/* ==========================================================================
   Design Tokens & Modern CSS Variables
   ========================================================================== */
:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --bg-glass-card: rgba(31, 41, 55, 0.65);
  --bg-glass-hover: rgba(55, 65, 81, 0.7);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-focus: rgba(99, 102, 241, 0.5);
  --border-glow: 0 0 20px rgba(99, 102, 241, 0.25);

  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent-primary: #6366f1; /* Indigo */
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #06b6d4; /* Cyan */
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
  --accent-gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);

  --success-bg: rgba(16, 185, 129, 0.15);
  --success-text: #34d399;
  --success-border: rgba(16, 185, 129, 0.3);

  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-text: #fbbf24;
  --warning-border: rgba(245, 158, 11, 0.3);

  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-text: #f87171;
  --danger-border: rgba(239, 68, 68, 0.3);

  --info-bg: rgba(59, 130, 246, 0.15);
  --info-text: #60a5fa;
  --info-border: rgba(59, 130, 246, 0.3);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);

  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', var(--font-family);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-card: rgba(241, 245, 249, 0.8);
  --bg-glass-hover: rgba(226, 232, 240, 0.9);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-focus: rgba(99, 102, 241, 0.4);
  --border-glow: 0 0 20px rgba(99, 102, 241, 0.15);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(at 10% 15%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
    radial-gradient(at 90% 85%, rgba(6, 182, 212, 0.12) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 1px solid var(--border-color);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ==========================================================================
   Header & Navbar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  background: var(--accent-primary);
  color: white;
  border-radius: 999px;
  text-transform: uppercase;
  margin-left: 0.4rem;
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-secondary);
  padding: 0.3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.1rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.tab-btn.active {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
  border-color: var(--border-color-focus);
}

/* ==========================================================================
   Main Layout & Containers
   ========================================================================== */
.main-content {
  flex: 1;
  max-width: 1500px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Hero / Header Sections
   ========================================================================== */
.section-header {
  margin-bottom: 2rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ==========================================================================
   Dropzone & Upload Area
   ========================================================================== */
.dropzone-container {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
}

.dropzone-container:hover,
.dropzone-container.dragover {
  border-color: var(--accent-primary);
  background: var(--bg-glass-hover);
  box-shadow: var(--border-glow);
  transform: translateY(-2px);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  background: var(--accent-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
  animation: pulseFloat 3s infinite ease-in-out;
}

@keyframes pulseFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.dropzone-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.dropzone-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.file-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--accent-secondary);
}

/* ==========================================================================
   Stat Cards Grid
   ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-color-focus);
  box-shadow: var(--shadow-md);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-gradient);
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-secondary);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ==========================================================================
   Data Table & Action Bar
   ========================================================================== */
.table-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 2rem;
}

.table-toolbar {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 250px;
  max-width: 400px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.4rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--border-glow);
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-color-focus);
}

.btn-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
  transform: translateY(-1px);
}

.filter-pills {
  display: flex;
  gap: 0.5rem;
}

.filter-pill {
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.filter-pill.active,
.filter-pill:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* Table styles */
.table-responsive {
  overflow-x: auto;
  max-height: 600px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.data-table th {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table th.new-col-header {
  background: rgba(99, 102, 241, 0.2);
  color: #818cf8;
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  white-space: nowrap;
}

.data-table tr:hover td {
  background-color: var(--bg-glass-hover);
}

.data-table td.new-col-cell {
  background-color: rgba(99, 102, 241, 0.04);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-border);
}

.badge-info {
  background: var(--info-bg);
  color: var(--info-text);
  border: 1px solid var(--info-border);
}

.badge-muted {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

/* ==========================================================================
   Rules & AI Playground
   ========================================================================== */
.playground-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .playground-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.test-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  outline: none;
}

.test-input:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--border-glow);
}

.quick-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.quick-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--accent-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.quick-tag:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.result-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
}

.result-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  font-size: 0.9rem;
}

.result-row:last-child {
  margin-bottom: 0;
}

.result-label {
  color: var(--text-secondary);
}

.result-val {
  font-weight: 600;
  color: var(--text-primary);
}

/* Category Selector in table */
.cat-select {
  padding: 0.35rem 0.6rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.82rem;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
  max-width: 210px;
}

.cat-select:focus,
.cat-select:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.25);
}

.cat-select.unconfirmed {
  border-color: rgba(245, 158, 11, 0.5);
  background: rgba(245, 158, 11, 0.05);
}

.cat-cell-wrapper {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-confirm-row {
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
}

.btn-confirm-row:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.btn-confirm-row.confirmed {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}

