rgba(251, 114, 153, 0.15);
  color: var(--fans-color);
}
.metric-card.views .metric-icon {
  background: rgba(0, 212, 170, 0.15);
  color: var(--views-color);
}
.metric-card.favs .metric-icon {
  background: rgba(255, 183, 77, 0.15);
  color: var(--favs-color);
}
.metric-card.likes .metric-icon {
  background: rgba(255, 183, 77, 0.15);
  color: var(--likes-color);
}

.metric-info {
  flex: 1;
}

.metric-label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.metric-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.metric-change {
  font-size: 13px;
  color: var(--text-muted);
  padding: 4px 8px;
  background: rgba(255,255,255,0.05);
  border-radius: 6px;
}

/* ===== 图表卡片 ===== */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.chart-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}

.chart-card.full-width {
  grid-column: 1 / -1;
}

.chart-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.chart-box {
  width: 100%;
  height: 300px;
}

/* ===== 视频/文章列表 ===== */
.video-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.video-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.video-info {
  padding: 12px 16px;
}

.video-info h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.video-stats {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.video-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== 加载遮罩 ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 15, 26, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  gap: 16px;
}

.loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== 采集状态条 ===== */
.collect-status {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 14px;
}

.collect-status .btn-collect {
  margin-left: auto;
  background: linear-gradient(135deg, var(--reads-color), #1a9fd4);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.collect-status .btn-collect:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(79, 195, 247, 0.4);
}

.collect-status .status-tag {
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.status-tag.collected {
  background: rgba(0, 212, 170, 0.15);
  color: var(--views-color);
}

.status-tag.pending {
  background: rgba(255, 183, 77, 0.15);
  color: var(--likes-color);
}

.status-tag.error {
  background: rgba(255, 82, 82, 0.15);
  color: #ff5252;
}

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .sidebar {
    width: 64px;
  }
  .sidebar .logo span,
  .sidebar .nav-item span,
  .sidebar-footer {
    display: none;
  }
  .logo {
    justify-content: center;
    padding: 20px 0;
  }
  .nav-item {
    justify-content: center;
    padding: 12px;
  }
  .main-content {
    margin-left: 64px;
  }
  .topbar {
    padding: 16px;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  .tab-content {
    padding: 16px;
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .charts-row {
    grid-template-columns: 1fr;
  }
}