/* =========================================================
   NABD (نَبْض) — Brand Theme
   Modern Egyptian EdTech. RTL-first. Cairo typeface.
   ========================================================= */

:root {
  /* Nabd green: the colour of the app icon, so the student platform owns its own identity. */
  --nabd-primary: #116E63;
  --nabd-primary-rgb: 17, 110, 99;
  --nabd-primary-600: #0C5049;
  --nabd-primary-400: #1A8F81;
  --nabd-secondary: #0D9488;
  --nabd-secondary-rgb: 13, 148, 136;
  --nabd-secondary-600: #0F766E;
  --nabd-secondary-300: #5EEAD4;
  --nabd-accent: #F59E0B;
  --nabd-accent-rgb: 245, 158, 11;
  --nabd-accent-600: #D97706;
  --nabd-success: #16A34A;
  --nabd-bg: #F6F8FB;
  --nabd-surface: #FFFFFF;
  --nabd-surface-2: #EEF2F7;
  --nabd-text: #0F172A;
  --nabd-muted: #64748B;
  --nabd-line: #E2E8F0;
  --nabd-error: #DC2626;

  --nabd-radius-sm: 0.625rem;
  --nabd-radius: 1rem;
  --nabd-radius-lg: 1.5rem;
  --nabd-radius-xl: 2rem;
  --nabd-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.07);
  --nabd-shadow: 0 8px 24px -12px rgba(15, 23, 42, 0.18), 0 2px 6px rgba(15, 23, 42, 0.05);
  --nabd-shadow-lg: 0 24px 48px -24px rgba(15, 23, 42, 0.32), 0 8px 16px -12px rgba(15, 23, 42, 0.12);
  --nabd-ring: 0 0 0 4px rgba(var(--nabd-secondary-rgb), 0.18);

  --nabd-gradient-deep: linear-gradient(135deg, #072E29 0%, #116E63 55%, #1A8F81 100%);
  --nabd-gradient-teal: linear-gradient(135deg, #0D9488 0%, #14B8A6 100%);
  --nabd-gradient-amber: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);

  --nabd-font: "Tajawal", "Cairo", "Segoe UI", Tahoma, sans-serif;
  --nabd-font-display: "Almarai", "Tajawal", "Cairo", "Segoe UI", Tahoma, sans-serif;
}

/* ---------- Base ---------- */

html, body {
  background-color: var(--nabd-bg);
  color: var(--nabd-text);
  font-family: var(--nabd-font);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--nabd-font-display);
  font-weight: 800;
  color: var(--nabd-primary);
  letter-spacing: -0.01em;
}

a {
  color: var(--nabd-secondary);
  text-decoration: none;
}
a:hover {
  color: var(--nabd-primary);
}

::selection {
  background: rgba(var(--nabd-accent-rgb), 0.35);
}

/* ---------- Brand mark ---------- */

.nabd-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--nabd-primary) !important;
}
.nabd-brand .nabd-mark {
  width: 30px;
  height: 30px;
  flex: none;
}
.nabd-tagline {
  color: var(--nabd-muted);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ---------- Navbar ---------- */

.nabd-navbar {
  background-color: var(--nabd-surface) !important;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: var(--nabd-shadow-sm);
}
.nabd-navbar .nav-link {
  color: var(--nabd-text) !important;
  font-weight: 600;
}
.nabd-navbar .nav-link:hover {
  color: var(--nabd-secondary) !important;
}

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

.btn {
  border-radius: var(--nabd-radius-sm);
  font-weight: 700;
  padding-inline: 1.1rem;
}

/* Comfortable tap targets on touch screens — Bootstrap's .btn-sm (~27px) is too
   small to tap reliably; bump it up on narrow/mobile viewports specifically. */
@media (max-width: 767.98px) {
  .btn-sm {
    min-height: 40px;
    padding-block: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .navbar-toggler {
    min-height: 40px;
    min-width: 40px;
  }
}

.btn-primary {
  background-color: var(--nabd-primary);
  border-color: var(--nabd-primary);
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
  background-color: #0f1b3d !important;
  border-color: #0f1b3d !important;
}

.btn-accent {
  background-color: var(--nabd-accent);
  border-color: var(--nabd-accent);
  color: #1a1204;
}
.btn-accent:hover {
  background-color: #d98a08;
  border-color: #d98a08;
  color: #1a1204;
}

