/* ==========================================================================
   tabs.css — Tab bar, tab buttons, tab content area, transitions
   UI/UX Pro Max — Horizontal tab navigation with indigo indicator
   ========================================================================== */

/* ---------- Tab Bar ---------- */
#tab-bar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

/* --- Top bars hide (header + tab bar) --- */
#main-content.top-hidden #app-header,
#main-content.top-hidden #tab-bar {
  display: none;
}

.tab-bar-inner {
  display: flex;
  align-items: stretch;
  gap: var(--space-xs);
  padding: 0 var(--space-xl);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Hide scrollbar on tab bar */
.tab-bar-inner::-webkit-scrollbar {
  display: none;
}

.tab-bar-inner {
  scrollbar-width: none;
}

/* ---------- Tab Button ---------- */
.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: #6B7280;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
  position: relative;
  user-select: none;
  margin-bottom: -1px;
  min-height: var(--tab-bar-height);
}

.tab-btn svg {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text);
  background: #F3F4F6;
  border-radius: var(--radius) var(--radius) 0 0;
}

.tab-btn:hover svg {
  opacity: 0.75;
}

.tab-btn:focus-visible {
  box-shadow: 0 0 0 2px var(--primary-100), 0 0 0 4px var(--primary-500);
  border-radius: var(--radius) var(--radius) 0 0;
}

.tab-btn:active {
  background: var(--gray-100);
}

.tab-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Active tab — indigo text + 2px indigo border-bottom + 600 weight */
.tab-btn.active {
  color: #4F46E5;
  border-bottom-color: #4F46E5;
  font-weight: 600;
}

.tab-btn.active svg {
  opacity: 1;
  color: #4F46E5;
}

/* Tab badge / notification dot */
.tab-btn .tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-size: 10px;
  font-weight: 600;
  background: var(--danger-500);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  line-height: 1;
}

/* ---------- Tab Content ---------- */
#tab-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  background: var(--bg);
}

/* HTMX loading state */
#tab-content.htmx-request {
  opacity: 0.5;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

/* Loading indicator */
.htmx-indicator {
  display: none;
}

.htmx-request .htmx-indicator,
.htmx-indicator.htmx-request {
  display: inline-flex;
}

/* ---------- Tab Loading Pulse ---------- */
.tab-loading {
  animation: tab-pulse 1.5s ease-in-out infinite;
}

@keyframes tab-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- Tab Content Sections ---------- */
.tab-section {
  margin-bottom: var(--space-xl);
}

.tab-section-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-light);
}

/* ---------- Tab Pane Fade-in ---------- */
.tab-pane {
  animation: tab-fade-in 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes tab-fade-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .tab-bar-inner {
    padding: 0 var(--space-lg);
  }

  .tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-xs);
  }

  .tab-btn svg {
    display: none;
  }

  #tab-content {
    padding: var(--space-lg);
  }
}

/* ==========================================================================
   Tab 1: Classify — input, results, footer
   ========================================================================== */

/* --- Modal backdrop/dialog (aliases for modal-overlay/modal) --- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: modal-overlay-in 0.2s ease;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-dialog {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 560px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  animation: modal-slide-in 0.25s cubic-bezier(0.21, 1.02, 0.73, 1);
}

/* --- Form actions bar --- */
.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding-top: var(--space-md);
}

/* --- 輸入區 input-with-action --- */
.input-with-action {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.input-with-action .form-input {
  flex: 1;
}

/* --- 分類結果卡片 --- */
.classify-result-card {
  margin-top: var(--space-sm);
  transition: box-shadow var(--transition-fast);
}

.classify-result-card:hover {
  box-shadow: var(--shadow-md);
}

.classify-result-card .expander-header {
  padding: 14px 16px;
}

.classify-result-card .expander-title {
  font-weight: 600;
  font-size: var(--text-base);
  flex: 1;
}

.classify-result-card .result-index {
  font-size: var(--text-xs);
  min-width: 24px;
  text-align: center;
}

/* 段落內部各區塊分隔 */
.classify-result-card .expander-body > .form-group + .form-group {
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}

/* 段落工具列（歸屬專案 + 刪除按鈕） */
.classify-card-toolbar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}
.classify-card-toolbar .form-group {
  flex: 1;
  margin-bottom: 0;
}
.classify-card-toolbar .btn {
  flex-shrink: 0;
  margin-bottom: 2px;
}

