:root,
:root[data-theme="dark"] {
  --bg: #0F1117;
  --card-bg: #1A1D29;
  --input-bg: #12141C;
  --cyan: #22D3EE;
  --purple: #A78BFA;
  --text: #E5E7EB;
  --text-dim: #9CA3AF;
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.18);
  --danger: #F87171;
  --warn: #FBBF24;
  --overlay-bg: rgba(6, 7, 12, 0.62);
  --surface-tint: rgba(255, 255, 255, 0.03);
  --btn-text-on-gradient: #0F1117;
}

:root[data-theme="light"] {
  --bg: #F3F5FA;
  --card-bg: #FFFFFF;
  --input-bg: #F1F3F9;
  --cyan: #0E7490;
  --purple: #7C3AED;
  --text: #1B1E2B;
  --text-dim: #6B7280;
  --border: rgba(15, 17, 23, 0.10);
  --border-strong: rgba(15, 17, 23, 0.24);
  --danger: #DC2626;
  --warn: #D97706;
  --overlay-bg: rgba(30, 32, 45, 0.45);
  --surface-tint: rgba(15, 17, 23, 0.04);
  --btn-text-on-gradient: #FFFFFF;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.15s, color 0.15s;
}

a {
  color: inherit;
}

.gradient-text {
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Login page ---------- */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(circle at 15% 20%, rgba(34, 211, 238, 0.12), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(167, 139, 250, 0.14), transparent 45%),
    var(--bg);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 40px 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.login-logo {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}

.login-subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 28px;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.btn-primary {
  width: 100%;
  padding: 13px 14px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  color: var(--btn-text-on-gradient);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-primary:active {
  transform: scale(0.98);
}

.error-banner {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: var(--danger);
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 10px;
  margin-bottom: 18px;
}

/* ---------- Panel layout ---------- */

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  flex-shrink: 0;
  background: var(--card-bg);
  border-right: 1px solid var(--border);
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
}

.sidebar .logo {
  font-size: 21px;
  font-weight: 800;
  margin-bottom: 6px;
  padding: 0 10px;
}

.sidebar .logo-subtitle {
  font-size: 12px;
  color: var(--text-dim);
  padding: 0 10px;
  margin-bottom: 30px;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
  border: 1px solid transparent;
}

.nav-link .icon {
  font-size: 16px;
  width: 18px;
  text-align: center;
}

.nav-link:hover {
  background: rgba(34, 211, 238, 0.06);
  color: var(--text);
}

.nav-link.active {
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.14), rgba(167, 139, 250, 0.14));
  color: var(--cyan);
  border-color: rgba(34, 211, 238, 0.25);
}

.nav-link.logout {
  color: var(--danger);
  margin-top: 12px;
}

.nav-link.logout:hover {
  background: rgba(248, 113, 113, 0.08);
}

.main {
  flex: 1;
  padding: 32px 40px;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.topbar h1 {
  font-size: 24px;
  margin: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}

.theme-toggle-btn:hover {
  border-color: var(--cyan);
}

.theme-toggle-btn:active {
  transform: scale(0.92);
}

.theme-toggle-floating {
  position: fixed;
  top: 20px;
  right: 20px;
}

.admin-pill {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
}

.admin-pill strong {
  color: var(--text);
}

/* ---------- Dashboard stat cards ---------- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.stat-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 24px;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
}

.stat-icon {
  font-size: 22px;
  margin-bottom: 14px;
  opacity: 0.9;
}

.stat-value {
  font-size: 30px;
  font-weight: 800;
}

.stat-label {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ---------- Placeholder pages ---------- */

.placeholder-box {
  background: var(--card-bg);
  border: 1px dashed var(--border);
  border-radius: 16px;
  padding: 70px 24px;
  text-align: center;
  color: var(--text-dim);
}

.placeholder-box .big-icon {
  font-size: 36px;
  margin-bottom: 14px;
}

.placeholder-box h2 {
  color: var(--text);
  margin: 0 0 8px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s, border-color 0.15s;
  white-space: nowrap;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-accent {
  border: none;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  color: var(--btn-text-on-gradient);
}

.btn-secondary {
  background: transparent;
  color: var(--text-dim);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-danger {
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.3);
  color: var(--danger);
}

.btn-danger:hover {
  background: rgba(248, 113, 113, 0.2);
}

.btn-warn {
  background: rgba(251, 191, 36, 0.12);
  border-color: rgba(251, 191, 36, 0.3);
  color: var(--warn);
}

.btn-warn:hover {
  background: rgba(251, 191, 36, 0.2);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 8px;
}

/* ---------- Page furniture ---------- */

.page-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-bar input,
.filter-bar select {
  padding: 9px 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 13px;
  outline: none;
}

.filter-bar input:focus,
.filter-bar select:focus {
  border-color: var(--cyan);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 16px;
}

.back-link:hover {
  color: var(--cyan);
}

.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.detail-header-info h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

.detail-header-info .meta {
  color: var(--text-dim);
  font-size: 13px;
}

.detail-header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.section {
  margin-bottom: 30px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.section-header h3 {
  margin: 0;
  font-size: 16px;
}

/* ---------- Data table ---------- */

.table-wrap {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.data-table thead th {
  text-align: left;
  padding: 14px 18px;
  color: var(--text-dim);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  user-select: none;
  white-space: nowrap;
}

