/* ============================================================
   EduCore SMS — Global Design System  v2.0  (Mobile-First)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Variables — Dark Theme (default) ──────────────────── */
:root {
  --bg-dark: #0f1117;
  --bg-sidebar: #161b27;
  --bg-card: #1e2435;
  --bg-panel: #1e2435;
  --bg-input: #252c3d;
  --bg-hover: #2a3248;

  --accent: #4f7cff;
  --accent-hover: #3a68f5;
  --accent-light: rgba(79, 124, 255, 0.12);
  --primary: #4f7cff;
  --primary-hover: #3a68f5;

  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #38bdf8;

  --text-primary: #e8ecf5;
  --text: #e8ecf5;
  --text-muted: #8892aa;
  --text-dim: #4c5670;

  --border: #2d3555;
  --border-light: #1e2535;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);

  --sidebar-w: 240px;
  --header-h: 60px;
  --transition: 0.2s ease;
}

/* ── CSS Variables — Light Theme ────────────────────────────── */
[data-theme="light"] {
  --bg-dark: #f0f4f8;
  --bg-sidebar: #1e293b;
  --bg-card: #ffffff;
  --bg-panel: #ffffff;
  --bg-input: #f1f5f9;
  --bg-hover: #e8eef6;

  --accent: #3b6cf6;
  --accent-hover: #2653d4;
  --accent-light: rgba(59, 108, 246, 0.10);
  --primary: #3b6cf6;
  --primary-hover: #2653d4;

  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #0284c7;

  --text-primary: #0f172a;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --border: #e2e8f0;
  --border-light: #f1f5f9;

  --shadow: 0 4px 20px rgba(15, 23, 42, 0.10);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.07);
}

/* ── Smooth theme transition ────────────────────────────────── */
*, *::before, *::after {
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.15s ease;
}


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

html {
  height: 100%;
  font-size: 14px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  display: block;
}

/* ── Sidebar overlay (mobile) ──────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 99;
  backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
  display: block;
}

/* ── Layout ────────────────────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.sidebar-logo {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-logo .app-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
}

.sidebar-logo .app-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 6px;
  transition: color var(--transition);
}

.sidebar-close:hover {
  color: var(--text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
}

.nav-section-label {
  padding: 12px 20px 4px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-dim);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  color: var(--text-muted);
  font-size: 13.5px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--accent-light);
  color: var(--accent);
  border-left: 3px solid var(--accent);
}

.nav-item .icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
}

.user-info {
  display: flex;
  gap: 10px;
  align-items: center;
}

.user-avatar {
  width: 36px;
  height: 36px;
  background: var(--accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent);
  font-size: 13px;
  flex-shrink: 0;
}

.user-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.user-role {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: capitalize;
}

.logout-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  margin-top: 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  width: 100%;
  transition: all var(--transition);
  font-family: inherit;
}

.logout-btn:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--danger);
  color: var(--danger);
}

/* Main content */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

.topbar {
  height: var(--header-h);
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 90;
}

/* hamburger */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
  flex-shrink: 0;
}

.menu-toggle:hover {
  color: var(--text-primary);
}

.topbar-title {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.topbar-right .date-badge {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.page-content {
  padding: 24px;
  flex: 1;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
}

.breadcrumb {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ── Cards ────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
}

/* Stat grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.stat-label {
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
}

.stat-value.accent {
  color: var(--accent);
}

.stat-value.success {
  color: var(--success);
}

.stat-value.warning {
  color: var(--warning);
}

.stat-value.danger {
  color: var(--danger);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.btn-success:hover {
  background: rgba(34, 197, 94, 0.25);
  color: var(--success);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
  color: var(--danger);
}

.btn-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.btn-warning:hover {
  background: rgba(245, 158, 11, 0.25);
  color: var(--warning);
}

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

.btn-xs {
  padding: 4px 9px;
  font-size: 11.5px;
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
}

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

/* ── Forms ────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 7px;
}

.form-label .required {
  color: var(--danger);
  margin-left: 3px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 124, 255, 0.15);
}

