/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700&display=swap');

:root {
  /* Colors */
  --primary: hsl(220, 80%, 48%); /* Deep blue #1a56db */
  --primary-hover: hsl(220, 80%, 43%);
  --secondary: #0d9488; /* Warm teal */
  --secondary-hover: #0f766e;
  
  --bg-color: #f5f6fa;
  --surface: #ffffff;
  --surface-hover: #f9fafb;
  
  --text-main: #1f2937;
  --text-muted: #6b7280;
  
  --success: #10b981;
  --success-bg: #d1fae5;
  --success-text: #065f46;
  
  --warning: #f59e0b;
  --warning-bg: #fef3c7;
  --warning-text: #92400e;
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-bg: #fee2e2;
  --danger-text: #991b1b;
  
  --border: #e5e7eb;
  
  /* Typography */
  --font-sans: 'Inter', 'Noto Sans TC', system-ui, sans-serif;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-full: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition: all 0.2s ease;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background-color: #111827;
  color: #fff;
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  z-index: 40;
  transition: transform 0.3s ease;
  border-right: 1px solid #1f2937;
}

.sidebar-header {
  padding: 1.25rem 1.25rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: #f9fafb;
  border-bottom: 1px solid #1f2937;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.sidebar-nav {
  padding: 0.75rem 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-nav-main {
  flex: 1;
}

.sidebar-nav-footer {
  border-top: 1px solid #1f2937;
  padding-top: 0.5rem;
  margin-top: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 0.65rem 1rem;
  margin: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  color: #9ca3af;
  font-size: 0.925rem;
  font-weight: 500;
  transition: var(--transition);
  text-decoration: none;
}

.nav-item:hover {
  background-color: #1f2937;
  color: #f9fafb;
}

.nav-item.active {
  background-color: #1f2937;
  color: #ffffff;
  font-weight: 600;
}

.nav-item.active i:first-child {
  color: var(--primary);
}

/* Sidebar Workflow Guide Accordion */
.sidebar-guide-container {
  margin: 0.2rem 0;
}

.guide-toggle {
  cursor: pointer;
  user-select: none;
}

.guide-chevron {
  margin-left: auto;
  font-size: 0.75rem;
  transition: transform 0.25s ease;
  opacity: 0.6;
}

.guide-chevron.open {
  transform: rotate(180deg);
  opacity: 1;
  color: var(--primary);
}

.sidebar-guide-steps {
  display: none;
  margin: 0.25rem 0.6rem 0.6rem 0.6rem;
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid rgba(75, 85, 99, 0.45);
  border-radius: 8px;
  padding: 0.5rem 0.45rem;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-guide-steps.open {
  display: flex;
  animation: fadeIn 0.2s ease-in-out;
}

.guide-step {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.guide-step:hover {
  background: rgba(55, 65, 81, 0.8);
  transform: translateX(2px);
}

.guide-num {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  font-size: 0.68rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.guide-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.guide-text strong {
  font-size: 0.8rem;
  color: #e5e7eb;
  font-weight: 600;
}

.guide-text small {
  font-size: 0.68rem;
  color: #9ca3af;
}

.nav-item i {
  margin-right: 0.65rem;
  width: 1.25rem;
  text-align: center;
  font-size: 1rem;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 240px;
  padding: 2rem;
  max-width: 1200px;
  width: 100%;
}

.top-bar-mobile {
  display: none;
  background-color: #111827;
  color: #fff;
  padding: 1rem;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 30;
}

.menu-toggle {
  color: #fff;
  font-size: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
    padding: 1rem;
  }
  .top-bar-mobile {
    display: flex;
  }
}

/* Cards */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

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

/* Tables */
.table-responsive {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

th {
  background-color: #f9fafb;
  padding: 0.85rem 1rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: #4b5563;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 0.85rem 1rem;
  font-size: 0.925rem;
  color: #1f2937;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

td strong {
  font-size: 0.925rem;
  font-weight: 600;
}

tr:hover td {
  background-color: var(--surface-hover);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: #374151;
}

