/* TET Sadhana — shared stylesheet. Teacher's notebook direction:
   paper-white, ink, one calm teal accent, amber used sparingly.
   1px outlines, no shadows, no gradients. */

:root {
  --bg: #FBFAF7;
  --surface: #FFFFFF;
  --surface-muted: #F1EFEA;
  --ink: #1C1B19;
  --ink-muted: #5E5A53;
  --outline: #D9D5CD;
  --primary: #1F6F78;
  --on-primary: #FFFFFF;
  --accent-warm: #C7781A;
  --correct: #2E7D4F;
  --incorrect: #B3402F;
  --radius: 10px;
  --radius-sm: 6px;
  --content-width: 46rem;
  --wide-width: 64rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --surface: #1B1E22;
    --surface-muted: #24282D;
    --ink: #ECEAE6;
    --ink-muted: #A8A39B;
    --outline: #3A3F45;
    --primary: #7CC4CC;
    --on-primary: #00363B;
    --accent-warm: #F0B062;
    --correct: #7FD3A0;
    --incorrect: #F29A8A;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
}

body {
  font-family: "Noto Sans", "Noto Sans Telugu", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

:lang(te), .te {
  font-family: "Noto Sans Telugu", "Noto Sans", system-ui, sans-serif;
  line-height: 1.65;
}

h1, h2, h3, h4 {
  font-family: "Anek Telugu", "Noto Sans Telugu", "Noto Sans", system-ui, sans-serif;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 0.6em;
  color: var(--ink);
}

h1 { font-size: 1.9rem; line-height: 1.25; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; max-width: 36rem; }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin-bottom: 0.4em; }

a {
  color: var(--primary);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2px;
}
a:hover { text-decoration-thickness: 2px; }

strong { font-weight: 600; }

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

:focus-visible {
  outline: 2.5px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: var(--on-primary);
  padding: 0.75em 1em;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Layout shell ---------- */
.site-header {
  border-bottom: 1px solid var(--outline);
  background: var(--bg);
}

.header-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  min-height: 48px;
}
.brand svg { width: 34px; height: 34px; flex-shrink: 0; }
.brand-name {
  font-family: "Anek Telugu", "Noto Sans Telugu", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  line-height: 1.15;
}
.brand-name small {
  display: block;
  font-weight: 400;
  font-size: 0.72rem;
  color: var(--ink-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
}
.main-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.6rem 0.1rem;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
}
.main-nav a:hover { color: var(--primary); }

.lang-switch {
  border: 1px solid var(--outline);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  color: var(--ink);
  text-decoration: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); }

main { flex: 1; width: 100%; }

.wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.2rem 1.1rem 3rem;
}
.wrap-wide {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 2.2rem 1.1rem 3rem;
}

/* ---------- Hero ---------- */
.hero {
  border-bottom: 1px solid var(--outline);
}
.hero-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 2.6rem 1.1rem 2.8rem;
}
.hero .eyebrow {
  color: var(--primary);
  font-size: 0.95rem;
  margin: 0 0 0.6rem;
}
.hero h1 { max-width: 20ch; }
.hero .lede {
  font-size: 1.08rem;
  color: var(--ink-muted);
  max-width: 42ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: 48px;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--primary);
  background: var(--primary);
  color: var(--on-primary);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  line-height: 1.2;
}
.btn:hover { opacity: 0.9; }
.btn:visited { color: var(--on-primary); }

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--outline);
}
.btn-secondary:hover { border-color: var(--primary); }
.btn-secondary:visited { color: var(--primary); }

.btn[disabled], .btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* Flip .store-live on when the Play listing is public */
.badge-soon {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--surface-muted);
  color: var(--ink-muted);
  border-radius: 999px;
  padding: 0.15em 0.6em;
  margin-left: 0.5em;
  vertical-align: middle;
}
.store-live .badge-soon { display: none; }

/* ---------- Cards ---------- */
.card {
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.3rem 1.3rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: 1rem;
  margin: 1.6rem 0;
}

