/* Baitul Aman Quran Classes. Design tokens and rules follow docs/03-design.md. */

/* ---------- Tokens ---------- */
:root {
  --bg: #FBF8F1;
  --surface: #FFFFFF;
  --surface-alt: #F3EEE2;
  --primary: #0F4C3A;
  --primary-dark: #0A3328;
  --primary-soft: #E3EFE8;
  --gold: #A27726;
  --gold-soft: #F3E6C4;
  --text: #1C2622;
  --text-muted: #55625C;
  --border: #E2DACA;
  --on-primary: #FBF8F1;

  --font-head: 'Cormorant Garamond', 'Tiro Bangla', Georgia, serif;
  --font-body: 'Source Sans 3', 'Hind Siliguri', system-ui, sans-serif;
  --font-arabic: 'Amiri', 'Times New Roman', serif;
  --lh-body: 1.6;
  --lh-head: 1.15;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 24px;
  --shadow: 0 1px 2px rgb(16 40 32 / .06), 0 8px 24px rgb(16 40 32 / .08);

  --max-width: 1120px;
  --gutter: 16px;
  --section-pad: var(--space-8);
  --header-h: 68px;

  --fs-h1: clamp(2.25rem, 1.6rem + 3vw, 3.5rem);
  --fs-h2: clamp(1.75rem, 1.35rem + 1.8vw, 2.5rem);
  --fs-h3: clamp(1.25rem, 1.12rem + .6vw, 1.5rem);
  --fs-body: clamp(1rem, .97rem + .15vw, 1.0625rem);
  --fs-small: .875rem;

  /* 8-point star lattice, drawn as two squares (one turned 45 degrees). */
  --pattern: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48' fill='none' stroke='%230F4C3A' stroke-width='1.2'%3E%3Crect x='15' y='15' width='18' height='18'/%3E%3Crect x='15' y='15' width='18' height='18' transform='rotate(45 24 24)'/%3E%3Cpath d='M24 0v11.3M24 36.7V48M0 24h11.3M36.7 24H48'/%3E%3C/svg%3E");
  --pattern-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48' fill='none' stroke='%23FBF8F1' stroke-width='1.2'%3E%3Crect x='15' y='15' width='18' height='18'/%3E%3Crect x='15' y='15' width='18' height='18' transform='rotate(45 24 24)'/%3E%3Cpath d='M24 0v11.3M24 36.7V48M0 24h11.3M36.7 24H48'/%3E%3C/svg%3E");
}

:lang(bn) {
  --font-head: 'Tiro Bangla', 'Hind Siliguri', serif;
  --font-body: 'Hind Siliguri', 'Source Sans 3', system-ui, sans-serif;
  --lh-body: 1.75;
  --lh-head: 1.35;
}

@media (min-width: 640px) {
  :root { --gutter: 24px; }
}

@media (min-width: 1024px) {
  :root { --gutter: 32px; --section-pad: var(--space-9); }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  overflow-x: clip;
}

h1, h2, h3 {
  margin: 0;
  font-family: var(--font-head);
  line-height: var(--lh-head);
  color: var(--primary);
  font-weight: 700;
  text-wrap: balance;
  font-variant-numeric: lining-nums;
}

:lang(bn) h1, :lang(bn) h2, :lang(bn) h3 { font-weight: 400; }

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { margin: 0; }

a { color: var(--primary); text-underline-offset: 3px; }

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

button { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* Keeps the space for text that waits for videos.json, so nothing jumps when it arrives. */
.is-pending { visibility: hidden; }

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

section[id], .player-card { scroll-margin-top: calc(var(--header-h) + var(--space-4)); }

.container {
  width: 100%;
  max-width: calc(var(--max-width) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.scroll-sentinel { position: absolute; top: 0; left: 0; width: 1px; height: 8px; pointer-events: none; }

.icon {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transform: translateY(-200%);
}

.skip-link:focus { transform: none; }

.noscript {
  margin: var(--space-4);
  padding: var(--space-4);
  background: var(--gold-soft);
  border-radius: var(--radius);
}

