/* =====================================================================
   English Badi - public site stylesheet
   Mobile-first, plain CSS, no build step. Organised into sections:
   1. Fonts & variables   2. Reset & base   3. Layout & utilities
   4. Header & nav        5. Footer         6. Buttons & forms
   7. Homepage tiles      8. Chips          9. Lessons
   10. Links              11. Posters + lightbox   12. Quizzes
   13. Learner dashboard  14. Misc pages    15. Responsive breakpoints
   ===================================================================== */

/* ---------------------------------------------------------------------
   1. Fonts & variables
   --------------------------------------------------------------------- */
@font-face {
  font-family: 'Noto Sans Telugu';
  src: url('../fonts/NotoSansTelugu-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0951-0952, U+0964-0965, U+0C00-0C7F, U+1CDA, U+1CF2, U+200C-200D, U+25CC;
}
@font-face {
  font-family: 'Noto Sans Telugu';
  src: url('../fonts/NotoSansTelugu-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0951-0952, U+0964-0965, U+0C00-0C7F, U+1CDA, U+1CF2, U+200C-200D, U+25CC;
}

:root {
  --color-blue: #4A5FBF;
  --color-blue-dark: #3B4C9C;
  --color-blue-tint-1: #EEF0FB;
  --color-blue-tint-2: #DCE0F5;
  --color-green: #3FAE4B;
  --color-green-dark: #33903D;
  --color-green-tint-1: #EAF7EC;
  --color-green-tint-2: #D3EFD8;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F8FA;
  --color-ink: #1F2328;
  --color-ink-light: #565D66;
  --color-border: #E3E6EA;
  --color-danger: #C0392B;
  --color-danger-tint: #FBEAE8;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.10);
  --header-height: 60px;
  --container-width: 1100px;
  --font-english: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-telugu: 'Noto Sans Telugu', 'Noto Sans', sans-serif;
}

/* ---------------------------------------------------------------------
   2. Reset & base
   --------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-english);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
}
[lang="te"], .te { font-family: var(--font-telugu); line-height: 1.8; }
img { max-width: 100%; display: block; }
picture { display: block; }
a { color: var(--color-blue); }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 0.5em; color: var(--color-ink); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
button { font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: 1rem; }
svg { display: block; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--color-blue);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------
   3. Layout & utilities
   --------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding-top: 32px; padding-bottom: 32px; }
.section--tight { padding-top: 20px; padding-bottom: 20px; }
.text-center { text-align: center; }
.muted { color: var(--color-ink-light); }

.flash {
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 16px 0;
  font-weight: 600;
}
.flash--success { background: var(--color-green-tint-1); color: var(--color-green-dark); }
.flash--error   { background: var(--color-danger-tint); color: var(--color-danger); }
.flash--info    { background: var(--color-blue-tint-1); color: var(--color-blue-dark); }

.page-title { font-size: 1.6rem; margin-bottom: 0.3em; }
.page-subtitle { color: var(--color-ink-light); margin-bottom: 1.5em; }

.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 28px 0;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.pager__link { font-weight: 600; text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.pager__current { color: var(--color-ink-light); font-size: 0.9rem; }

/* ---------------------------------------------------------------------
   4. Header & nav
   --------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}
.site-header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 800;
  font-size: 1.05rem;
  min-height: 44px;
}
.site-logo__mark { width: 32px; height: 32px; flex-shrink: 0; }
.site-header__actions { display: flex; align-items: center; gap: 6px; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--color-ink);
  cursor: pointer;
  text-decoration: none;
}
.icon-btn:hover { background: var(--color-bg-alt); }
.icon-btn svg { width: 22px; height: 22px; }

.auth-btn {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-blue);
  border: 1.5px solid var(--color-blue);
  white-space: nowrap;
}
.auth-btn--primary { background: var(--color-blue); color: #fff; }
.auth-btn--user { border-color: var(--color-green); color: var(--color-green-dark); }