/* 表格單筆刪除按鈕 */
.btn-table-delete {
  padding: 0.32rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.08);
  color: #ef4444;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-table-delete:hover {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
  transform: translateY(-1px);
}

.btn-table-delete svg,
.btn-table-delete i {
  width: 13px;
  height: 13px;
}

/* 表格操作按鈕群組與手動編輯按鈕 */
.table-action-btns {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.btn-table-edit {
  padding: 0.32rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid rgba(99, 102, 241, 0.35);
  background: rgba(99, 102, 241, 0.1);
  color: #818cf8;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-table-edit:hover {
  background: #6366f1;
  color: #ffffff;
  border-color: #6366f1;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.btn-table-edit svg,
.btn-table-edit i {
  width: 13px;
  height: 13px;
}

/* 彈窗表單通用樣式 */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-label-required {
  color: #ef4444;
  margin-left: 0.25rem;
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
  box-sizing: border-box;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--border-glow);
}

.form-input[readonly],
.form-input:disabled {
  opacity: 0.75;
  background: rgba(15, 23, 42, 0.5);
  cursor: not-allowed;
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.form-hint {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.2rem;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

@media (max-width: 600px) {
  .form-grid-2 {
    grid-template-columns: 1fr;
  }
}

/* Modals & Toast */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content,
.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  max-width: 550px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: var(--transition);
}

.modal-overlay.active .modal-content,
.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
}

.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  min-width: 280px;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  background-color: var(--bg-secondary);
}

/* ==========================================================================
   Login Screen & Auth Gate Styles
   ========================================================================== */
.login-screen-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(17, 24, 39, 0.97) 0%, rgba(11, 15, 25, 0.99) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1.5rem;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

[data-theme="light"] .login-screen-overlay {
  background: radial-gradient(circle at center, rgba(248, 250, 252, 0.98) 0%, rgba(241, 245, 249, 0.99) 100%);
}

.login-card {
  background: var(--bg-glass-card);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-xl);
  padding: 2.75rem 2.25rem;
  width: 100%;
  max-width: 440px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .login-card {
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.12), 0 0 30px rgba(99, 102, 241, 0.1);
}

.login-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);
}

.login-brand {
  margin-bottom: 2rem;
}

.login-brand-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  color: #ffffff;
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
}

.login-brand-icon i {
  width: 30px;
  height: 30px;
}

.login-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.login-form {
  text-align: left;
}

.login-form .form-group {
  margin-bottom: 1.25rem;
}

.login-form .form-label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.login-form .input-wrapper {
  position: relative;
  width: 100%;
}

.login-form .form-control {
  width: 100% !important;
  height: 48px !important;
  padding: 0.75rem 1.15rem !important;
  background: var(--bg-secondary) !important;
  border: 1.5px solid var(--border-color) !important;
  border-radius: 12px !important; /* 顯著四邊圓角 (R角) */
  color: var(--text-primary) !important;
  font-family: var(--font-family) !important;
  font-size: 0.95rem !important;
  outline: none !important;
  box-sizing: border-box !important;
  transition: var(--transition) !important;
  display: block !important;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .login-form .form-control {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  color: #0f172a !important;
}

.login-form .form-control:hover {
  border-color: rgba(255, 255, 255, 0.3) !important;
}

[data-theme="light"] .login-form .form-control:hover {
  border-color: #94a3b8 !important;
}

.login-form .form-control:focus {
  border-color: var(--accent-primary) !important;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25), var(--border-glow) !important;
  background: var(--bg-tertiary) !important;
}

[data-theme="light"] .login-form .form-control:focus {
  background: #ffffff !important;
  border-color: #6366f1 !important;
}

.login-form .password-wrapper input {
  padding-right: 3.25rem !important;
}

.login-form .toggle-pwd-btn {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 5;
}

.login-form .toggle-pwd-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

[data-theme="light"] .login-form .toggle-pwd-btn:hover {
  color: #0f172a;
  background: rgba(0, 0, 0, 0.06);
}

.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
}

.remember-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.remember-label input[type="checkbox"] {
  accent-color: var(--accent-primary);
  cursor: pointer;
}

.login-error-msg {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: fadeIn 0.25s ease;
}

.btn-login {
  width: 100%;
  padding: 0.85rem;
  font-size: 1rem;
  font-weight: 600;
  justify-content: center;
  border-radius: var(--radius-md);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
  margin-top: 0.5rem;
}

.login-footer {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

/* Shake Animation for Login Error */
.login-card.shake {
  animation: shake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-2px, 0, 0); }
  20%, 80% { transform: translate3d(4px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-6px, 0, 0); }
  40%, 60% { transform: translate3d(6px, 0, 0); }
}

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