/* Low-opacity star pattern behind a section. */
.pattern, .pattern-dark { position: relative; isolation: isolate; }

.pattern::before, .pattern-dark::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: var(--pattern);
  background-size: 48px 48px;
  opacity: .05;
  pointer-events: none;
}

.pattern-dark::before { background-image: var(--pattern-light); }

.eyebrow {
  color: var(--primary);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
}

:lang(bn) .eyebrow { letter-spacing: .02em; font-size: .9375rem; }

.divider {
  width: 120px;
  height: 16px;
  color: var(--gold);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-3);
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: var(--fs-small);
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 18px;
  border: 1.5px solid var(--primary);
  border-radius: 999px;
  background: transparent;
  color: var(--primary);
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, opacity .18s ease, transform .1s ease;
}

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

.btn:active:not(:disabled), .lang-toggle:active, .class-row:active { transform: translateY(1px); }

.btn-primary {
  min-height: 48px;
  padding: 0 var(--space-5);
  background: var(--primary);
  color: var(--on-primary);
}

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

.btn-secondary { background: transparent; }

.btn:disabled {
  opacity: .45;
  cursor: not-allowed;
  background: transparent;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .2s ease;
}

.site-header.is-scrolled { box-shadow: var(--shadow); }

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
  margin-right: auto;
  color: var(--primary);
  text-decoration: none;
}

.brand-star { width: 28px; height: 28px; color: var(--gold); flex: none; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-name {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
}

:lang(bn) .brand-name { font-weight: 400; font-size: 1.125rem; }

.brand-place { color: var(--text-muted); font-size: .8125rem; }

.site-nav { display: none; }

.site-nav ul {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease;
}

.site-nav a:hover { color: var(--primary); background: var(--surface-alt); }

@media (min-width: 640px) {
  .site-nav { display: block; }
}

.lang-toggle {
  min-height: 44px;
  min-width: 88px;
  padding: 0 var(--space-4);
  border: 1.5px solid var(--primary);
  border-radius: 999px;
  background: transparent;
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
  transition: background-color .18s ease;
}

.lang-toggle:hover { background: var(--primary-soft); }

/* ---------- Hero ---------- */
.hero {
  padding-block: var(--space-8) var(--space-8);
  text-align: center;
  overflow: hidden;
}

.hero::after {
  /* Soft fade at the bottom so the pattern does not end in a hard line. */
  content: '';
  position: absolute;
  inset: auto 0 0;
  height: 96px;
  z-index: -1;
  background: linear-gradient(to bottom, rgb(251 248 241 / 0), var(--bg));
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  max-width: 820px;
}

.hero-arch {
  display: none;
  position: absolute;
  left: 50%;
  top: var(--space-4);
  bottom: 0;
  width: 860px; /* wide enough that the hero text always sits inside the arch */
  height: calc(100% - var(--space-4));
  transform: translateX(-50%);
  z-index: -1;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.5;
  opacity: .55;
}

.hero-arch path { vector-effect: non-scaling-stroke; }
.hero-arch path + path { opacity: .5; }

@media (min-width: 1024px) {
  .hero { padding-block: var(--space-8); }
  .hero-arch { display: block; }
}

.bismillah {
  font-family: var(--font-arabic);
  font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.25rem);
  line-height: 1.6;
  color: var(--gold);
}

.hero h1 { max-width: 16ch; }

@media (min-width: 1024px) {
  .hero-inner { max-width: 660px; }
  .bismillah { margin-top: var(--space-6); } /* clear of the arch's pointed top */
  .hero h1 { max-width: none; }
}

.hero-subtitle {
  max-width: 56ch;
  color: var(--text-muted);
  font-size: clamp(1.0625rem, 1rem + .3vw, 1.1875rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2) var(--space-5);
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: var(--fs-small);
  font-weight: 600;
}

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

/* ---------- Sections ---------- */
.section { padding-block: var(--section-pad); }
.section:focus { outline: none; }
.section-alt { background: var(--surface-alt); }

.section-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-7);
  text-align: center;
}