.section {
  padding: 2.2rem 0;
  border-top: 1px solid var(--outline);
}
.section:first-child { border-top: none; }

.section-title { margin-bottom: 1.2rem; }

/* ---------- Pricing ---------- */
.price-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.1rem;
  margin: 1.6rem 0;
}
.price-card {
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
}
.price-card.is-featured { border-color: var(--primary); border-width: 2px; }
.price-card .tier-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.2rem; }
.price-card .tier-price {
  font-family: "Anek Telugu", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  margin: 0.25rem 0 0.9rem;
}
.price-card .tier-price small { font-size: 0.95rem; font-weight: 500; color: var(--ink-muted); }
.price-card ul { padding-left: 0; list-style: none; margin-bottom: 1.1rem; flex: 1; }
.price-card li {
  padding-left: 1.5em;
  position: relative;
  font-size: 0.95rem;
}
.price-card li::before {
  content: "";
  position: absolute;
  left: 0.1em;
  top: 0.45em;
  width: 0.55em;
  height: 0.55em;
  border-left: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: rotate(-45deg);
}

/* ---------- Tracks list ---------- */
.track-list { list-style: none; padding: 0; margin: 1.2rem 0; }
.track-list li {
  border: 1px solid var(--outline);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  margin-bottom: 0.6rem;
  font-size: 0.97rem;
}
.track-list .track-tag {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 999px;
  padding: 0.05em 0.6em;
  margin-right: 0.5em;
}

/* ---------- Steps ---------- */
.steps { padding-left: 0; list-style: none; counter-reset: step; margin: 1.4rem 0; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 1.1rem 2.5rem;
  border-left: 1.5px solid var(--outline);
  margin-left: 0.9rem;
}
.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: -0.9rem;
  top: -0.1rem;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  background: var(--surface);
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Table-ish definition rows (version info etc.) ---------- */
.kv-list { border: 1px solid var(--outline); border-radius: var(--radius); overflow: hidden; margin: 1.4rem 0; }
.kv-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--outline);
  font-size: 0.93rem;
}
.kv-row:first-child { border-top: none; }
.kv-row dt { color: var(--ink-muted); }
.kv-row dd { margin: 0; font-weight: 600; text-align: right; word-break: break-word; }

/* ---------- Notice / callout ---------- */
.notice {
  border: 1px solid var(--outline);
  border-left: 3px solid var(--accent-warm);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  background: var(--surface-muted);
  font-size: 0.95rem;
  margin: 1.4rem 0;
}
.notice.is-primary { border-left-color: var(--primary); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--outline);
  background: var(--surface-muted);
  font-size: 0.86rem;
  color: var(--ink-muted);
}
.footer-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 2rem 1.1rem 2.4rem;
}
.footer-disclaimer {
  max-width: 54rem;
  margin: 0 0 1.2rem;
  line-height: 1.6;
}
.footer-disclaimer + .footer-disclaimer { margin-top: -0.6rem; }
.footer-disclaimer { font-size: 0.75rem; }
.footer-disclaimer.te { font-size: 0.8rem; } /* Telugu glyphs need a little more size to stay legible */
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  padding: 0;
  margin: 0 0 1.2rem;
  list-style: none;
}
.footer-links a { color: var(--ink-muted); }
.footer-links a:hover { color: var(--primary); }
.footer-seller { font-size: 0.75rem; line-height: 1.6; margin: 0; } /* 12px: smallest still clearly legible; legal details must stay readable */
.footer-copy { font-size: 0.75rem; margin-top: 1rem; opacity: 0.85; }

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.text-muted { color: var(--ink-muted); }
.mt-0 { margin-top: 0; }
.center { text-align: center; }

code, .mono {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
  background: var(--surface-muted);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  word-break: break-all;
}

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .hero-inner, .wrap, .wrap-wide { padding-left: 1rem; padding-right: 1rem; }
  .price-card .tier-price { font-size: 1.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}