.btn-outline-primary {
  color: var(--nabd-primary);
  border-color: var(--nabd-primary);
}
.btn-outline-primary:hover {
  background-color: var(--nabd-primary);
  border-color: var(--nabd-primary);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.2rem rgba(var(--nabd-secondary-rgb), 0.25);
}

.btn-link {
  color: var(--nabd-secondary);
}

/* ---------- Forms ---------- */

.form-control, .form-select {
  border-radius: var(--nabd-radius-sm);
  border-color: rgba(15, 23, 42, 0.15);
}
.form-control:focus, .form-select:focus {
  border-color: var(--nabd-secondary);
}
label, .form-label {
  font-weight: 700;
  color: var(--nabd-text);
}
.text-danger {
  color: var(--nabd-error) !important;
}

/* ---------- Cards ---------- */

.card {
  border: none;
  border-radius: var(--nabd-radius);
  box-shadow: var(--nabd-shadow-sm);
  background-color: var(--nabd-surface);
}
.card:hover {
  box-shadow: var(--nabd-shadow);
}

.nabd-card {
  border-radius: var(--nabd-radius);
  box-shadow: var(--nabd-shadow-sm);
  border: 1px solid var(--nabd-line);
  background-color: var(--nabd-surface);
  padding: 2rem;
}

.nabd-auth-card {
  max-width: 420px;
  margin: 3rem auto;
}

/* ---------- Student stat tiles (gamified dashboard) ---------- */

.nabd-stat-tile {
  border-radius: var(--nabd-radius);
  box-shadow: var(--nabd-shadow);
  background-color: var(--nabd-surface);
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.nabd-stat-tile:hover {
  transform: translateY(-4px);
  box-shadow: var(--nabd-shadow-lg);
}
.nabd-stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}
.nabd-stat-icon.icon-level { background-color: rgba(23, 37, 84, 0.1); }
.nabd-stat-icon.icon-streak { background-color: rgba(var(--nabd-accent-rgb), 0.15); }
.nabd-stat-icon.icon-lessons { background-color: rgba(var(--nabd-secondary-rgb), 0.12); }
.nabd-stat-value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.1;
}
.nabd-stat-label {
  color: var(--nabd-muted);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.nabd-stat-sub {
  color: var(--nabd-muted);
  font-size: 0.8rem;
  margin-top: 0.35rem;
}

/* Level progress: how close to the next level */
.nabd-level-track {
  height: 10px;
  border-radius: 999px;
  background-color: rgba(23, 37, 84, 0.08);
  overflow: hidden;
  margin-top: 0.5rem;
}
.nabd-level-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--nabd-secondary), var(--nabd-accent));
  transition: width 0.4s ease;
}

/* ---------- Unit / lesson cards (Student browsing) ---------- */

.nabd-unit-card {
  border-radius: var(--nabd-radius);
  box-shadow: var(--nabd-shadow-sm);
  border: 1px solid var(--nabd-line);
  background-color: var(--nabd-surface);
  padding: 1.5rem;
  height: 100%;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  display: flex;
  flex-direction: column;
}
.nabd-unit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--nabd-shadow-lg);
  border-color: rgba(var(--nabd-secondary-rgb), 0.35);
}
.nabd-unit-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(var(--nabd-accent-rgb), 0.15);
  color: #92600a;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.nabd-lesson-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.25rem;
  border-radius: var(--nabd-radius-sm);
  background-color: var(--nabd-surface);
  box-shadow: var(--nabd-shadow-sm);
  margin-bottom: 0.6rem;
  text-decoration: none;
  color: var(--nabd-text);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.nabd-lesson-row:hover {
  transform: translateX(-3px);
  box-shadow: var(--nabd-shadow);
  color: var(--nabd-text);
}
.nabd-lesson-status {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
}
.nabd-lesson-status.status-completed { background-color: rgba(var(--nabd-secondary-rgb), 0.15); color: var(--nabd-secondary); }
.nabd-lesson-status.status-inprogress { background-color: rgba(var(--nabd-accent-rgb), 0.18); color: #92600a; }
.nabd-lesson-status.status-notstarted { background-color: rgba(15, 23, 42, 0.06); color: var(--nabd-muted); }
.nabd-lesson-title { font-weight: 700; flex: 1; }

