/* 
  ======================================================
  Official Government Administrative Design System (UI)
  Theme: Royal Government (ส่วนราชการ / ทางการ)
  Colors: Royal Navy Blue & Bronze Gold
  ======================================================
*/

:root {
  /* Official Government Colors */
  --primary: #1B365D;          /* Royal Thai Navy Blue */
  --primary-light: #2A4D7E;
  --primary-dark: #0D2240;     /* Midnight Navy */
  --secondary: #9A7B56;        /* Bronze Gold Accent */
  --secondary-light: #B89C78;  /* Light Gold */
  --secondary-dark: #7A5F3F;   /* Dark Gold */
  --bg: #F4F6F9;               /* Clean Admin Light Grey */
  --card-bg: #FFFFFF;
  --text: #2D3748;             /* Charcoal Dark Gray */
  --text-light: #718096;       /* Subtle Gray */
  --border: #E2E8F0;           /* Soft Border */
  --border-radius: 6px;        /* Official Crisp Corners */
  
  /* Status Colors (Muted for Professional Administration) */
  --success: #1E7E34;          /* Forest Green (Present) */
  --success-bg: #EAFDF0;
  --success-border: #C3E6CB;
  
  --warning: #D39E00;          /* Amber Gold (Late) */
  --warning-bg: #FFFDF0;
  --warning-border: #FFEEBA;
  
  --danger: #BD2130;           /* Crimson Red (Absent) */
  --danger-bg: #FDF2F2;
  --danger-border: #F5C6CB;
  
  --info: #004085;             /* Deep Blue (Leave) */
  --info-bg: #CCE5FF;
  --info-border: #B8DAFF;
}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

body {
  font-family: 'Sarabun', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
  background: #c5a880;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #9a7b56;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed; 
  inset: 0;
  background: rgba(255, 255, 255, 0.96);
  display: none;
  flex-direction: column; 
  align-items: center; 
  justify-content: center;
  z-index: 9999; 
  gap: 16px;
}
.loading-overlay.active { 
  display: flex; 
}
.spinner {
  width: 48px; 
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--secondary); /* Gold spinner */
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}
@keyframes spin { 
  to { transform: rotate(360deg); } 
}

/* Thai National Flag Ribbon for Sidebar/Topbar Header */
.national-ribbon {
  height: 4px;
  width: 100%;
  background: linear-gradient(to right, 
    #a81b1b 0%, #a81b1b 20%, 
    #ffffff 20%, #ffffff 40%, 
    #1b365d 40%, #1b365d 60%, 
    #ffffff 60%, #ffffff 80%, 
    #a81b1b 80%, #a81b1b 100%
  );
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1100;
}

/* Sidebar */
.sidebar {
  position: fixed; 
  left: 0; 
  top: 0;
  width: 260px; 
  height: 100vh;
  background: linear-gradient(180deg, var(--primary-dark) 0%, #081426 100%);
  color: white;
  display: flex; 
  flex-direction: column;
  z-index: 1000;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 4px 0 15px rgba(0, 0, 0, 0.15);
  border-right: 1px solid rgba(154, 123, 86, 0.25); /* Gold outline */
}
.sidebar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, #a81b1b 20%, #ffffff 20%, #ffffff 40%, #1b365d 40%, #1b365d 60%, #ffffff 60%, #ffffff 80%, #a81b1b 80%);
  z-index: 1002;
}
.sidebar-header {
  padding: 30px 20px 20px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex; 
  align-items: center; 
  gap: 12px;
}
.sidebar-header img { 
  width: 44px; 
  height: 44px; 
  border-radius: var(--border-radius); 
  object-fit: cover; 
  background: white; 
  border: 2px solid var(--secondary);
  padding: 2px;
}
.sidebar-header h2 { 
  font-size: 15px; 
  font-weight: 700; 
  letter-spacing: 0.5px;
  color: #FFFFFF;
  line-height: 1.3;
}
.sidebar-header small { 
  opacity: 0.75; 
  font-size: 11px; 
  display: block;
  margin-top: 2px;
  color: var(--secondary-light);
  font-weight: 500;
}
.sidebar-menu { 
  padding: 20px 0; 
  flex: 1; 
  overflow-y: auto; 
}
.menu-item {
  display: flex; 
  align-items: center; 
  gap: 14px;
  padding: 12px 24px; 
  color: #CBD5E1;
  cursor: pointer; 
  text-decoration: none;
  transition: all 0.2s ease;
  border-left: 4px solid transparent;
  font-size: 14px;
  font-weight: 500;
}
.menu-item:hover { 
  background: rgba(255, 255, 255, 0.05); 
  color: #FFFFFF; 
  border-left-color: rgba(154, 123, 86, 0.4);
}
.menu-item.active { 
  background: rgba(255, 255, 255, 0.08); 
  color: #FFFFFF; 
  border-left-color: var(--secondary); /* Gold indicator */
  font-weight: 600;
}
.menu-item.active i {
  color: var(--secondary);
}
.menu-item i { 
  font-size: 18px; 
  width: 20px; 
  color: #94A3B8;
  transition: color 0.2s ease;
}