.form-control {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  color: #1f2937;
  transition: var(--transition);
  box-sizing: border-box;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-weight: 500;
  transition: var(--transition);
  gap: 0.4rem;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #fff;
  border: 1px solid var(--border);
  color: #374151;
}

.btn-secondary:hover {
  background-color: var(--surface-hover);
}

.btn-danger {
  background-color: var(--danger);
  color: #fff;
  border: 1px solid transparent;
}

.btn-danger:hover {
  background-color: var(--danger-hover);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.925rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  box-sizing: border-box;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 560px;
  max-height: min(90vh, calc(100dvh - 2rem));
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: translateY(-20px);
  transition: var(--transition);
  font-size: 0.925rem;
  overflow: hidden;
  box-sizing: border-box;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  background-color: #fff;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #111827;
}

.modal-close {
  color: var(--text-muted);
  font-size: 1.1rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.modal-close:hover {
  color: var(--text-main);
  background-color: #f3f4f6;
}

.modal-body {
  padding: 1.25rem 1.5rem;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1 1 auto;
  overscroll-behavior: contain;
  box-sizing: border-box;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  background-color: #f9fafb;
  box-sizing: border-box;
}

.modal-body .modal-footer {
  margin: 1.25rem -1.5rem -1.25rem -1.5rem;
  padding: 1rem 1.5rem;
  background-color: #f9fafb;
}

/* Badges / Pills */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.35;
}

.badge-scheduled {
  background-color: #dbeafe;
  color: #1e40af;
}

.badge-inprogress {
  background-color: var(--warning-bg);
  color: var(--warning-text);
}

.badge-completed {
  background-color: var(--success-bg);
  color: var(--success-text);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2.5rem;
  right: 2rem;
  z-index: 1100;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border);
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transform: translateX(130%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.toast.show {
  transform: translateX(0);
}

.toast-success { border-left: 4px solid var(--success); }
.toast-error { border-left: 4px solid var(--danger); }
.toast-info { border-left: 4px solid var(--primary); }

/* Empty States */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
}

.empty-state > i {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.4;
  display: block;
}

.empty-state .btn i {
  font-size: 0.875rem !important;
  margin-bottom: 0 !important;
  opacity: 1 !important;
  display: inline-block !important;
}

/* Search Bar */
.search-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
}

.search-input-wrapper i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input-wrapper .form-control {
  padding-left: 2.5rem;
}

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-pane {
  display: none;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Header with action */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

/* Roll Call UI Specifics */
.roll-call-step {
  display: none;
  animation: fadeIn 0.3s ease;
}

.roll-call-step.active {
  display: block;
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.student-toggle-card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  border: 2px solid transparent;
}

.student-toggle-card.present {
  border-color: var(--success);
  background-color: var(--success-bg);
}

.student-toggle-card.absent {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

.student-info {
  font-size: 1.125rem;
  font-weight: 600;
}

.toggle-btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  color: #fff;
  transition: var(--transition);
  min-width: 100px;
}

.toggle-btn.present {
  background-color: var(--success);
}

.toggle-btn.absent {
  background-color: var(--danger);
}

.stats-bar {
  position: sticky;
  bottom: 0;
  background-color: var(--surface);
  padding: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 -4px 6px -1px rgb(0 0 0 / 0.1);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  z-index: 20;
}

.stats-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.summary-lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .summary-lists {
    grid-template-columns: 1fr;
  }
}

.summary-list-card {
  padding: 1.5rem;
}

.summary-list-card h3 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.summary-list-card.present h3 { color: var(--success-text); border-color: var(--success); }
.summary-list-card.absent h3 { color: var(--danger-text); border-color: var(--danger); }

/* Calendar Schedule Specifics - Fixed Grid Size */
.calendar-grid-header {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  text-align: center;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.75rem 0;
  border-bottom: 2px solid var(--border);
  background: var(--bg-color);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.calendar-grid-body {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  grid-auto-rows: 130px;
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-top: none;
}

