:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --danger: #b91c1c;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 8px rgba(17, 24, 39, 0.05);
}

.site-header__content {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-header__logo {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
}

.site-header__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}

.site-header__subtitle {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-wrap {
  max-width: 1080px;
  margin: 28px auto;
  padding: 0 18px;
}

.card {
  max-width: 460px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

.card h1 {
  margin: 0 0 16px;
  font-size: 1.4rem;
}

.alert {
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: 0.92rem;
}

.alert--error {
  color: var(--danger);
  background: #fee2e2;
  border: 1px solid #fecaca;
}

.alert--success {
  color: #166534;
  background: #dcfce7;
  border: 1px solid #bbf7d0;
}

.form-group {
  margin-bottom: 12px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.92rem;
  color: var(--muted);
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.95rem;
}

.form-input:focus {
  outline: none;
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn {
  display: inline-block;
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

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

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

.btn--secondary {
  color: #111827;
  background: #eef2ff;
  border: 1px solid #dbe3ff;
}

.btn--secondary:hover {
  background: #e0e7ff;
}

.btn--danger {
  color: #fff;
  background: #dc2626;
}

.btn--danger:hover {
  background: #b91c1c;
}

.btn--sm {
  padding: 7px 10px;
  font-size: 0.84rem;
}

.header-menu-wrap {
  position: relative;
}

.header-popup-menu {
  position: absolute;
  right: 0;
  top: 44px;
  min-width: 190px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  z-index: 50;
  overflow: hidden;
}

.header-popup-menu a {
  display: block;
  padding: 10px 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
}

.header-popup-menu a:hover {
  background: #f3f4f6;
}

.card--wide {
  max-width: 100%;
}

.page-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.table-wrap {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--border);
  padding: 9px 10px;
  text-align: left;
  vertical-align: middle;
  font-size: 0.9rem;
}

.data-table thead th {
  background: #f9fafb;
  font-weight: 700;
}

.inline-form {
  display: inline;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px 14px;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.stat-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f9fbff;
  padding: 12px;
}

.stat-card__label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.88rem;
}

.stat-card__value {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 700;
}

.section-title {
  margin: 0 0 14px;
  font-size: 1.1rem;
}

.filters-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 14px;
  align-items: end;
  margin-bottom: 14px;
}

.filter-item {
  margin-bottom: 0;
}

.filter-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.text-negative {
  color: var(--danger);
  font-weight: 700;
}

.inactive-student-row td {
  color: var(--danger);
}

.muted-link {
  color: var(--primary);
  text-decoration: none;
}

.muted-link:hover {
  text-decoration: underline;
}

.page-intro {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.5;
}

.page-intro--compact {
  margin-top: 16px;
  margin-bottom: 0;
}

.teacher-contact-card {
  max-width: 760px;
}

.teacher-pick-form {
  margin-bottom: 18px;
}

.teacher-form-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.teacher-contact-summary {
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f9fafb;
}

.teacher-contact-summary p {
  margin: 0 0 8px;
}

.teacher-contact-summary p:last-child {
  margin-bottom: 0;
}

.teacher-contact-empty {
  margin: 0;
  color: var(--muted);
}

@media print {
  .no-print,
  .site-header {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .page-wrap {
    max-width: 100%;
    margin: 0;
    padding: 0;
  }

  .card {
    border: 0;
    box-shadow: none;
    padding: 0;
  }

  .inactive-student-row td {
    color: #b91c1c !important;
  }
}