/* Login lives once in the markup, inside .site-nav. Below the header's
   desktop breakpoint it renders as the first row of the mobile drawer
   (this styling); at/above that breakpoint it is repositioned via
   `order` to sit next to Register instead - see section 15.
   Selector is deliberately as specific as ".site-nav a" (class+type
   twice over) so these overrides reliably win without needing
   !important - a plain ".site-nav__login" class alone is LESS specific
   than ".site-nav a" and silently loses the cascade to it. */
.site-nav a.site-nav__login {
  font-weight: 800;
  color: var(--color-blue);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 6px;
  padding-bottom: 12px;
}

.hamburger {
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-ink);
}
.hamburger svg { width: 26px; height: 26px; }

.site-nav {
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: var(--color-bg);
  padding: 16px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.site-nav.is-open { transform: translateX(0); }
.site-nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 8px;
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 600;
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
}
.site-nav a.is-active { color: var(--color-blue); background: var(--color-blue-tint-1); }
.site-nav a:hover { background: var(--color-bg-alt); }

.site-search {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 4px 4px 12px;
  margin: 4px 0 12px;
  order: -1;
}
.site-search input[type="search"] {
  flex: 1;
  min-width: 0; /* form controls default to a non-zero intrinsic min-width
                   in a flex row, which silently overflows a constrained
                   parent (e.g. the 180px desktop search box) otherwise */
  border: none;
  outline: none;
  min-height: 40px;
  font-size: 1rem;
  background: transparent;
}
.site-search button {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--color-blue);
  color: #fff;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}
.site-search button svg { width: 18px; height: 18px; }

/* ---------------------------------------------------------------------
   5. Footer
   --------------------------------------------------------------------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 32px 0 24px;
  margin-top: 48px;
}
.site-footer__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 16px;
  text-align: center;
}
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin-bottom: 16px;
}
.site-footer__links a {
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 600;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.site-footer__links a:hover { color: var(--color-blue); }
.site-footer__social {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}
.site-footer__social a {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
}
.site-footer__social svg { width: 20px; height: 20px; }
.site-footer__copyright { color: var(--color-ink-light); font-size: 0.85rem; margin: 0; }

/* ---------------------------------------------------------------------
   6. Buttons & forms
   --------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  background: var(--color-bg-alt);
  color: var(--color-ink);
}
.btn--primary { background: var(--color-blue); color: #fff; }
.btn--primary:hover { background: var(--color-blue-dark); }
.btn--accent { background: var(--color-green); color: #fff; }
.btn--accent:hover { background: var(--color-green-dark); }
.btn--outline { background: transparent; border-color: var(--color-blue); color: var(--color-blue); }
.btn--outline:hover { background: var(--color-blue-tint-1); }
.btn--danger { background: transparent; border-color: var(--color-danger); color: var(--color-danger); }
.btn--sm { min-height: 38px; padding: 0 14px; font-size: 0.9rem; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

.form-field { margin-bottom: 18px; }
.form-field label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.95rem;
}
.form-field input[type="text"],
.form-field input[type="email"],
.form-field input[type="password"],
.form-field input[type="search"],
.form-field input[type="url"],
.form-field textarea,
.form-field select {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-ink);
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  border-color: var(--color-blue);
  outline: none;
}
.form-hint { font-size: 0.85rem; color: var(--color-ink-light); margin-top: 4px; }
.form-error { font-size: 0.85rem; color: var(--color-danger); margin-top: 4px; }
.form-honeypot { position: absolute; left: -9999px; top: -9999px; }
.form-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.form-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  max-width: 460px;
  margin: 0 auto;
}

/* ---------------------------------------------------------------------
   7. Homepage
   --------------------------------------------------------------------- */
.home-hero {
  display: flex;
  flex-direction: column;
  min-height: calc(100svh - var(--header-height));
}
@supports not (height: 100svh) {
  .home-hero { min-height: calc(100vh - var(--header-height)); }
}
.home-tiles {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 10px;
  padding: 10px;
  min-height: 320px;
}
.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: var(--radius-lg);
  padding: 14px 10px;
  text-decoration: none;
  color: var(--color-ink);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.tile:hover, .tile:focus-visible { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.tile__icon { width: 36px; height: 36px; margin-bottom: 8px; }
.tile__label { font-size: 1.05rem; font-weight: 800; }
.tile__subtitle { font-size: 0.78rem; color: var(--color-ink-light); margin-top: 4px; }
.tile--lessons { background: var(--color-blue-tint-1); }
.tile--lessons .tile__icon { color: var(--color-blue); }
.tile--quizzes { background: var(--color-blue-tint-2); }
.tile--quizzes .tile__icon { color: var(--color-blue-dark); }
.tile--links { background: var(--color-green-tint-1); }
.tile--links .tile__icon { color: var(--color-green); }
.tile--posters { background: var(--color-green-tint-2); }
.tile--posters .tile__icon { color: var(--color-green-dark); }