.form-control::placeholder {
  color: var(--text-dim);
}

.form-control-sm {
  padding: 7px 10px;
  font-size: 13px;
}

select.form-control {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%238892aa'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
}

select.form-control option {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

textarea.form-control {
  resize: vertical;
  min-height: 80px;
}

.form-check {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.form-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.form-check label {
  font-size: 13.5px;
  cursor: pointer;
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 5px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

/* ── Tables ───────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  display: block;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}

thead tr {
  border-bottom: 1px solid var(--border);
}

th {
  padding: 11px 14px;
  text-align: left;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  white-space: nowrap;
  background: var(--bg-card);
  position: sticky;
  top: 0;
}

td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-light);
  font-size: 13.5px;
  vertical-align: middle;
}

tbody tr {
  transition: background var(--transition);
}

tbody tr:hover {
  background: var(--bg-hover);
}

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

/* ── Badges ───────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  white-space: nowrap;
}

.badge-active {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.badge-inactive {
  background: rgba(100, 116, 139, 0.15);
  color: var(--text-muted);
}

.badge-core {
  background: rgba(79, 124, 255, 0.15);
  color: var(--accent);
}

.badge-noncore {
  background: rgba(100, 116, 139, 0.12);
  color: var(--text-muted);
}

.badge-incomplete {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.badge-complete {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

/* Grade & Division */
.grade-pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  min-width: 36px;
  text-align: center;
}

.grade-D1 {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
}

.grade-D2 {
  background: rgba(74, 222, 128, 0.15);
  color: #86efac;
}

.grade-C3 {
  background: rgba(56, 189, 248, 0.2);
  color: var(--info);
}

.grade-C4 {
  background: rgba(56, 189, 248, 0.15);
  color: #7dd3fc;
}

.grade-C5 {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.grade-C6 {
  background: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

.grade-P7 {
  background: rgba(251, 146, 60, 0.2);
  color: #fb923c;
}

.grade-P8 {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
}

.grade-F9 {
  background: rgba(239, 68, 68, 0.25);
  color: var(--danger);
}

.div-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 14px;
}

.div-1 {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
}

.div-2 {
  background: rgba(56, 189, 248, 0.2);
  color: var(--info);
}

.div-3 {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.div-4 {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
}

.div-U {
  background: rgba(239, 68, 68, 0.25);
  color: var(--danger);
}

/* ── Alerts / Flash ──────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 13.5px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-success {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: var(--success);
}

.alert-error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--warning);
}

.alert-info {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--info);
}

/* ── Login ────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: var(--bg-dark);
  background-image: radial-gradient(ellipse at 20% 50%, rgba(79, 124, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(79, 124, 255, 0.05) 0%, transparent 50%);
}

.login-box {
  width: 100%;
  max-width: 420px;
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo .logo-icon {
  font-size: 44px;
  margin-bottom: 10px;
}

.login-logo h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.login-logo p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}

.login-card h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 22px;
}

/* ── Marks entry ──────────────────────────────────────────── */
.marks-input {
  width: 90px;
  text-align: center;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 7px 10px;
  font-size: 13.5px;
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
}

.marks-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 124, 255, 0.15);
}

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

.marks-input.ok {
  border-color: var(--success);
}

/* ── Utilities ────────────────────────────────────────────── */
.mt-0 {
  margin-top: 0 !important;
}

.mt-1 {
  margin-top: 8px !important;
}

.mt-2 {
  margin-top: 16px !important;
}

.mt-3 {
  margin-top: 24px !important;
}

.mb-0 {
  margin-bottom: 0 !important;
}

.mb-1 {
  margin-bottom: 8px !important;
}

.mb-2 {
  margin-bottom: 16px !important;
}

.mb-3 {
  margin-bottom: 24px !important;
}

.text-muted {
  color: var(--text-muted) !important;
}

.text-center {
  text-align: center !important;
}

.text-right {
  text-align: right !important;
}

.text-success {
  color: var(--success) !important;
}

.text-danger {
  color: var(--danger) !important;
}

.text-warning {
  color: var(--warning) !important;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
}