/* Wrapper & Layout */
.main-wrapper { 
  margin-left: 260px; 
  min-height: 100vh; 
  display: flex; 
  flex-direction: column; 
}
.topbar {
  background: var(--card-bg);
  padding: 16px 28px;
  display: flex; 
  align-items: center; 
  gap: 16px;
  border-bottom: 2px solid var(--secondary); /* Gold bottom border for status */
  position: sticky; 
  top: 0; 
  z-index: 100;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
.topbar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(to right, #a81b1b 20%, #ffffff 20%, #ffffff 40%, #1b365d 40%, #1b365d 60%, #ffffff 60%, #ffffff 80%, #a81b1b 80%);
}
.topbar h1 { 
  font-size: 18px; 
  font-weight: 700; 
  flex: 1; 
  color: var(--primary);
  letter-spacing: 0.3px;
}
.menu-toggle { 
  display: none; 
  background: none; 
  border: none; 
  font-size: 24px; 
  cursor: pointer; 
  color: var(--text); 
}
.topbar-right { 
  color: var(--text-light); 
  font-size: 13px;
  font-weight: 600;
  background: #F1F5F9;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.content { 
  flex: 1; 
  padding: 28px; 
}
.footer {
  background: var(--card-bg); 
  border-top: 1px solid var(--border);
  padding: 16px 28px; 
  text-align: center; 
  color: var(--text-light); 
  font-size: 12px;
  font-weight: 600;
}

.page { 
  display: none; 
  animation: fadeIn 0.25s ease-out; 
}
.page.active { 
  display: block; 
}
@keyframes fadeIn { 
  from { opacity: 0; transform: translateY(8px); } 
  to { opacity: 1; transform: translateY(0); } 
}
.page-header {
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  margin-bottom: 24px; 
  gap: 16px; 
  flex-wrap: wrap;
  border-bottom: 2px solid var(--border);
  padding-bottom: 12px;
  position: relative;
}
.page-header::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 80px;
  height: 2px;
  background: var(--secondary); /* Golden line indicator under header */
}
.page-header h2 { 
  font-size: 20px; 
  font-weight: 700; 
  color: var(--primary);
}

/* Formal Administrative Panels */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}
.card-header {
  padding: 14px 20px;
  background: #F8FAFC;
  border-bottom: 1px solid var(--border);
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  gap: 12px; 
  flex-wrap: wrap;
  border-top: 3px solid var(--primary); /* Deep Navy Top Accent */
}
.card-header h3 { 
  font-size: 15px; 
  font-weight: 700; 
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-body { 
  padding: 20px 24px; 
}

/* Stats Dashboard Grids */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  border-left: 5px solid var(--primary); /* Left border accent */
  display: flex; 
  align-items: center; 
  gap: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}
.stat-icon {
  width: 52px; 
  height: 52px; 
  border-radius: 50%;
  display: flex; 
  align-items: center; 
  justify-content: center;
  color: white; 
  font-size: 22px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.08);
}
.stat-label { 
  color: var(--text-light); 
  font-size: 13px; 
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-value { 
  font-size: 28px; 
  font-weight: 700; 
  color: var(--primary);
  line-height: 1.2;
}

/* Form Styles */
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.form-group { 
  margin-bottom: 12px; 
}
.form-group label { 
  display: block; 
  font-weight: 600; 
  margin-bottom: 6px; 
  font-size: 13px; 
  color: var(--primary-light);
}
.form-control {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #CBD5E1;
  border-radius: var(--border-radius);
  font-family: inherit; 
  font-size: 13px;
  color: var(--text);
  background-color: #FFFFFF;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus { 
  outline: none; 
  border-color: var(--primary); 
  box-shadow: 0 0 0 3px rgba(27, 54, 93, 0.12); 
}
.form-color { 
  height: 38px; 
  padding: 3px; 
  cursor: pointer; 
}

