/* ============================================
   Student Management Dashboard — style.css
   ============================================ */

/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:            #f4f6fb;
  --surface:       #ffffff;
  --primary:       #185FA5;
  --primary-dark:  #0C447C;
  --primary-light: #E6F1FB;
  --danger:        #A32D2D;
  --danger-bg:     #FCEBEB;
  --success:       #3B6D11;
  --success-bg:    #EAF3DE;
  --amber:         #854F0B;
  --amber-bg:      #FAEEDA;
  --purple:        #3C3489;
  --purple-bg:     #EEEDFE;
  --teal:          #0F6E56;
  --teal-bg:       #E1F5EE;
  --pink:          #993556;
  --pink-bg:       #FBEAF0;
  --text:          #1a1a1a;
  --text-2:        #555555;
  --text-3:        #888888;
  --border:        #e0e0e0;
  --radius:        10px;
  --radius-lg:     14px;
  --shadow:        0 2px 12px rgba(0, 0, 0, 0.07);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Navigation Bar ── */
nav {
  background: var(--primary);
  color: #ffffff;
  padding: 0 2rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.brand {
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand svg {
  width: 24px;
  height: 24px;
  fill: #ffffff;
}

.nav-right {
  font-size: 13px;
  opacity: 0.85;
}

/* ── Page Container ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ── Stats Cards ── */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 14px;
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.stat-body .num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
}

.stat-body .lbl {
  font-size: 12px;
  color: var(--text-2);
  margin-top: 3px;
}

/* ── Toolbar ── */
.toolbar {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.toolbar input,
.toolbar select {
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.15s;
}

.toolbar input {
  flex: 1;
  min-width: 180px;
}

.toolbar input:focus,
.toolbar select:focus {
  border-color: var(--primary);
}

.toolbar select {
  min-width: 160px;
}

/* ── Buttons ── */
.btn {
  height: 38px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.btn:hover    { background: var(--bg); }
.btn:active   { transform: scale(0.97); }

.btn.primary  { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-dark); }

.btn.danger   { color: var(--danger); border-color: #f0c0c0; }
.btn.danger:hover { background: var(--danger-bg); }

.btn.sm       { height: 30px; padding: 0 10px; font-size: 12px; }

/* ── Table Card ── */
.table-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

.table-header h2 { font-size: 15px; font-weight: 600; }
.table-header span { font-size: 12px; color: var(--text-3); }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #fafafa;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

th:hover          { background: #f0f0f0; }
th .sort-icon     { opacity: 0.4; font-size: 11px; margin-left: 3px; }
th.sorted .sort-icon { opacity: 1; color: var(--primary); }

td {
  padding: 11px 14px;
  border-bottom: 1px solid #f2f2f2;
  vertical-align: middle;
}

tr:last-child td  { border-bottom: none; }
tr:hover td       { background: #fafcff; }

/* ── Avatar ── */
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.name-cell { display: flex; align-items: center; gap: 10px; }
.name-cell .info .name  { font-weight: 500; font-size: 13px; }
.name-cell .info .email { font-size: 11px; color: var(--text-3); }

/* ── Badges ── */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
}

/* Grade badges */
.g-a { background: var(--success-bg); color: var(--success); }
.g-b { background: var(--primary-light); color: var(--primary); }
.g-c { background: var(--amber-bg); color: var(--amber); }
.g-f { background: var(--danger-bg); color: var(--danger); }

/* Department badges */
.d-sci  { background: var(--purple-bg); color: var(--purple); }
.d-math { background: var(--teal-bg);   color: var(--teal);   }
.d-eng  { background: var(--amber-bg);  color: var(--amber);  }
.d-art  { background: var(--pink-bg);   color: var(--pink);   }
.d-cs   { background: var(--primary-light); color: var(--primary); }

/* ── Empty State ── */
.empty {
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-3);
}
.empty .icon { font-size: 48px; margin-bottom: 12px; }
.empty p     { font-size: 14px; }

/* ── Bulk Action Bar ── */
#bulk-bar {
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--primary-light);
  border-radius: var(--radius);
  padding: 8px 14px;
  margin-bottom: 1rem;
  font-size: 13px;
}

#bulk-bar.show { display: flex; }

/* ── Add/Edit Modal ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  animation: slideUp 0.2s ease;
}

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

.modal-head {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-head h2 { font-size: 16px; font-weight: 600; }

.modal-body { padding: 1.5rem; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-row.full { grid-column: span 2; }

.form-row label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
}

.form-row input,
.form-row select {
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.15s;
}

.form-row input:focus,
.form-row select:focus {
  border-color: var(--primary);
  background: #fff;
}

.form-row input.error { border-color: var(--danger); }

.error-msg {
  font-size: 11px;
  color: var(--danger);
  min-height: 14px;
}

.modal-foot {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ── Confirm Dialog ── */
.confirm-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 110;
  align-items: center;
  justify-content: center;
}

.confirm-overlay.open { display: flex; }

.confirm-box {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  text-align: center;
}

.confirm-box .icon    { font-size: 40px; margin-bottom: 12px; }
.confirm-box h3       { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.confirm-box p        { font-size: 13px; color: var(--text-2); margin-bottom: 1.5rem; }
.confirm-btns         { display: flex; gap: 10px; justify-content: center; }

/* ── Toast Notification ── */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #222;
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 13px;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  white-space: nowrap;
}

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

/* ── Responsive ── */
@media (max-width: 640px) {
  nav              { padding: 0 1rem; }
  .container       { padding: 1rem; }
  .stats           { grid-template-columns: 1fr 1fr; }
  .form-grid       { grid-template-columns: 1fr; }
  .form-row.full   { grid-column: span 1; }
}