.gap-1 {
  gap: 8px;
}

.gap-2 {
  gap: 16px;
}

.flex-wrap {
  flex-wrap: wrap;
}

.justify-between {
  justify-content: space-between;
}

.w-full {
  width: 100%;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 42px;
  margin-bottom: 12px;
  opacity: 0.4;
}

.empty-state p {
  font-size: 14px;
}

/* ── Toast ───────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: calc(100vw - 32px);
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  font-size: 13.5px;
  min-width: 240px;
  max-width: 360px;
  box-shadow: var(--shadow);
  animation: slideIn 0.25s ease;
}

.toast.success {
  border-left: 3px solid var(--success);
}

.toast.error {
  border-left: 3px solid var(--danger);
}

.toast.info {
  border-left: 3px solid var(--accent);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(24px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── Results ─────────────────────────────────────────────── */
.result-table th {
  font-size: 10.5px;
}

.result-table td {
  font-size: 12.5px;
  padding: 10px 12px;
}

.student-rank {
  font-size: 12px;
  color: var(--text-dim);
  font-weight: 600;
}

/* ================================================================
   RESPONSIVE — Mobile First
   ================================================================ */

/* ── Tablet (≤900px): sidebar collapses ───────────────────── */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-close {
    display: block;
  }

  .main-content {
    margin-left: 0;
  }

  .menu-toggle {
    display: flex;
  }
}

/* ── Small tablet / large mobile (≤768px) ─────────────────── */
@media (max-width: 768px) {
  .page-content {
    padding: 16px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .form-row-3 {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stat-value {
    font-size: 22px;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-header-actions {
    width: 100%;
  }

  .card {
    padding: 16px;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Two-column grids in views collapse */
  div[style*="grid-template-columns:1fr 1fr"],
  div[style*="grid-template-columns: 1fr 1fr"] {
    display: block !important;
  }

  div[style*="grid-template-columns:1fr 1fr"]>*,
  div[style*="grid-template-columns: 1fr 1fr"]>* {
    margin-bottom: 16px;
  }

  table {
    min-width: 500px;
  }

  .topbar {
    padding: 0 16px;
    gap: 8px;
  }

  .topbar-title {
    font-size: 15px;
  }

  .topbar-right .date-badge {
    display: none;
  }
}

/* ── Mobile (≤480px) ──────────────────────────────────────── */
@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-card {
    padding: 14px;
  }

  .stat-value {
    font-size: 20px;
  }

  .stat-label {
    font-size: 10px;
  }

  .btn {
    font-size: 12.5px;
    padding: 8px 14px;
  }

  .btn-sm {
    font-size: 11.5px;
    padding: 5px 10px;
  }

  .login-card {
    padding: 24px 20px;
  }

  #toast-container {
    top: auto;
    bottom: 16px;
    right: 8px;
    left: 8px;
  }

  .toast {
    min-width: unset;
    max-width: 100%;
  }

  .table-wrapper {
    border-radius: var(--radius);
    overflow: hidden;
  }

  .page-content {
    padding: 12px;
  }
}

/* ── Mobile Card Tables (Generic) ─────────────────────────── */
@media (max-width: 768px) {
  .table-mobile-cards table, .table-mobile-cards tbody {
    display: block;
    width: 100%;
  }
  .table-mobile-cards thead {
    display: none;
  }
  .table-mobile-cards tr {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    padding: 16px;
    position: relative;
    box-shadow: var(--shadow-sm);
  }
  .table-mobile-cards td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border: none;
    text-align: right;
  }
  .table-mobile-cards td::before {
    content: attr(data-label);
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    margin-right: 16px;
    text-align: left;
  }
  .table-mobile-cards td.actions-cell {
    margin-top: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .table-mobile-cards td.actions-cell::before {
    display: none; /* Hide label for actions */
  }
  .table-mobile-cards td.actions-cell .btn {
    width: 100%;
    justify-content: center;
    margin: 0 !important;
  }