.home-intro {
  max-width: 640px;
  margin: 0 auto;
  padding: 28px 16px 8px;
  text-align: center;
}
.home-intro p { color: var(--color-ink-light); font-size: 1.02rem; }
.home-intro .btn { margin-top: 8px; }

.latest-strip { padding: 24px 0 40px; }
.latest-strip h2 { text-align: center; margin-bottom: 18px; }
.latest-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.latest-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: var(--color-ink);
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}
.latest-card__thumb {
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
  overflow: hidden;
  position: relative;
}
.latest-card__thumb img { width: 100%; height: 100%; object-fit: cover; }
.latest-card__type {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(255,255,255,0.92);
  color: var(--color-blue-dark);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 8px;
  border-radius: 20px;
}
.latest-card__body { padding: 10px 12px 14px; flex: 1; }
.latest-card__title { font-size: 0.95rem; font-weight: 700; margin: 0 0 4px; line-height: 1.35; }
.latest-card__meta { font-size: 0.78rem; color: var(--color-ink-light); }

/* ---------------------------------------------------------------------
   8. Category chips
   --------------------------------------------------------------------- */
.chip-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 14px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.chip {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-ink);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
}
.chip.is-active { background: var(--color-blue); border-color: var(--color-blue); color: #fff; }
.chip:hover:not(.is-active) { border-color: var(--color-blue); }

/* ---------------------------------------------------------------------
   9. Lessons
   --------------------------------------------------------------------- */
.lesson-list { display: flex; flex-direction: column; gap: 4px; }
.lesson-list__item {
  display: flex;
  gap: 12px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-ink);
}
.lesson-list__thumb {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-blue-tint-1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-blue);
}
.lesson-list__thumb img { width: 100%; height: 100%; object-fit: cover; }
.lesson-list__thumb svg { width: 30px; height: 30px; }
.lesson-list__body { flex: 1; min-width: 0; }
.lesson-list__title { font-size: 1rem; font-weight: 700; margin: 0 0 4px; }
.lesson-list__excerpt {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  margin: 0 0 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.lesson-list__meta { font-size: 0.75rem; color: var(--color-ink-light); }
.lesson-list__readmore { font-size: 0.82rem; font-weight: 700; color: var(--color-blue); }

.lesson-single__meta { color: var(--color-ink-light); font-size: 0.88rem; margin-bottom: 18px; }
.lesson-single__featured {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
  background: var(--color-bg-alt);
}
.lesson-single__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}
.lesson-single__nav a {
  text-decoration: none;
  color: var(--color-ink);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: block;
}
.lesson-single__nav a:hover { border-color: var(--color-blue); }
.lesson-single__nav .dir { font-size: 0.72rem; text-transform: uppercase; color: var(--color-ink-light); font-weight: 700; }
.lesson-single__nav .title { font-weight: 700; margin-top: 2px; }
.lesson-single__nav--next { text-align: right; grid-column: 2; }

/* Rich text renderer - used on single lesson pages, pages (About/Contact/
   etc.), and the admin editor's Preview toggle. Must stay identical
   everywhere so what the teacher sees in preview matches the live site. */
.content-body { font-size: 1.02rem; }
.content-body h2 { font-size: 1.35rem; margin-top: 1.4em; color: var(--color-blue-dark); }
.content-body h3 { font-size: 1.15rem; margin-top: 1.2em; }
.content-body p { margin: 0 0 1em; }
.content-body ul, .content-body ol { margin: 0 0 1em; padding-left: 1.4em; }
.content-body li { margin-bottom: 0.4em; }
.content-body blockquote {
  margin: 1.2em 0;
  padding: 10px 18px;
  border-left: 4px solid var(--color-green);
  background: var(--color-green-tint-1);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-ink);
}
.content-body a { color: var(--color-blue); text-decoration: underline; }
.content-body img { border-radius: var(--radius-sm); margin: 1em 0; }
.content-body strong { font-weight: 700; }
.content-body [lang="te"] { line-height: 1.8; }