/* Administrative Buttons */
.btn {
  display: inline-flex; 
  align-items: center; 
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid transparent; 
  border-radius: var(--border-radius);
  font-family: inherit; 
  font-size: 13px; 
  font-weight: 700;
  cursor: pointer; 
  text-decoration: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn:hover { 
  transform: translateY(-1px); 
  box-shadow: 0 4px 8px rgba(0,0,0,0.1); 
}
.btn:active {
  transform: translateY(0);
}
.btn-primary { 
  background: var(--primary); 
  color: white; 
  border-color: var(--primary);
}
.btn-primary:hover { 
  background: var(--primary-light); 
  border-color: var(--primary-light);
}
.btn-secondary { 
  background: #FFFFFF; 
  color: var(--text); 
  border-color: #CBD5E1;
}
.btn-secondary:hover {
  background: #F8FAFC;
  border-color: #94A3B8;
}
.btn-success { 
  background: var(--success); 
  color: white; 
  border-color: var(--success);
}
.btn-success:hover { 
  background: #176127; 
}
.btn-danger { 
  background: var(--danger); 
  color: white; 
  border-color: var(--danger);
}
.btn-danger:hover { 
  background: #961A25; 
}
.btn-warning { 
  background: var(--warning); 
  color: white; 
  border-color: var(--warning);
}
.btn-warning:hover { 
  background: #B28500; 
}
.btn-info { 
  background: var(--info); 
  color: white; 
  border-color: var(--info);
}
.btn-info:hover { 
  background: #002D5E; 
}
.btn-sm { 
  padding: 5px 12px; 
  font-size: 12px; 
}
.btn-lg { 
  padding: 10px 22px; 
  font-size: 14px; 
}

/* Data Tables - Formal Administrative Style */
.table-responsive { 
  overflow-x: auto; 
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.data-table { 
  width: 100%; 
  border-collapse: collapse; 
  background: #FFFFFF;
}
.data-table th, .data-table td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text);
}
.data-table th { 
  background: var(--primary); 
  color: white; 
  font-weight: 700; 
  letter-spacing: 0.3px;
  border-bottom: 2px solid var(--secondary); /* Golden line between header & body */
}
.data-table tbody tr:nth-child(even) {
  background-color: #F8FAFC;
}
.data-table tbody tr:hover { 
  background: #F1F5F9; 
}
.color-swatch {
  display: inline-block;
  width: 22px; 
  height: 22px;
  border-radius: 4px;
  border: 1px solid rgba(0,0,0,0.1);
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

/* Upload Area */
.logo-upload-area {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  align-items: center;
  padding: 20px;
  background: #F8FAFC;
  border: 2px dashed #CBD5E1;
  border-radius: var(--border-radius);
}
.logo-preview {
  width: 120px; 
  height: 120px;
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  background: white;
  display: flex; 
  align-items: center; 
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
.logo-preview img {
  width: 100%; 
  height: 100%;
  object-fit: contain;
  padding: 8px;
}
.logo-controls {
  display: flex; 
  flex-direction: column; 
  gap: 8px;
}

