/* ==========================================================
   MRU Teacher Timetable & Availability Tracker Stylesheet
   Matches official aSc Timetables institutional print layout
   ========================================================== */

:root {
  --primary-navy: #0F1C3F;
  --primary-accent: #2563EB;
  --bg-color: #F8FAFC;
  --card-bg: #FFFFFF;
  --border-color: #CBD5E1;
  --table-border: #1E293B;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --lunch-bg: #F1F5F9;
  --free-bg: #FFFFFF;
  --lab-badge: #E0E7FF;
  --lecture-badge: #FEF3C7;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

/* ================= Screen Navigation & Header ================= */
.app-header {
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-mark {
  background: var(--primary-navy);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 18px;
  padding: 8px 14px;
  border-radius: 8px;
  letter-spacing: 1px;
}

.brand-text h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-navy);
}

.brand-text .sub-text {
  font-size: 12px;
  color: var(--text-muted);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mode-toggle {
  display: flex;
  background: #EEF2F6;
  padding: 4px;
  border-radius: 8px;
}

.toggle-btn {
  background: transparent;
  border: none;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background: #FFFFFF;
  color: var(--primary-navy);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary-navy);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #1e293b;
}

.btn-secondary {
  background: #0D9488;
  color: #FFFFFF;
}

.btn-secondary:hover {
  background: #0f766e;
}

.btn-sync {
  background: #F1F5F9;
  color: var(--primary-navy);
  border: 1px solid var(--border-color);
  font-weight: 600;
}

.btn-sync:hover {
  background: #E2E8F0;
  border-color: #94A3B8;
}

.btn-sync:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.sync-icon {
  display: inline-block;
  font-size: 14px;
  transition: transform 0.3s;
}

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

/* Live Sync Status Pill */
.sync-status-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
}

.live-dot {
  width: 8px;
  height: 8px;
  background-color: #22C55E;
  border-radius: 50%;
  box-shadow: 0 0 0 rgba(34, 197, 94, 0.4);
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(34, 197, 94, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
  }
}

.sync-label {
  font-weight: 600;
  color: #166534;
}

.sync-time {
  font-weight: 500;
  color: #15803D;
  font-family: 'Roboto Mono', monospace;
  font-size: 11.5px;
}

/* Floating Toast Notification */
.toast-popup {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #0F172A;
  color: #FFFFFF;
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  font-weight: 500;
  z-index: 1000;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid #334155;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.btn-outline {
  background: transparent;
  color: var(--primary-navy);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: #F1F5F9;
}

/* ================= Selection & Autocomplete Bar ================= */
.selection-bar {
  max-width: 1400px;
  margin: 0 auto;
  padding: 10px 24px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-wrapper {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  color: var(--text-muted);
}

.search-wrapper input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  font-size: 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  outline: none;
  background: #F8FAFC;
  transition: border-color 0.2s;
}

.search-wrapper input:focus {
  border-color: var(--primary-accent);
  background: #FFFFFF;
}

.search-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  max-height: 380px;
  overflow-y: auto;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
  z-index: 200;
}

.search-dropdown.hidden {
  display: none;
}

.dropdown-item {
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  border-bottom: 1px solid #F1F5F9;
  transition: background 0.15s;
}

.dropdown-item:hover, .dropdown-item.selected {
  background: #EFF6FF;
}

.item-main {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-main);
}

.item-badge {
  font-size: 12px;
  padding: 3px 8px;
  background: #EEF2F6;
  color: #334155;
  border-radius: 4px;
  font-family: 'Roboto Mono', monospace;
}

.alpha-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.alpha-btn {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.alpha-btn:hover, .alpha-btn.active {
  background: var(--primary-navy);
  color: #FFFFFF;
  border-color: var(--primary-navy);
}

/* ================= Timetable Sheet & Official View ================= */
.timetable-wrapper {
  max-width: 1400px;
  margin: 20px auto 40px;
  padding: 0 20px;
}

.timetable-sheet {
  background: #FFFFFF;
  border: 1px solid #CBD5E1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  padding: 24px;
  border-radius: 4px;
  min-height: 600px;
}

/* Institutional Header matching official document */
.sheet-header {
  display: grid;
  grid-template-columns: 280px 1fr 200px;
  align-items: center;
  border-bottom: 2px solid #000000;
  padding-bottom: 16px;
  margin-bottom: 16px;
}

.brand-logo-text .univ-title {
  display: block;
  font-size: 17px;
  font-weight: 800;
  color: #0A3A60;
  letter-spacing: 0.5px;
}

.brand-logo-text .univ-statutory {
  display: block;
  font-size: 8.5px;
  color: #475569;
  margin-top: 2px;
}

.gptw-badge {
  margin-top: 6px;
}

.badge-tag {
  display: inline-block;
  background: #DC2626;
  color: #FFFFFF;
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 2px;
}

.header-center {
  text-align: center;
}

.sheet-title {
  font-size: 32px;
  font-weight: 800;
  color: #000000;
  letter-spacing: -0.5px;
  margin-bottom: 2px;
}

.sheet-subtitle {
  font-size: 13px;
  color: #334155;
  font-weight: 500;
}

.teacher-meta-badge {
  display: inline-block;
  margin-top: 4px;
  font-size: 12px;
  font-weight: 600;
  color: #0F766E;
}