/* ---------------------------------------------------------------------
   10. Links
   --------------------------------------------------------------------- */
.link-list { display: flex; flex-direction: column; gap: 14px; }
.link-card {
  display: flex;
  gap: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px;
  align-items: flex-start;
}
.link-card__thumb {
  width: 110px;
  height: 82px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  background: var(--color-blue-tint-1);
  cursor: pointer;
}
.link-card__thumb img { width: 100%; height: 100%; object-fit: cover; }
.link-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.15);
}
.link-card__play svg { width: 34px; height: 34px; color: #fff; filter: drop-shadow(0 1px 3px rgba(0,0,0,.5)); }
.link-card__letter {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; font-weight: 800; color: var(--color-blue);
  background: var(--color-blue-tint-1);
  text-decoration: none;
}
.link-card__body { flex: 1; min-width: 0; }
.link-card__title { font-size: 1rem; font-weight: 700; margin: 0 0 4px; }
.link-card__desc { font-size: 0.88rem; color: var(--color-ink-light); margin: 0 0 8px; }
.link-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-green-dark);
  text-decoration: none;
  min-height: 32px;
}
.link-card__cta svg { width: 16px; height: 16px; }
.link-card__category {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-green-dark);
  margin-bottom: 4px;
}
.link-embed-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: 10px;
}
.link-embed-wrap iframe { width: 100%; height: 100%; border: 0; }

/* ---------------------------------------------------------------------
   11. Posters + lightbox
   --------------------------------------------------------------------- */
.poster-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.poster-grid__item {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-bg-alt);
  border: none;
  padding: 0;
  cursor: pointer;
  display: block;
}
.poster-grid__item img { width: 100%; height: 100%; object-fit: cover; }
.poster-grid__caption {
  position: absolute;
  inset: auto 0 0 0;
  background: linear-gradient(to top, rgba(0,0,0,0.72), transparent);
  color: #fff;
  font-size: 0.78rem;
  padding: 18px 8px 6px;
  opacity: 0;
  transition: opacity 0.15s ease;
  text-align: left;
}
@media (hover: hover) {
  .poster-grid__item:hover .poster-grid__caption,
  .poster-grid__item:focus-visible .poster-grid__caption { opacity: 1; }
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 16, 0.94);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.lightbox[hidden] { display: none; }
.lightbox__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.12);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox__stage {
  flex: 1;
  width: 100%;
  max-width: 720px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 0;
}
.lightbox__image { max-width: 100%; max-height: 70vh; border-radius: var(--radius-sm); object-fit: contain; }
.lightbox__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.12);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox__arrow--prev { left: 0; }
.lightbox__arrow--next { right: 0; }
.lightbox__caption { color: #fff; text-align: center; max-width: 640px; margin: 14px auto 0; font-size: 0.95rem; }
.lightbox__actions { display: flex; gap: 12px; margin-top: 16px; }
.lightbox__actions .btn { min-height: 44px; }
.lightbox__counter { color: rgba(255,255,255,0.7); font-size: 0.8rem; margin-top: 8px; }

/* ---------------------------------------------------------------------
   12. Quizzes
   --------------------------------------------------------------------- */
.quiz-card-grid { display: flex; flex-direction: column; gap: 14px; }
.quiz-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
  text-decoration: none;
  color: var(--color-ink);
  display: block;
}
.quiz-card:hover { border-color: var(--color-blue); }
.quiz-card__title { font-size: 1.1rem; font-weight: 800; margin: 0 0 4px; }
.quiz-card__meta { font-size: 0.85rem; color: var(--color-ink-light); margin-bottom: 8px; }
.quiz-card__best {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-green-dark);
  background: var(--color-green-tint-1);
  padding: 3px 10px;
  border-radius: 999px;
}