.nabd-lesson-nav-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-radius: var(--nabd-radius);
  box-shadow: var(--nabd-shadow-sm);
  padding: 1rem 1.25rem;
  text-decoration: none;
  color: var(--nabd-text);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  border: 1px solid transparent;
}
.nabd-lesson-nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--nabd-shadow);
  color: var(--nabd-text);
}
.nabd-lesson-nav-btn .nabd-nav-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 800;
}
.nabd-lesson-nav-btn.nav-prev {
  background-color: rgba(var(--nabd-secondary-rgb), 0.06);
  border-color: rgba(var(--nabd-secondary-rgb), 0.18);
}
.nabd-lesson-nav-btn.nav-prev .nabd-nav-arrow {
  background-color: rgba(var(--nabd-secondary-rgb), 0.15);
  color: var(--nabd-secondary);
}
.nabd-lesson-nav-btn.nav-prev .nabd-nav-label { color: var(--nabd-secondary); }

.nabd-lesson-nav-btn.nav-next {
  background: linear-gradient(135deg, rgba(var(--nabd-accent-rgb), 0.1), rgba(var(--nabd-accent-rgb), 0.03));
  border-color: rgba(var(--nabd-accent-rgb), 0.25);
  text-align: end;
}
.nabd-lesson-nav-btn.nav-next .nabd-nav-arrow {
  background-color: rgba(var(--nabd-accent-rgb), 0.2);
  color: #92600a;
}
.nabd-lesson-nav-btn.nav-next .nabd-nav-label { color: #92600a; }
.nabd-lesson-nav-btn.nav-next { flex-direction: row-reverse; }

.nabd-nav-label {
  font-size: 0.78rem;
  font-weight: 800;
  margin-bottom: 0.15rem;
}

/* ---------- Portal accent bar ---------- */
/* Quiet per-portal differentiation: a thin top accent + a tone flag on the hero card,
   without giving each portal a fully separate stylesheet. */

.nabd-portal-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--nabd-radius-lg);
  box-shadow: var(--nabd-shadow);
  background: var(--nabd-gradient-deep);
  color: #fff;
  padding: 2.5rem;
  margin-top: 1.5rem;
}

.nabd-portal-hero h1,
.nabd-portal-hero h2,
.nabd-portal-hero h3 {
  color: #fff;
}

/* The hero sets color:#fff for its own text, and everything inside inherits it — including
   a card, which has a white background. Any plain text in such a card came out white on
   white. A card is its own light surface, so it re-asserts its foreground. */
.nabd-portal-hero .nabd-card {
  color: var(--nabd-text);
}

/* The eyebrow is tinted for light cards, so it needs its own treatment on the dark hero.
   Named per portal on purpose: `body .nabd-portal-hero .nabd-eyebrow` ties with
   `body.portal-student .nabd-eyebrow` on specificity and loses on order, which left dark
   amber text sitting on the hero. */
body.portal-student .nabd-portal-hero .nabd-eyebrow,
body.portal-admin .nabd-portal-hero .nabd-eyebrow,
body .nabd-portal-hero .nabd-eyebrow {
  background-color: rgba(255, 255, 255, 0.16);
  color: #fff;
}

/* Direct children only — tiles inside the hero keep their own light surface and dark text. */
.nabd-portal-hero > .text-muted,
.nabd-portal-hero > .small,
.nabd-portal-hero > p {
  color: rgba(255, 255, 255, 0.78) !important;
}

.nabd-portal-hero::after {
  content: "";
  position: absolute;
  width: 18rem;
  height: 18rem;
  border-radius: 50%;
  inset-inline-start: -6rem;
  top: -8rem;
  background: radial-gradient(circle at 40% 40%, rgba(20, 184, 166, 0.55), transparent 70%);
  pointer-events: none;
}

body.portal-student .nabd-portal-hero::after {
  background: radial-gradient(circle at 40% 40%, rgba(245, 158, 11, 0.5), transparent 70%);
}
body.portal-admin .nabd-portal-hero::after {
  background: radial-gradient(circle at 40% 40%, rgba(59, 91, 169, 0.6), transparent 70%);
}