.calendar-day-cell {
  background-color: var(--surface);
  height: 130px;
  max-height: 130px;
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  transition: background-color 0.15s ease;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

.calendar-day-cell:hover {
  background-color: #fafafa;
}

.calendar-day-cell.other-month {
  background-color: #f8fafc;
  color: #94a3b8;
}

.calendar-day-cell.today {
  background-color: #f0f7ff;
}

.calendar-day-cell.today .calendar-date-number {
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.calendar-day-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.2rem;
  flex-shrink: 0;
}

.calendar-date-number {
  font-size: 0.825rem;
  font-weight: 700;
}

.calendar-add-btn {
  opacity: 0;
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: 1px 3px;
  border-radius: 4px;
  font-size: 0.7rem;
  transition: opacity 0.15s ease;
}

.calendar-day-cell:hover .calendar-add-btn {
  opacity: 1;
}

.calendar-events-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;
  padding-right: 2px;
}

.calendar-events-list::-webkit-scrollbar {
  width: 4px;
}

.calendar-events-list::-webkit-scrollbar-thumb {
  background-color: #cbd5e1;
  border-radius: 4px;
}

.calendar-event-pill {
  font-size: 0.725rem;
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
  cursor: pointer;
  display: block;
  line-height: 1.25;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  text-decoration: none;
  flex-shrink: 0;
  overflow: hidden;
}

.calendar-event-pill:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.calendar-event-pill.status-scheduled {
  background-color: #eff6ff;
  color: #1e40af;
  border-left: 3px solid #3b82f6;
}

.calendar-event-pill.status-completed {
  background-color: #ecfdf5;
  color: #065f46;
  border-left: 3px solid #10b981;
}

.calendar-event-pill .event-time {
  font-size: 0.675rem;
  font-weight: 700;
  opacity: 0.9;
  margin-right: 0.25rem;
}

.calendar-event-pill .event-title {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  max-width: calc(100% - 40px);
  vertical-align: middle;
}

.calendar-event-pill .event-coach {
  font-size: 0.675rem;
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

/* Non-Course Calendar Item Pills */
.calendar-item-pill {
  font-size: 0.725rem;
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
  cursor: pointer;
  display: block;
  line-height: 1.25;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  text-decoration: none;
  flex-shrink: 0;
  overflow: hidden;
}

.calendar-item-pill:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.calendar-item-pill .item-title {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  max-width: calc(100% - 20px);
  vertical-align: middle;
}

.calendar-item-pill .item-time {
  font-size: 0.675rem;
  font-weight: 700;
  opacity: 0.9;
  margin-right: 0.25rem;
}

.calendar-item-pill.color-amber { background-color: #fffbeb; color: #92400e; border-left: 3px solid #f59e0b; }
.calendar-item-pill.color-red { background-color: #fef2f2; color: #991b1b; border-left: 3px solid #ef4444; }
.calendar-item-pill.color-emerald { background-color: #ecfdf5; color: #065f46; border-left: 3px solid #10b981; }
.calendar-item-pill.color-purple { background-color: #faf5ff; color: #6b21a8; border-left: 3px solid #a855f7; }
.calendar-item-pill.color-indigo { background-color: #eef2ff; color: #3730a3; border-left: 3px solid #6366f1; }
.calendar-item-pill.color-sky { background-color: #f0f9ff; color: #075985; border-left: 3px solid #0ea5e9; }
.calendar-item-pill.color-gray { background-color: #f3f4f6; color: #374151; border-left: 3px solid #6b7280; }

@media (max-width: 768px) {
  .calendar-grid-body {
    grid-auto-rows: 90px;
  }
  .calendar-day-cell {
    height: 90px;
    max-height: 90px;
    padding: 0.2rem;
  }
  .calendar-event-pill .event-coach {
    display: none;
  }
}