.quiz-shell { max-width: 640px; margin: 0 auto; }
.quiz-progress-track {
  height: 8px;
  background: var(--color-bg-alt);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 8px;
}
.quiz-progress-fill { height: 100%; background: var(--color-blue); transition: width 0.2s ease; }
.quiz-progress-label { font-size: 0.85rem; color: var(--color-ink-light); margin-bottom: 20px; }

.quiz-question-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.quiz-question-text { font-size: 1.15rem; font-weight: 700; margin-bottom: 18px; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  background: var(--color-bg);
  text-align: left;
  width: 100%;
  font-size: 1rem;
  color: var(--color-ink);
}
.quiz-option input { width: 18px; height: 18px; flex-shrink: 0; }
.quiz-option:hover { border-color: var(--color-blue); }
.quiz-option.is-selected { border-color: var(--color-blue); background: var(--color-blue-tint-1); }
.quiz-option.is-correct { border-color: var(--color-green); background: var(--color-green-tint-1); }
.quiz-option.is-incorrect { border-color: var(--color-danger); background: var(--color-danger-tint); }
.quiz-option[disabled], .quiz-option.is-locked { cursor: default; }

.quiz-text-answer input {
  width: 100%;
  min-height: 52px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  font-size: 1.1rem;
  margin-bottom: 18px;
}
.quiz-text-answer input.is-correct { border-color: var(--color-green); background: var(--color-green-tint-1); }
.quiz-text-answer input.is-incorrect { border-color: var(--color-danger); background: var(--color-danger-tint); }

.quiz-feedback {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}
.quiz-feedback--correct { background: var(--color-green-tint-1); color: var(--color-green-dark); }
.quiz-feedback--incorrect { background: var(--color-danger-tint); color: var(--color-danger); }
.quiz-feedback strong { display: block; margin-bottom: 4px; }
.quiz-actions { display: flex; justify-content: flex-end; gap: 12px; }

.quiz-end { text-align: center; }
.quiz-end__score { font-size: 2.6rem; font-weight: 800; color: var(--color-blue); margin: 8px 0 0; }
.quiz-end__percent { color: var(--color-ink-light); margin-bottom: 8px; }
.quiz-end__compare {
  display: inline-block;
  background: var(--color-green-tint-1);
  color: var(--color-green-dark);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-weight: 600;
  margin: 12px 0 20px;
}
.quiz-review { text-align: left; margin: 24px 0; display: flex; flex-direction: column; gap: 10px; }
.quiz-review__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.quiz-review__item.is-wrong { border-left: 4px solid var(--color-danger); }
.quiz-review__item.is-right { border-left: 4px solid var(--color-green); }
.quiz-review__q { font-weight: 700; margin-bottom: 6px; }
.quiz-review__a { font-size: 0.9rem; margin: 2px 0; }
.quiz-review__explain { font-size: 0.85rem; color: var(--color-ink-light); margin-top: 6px; }

.quiz-register-nudge {
  position: relative;
  background: var(--color-blue-tint-1);
  border-radius: var(--radius-md);
  padding: 18px 40px 18px 18px;
  margin: 20px 0;
  text-align: left;
}
.quiz-register-nudge__close {
  position: absolute;
  top: 8px; right: 8px;
  width: 32px; height: 32px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--color-ink-light);
  font-size: 1.2rem;
  line-height: 1;
}
.quiz-register-nudge p { margin: 0 0 10px; font-weight: 600; }

/* ---------------------------------------------------------------------
   13. Learner dashboard
   --------------------------------------------------------------------- */
.dash-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 28px; }
.dash-stat { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 16px; text-align: center; }
.dash-stat__value { font-size: 1.8rem; font-weight: 800; color: var(--color-blue); }
.dash-stat__label { font-size: 0.82rem; color: var(--color-ink-light); }
.dash-quiz-block { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 16px; margin-bottom: 16px; }
.dash-quiz-block h3 { margin-bottom: 4px; }
.dash-encourage { color: var(--color-green-dark); font-weight: 600; font-size: 0.9rem; margin: 4px 0 12px; }
.dash-chart { width: 100%; height: 90px; margin: 10px 0; }
.dash-attempts { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.dash-attempts th, .dash-attempts td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--color-border); }