.header-right {
  text-align: right;
}

.stats-card {
  display: inline-block;
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 6px;
  text-align: center;
}

.stats-label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.stats-val {
  display: block;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary-navy);
}

/* ================= The Timetable Grid (Matching Screenshot) ================= */
.grid-container {
  overflow-x: auto;
  margin-bottom: 16px;
}

.asc-timetable {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  border: 2px solid #000000;
  background: #FFFFFF;
}

.asc-timetable th, .asc-timetable td {
  border: 1px solid #333333;
  vertical-align: top;
  padding: 0;
}

/* Table Header */
.asc-timetable thead tr th {
  background: #FFFFFF;
  color: #000000;
  text-align: center;
  padding: 6px 2px;
  border-bottom: 2px solid #000000;
}

.day-col-header {
  width: 70px;
  font-size: 14px;
  font-weight: 700;
}

.period-header-cell .period-num {
  display: block;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
}

.period-header-cell .period-time {
  display: block;
  font-size: 9.5px;
  color: #334155;
  font-weight: 500;
  margin-top: 2px;
}

.period-header-cell.lunch-col {
  background: var(--lunch-bg);
}

/* Day Column (Mo, Tu, We, Th, Fr) */
.day-cell {
  text-align: center;
  vertical-align: middle !important;
  font-size: 30px;
  font-weight: 700;
  color: #000000;
  background: #FFFFFF;
  border-right: 2px solid #000000 !important;
  width: 70px;
}

/* Slot Cell & Card Structure */
.slot-cell {
  height: 98px;
  position: relative;
  background: #FFFFFF;
}

.slot-cell.is-lunch {
  background: #F8FAFC;
  display: table-cell;
}

.slot-cell.is-free {
  background: #FFFFFF;
}

.slot-content-wrapper {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Single or Split Sessions inside a cell */
.card-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 4px 6px;
  position: relative;
  overflow: hidden;
}

.card-item + .card-item {
  border-top: 1px dashed #64748B;
}

.card-top-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 11px;
}

.card-room {
  font-weight: 700;
  color: #000000;
  font-size: 12px;
}

.card-group {
  font-size: 9px;
  color: #475569;
  font-weight: 600;
  text-align: right;
}

.card-subject {
  font-size: 10.5px;
  font-weight: 600;
  color: #000000;
  text-align: center;
  line-height: 1.2;
  margin: 3px 0;
  text-transform: uppercase;
  word-break: break-word;
}

.card-bottom-row {
  font-size: 10.5px;
  font-weight: 600;
  color: #000000;
  text-align: left;
}

.card-bottom-row.teacher-name-label {
  text-transform: uppercase;
  color: #334155;
  font-size: 10px;
}

/* Free Period Cell */
.free-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: #CBD5E1;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* Footer Section */
.sheet-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid #000000;
  font-size: 11px;
  color: #333333;
}

/* ================= States (Loading & Empty) ================= */
.loading-state, .empty-state {
  text-align: center;
  padding: 60px 20px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #E2E8F0;
  border-top-color: var(--primary-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

.empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.empty-state h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 6px;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 14px;
}

.popular-suggestions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.suggestion-chip {
  background: #F1F5F9;
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.suggestion-chip:hover {
  background: #E2E8F0;
  border-color: #94A3B8;
}

.hidden {
  display: none !important;
}

/* ================= Modal: Free Teachers ================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 20px;
}

.modal-card {
  background: #FFFFFF;
  border-radius: 12px;
  width: 100%;
  max-width: 800px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.modal-title h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-navy);
}

.modal-title p {
  font-size: 12px;
  color: var(--text-muted);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-filters {
  padding: 12px 20px;
  background: #F8FAFC;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
}

.filter-group select {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 13px;
  background: #FFFFFF;
}

.modal-results {
  padding: 16px 20px;
  overflow-y: auto;
  flex: 1;
}

.results-summary {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.free-teachers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}

.free-teacher-card {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: #F8FAFC;
  cursor: pointer;
  transition: all 0.15s;
}

.free-teacher-card:hover {
  background: #EFF6FF;
  border-color: var(--primary-accent);
}

.free-teacher-name {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text-main);
}

.free-teacher-code {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'Roboto Mono', monospace;
}

/* ================= PRINT STYLESHEET (Exact Landscape Matching) ================= */
@media print {
  @page {
    size: A4 landscape;
    margin: 6mm;
  }

  body {
    background: #FFFFFF !important;
    color: #000000 !important;
    font-size: 10pt;
  }

  .no-print, .app-header, .modal-overlay {
    display: none !important;
  }

  .timetable-wrapper {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .timetable-sheet {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    min-height: auto !important;
  }

  .sheet-header {
    margin-bottom: 8px !important;
    padding-bottom: 8px !important;
  }

  .asc-timetable {
    width: 100% !important;
    border: 1.5pt solid #000000 !important;
  }

  .asc-timetable th, .asc-timetable td {
    border: 1pt solid #000000 !important;
  }

  .slot-cell {
    height: 80px !important;
  }

  .free-indicator {
    display: none !important;
  }
}