/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  color: #1f2937;
  background: #f7f8fa;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select { font-family: inherit; font-size: inherit; color: inherit; }

/* ===== Layout ===== */
.app {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
  background: #1a1d23;
  color: #d1d5db;
  padding: 20px 16px;
  overflow-y: auto;
  border-right: 1px solid #0f1115;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: #2d3139; border-radius: 3px; }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid #2d3139;
  margin-bottom: 20px;
}
.logo {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.3px;
}
.refresh-btn {
  color: #9ca3af;
  padding: 6px;
  border-radius: 6px;
  display: flex;
  transition: all .15s;
}
.refresh-btn:hover { background: #2d3139; color: #fff; }

.sidebar-section { margin-bottom: 20px; }
.section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: #6b7280;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  padding: 0 4px;
}

.date-display {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: #2d3139;
  border-radius: 6px;
  font-size: 12px;
  color: #d1d5db;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  color: #d1d5db;
  transition: all .15s;
}
.sidebar-link:hover { background: #2d3139; color: #fff; }

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #2d3139;
  border: 1px solid #3d4149;
  border-radius: 6px;
  padding: 8px 10px;
}
.search-box svg { color: #9ca3af; flex-shrink: 0; }
.search-box input {
  background: none;
  border: none;
  outline: none;
  color: #fff;
  width: 100%;
  font-size: 12.5px;
}
.search-box input::placeholder { color: #6b7280; }

.category-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.category-item {
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  color: #d1d5db;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all .15s;
}
.category-item:hover { background: #2d3139; color: #fff; }
.category-item.active {
  background: #3b82f6;
  color: #fff;
  font-weight: 500;
}
.category-count {
  font-size: 10.5px;
  color: #6b7280;
  background: #1a1d23;
  padding: 1px 6px;
  border-radius: 10px;
}
.category-item.active .category-count { background: rgba(0,0,0,0.25); color: #fff; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 4px;
}
.tag-item {
  font-size: 11px;
  padding: 4px 9px;
  background: #2d3139;
  border-radius: 12px;
  cursor: pointer;
  transition: all .15s;
}
.tag-item:hover { background: #3b82f6; color: #fff; }

/* ===== Main Content ===== */
.main-content {
  overflow-y: auto;
  background: #f7f8fa;
  position: relative;
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-tabs { display: flex; }
.nav-tab {
  padding: 14px 18px;
  font-size: 13px;
  color: #6b7280;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all .15s;
}
.nav-tab:hover { color: #1f2937; }
.nav-tab.active {
  color: #3b82f6;
  border-bottom-color: #3b82f6;
}
.api-settings-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: #f3f4f6;
  border-radius: 6px;
  font-size: 12.5px;
  color: #4b5563;
  font-weight: 500;
  transition: all .15s;
}
.api-settings-btn:hover { background: #e5e7eb; }

.tab-content { display: none; padding: 24px; }
.tab-content.active { display: block; }

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-left h2 {
  font-size: 18px;
  font-weight: 700;
  color: #1f2937;
}
.result-count {
  font-size: 12px;
  color: #6b7280;
  background: #fff;
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
}
.header-right { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.sort-group, .filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #6b7280;
}
.sort-group select, .filter-group select {
  padding: 6px 10px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  background: #fff;
  outline: none;
  cursor: pointer;
  font-size: 12px;
}
.sort-group select:focus, .filter-group select:focus { border-color: #3b82f6; }

.badge {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 10px;
  font-weight: 500;
}
.badge-info { background: #dbeafe; color: #1e40af; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 500;
  transition: all .15s;
}
.btn-primary { background: #3b82f6; color: #fff; }
.btn-primary:hover { background: #2563eb; }
.btn-outline { background: #fff; color: #4b5563; border: 1px solid #d1d5db; }
.btn-outline:hover { background: #f9fafb; border-color: #9ca3af; }
.btn-sm { padding: 5px 10px; font-size: 11.5px; }