.section-head .divider { margin-bottom: var(--space-2); }

.teacher { color: var(--text-muted); }
#teacher-name { color: var(--text); font-weight: 600; }

/* ---------- Classes: player + list ---------- */
.classes-layout {
  display: grid;
  gap: var(--space-5);
  padding-top: 28px;
}

@media (min-width: 1024px) {
  .classes-layout {
    grid-template-columns: minmax(0, 64fr) minmax(0, 36fr);
    align-items: stretch;
  }
  .classes-layout.is-error { grid-template-columns: minmax(0, 1fr); }
}

.player-col { position: relative; }

/* Thin gold arch that rises behind the top of the player card. */
.player-col::before {
  content: '';
  position: absolute;
  top: -28px;
  left: 6%;
  right: 6%;
  height: 160px;
  border: 1.5px solid var(--gold);
  border-bottom: 0;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  opacity: .7;
  pointer-events: none;
}

.player-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.player-media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--primary-dark);
}

.player-media.is-loading { background: var(--surface-alt); }

.player-media iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  animation: fade-in .2s ease;
}

.poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: var(--primary-dark);
  cursor: pointer;
  animation: fade-in .2s ease;
}

.poster img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.poster::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgb(10 51 40 / .35);
  transition: background-color .18s ease;
}

.poster:hover::after { background: rgb(10 51 40 / .25); }
.poster:focus-visible { outline-offset: -6px; }

.poster-play {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin: -36px 0 0 -36px;
  border-radius: 50%;
  background: var(--on-primary);
  color: var(--primary);
  box-shadow: 0 6px 20px rgb(0 0 0 / .25);
  transition: background-color .18s ease;
}

.poster:hover .poster-play { background: #fff; }
.poster-play svg { width: 34px; height: 34px; margin-left: 4px; }

.poster-title {
  position: absolute;
  left: var(--space-4);
  bottom: var(--space-3);
  z-index: 1;
  color: var(--on-primary);
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 700;
  text-shadow: 0 1px 8px rgb(0 0 0 / .5);
  font-variant-numeric: lining-nums;
}

:lang(bn) .poster-title { font-weight: 400; }

.player-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-4);
}

@media (min-width: 640px) {
  .player-info { padding: var(--space-5) var(--space-6) var(--space-6); }
}

.player-duration { color: var(--text-muted); font-size: var(--fs-small); font-variant-numeric: tabular-nums; }

.player-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  width: 100%;
  margin-top: var(--space-3);
}

.player-actions .btn { padding: 0 var(--space-2); font-size: .9375rem; }

@media (min-width: 640px) {
  .player-actions { display: flex; flex-wrap: wrap; }
  .player-actions .btn { padding: 0 18px; font-size: inherit; }
}

#copy-btn.is-copied { background: var(--primary-soft); }

.player-actions .btn span { white-space: nowrap; }

@media (max-width: 399px) {
  #youtube-link .icon, #copy-btn .icon { display: none; }
}

/* List card */
.list-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.list-inner { display: flex; flex-direction: column; }

/* On desktop the list is as tall as the player and scrolls on its own. */
@media (min-width: 1024px) {
  .list-card { min-height: 420px; }
  .list-inner { position: absolute; inset: 0; }
  .class-list { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
}

.list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--border);
}

.list-head h3 { font-size: 1.25rem; }

.note {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-3) var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--gold-soft);
  color: var(--text-muted);
  font-size: var(--fs-small);
}

.note .icon { width: 18px; height: 18px; color: var(--gold); }

.class-list {
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
}

.class-list li + li { border-top: 1px solid var(--border); }

.class-row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 44px;
  padding: var(--space-3) var(--space-4);
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background-color .15s ease;
}

@media (min-width: 400px) {
  .class-row { grid-template-columns: 120px minmax(0, 1fr) auto; }
}

.class-row:hover { background: var(--surface-alt); }
.class-row:focus-visible { outline-offset: -3px; }

.class-row[aria-current='true'] {
  background: var(--primary-soft);
  box-shadow: inset 4px 0 0 var(--gold);
}