.form-actions-right {
  display: flex;
  justify-content: flex-end;
}

/* Section labels */
.classify-section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

/* --- 待辦列 --- */
.classify-todo-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.classify-todo-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.classify-todo-row:hover {
  background: var(--gray-50);
}

.classify-todo-row .classify-todo-done {
  flex-shrink: 0;
}

.classify-todo-row .classify-todo-done:checked + .classify-todo-content {
  text-decoration: line-through;
  color: var(--text-muted);
}

.classify-assignee-wrap {
  min-width: 210px;
  max-width: 320px;
  position: relative;
}

.classify-assignee-wrap select[multiple] {
  height: 32px;
  font-size: var(--text-xs);
  padding: 2px 4px;
}

.classify-assignee-wrap .ss-wrapper {
  width: 100%;
}

.classify-assignee-wrap .ss-trigger {
  min-height: 32px;
  font-size: var(--text-xs);
}

/* --- 關鍵字列表（三欄） --- */
.classify-keywords-list,
.obs-kw-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xs);
}

.classify-kw-row,
.obs-kw-row {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 6px;
  min-width: 0;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.classify-kw-row:hover,
.obs-kw-row:hover {
  background: var(--gray-50);
}

.classify-kw-word,
.obs-kw-word {
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--primary-600);
}

.classify-kw-owner-wrap,
.obs-kw-owner-wrap {
  flex: 1;
  min-width: 0;
  position: relative;
}

.classify-kw-owner-wrap select[multiple],
.obs-kw-owner-wrap select[multiple] {
  height: 28px;
  font-size: var(--text-xs);
  padding: 2px 4px;
}

.classify-kw-owner-wrap .ss-wrapper,
.obs-kw-owner-wrap .ss-wrapper {
  width: 100%;
}

.classify-kw-owner-wrap .ss-trigger,
.obs-kw-owner-wrap .ss-trigger {
  min-height: 28px;
  font-size: var(--text-xs);
}

/* 新增關鍵字列 — 跨三欄 */
.classify-kw-add-row,
.obs-kw-add-row {
  grid-column: 1 / -1;
}

/* --- 新增段落按鈕 --- */
.classify-add-block-wrap {
  display: flex;
  justify-content: center;
  padding: var(--space-md) 0;
}
.classify-add-block-wrap .btn {
  border-style: dashed;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}
.classify-add-block-wrap .btn:hover {
  color: var(--primary-500);
  border-color: var(--primary-300);
  background: var(--primary-50);
}

/* --- 底部操作列（sticky） --- */
.classify-actions-bar {
  position: sticky;
  bottom: 0;
  background: var(--surface);
  border-top: 1px solid var(--border-light);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) calc(-1 * var(--space-lg)) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  z-index: 10;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.06);
}
.classify-actions-bar .form-actions {
  margin: 0;
  gap: var(--space-sm);
}

/* --- 底部資訊 --- */
.classify-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0 0;
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border-light);
}

.classify-footer-item {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.classify-footer-mtime {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: right;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .classify-todo-row {
    flex-wrap: wrap;
  }
  .classify-assignee-wrap {
    min-width: 100%;
  }
  .classify-keywords-list,
  .obs-kw-list {
    grid-template-columns: 1fr;
  }
  .classify-card-toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  .classify-actions-bar {
    flex-direction: column;
  }
}

/* ==========================================================================
   Loading / Processing Animations
   ========================================================================== */

/* --- Spinner (通用旋轉圓圈) --- */
.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

/* --- Processing card (分類 / AI 處理中) --- */
.processing-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
}

.processing-card .card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.processing-card .spinner {
  width: 48px;
  height: 48px;
  border-width: 4px;
  border-color: var(--primary-100);
  border-top-color: var(--primary-500);
}

.processing-card p {
  margin: 0;
}

/* 脈動光暈效果 */
.processing-card .spinner {
  animation: spin 0.7s linear infinite, pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.2); }
  50%      { box-shadow: 0 0 0 12px rgba(99, 102, 241, 0); }
}

/* 狀態文字淡入淡出 */
.processing-card p:first-of-type {
  font-weight: 500;
  color: var(--text);
  animation: fade-pulse 2.5s ease-in-out infinite;
}

@keyframes fade-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

/* --- Loading indicator (macro 用) --- */
.loading-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.loading-indicator .spinner {
  width: 18px;
  height: 18px;
  border-width: 2px;
}