/* ---------------------------------------------------------------------
   14. Misc pages (404, search, contact)
   --------------------------------------------------------------------- */
.error-page { text-align: center; padding: 60px 16px; }
.error-page__code { font-size: 4rem; font-weight: 800; color: var(--color-blue-tint-2); margin: 0; }
.error-page__links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 24px; }

.search-results-group { margin-bottom: 28px; }
.search-results-group h2 { font-size: 1.1rem; color: var(--color-green-dark); border-bottom: 2px solid var(--color-green-tint-1); padding-bottom: 6px; }
.search-result-item { padding: 10px 0; border-bottom: 1px solid var(--color-border); }
.search-result-item a { font-weight: 700; text-decoration: none; }
.search-result-item p { margin: 4px 0 0; color: var(--color-ink-light); font-size: 0.9rem; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
}
.badge--draft { background: var(--color-danger-tint); color: var(--color-danger); }
.badge--published { background: var(--color-green-tint-1); color: var(--color-green-dark); }

/* ---------------------------------------------------------------------
   15. Responsive breakpoints
   --------------------------------------------------------------------- */
@media (min-width: 600px) {
  .container { padding: 0 24px; }
  .site-header__inner { padding: 0 24px; }
  .latest-grid { grid-template-columns: repeat(3, 1fr); }
  .poster-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .dash-stats { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 860px) {
  .home-tiles { grid-template-columns: repeat(4, 1fr); grid-template-rows: 1fr; max-width: var(--container-width); margin: 0 auto; width: 100%; }
  .tile__icon { width: 44px; height: 44px; }
  .tile__label { font-size: 1.15rem; }

  .latest-grid { grid-template-columns: repeat(6, 1fr); }
  .poster-grid { grid-template-columns: repeat(3, 1fr); }

  .lesson-list__item { padding: 18px 8px; }
  .lesson-list__thumb { width: 96px; height: 96px; }

  .quiz-question-text { font-size: 1.3rem; }
}

/* ---- Desktop header --------------------------------------------------
   A separate, higher breakpoint from the rest of the page: the navbar
   has more items packed into it (logo, 8 links, search, login, register)
   than a 4-column tile grid does, so it needs more room before it can
   safely leave the hamburger/drawer pattern. Below this width the header
   is untouched mobile behaviour (see section 4 base rules + is-open).
   One flex row: logo | nav links (centre, growing) | search + login +
   register (right). No absolute positioning, no negative margins -
   ordering is done with flexbox `order` only. */
@media (min-width: 1200px) {
  .site-header__inner { max-width: 1440px; }

  .hamburger { display: none; }

  .site-nav {
    position: static;
    transform: none;
    flex-direction: row;
    align-items: center;
    padding: 0;
    inset: auto;
    overflow: visible;
    gap: 4px;
    flex: 1 1 0%;
    min-width: 0;
    margin: 0 20px;
  }
  .site-nav a {
    min-height: 40px;
    padding: 0 10px;
    font-size: 0.92rem;
    white-space: nowrap;
  }

  /* Search and Login sort after the nav links (which keep their default
     order: 0) so they land at the nav's right edge, right next to
     Register - reading as one "search + auth" group on the right even
     though Register itself lives in the sibling .site-header__actions. */
  .site-search {
    order: 10;
    margin: 0;
    width: 180px;
    flex: 0 0 auto;
  }
  .site-search input[type="search"] { min-height: 34px; }
  .site-search button { width: 34px; height: 34px; }

  .site-nav a.site-nav__login {
    order: 11;
    flex: 0 0 auto;
    min-height: 40px;
    padding: 0 14px;
    margin-bottom: 0;
    border: 1.5px solid var(--color-blue);
    border-radius: var(--radius-sm);
    white-space: nowrap;
  }
}

@media (min-width: 1024px) {
  .home-tiles { min-height: 420px; }
}