.class-row img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
}

.row-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.35; }
.row-title { font-weight: 600; color: var(--text); }
.row-duration { color: var(--text-muted); font-size: var(--fs-small); font-variant-numeric: tabular-nums; }

.row-now {
  display: none;
  color: var(--primary);
  font-size: .8125rem;
  font-weight: 600;
}

.class-row[aria-current='true'] .row-now { display: block; }

/* Bengali letters have tall vowel signs above and below the line, so they need more line height. */
:lang(bn) .row-text { line-height: 1.6; }
:lang(bn) .brand-text { line-height: 1.45; }
:lang(bn) .btn, :lang(bn) .lang-toggle { line-height: 1.5; }
:lang(bn) .note { line-height: 1.6; }

@media (max-width: 359px) {
  .brand-name, :lang(bn) .brand-name { font-size: 1rem; }
  .brand-star { width: 22px; height: 22px; }
}

.row-play {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  color: var(--primary);
}

.row-play svg { width: 14px; height: 14px; margin-left: 2px; }

.class-row[aria-current='true'] .row-play {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
}

/* Loading placeholders */
.skeleton-row {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

.skeleton-row span {
  display: block;
  height: 58px;
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  animation: pulse 1.2s ease-in-out infinite alternate;
}

.skeleton-row span + span { height: 16px; width: 60%; align-self: center; }

.list-error {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-4);
}

/* ---------- How to learn ----------
   A path of three steps joined by a thin gold line (vertical on mobile, horizontal on wide screens). */
.steps {
  display: grid;
  gap: var(--space-6);
  max-width: 960px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.step {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: var(--space-4);
  row-gap: var(--space-1);
  align-content: start;
}

.step-num {
  grid-row: span 2;
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1.5px solid var(--gold);
  border-radius: 50%;
  background: var(--surface-alt);
  color: var(--primary);
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: lining-nums;
}

.step:first-child .step-num { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }

/* Line from this step's number to the next one. */
.step:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 23px;
  top: 56px;
  bottom: calc(-1 * var(--space-6) + 8px);
  border-left: 1.5px solid var(--gold);
  opacity: .45;
}

.step h3 { align-self: center; font-size: 1.25rem; }
.step p { color: var(--text-muted); max-width: 34ch; }

@media (min-width: 768px) {
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-6); }
  .step { grid-template-columns: minmax(0, 1fr); row-gap: var(--space-2); }
  .step-num { grid-row: auto; margin-bottom: var(--space-3); }
  .step:not(:last-child)::before {
    left: 60px;
    right: calc(-1 * var(--space-6) + 12px);
    top: 24px;
    bottom: auto;
    border-left: 0;
    border-top: 1.5px solid var(--gold);
  }
}

/* ---------- About ---------- */
.about-layout {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.about-text .divider { margin-bottom: var(--space-1); }
.about-text p { max-width: 52ch; }
.about-text .btn { margin-top: var(--space-3); }

.about-art {
  display: grid;
  place-items: center;
  width: min(100%, 320px);
  aspect-ratio: 3 / 4;
  justify-self: center;
  border: 1.5px solid var(--gold);
  border-radius: 50% 50% var(--radius) var(--radius) / 34% 34% var(--radius) var(--radius);
  background: var(--surface-alt);
  overflow: hidden;
}

.about-art::before { opacity: .09; }

.about-star { width: 72px; height: 72px; color: var(--gold); }

@media (max-width: 639px) {
  .about-art { width: 200px; }
}

@media (min-width: 1024px) {
  .about-layout { grid-template-columns: 1.3fr 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  padding-block: var(--space-7);
  background: var(--primary-dark);
  color: var(--on-primary);
  text-align: center;
  font-size: var(--fs-small);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.footer-inner .brand-star { margin-bottom: var(--space-2); }

.site-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--on-primary);
  font-weight: 600;
}

.footer-part { opacity: .85; }

/* ---------- Motion ---------- */
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pulse { from { opacity: 1; } to { opacity: .45; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}