  /* Profile View Mobile Overrides */
  .profile-layout {
    grid-template-columns: 1fr !important;
  }
  .tabs-header {
    flex-wrap: wrap !important;
    gap: 8px !important;
  }
  .academic-row {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 16px !important;
  }
  .academic-snapshot {
    flex-direction: column !important;
    gap: 12px !important;
    align-items: stretch !important;
    width: 100% !important;
  }
  .academic-snapshot > div {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    text-align: left !important;
    width: 100%;
    border-left: none !important;
    padding-left: 0 !important;
  }
  .mobile-grid-stack {
    grid-template-columns: 1fr !important;
  }
  .mobile-stack {
    flex-direction: column !important;
    align-items: stretch !important;
  }
  .ledger-details {
    flex-direction: column !important;
    gap: 12px !important;
  }
  .ledger-details > div {
    border-left: none !important;
    padding-left: 0 !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
  }
  .hide-on-mobile {
    display: none !important;
  }
}

/* ── Desktop-only hide ── */
@media (min-width: 769px) {
  .hide-on-desktop {
    display: none !important;
  }
}

/* ── Grade pill base (used in marks entry cards) ── */
.grade-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 800;
    background: var(--bg-input);
    color: var(--text-muted);
}
.grade-pill.grade-D1 { background: rgba(34,197,94,0.15); color: #16a34a; }
.grade-pill.grade-D2 { background: rgba(34,197,94,0.10); color: #22c55e; }
.grade-pill.grade-C3 { background: rgba(59,130,246,0.12); color: #3b82f6; }
.grade-pill.grade-C4 { background: rgba(59,130,246,0.08); color: #60a5fa; }
.grade-pill.grade-C5 { background: rgba(234,179,8,0.12); color: #ca8a04; }
.grade-pill.grade-C6 { background: rgba(234,179,8,0.08); color: #eab308; }
.grade-pill.grade-P7 { background: rgba(249,115,22,0.10); color: #f97316; }
.grade-pill.grade-P8 { background: rgba(239,68,68,0.10); color: #ef4444; }
.grade-pill.grade-F9 { background: rgba(239,68,68,0.15); color: #dc2626; }

/* ══════════════════════════════════════════════════════════════
   LIGHT THEME COMPONENT OVERRIDES
   (Sidebar stays dark navy — premium Notion/Linear aesthetic)
   ══════════════════════════════════════════════════════════════ */

/* Body background */
[data-theme="light"] body {
  background-color: #f0f4f8;
  color: #0f172a;
}

/* Sidebar — stays dark in light mode for contrast */
[data-theme="light"] .sidebar {
  background: #1e293b;
  border-right: 1px solid #2d3b55;
}
[data-theme="light"] .sidebar .app-name  { color: #60a5fa; }
[data-theme="light"] .sidebar .app-sub   { color: #64748b; }
[data-theme="light"] .sidebar .nav-item  { color: #94a3b8; }
[data-theme="light"] .sidebar .nav-item:hover { background: rgba(255,255,255,0.06); color: #e2e8f0; }
[data-theme="light"] .sidebar .nav-item.active { background: rgba(96,165,250,0.12); color: #60a5fa; border-left-color: #60a5fa; }
[data-theme="light"] .sidebar .nav-section-label { color: #334155; }
[data-theme="light"] .sidebar .user-name  { color: #e2e8f0; }
[data-theme="light"] .sidebar .user-role  { color: #64748b; }
[data-theme="light"] .sidebar .logout-btn { border-color: #2d3b55; color: #64748b; }
[data-theme="light"] .sidebar .logout-btn:hover { background: rgba(239,68,68,0.15); border-color: #ef4444; color: #ef4444; }
[data-theme="light"] .sidebar .sidebar-close { color: #64748b; }
[data-theme="light"] .sidebar-logo { border-bottom-color: #2d3b55; }
[data-theme="light"] .sidebar-footer { border-top-color: #2d3b55; }

/* Topbar */
[data-theme="light"] .topbar {
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 4px rgba(15,23,42,0.06);
}
[data-theme="light"] .topbar-title   { color: #0f172a; }
[data-theme="light"] .topbar-subtitle { color: #64748b; }
[data-theme="light"] .menu-toggle    { color: #64748b; }
[data-theme="light"] .date-badge     { background: #f1f5f9; color: #475569; border: 1px solid #e2e8f0; }