/* Timetable (Period Slot Grid) */
.period-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 6px;
  min-width: 900px;
}
.period-table thead th {
  background: var(--primary);
  color: white;
  padding: 12px 8px;
  text-align: center;
  font-weight: 700;
  border-radius: var(--border-radius);
  font-size: 13px;
  border-bottom: 2px solid var(--secondary);
}
.period-table thead th.day-col { 
  background: var(--primary-dark); 
  width: 100px; 
}
.period-table tbody td { 
  vertical-align: top; 
  padding: 0; 
}
.day-label {
  background: #E2E8F0;
  font-weight: 700;
  padding: 14px 8px;
  text-align: center;
  border-radius: var(--border-radius);
  height: 100%;
  font-size: 13px;
  color: var(--primary);
  border: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}
.period-slot {
  background: #FFFFFF;
  border: 1px dashed #CBD5E1;
  border-radius: var(--border-radius);
  padding: 14px 8px;
  text-align: center;
  cursor: pointer;
  color: var(--text-light);
  font-size: 12px;
  transition: all 0.2s;
  min-height: 90px;
  display: flex; 
  align-items: center; 
  justify-content: center;
}
.period-slot:hover { 
  background: #EFF6FF; 
  border-color: var(--primary); 
  color: var(--primary); 
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}
.period-card {
  border-radius: var(--border-radius);
  padding: 10px;
  cursor: pointer;
  background: color-mix(in srgb, var(--period-color, var(--primary)) 8%, white);
  border: 1px solid color-mix(in srgb, var(--period-color, var(--primary)) 20%, var(--border));
  border-left: 5px solid var(--period-color, var(--primary));
  color: color-mix(in srgb, var(--period-color, var(--primary)) 80%, var(--text));
  font-size: 12px;
  position: relative;
  transition: all 0.2s;
  min-height: 90px;
  display: flex; 
  flex-direction: column; 
  justify-content: space-between;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}
.period-card:hover { 
  transform: translateY(-2px); 
  box-shadow: 0 6px 12px rgba(0,0,0,0.08); 
  background: color-mix(in srgb, var(--period-color, var(--primary)) 12%, white);
}
.period-card .pc-code { 
  font-weight: 700; 
  font-size: 13px; 
  color: color-mix(in srgb, var(--period-color, var(--primary)) 90%, black);
}
.period-card .pc-grade { 
  font-size: 11px; 
  color: color-mix(in srgb, var(--period-color, var(--primary)) 70%, var(--text-light));
  margin-top: 2px;
  line-height: 1.3;
}
.period-card .pc-edit {
  display: flex; 
  align-items: center; 
  gap: 4px;
  font-size: 9px;
  background: color-mix(in srgb, var(--period-color, var(--primary)) 12%, white);
  border: 1px solid color-mix(in srgb, var(--period-color, var(--primary)) 20%, var(--border));
  color: color-mix(in srgb, var(--period-color, var(--primary)) 80%, var(--text-light));
  padding: 2px 6px;
  border-radius: 10px;
  align-self: flex-start;
  margin-top: 6px;
  font-weight: 600;
}

/* Premium Subject Cards (Dashboard & Attendance select cards) */
.subject-card {
  display: flex; 
  align-items: center; 
  gap: 20px;
  padding: 16px 20px;
  border-radius: var(--border-radius);
  background: color-mix(in srgb, var(--subj-color, var(--primary)) 6%, white);
  border: 1px solid color-mix(in srgb, var(--subj-color, var(--primary)) 15%, var(--border));
  border-left: 6px solid var(--subj-color, var(--primary)); /* Accent boundary color */
  color: var(--text);
  margin-bottom: 14px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.subject-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px -2px rgba(0, 0, 0, 0.06);
  background: color-mix(in srgb, var(--subj-color, var(--primary)) 10%, white);
}
.subject-card.is-saved {
  background: color-mix(in srgb, var(--subj-color, var(--primary)) 3%, #F8FAFC);
}
.subject-card .time {
  background: var(--subj-color, var(--primary));
  color: #FFFFFF;
  padding: 8px 12px; 
  border-radius: var(--border-radius);
  font-weight: 700;
  min-width: 96px; 
  text-align: center;
  font-size: 12px;
  line-height: 1.4;
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}
.subject-card .info { 
  flex: 1; 
  min-width: 180px; 
}
.subject-card .info h4 { 
  font-size: 16px; 
  font-weight: 700;
  color: color-mix(in srgb, var(--subj-color, var(--primary)) 85%, black);
  margin-bottom: 4px; 
}
.subject-card .info small { 
  color: color-mix(in srgb, var(--subj-color, var(--primary)) 70%, var(--text-light));
  font-size: 13px;
  font-weight: 600;
}
.subject-card .period-badge {
  background: var(--primary-dark);
  color: #FFFFFF;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  border: 1px solid var(--secondary);
}
.subject-card .btn {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
  transition: all 0.15s;
}
.subject-card .btn:hover {
  background: var(--primary);
  color: white;
}

/* Saved status detail badges */
.saved-status-badge {
  margin-top: 6px;
  font-size: 12px;
  font-weight: 700;
  color: #1E7E34;
  display: flex;
  align-items: center;
  gap: 6px;
}
.saved-status-badge.unsaved {
  color: var(--text-light);
}
.saved-status-detail {
  font-size: 11px;
  font-weight: 600;
  background: #F1F5F9;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text);
  margin-left: 8px;
  display: inline-block;
}

/* Attendance Check Panel */
.attendance-summary {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 20px;
  background: #F8FAFC;
  border-radius: var(--border-radius);
  margin-bottom: 16px;
  border: 1px solid var(--border);
}
.sum-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  background: white;
  border: 1px solid var(--border);
  font-weight: 700;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.sum-pill.present { color: var(--success); border-color: var(--success); }
.sum-pill.late { color: var(--warning); border-color: var(--warning); }
.sum-pill.leave { color: var(--info); border-color: var(--info); }
.sum-pill.absent { color: var(--danger); border-color: var(--danger); }
.sum-pill.total { 
  background: var(--primary); 
  color: white; 
  border-color: var(--primary); 
  margin-left: auto; 
}