/* ===== Video Cards ===== */
.video-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.video-card {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  transition: all .2s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.video-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  border-color: #d1d5db;
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  background: #f3f4f6;
  overflow: hidden;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.85);
  color: #fff;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
}
.video-score-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 6px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}
.video-score-badge.viral { background: #dc2626; }
.video-score-badge.great { background: #ea580c; }
.video-score-badge.good { background: #ca8a04; }
.video-score-badge.normal { background: #4b5563; }

.video-body { padding: 12px 14px 14px; flex: 1; display: flex; flex-direction: column; }
.video-title {
  font-size: 13px;
  font-weight: 600;
  color: #1f2937;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
  min-height: 36px;
}
.video-channel {
  font-size: 11.5px;
  color: #6b7280;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.video-channel:hover { color: #3b82f6; }
.video-stats {
  display: flex;
  gap: 10px;
  font-size: 11px;
  color: #6b7280;
  padding-top: 10px;
  border-top: 1px solid #f3f4f6;
  margin-top: auto;
}
.video-stat { display: flex; align-items: center; gap: 3px; }
.video-stat svg { flex-shrink: 0; }
.video-stat.highlight { color: #3b82f6; font-weight: 600; }

.video-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  border-top: 1px solid #f3f4f6;
  background: #fafbfc;
}
.video-action-btn {
  padding: 5px 8px;
  font-size: 11px;
  color: #6b7280;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all .15s;
}
.video-action-btn:hover { background: #f3f4f6; color: #1f2937; }
.video-action-btn.active { color: #3b82f6; }

.save-channel-btn {
  padding: 3px 6px;
  border-radius: 4px;
  color: #d1d5db;
  transition: all .15s;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.save-channel-btn:hover { color: #f59e0b; background: #fef3c7; }
.save-channel-btn.active { color: #f59e0b; }
.save-channel-btn.active svg { fill: #f59e0b; }

.video-channel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 10px;
}
.video-channel-row .video-channel { margin-bottom: 0; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ===== Saved Channels ===== */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.saved-channel-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 18px;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.saved-channel-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  border-color: #d1d5db;
}
.saved-channel-header {
  display: flex;
  gap: 12px;
  align-items: center;
}
.saved-channel-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  overflow: hidden;
  background: #f3f4f6;
  flex-shrink: 0;
}
.saved-channel-avatar img { width: 100%; height: 100%; object-fit: cover; }
.saved-channel-meta {
  flex: 1;
  min-width: 0;
}
.saved-channel-name {
  font-size: 13.5px;
  font-weight: 700;
  color: #1f2937;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}
.saved-channel-subs {
  font-size: 11.5px;
  color: #6b7280;
}
.saved-channel-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid #f3f4f6;
}
.mini-stat {
  text-align: center;
}
.mini-stat-label {
  font-size: 10.5px;
  color: #9ca3af;
  margin-bottom: 2px;
}
.mini-stat-value {
  font-size: 14px;
  font-weight: 600;
  color: #1f2937;
}
.saved-channel-actions {
  display: flex;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid #f3f4f6;
}
.saved-channel-actions .btn-mini {
  flex: 1;
  padding: 6px 10px;
  font-size: 11.5px;
  border-radius: 5px;
  background: #f9fafb;
  color: #4b5563;
  transition: all .15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.saved-channel-actions .btn-mini:hover { background: #eff6ff; color: #3b82f6; }
.saved-channel-actions .btn-mini.danger:hover { background: #fef2f2; color: #dc2626; }
.saved-date {
  font-size: 10.5px;
  color: #9ca3af;
}

/* ===== Empty State ===== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: #9ca3af;
}
.empty-icon { margin-bottom: 20px; }
.empty-state h3 {
  font-size: 16px;
  color: #4b5563;
  margin-bottom: 8px;
}
.empty-state p {
  font-size: 13px;
  line-height: 1.7;
}
.empty-state a { color: #3b82f6; text-decoration: underline; }