/* Cards */
[data-theme="light"] .card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  box-shadow: 0 1px 4px rgba(15,23,42,0.06);
}
[data-theme="light"] .card-header    { background: #f8fafc; border-bottom: 1px solid #e2e8f0; }
[data-theme="light"] .card-title     { color: #0f172a; }

/* Tables */
[data-theme="light"] table thead th  { background: #f8fafc; color: #475569; border-bottom: 2px solid #e2e8f0; }
[data-theme="light"] table td        { border-bottom: 1px solid #f1f5f9; color: #0f172a; }
[data-theme="light"] table tr:hover td { background: #f8fafc; }

/* Form controls */
[data-theme="light"] .form-control {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #0f172a;
}
[data-theme="light"] .form-control:focus { border-color: #3b6cf6; background: #fff; }
[data-theme="light"] .form-label   { color: #374151; }
[data-theme="light"] .form-hint    { color: #94a3b8; }

/* Buttons */
[data-theme="light"] .btn-secondary {
  background: #f1f5f9;
  border-color: #e2e8f0;
  color: #334155;
}
[data-theme="light"] .btn-secondary:hover { background: #e2e8f0; color: #1e293b; }

/* Badges */
[data-theme="light"] .badge-core    { background: rgba(59,130,246,0.12); color: #1d4ed8; }
[data-theme="light"] .badge-active  { background: rgba(22,163,74,0.12);  color: #15803d; }
[data-theme="light"] .badge-inactive{ background: rgba(100,116,139,0.12); color: #475569; }
[data-theme="light"] .badge-noncore { background: #f1f5f9; color: #64748b; border: 1px solid #e2e8f0; }

/* Page header */
[data-theme="light"] .page-header   { border-bottom: 1px solid #e2e8f0; }
[data-theme="light"] .page-title    { color: #0f172a; }
[data-theme="light"] .breadcrumb    { color: #64748b; }

/* Stats / metric cards */
[data-theme="light"] .stat-card     { background: #ffffff; border: 1px solid #e2e8f0; }
[data-theme="light"] .stat-value    { color: #0f172a; }
[data-theme="light"] .stat-label    { color: #64748b; }

/* Alerts */
[data-theme="light"] .alert-success { background: rgba(22,163,74,0.08);  border-color: #16a34a; color: #15803d; }
[data-theme="light"] .alert-error   { background: rgba(220,38,38,0.08);   border-color: #dc2626; color: #b91c1c; }
[data-theme="light"] .alert-info    { background: rgba(2,132,199,0.08);   border-color: #0284c7; color: #0369a1; }
[data-theme="light"] .alert-warning { background: rgba(217,119,6,0.08);   border-color: #d97706; color: #b45309; }

/* Empty state */
[data-theme="light"] .empty-state   { color: #94a3b8; }

/* Sidebar overlay on mobile */
[data-theme="light"] .sidebar-overlay { background: rgba(15,23,42,0.45); }

/* Mark entry cards */
[data-theme="light"] .mark-card     { background: #ffffff; border-color: #e2e8f0; }
[data-theme="light"] .student-block { background: #ffffff; border-color: #e2e8f0; }
[data-theme="light"] .student-block-head:hover { background: #f8fafc; }
[data-theme="light"] .student-block.open .student-block-head { border-bottom-color: #e2e8f0; }
[data-theme="light"] .subject-row   { border-bottom-color: #f1f5f9; }

/* ── Theme toggle button ──────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 17px;
  transition: all 0.2s ease;
  flex-shrink: 0;
  user-select: none;
}
.theme-toggle:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.08);
}
[data-theme="light"] .theme-toggle {
  background: #f1f5f9;
  border-color: #e2e8f0;
  color: #475569;
}
[data-theme="light"] .theme-toggle:hover {
  background: rgba(59,108,246,0.10);
  border-color: #3b6cf6;
  color: #3b6cf6;
}