/* Checklist Checkin Row */
.student-row {
  display: grid;
  grid-template-columns: 50px 100px 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background-color: #FFFFFF;
}
.student-row:hover { 
  background: #F8FAFC; 
}
.status-buttons { 
  display: flex; 
  gap: 6px; 
}

/* Formal Checklist Status Buttons (Outline Style -> Solid Active Style) */
.status-btn {
  padding: 6px 14px;
  border: 1.5px solid #CBD5E1;
  background: white;
  border-radius: 20px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-light);
  transition: all 0.15s ease-in-out;
}
.status-btn.present { color: var(--success); border-color: var(--success-border); }
.status-btn.present:hover { background: var(--success-bg); }
.status-btn.active.present { background: var(--success); color: white !important; border-color: var(--success); }

.status-btn.absent { color: var(--danger); border-color: var(--danger-border); }
.status-btn.absent:hover { background: var(--danger-bg); }
.status-btn.active.absent { background: var(--danger); color: white !important; border-color: var(--danger); }

.status-btn.late { color: var(--warning); border-color: var(--warning-border); }
.status-btn.late:hover { background: var(--warning-bg); }
.status-btn.active.late { background: var(--warning); color: white !important; border-color: var(--warning); }

.status-btn.leave { color: var(--info); border-color: var(--info-border); }
.status-btn.leave:hover { background: var(--info-bg); }
.status-btn.active.leave { background: var(--info); color: white !important; border-color: var(--info); }

/* Modals & Dialogs */
.modal {
  display: none;
  position: fixed; 
  inset: 0;
  background: rgba(15, 23, 42, 0.6); /* Soft Dark Backdrop */
  z-index: 2000;
  align-items: flex-start; 
  justify-content: center;
  padding: 60px 20px;
  overflow-y: auto;
  backdrop-filter: blur(4px); /* Modern blur effect */
}
.modal.active { 
  display: flex; 
}
.modal-dialog {
  background: white;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  width: 100%; 
  max-width: 600px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  animation: modalSlideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}
@keyframes modalSlideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: #F8FAFC;
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  border-top: 4px solid var(--primary);
}
.modal-header h3 { 
  font-size: 16px; 
  font-weight: 700;
  color: var(--primary);
}
.modal-close { 
  background: none; 
  border: none; 
  font-size: 24px; 
  cursor: pointer; 
  color: var(--text-light); 
  line-height: 1; 
}
.modal-body { 
  padding: 20px 24px; 
}
.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: #F8FAFC;
  display: flex; 
  justify-content: flex-end; 
  gap: 8px;
}

/* Alerts and Badges */
.alert { 
  padding: 12px 18px; 
  border-radius: var(--border-radius); 
  margin-bottom: 16px; 
  border: 1px solid; 
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
}
.alert-info { background: var(--info-bg); border-color: var(--info-border); color: var(--info); }
.alert-success { background: var(--success-bg); border-color: var(--success-border); color: var(--success); }
.alert-warning { background: var(--warning-bg); border-color: var(--warning-border); color: #856404; }
.alert-danger { background: var(--danger-bg); border-color: var(--danger-border); color: var(--danger); }

.badge {
  display: inline-block; 
  padding: 4px 10px;
  background: var(--primary); 
  color: white;
  border-radius: 4px; 
  font-size: 11px; 
  font-weight: 700;
}
.badge-success { background: var(--success); }
.badge-danger { background: var(--danger); }
.badge-warning { background: var(--warning); }
.badge-info { background: var(--info); }

/* Toasts */
.toast {
  position: fixed; 
  bottom: 24px; 
  right: 24px;
  background: var(--text); 
  color: white;
  padding: 14px 24px; 
  border-radius: var(--border-radius);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  z-index: 3000;
  opacity: 0; 
  transform: translateY(15px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1); 
  pointer-events: none;
  font-weight: 700;
  font-size: 13px;
  border-left: 4px solid var(--secondary); /* Golden state boundary line */
}
.toast.show { 
  opacity: 1; 
  transform: translateY(0); 
}
.toast.success { background: #1B4D3E; border-left-color: var(--success); }
.toast.danger { background: #4D1B1B; border-left-color: var(--danger); }
.toast.warning { background: #4D3D1B; border-left-color: var(--warning); }