/* Tiles sit on the hero, so they keep their own light surface and lift above it. */
.nabd-portal-hero .nabd-stat-tile {
  position: relative;
  z-index: 1;
}

.nabd-portal-hero > * {
  position: relative;
  z-index: 1;
}

/* The eyebrow is tinted for light cards, so it needs its own treatment on the dark hero. */
body .nabd-portal-hero .nabd-eyebrow {
  background-color: rgba(255, 255, 255, 0.16);
  color: #fff;
}

/* Direct children only — tiles inside the hero keep their own light surface and dark text. */
.nabd-portal-hero > .text-muted,
.nabd-portal-hero > .small,
.nabd-portal-hero > p {
  color: rgba(255, 255, 255, 0.78) !important;
}

.nabd-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}
body.portal-student .nabd-eyebrow {
  background-color: rgba(var(--nabd-accent-rgb), 0.12);
  color: #92600a;
}
body.portal-parent .nabd-eyebrow {
  background-color: rgba(var(--nabd-secondary-rgb), 0.12);
  color: #0b6d63;
}
body.portal-admin .nabd-eyebrow {
  background-color: rgba(var(--nabd-primary-rgb), 0.1);
  color: var(--nabd-primary);
}

/* ---------- Rendered lesson content (Markdown output) ---------- */

.nabd-content {
  font-size: 1.05rem;
  line-height: 1.9;
  color: #1E293B;
}
.nabd-content strong {
  color: var(--nabd-secondary);
  font-weight: 800;
}
body.portal-student .nabd-content strong {
  color: #b45309;
  background-color: rgba(var(--nabd-accent-rgb), 0.14);
  padding: 0.05rem 0.3rem;
  border-radius: 0.3rem;
}
.nabd-content p {
  margin-bottom: 1rem;
}

.nabd-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.nabd-content th, .nabd-content td {
  border: 1px solid rgba(15, 23, 42, 0.12);
  padding: 0.5rem 0.75rem;
  text-align: right;
}
.nabd-content th {
  background-color: rgba(var(--nabd-primary-rgb), 0.06);
  font-weight: 700;
}
.nabd-content blockquote {
  border-inline-start: 4px solid var(--nabd-secondary);
  background-color: rgba(var(--nabd-secondary-rgb), 0.06);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--nabd-radius-sm) var(--nabd-radius-sm) 0;
  margin: 1rem 0;
}
.nabd-content pre {
  background-color: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: var(--nabd-radius-sm);
  overflow-x: auto;
  direction: rtl;
  unicode-bidi: plaintext;
  text-align: start;
}
.nabd-content pre code {
  unicode-bidi: plaintext;
}
.nabd-content code {
  background-color: rgba(15, 23, 42, 0.06);
  padding: 0.1rem 0.4rem;
  border-radius: 0.3rem;
}
.nabd-content pre code {
  background: none;
  padding: 0;
}
.nabd-content details {
  background-color: rgba(var(--nabd-accent-rgb), 0.08);
  border: 1px solid rgba(var(--nabd-accent-rgb), 0.25);
  border-radius: var(--nabd-radius-sm);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
}
.nabd-content details summary {
  cursor: pointer;
  font-weight: 700;
  color: #92600a;
}
.nabd-content p:last-child {
  margin-bottom: 0;
}

/* ---------- Footer ---------- */

.nabd-footer {
  color: var(--nabd-muted);
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

/* ---------- Utility ---------- */

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

/* ---------- .text-bg-* badge backfill ----------
   Bootstrap only ships these combined background+text-color utilities from v5.2 onward;
   this project is pinned to v5.1, so badges using them (text-bg-success, text-bg-danger, etc.)
   rendered with no background at all. Backfilled here using Bootstrap 5.1's own --bs-* vars. */

.text-bg-primary {
  color: #fff !important;
  background-color: var(--bs-primary) !important;
}
.text-bg-secondary {
  color: #fff !important;
  background-color: var(--bs-secondary) !important;
}
.text-bg-success {
  color: #fff !important;
  background-color: var(--bs-success) !important;
}
.text-bg-danger {
  color: #fff !important;
  background-color: var(--bs-danger) !important;
}
.text-bg-warning {
  color: #000 !important;
  background-color: var(--bs-warning) !important;
}
.text-bg-light {
  color: #000 !important;
  background-color: var(--bs-light) !important;
}