/* Style Reset & CSS Variables */
:root {
  --bg-primary: #0a0a0c;
  --bg-secondary: #131316;
  --bg-tertiary: #1c1c21;
  --bg-input: #25252b;

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);

  --success: #10b981;
  --success-hover: #059669;
  --success-light: rgba(16, 185, 129, 0.12);

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: rgba(239, 68, 68, 0.12);

  --border: #2a2a32;
  --border-focus: #4f46e5;

  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);

  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.5;
  padding: 24px 16px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

/* Container */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
}

.logo-section h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-section h1 svg {
  color: var(--accent);
  flex-shrink: 0;
}

.logo-section p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Card Style */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Form Fields */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
}

input[type="text"],
input[type="number"],
input[type="month"],
input[type="date"] {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 1rem;
  padding: 12px 16px;
  border-radius: var(--radius);
  outline: none;
  width: 100%;
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="month"]:focus,
input[type="date"]:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
  background-color: var(--bg-secondary);
}

/* Styled Autocomplete Datalist hack for consistency */
input[list]::-webkit-calendar-picker-indicator {
  display: none !important;
}

/* Day Rules (Weekly Selectors) */
.day-rules-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.days-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.day-pill {
  flex: 1;
  min-width: 60px;
  text-align: center;
}

.day-pill input {
  display: none;
}

.day-pill label {
  display: block;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 12px 8px;
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.day-pill input:checked+label {
  background-color: var(--accent-light);
  border-color: var(--accent);
  color: var(--text-primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.day-pill label:hover {
  border-color: var(--text-muted);
}

/* Table Section */
.table-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 4px 8px 4px;
}

.table-header-row h2 {
  font-size: 1.15rem;
  font-weight: 700;
}

.table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background-color: var(--bg-secondary);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

th {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 14px 16px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td {
  border-bottom: none;
}

/* Responsive Table cards for Mobile */
@media (max-width: 600px) {

  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
  }

  thead {
    display: none;
  }

  tr {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  td {
    padding: 0;
    border: none;
    width: 100% !important;
  }

  td.date-cell {
    font-weight: 700;
    font-size: 1.05rem;
  }
}

/* Table row dimming when absent */
tr.row-absent {
  opacity: 0.45;
  transition: var(--transition);
}

tr.row-absent input {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* Segmented Control for Attendance Toggle */
.segmented-control {
  display: flex;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 3px;
  border-radius: var(--radius);
  width: 170px;
  position: relative;
}

@media (max-width: 600px) {
  .segmented-control {
    width: 100%;
    max-width: 240px;
  }
}

.segmented-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  outline: none;
  text-align: center;
}

.segmented-btn.present.active {
  background-color: var(--success-light);
  color: var(--success);
}

.segmented-btn.absent.active {
  background-color: var(--danger-light);
  color: var(--danger);
}

/* Input inside table */
.table-input {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  outline: none;
  width: 100%;
  transition: var(--transition);
}

.table-input:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-secondary);
}

/* Summary Card */
.summary-bar {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.summary-info {
  display: flex;
  flex-direction: column;
}

.summary-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.summary-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--success);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.summary-value span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Action Buttons */
.action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 14px 20px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  outline: none;
  user-select: none;
}

.btn:hover {
  background-color: var(--bg-input);
  border-color: var(--text-muted);
}

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  grid-column: span 2;
}

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

@media (max-width: 600px) {
  .btn-primary {
    grid-column: span 1;
  }
}

.btn-success {
  background-color: var(--success-light);
  border-color: var(--success);
  color: var(--success);
}

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

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

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

.btn svg {
  flex-shrink: 0;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-focus);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast svg {
  color: var(--success);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
  gap: 12px;
}

.empty-state svg {
  color: var(--text-muted);
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 300px;
}

/* Row-level Hours Input */
.table-hour-input {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 8px;
  border-radius: var(--radius-sm);
  outline: none;
  width: 70px;
  text-align: center;
  transition: var(--transition);
}

.table-hour-input:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-secondary);
}

/* Group Student Attendance Badges */
.group-students-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.student-badge-btn {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 20px;
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
  outline: none;
}

.student-badge-btn.present {
  background-color: var(--success-light);
  border-color: var(--success);
  color: var(--success);
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.1);
}

.student-badge-btn.absent {
  background-color: var(--danger-light);
  border-color: var(--danger);
  color: var(--danger);
  opacity: 0.75;
}

/* Premium Passcode Gate Lockscreen */
.gate-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 20px;
}

.gate-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 40px 30px;
  border-radius: 20px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.gate-icon {
  background: var(--accent-light);
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  color: var(--accent);
}

.gate-card h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.gate-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Premium Backdrop & Modal Popup */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 20px;
  animation: fadeIn 0.25s ease;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 30px;
  border-radius: 16px;
  width: 100%;
  max-width: 360px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: scaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-content h3 {
  font-size: 1.25rem;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.modal-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

@keyframes scaleUp {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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