.action-btns {
  display: flex;
  gap: 6px;
}
.icon-btn {
  width: 32px; 
  height: 32px;
  border: 1px solid var(--border); 
  border-radius: var(--border-radius);
  cursor: pointer;
  display: inline-flex; 
  align-items: center; 
  justify-content: center;
  transition: all 0.15s;
  background: white;
  font-size: 14px;
}
.icon-btn.edit { color: #B45309; }
.icon-btn.edit:hover { background: #FEF3C7; border-color: #B45309; }
.icon-btn.delete { color: var(--danger); }
.icon-btn.delete:hover { background: var(--danger-bg); border-color: var(--danger); }

/* Grade Score Grid - High Density administrative style */
.score-table { 
  font-size: 13px; 
}
.score-table th, .score-table td {
  padding: 10px;
  text-align: center;
  border: 1px solid var(--border);
}
.score-table th:first-child, .score-table td:first-child {
  position: sticky; 
  left: 0;
  background: white;
  z-index: 2;
  text-align: left;
  border-right: 2px solid var(--border);
  min-width: 60px;
}
.score-table thead th {
  background: var(--primary);
  color: white;
  position: sticky; 
  top: 0;
  z-index: 3;
  white-space: nowrap;
  border-bottom: 2px solid var(--secondary);
}
.score-table thead th:first-child {
  background: var(--primary);
  color: white;
  z-index: 4;
}
.score-table thead th .col-label {
  font-size: 12px;
  font-weight: 700;
  display: block;
}
.score-table thead th .col-max {
  font-size: 10px;
  opacity: 0.9;
  font-weight: 600;
  margin-top: 2px;
  color: var(--secondary-light);
}
.score-table thead th .col-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 6px;
  padding: 3px 8px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.25);
  color: white;
  border-radius: 12px;
  cursor: pointer;
  font-size: 10px;
  transition: all 0.15s;
  font-weight: 700;
}
.score-table thead th .col-toggle-btn:hover {
  background: rgba(255,255,255,0.25);
}
.score-table .student-info {
  text-align: left;
  min-width: 170px;
  position: sticky; 
  left: 60px;
  background: white;
  z-index: 2;
  border-right: 2px solid var(--border);
}
.score-table tbody tr:nth-child(even) .student-info { 
  background: #F8FAFC; 
}
.score-table .score-input {
  width: 55px;
  padding: 4px 6px;
  border: 1px solid #CBD5E1;
  border-radius: var(--border-radius);
  text-align: center;
  font-size: 12px;
}
.score-table .score-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(27, 54, 93, 0.15);
}

/* Formal Checklist Checkboxes */
.score-checkbox-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  width: 26px;
  height: 26px;
}
.score-checkbox-wrap input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  margin: 0;
  z-index: 2;
}
.score-checkbox-wrap .checkmark {
  width: 22px;
  height: 22px;
  border: 2px solid #CBD5E1;
  border-radius: 4px;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s;
}
.score-checkbox-wrap input[type="checkbox"]:checked + .checkmark {
  background: var(--success);
  border-color: var(--success);
}
.score-checkbox-wrap input[type="checkbox"]:checked + .checkmark::after {
  content: '';
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}
.score-checkbox-wrap:hover .checkmark {
  border-color: var(--primary);
}

.score-table .total-cell {
  font-weight: 700;
  background: #EFF6FF;
  color: var(--primary);
}
.score-table tfoot td {
  background: #F1F5F9;
  font-weight: 700;
  padding: 12px 10px;
  color: var(--primary);
  border-top: 2px solid var(--primary);
}

/* Bulk Action Bar */
.bulk-action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  border-radius: var(--border-radius);
  padding: 12px 20px;
  margin-bottom: 16px;
  animation: slideDown 0.15s ease-out;
  font-size: 13px;
}
.bulk-action-bar i { 
  color: var(--primary); 
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.data-table input[type="checkbox"] {
  width: 18px; 
  height: 18px;
  cursor: pointer;
  accent-color: var(--primary);
}
.data-table tbody tr.row-selected {
  background: #EFF6FF !important;
}

/* Responsive adjust */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.active { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
  .menu-toggle { display: block; }
  .student-row { grid-template-columns: 40px 1fr; gap: 8px; }
  .student-row .status-buttons { grid-column: 1 / -1; margin-top: 4px; }
  .logo-upload-area { grid-template-columns: 1fr; }
  .logo-preview { margin: 0 auto; }
}