.data-table thead th[data-sort] {
  cursor: pointer;
}

.data-table thead th[data-sort]:hover {
  color: var(--text);
}

.data-table thead th.sort-asc::after {
  content: " \2191";
}

.data-table thead th.sort-desc::after {
  content: " \2193";
}

.data-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}

.data-table tbody tr:last-child {
  border-bottom: none;
}

.data-table tbody tr.clickable {
  cursor: pointer;
}

.data-table tbody tr.clickable:hover {
  background: rgba(34, 211, 238, 0.05);
}

.data-table td {
  padding: 13px 18px;
  vertical-align: middle;
}

.data-table td.dim {
  color: var(--text-dim);
}

.num-col-header,
.data-table td.num-col {
  width: 48px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.row-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.table-empty,
.table-loading {
  padding: 46px 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13.5px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  background: rgba(167, 139, 250, 0.14);
  color: var(--purple);
  border: 1px solid rgba(167, 139, 250, 0.25);
}

.badge-cyan {
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
  border-color: rgba(34, 211, 238, 0.25);
}

.badge-warn {
  background: rgba(251, 191, 36, 0.12);
  color: var(--warn);
  border-color: rgba(251, 191, 36, 0.3);
}

.row-archived {
  opacity: 0.55;
}

/* ---------- Info cards on detail pages ---------- */

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 20px;
}

.info-card .info-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.info-card .info-value {
  font-size: 17px;
  font-weight: 700;
}

/* ---------- Login/parol karta (profil sahifalarida) ---------- */

.password-card {
  max-width: 320px;
}

.password-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.password-row .info-value {
  font-family: "Consolas", "SFMono-Regular", Menlo, monospace;
  letter-spacing: 1px;
}

/* ---------- Chips (subject tags etc) ---------- */

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px 6px 12px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text);
}

.chip .chip-remove {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(248, 113, 113, 0.14);
  color: var(--danger);
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
}

.chip .chip-remove:hover {
  background: rgba(248, 113, 113, 0.28);
}

.empty-note {
  color: var(--text-dim);
  font-size: 13px;
}

/* ---------- Modal ---------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
}

.modal-overlay.hidden {
  display: none;
}

.modal-box {
  width: 100%;
  max-width: 460px;
  max-height: 88vh;
  overflow-y: auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
}

.modal-box h3 {
  margin: 0 0 18px;
  font-size: 18px;
}

.modal-text {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 22px;
}

.checkbox-list {
  max-height: 190px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 4px;
  background: var(--input-bg);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  font-size: 13.5px;
  border-radius: 8px;
}

.checkbox-row:hover {
  background: var(--surface-tint);
}

.checkbox-row input {
  accent-color: var(--cyan);
  width: 15px;
  height: 15px;
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  bottom: 26px;
  right: 26px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 13.5px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  z-index: 1100;
  max-width: 340px;
}

.toast.hidden {
  display: none;
}

.toast.error {
  border-color: rgba(248, 113, 113, 0.4);
  color: var(--danger);
}

.toast.success {
  border-color: rgba(34, 211, 238, 0.4);
  color: var(--cyan);
}

/* ---------- Utilities ---------- */

.hidden {
  display: none;
}

/* ---------- Timetable grid (Dars jadvali) ---------- */

.timetable {
  table-layout: fixed;
}

.timetable th.time-col-header,
.timetable td.time-col {
  width: 92px;
}

.timetable td.time-col {
  color: var(--text-dim);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
  background: var(--surface-tint);
}

.timetable th {
  text-align: center;
}

.timetable .slot-cell {
  cursor: pointer;
  text-align: center;
  vertical-align: middle;
  padding: 12px 8px;
  transition: background 0.12s;
}

.timetable .slot-empty {
  color: var(--text-dim);
  font-size: 17px;
  opacity: 0.3;
}

.timetable .slot-empty:hover {
  background: rgba(34, 211, 238, 0.07);
  opacity: 0.9;
}

.timetable .slot-filled {
  background: rgba(167, 139, 250, 0.08);
}

.timetable .slot-filled:hover {
  background: rgba(167, 139, 250, 0.17);
}

.timetable .slot-subject {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.timetable .slot-teacher {
  font-size: 11.5px;
  color: var(--text-dim);
  margin-top: 3px;
}

.modal-static {
  padding: 10px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
}

/* ---------- Grades page ---------- */

.grade-chip .grade-date {
  color: var(--text-dim);
  font-size: 11px;
}

.quick-grade-form {
  display: flex;
  align-items: center;
  gap: 6px;
}

.quick-grade-input {
  width: 72px;
  padding: 8px 10px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  outline: none;
}

.quick-grade-input:focus {
  border-color: var(--cyan);
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 16px;
  }

  .sidebar .logo,
  .sidebar .logo-subtitle {
    padding: 0 4px;
  }

  .sidebar .logo-subtitle {
    margin-bottom: 14px;
  }

  .sidebar nav {
    flex-direction: row;
    overflow-x: auto;
    gap: 6px;
  }

  .nav-link {
    white-space: nowrap;
  }

  .nav-link.logout {
    margin-top: 0;
  }

  .main {
    padding: 24px 18px;
  }

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

  .data-table {
    min-width: 560px;
  }
}