/* ===== Outlier Tab ===== */
.outlier-explanation { margin-bottom: 20px; }
.explanation-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 20px;
}
.explanation-card h3 {
  font-size: 14px;
  margin-bottom: 8px;
  color: #1f2937;
}
.explanation-card p {
  font-size: 12.5px;
  color: #4b5563;
  line-height: 1.7;
  margin-bottom: 14px;
}
.explanation-card .highlight {
  color: #dc2626;
  font-weight: 700;
}
.score-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12px;
  color: #4b5563;
}
.scale-item { display: flex; align-items: center; gap: 6px; }
.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-normal { background: #4b5563; }
.dot-good { background: #ca8a04; }
.dot-great { background: #ea580c; }
.dot-viral { background: #dc2626; }

/* ===== Channel Tab ===== */
.channel-search-area {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.channel-input-group {
  display: flex;
  gap: 10px;
}
.channel-input-group input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  outline: none;
  font-size: 13px;
}
.channel-input-group input:focus { border-color: #3b82f6; }

.channel-info-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 20px;
}
.channel-info-header {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
}
.channel-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
  background: #f3f4f6;
  flex-shrink: 0;
}
.channel-avatar img { width: 100%; height: 100%; object-fit: cover; }
.channel-info-meta h3 {
  font-size: 18px;
  margin-bottom: 4px;
}
.channel-info-meta p {
  font-size: 12.5px;
  color: #6b7280;
  line-height: 1.5;
}
.channel-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.metric-box {
  background: #f9fafb;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid #f3f4f6;
}
.metric-label {
  font-size: 11px;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 4px;
}
.metric-value {
  font-size: 18px;
  font-weight: 700;
  color: #1f2937;
}

/* ===== Settings Tab ===== */
.settings-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 28px;
  max-width: 720px;
}
.settings-card h3 {
  font-size: 15px;
  margin-bottom: 6px;
}
.settings-desc {
  font-size: 12.5px;
  color: #6b7280;
  margin-bottom: 18px;
}
.api-key-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: #4b5563;
  margin-bottom: 6px;
}
.input-with-btn {
  display: flex;
  gap: 8px;
}
.input-with-btn input {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  outline: none;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 12.5px;
}
.input-with-btn input:focus { border-color: #3b82f6; }

.api-status {
  margin-top: 12px;
  font-size: 12px;
  padding: 8px 12px;
  border-radius: 6px;
  display: none;
}
.api-status.success { display: block; background: #d1fae5; color: #065f46; }
.api-status.error { display: block; background: #fee2e2; color: #991b1b; }

.api-guide {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid #f3f4f6;
}
.api-guide h4 { font-size: 13px; margin-bottom: 10px; }
.api-guide ol {
  margin-left: 18px;
  font-size: 12.5px;
  color: #4b5563;
  line-height: 1.9;
}
.api-guide a { color: #3b82f6; text-decoration: underline; }

.quota-info { margin-top: 24px; padding-top: 20px; border-top: 1px solid #f3f4f6; }
.quota-info h4 { font-size: 13px; margin-bottom: 10px; }
.quota-bar {
  height: 8px;
  background: #f3f4f6;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}
.quota-used {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #60a5fa);
  transition: width .3s;
}
.quota-text { font-size: 12px; color: #6b7280; }

/* ===== Loading ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.9);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  z-index: 1000;
  backdrop-filter: blur(4px);
}
.loading-overlay.active { display: flex; }
.loading-spinner {
  width: 42px;
  height: 42px;
  border: 3px solid #e5e7eb;
  border-top-color: #3b82f6;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; font-weight: 500; color: #1f2937; }
.loading-subtext { font-size: 11.5px; color: #6b7280; }

.load-more-container { text-align: center; margin-top: 24px; }
.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: #fff;
  border: 1px solid #d1d5db;
  border-radius: 20px;
  font-size: 12.5px;
  color: #4b5563;
  font-weight: 500;
  transition: all .15s;
}
.load-more-btn:hover { background: #f9fafb; border-color: #3b82f6; color: #3b82f6; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}