/* Shared styles for the index and every lesson. Light by default, dark when the device asks.
   Kid-facing text is big (1.25rem and up); grown-up notes are smaller. */

@font-face {
  font-family: "Andika";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/andika-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Andika";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/andika-latin-700-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* Letters with vowel marks (ă ā ĭ ī ŭ ū ...) live in the latin-ext files, fetched only when used. */
@font-face {
  font-family: "Andika";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/andika-latin-ext-400-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Andika";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/andika-latin-ext-700-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  color-scheme: light dark;
  --bg: #fdf8ef;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #555b69;
  --line: #e7dcc8;
  --soft: #f6efe2;
  --accent: #2563c9;
  --accent-soft: #e5eefc;
  --on-accent: #ffffff;
  --good: #17703d;
  --good-soft: #e1f5e8;
  --try: #a34a12;
  --try-soft: #fdeddf;
  --heart: #d0213a;
  --star: #e8a400;
  --guide: #d9d2c4;
  --ink-pen: #2563c9;
  --radius: 18px;
  --emoji: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --card: #1f222a;
    --ink: #eef0f4;
    --muted: #a9afbc;
    --line: #353a47;
    --soft: #262a33;
    --accent: #7ea8ff;
    --accent-soft: #23314d;
    --on-accent: #0d1630;
    --good: #6fd69a;
    --good-soft: #1b3326;
    --try: #ffb27a;
    --try-soft: #3a281b;
    --heart: #ff6b80;
    --star: #ffc93d;
    --guide: #4a4f5c;
    --ink-pen: #7ea8ff;
  }
}

/* Each lesson picks a color family to echo its topic. */
.theme-heart { --accent: #c2263f; --accent-soft: #fde6ea; }
.theme-write { --accent: #0f7a73; --accent-soft: #dcf3f1; --ink-pen: #0f7a73; }
.theme-sh { --accent: #b4500f; --accent-soft: #fdeadb; }
.theme-vowel { --accent: #2a5bd7; --accent-soft: #e4ecfd; }
@media (prefers-color-scheme: dark) {
  .theme-heart { --accent: #ff8496; --accent-soft: #3d1f26; }
  .theme-write { --accent: #5fd3c8; --accent-soft: #163633; --ink-pen: #5fd3c8; }
  .theme-sh { --accent: #ffad6b; --accent-soft: #3b2718; }
  .theme-vowel { --accent: #8fb0ff; --accent-soft: #1f2b4a; }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { font-size: 18px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Andika", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
main, .top-inner, footer {
  max-width: 54rem;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
a { color: var(--accent); }
button { font: inherit; color: inherit; }
/* Emoji appear only as pictures that stand for a word or a sound (README, "Pictures"). */
.pic { font-family: var(--emoji); font-style: normal; }
/* The class's heart over a tricky part, drawn so it takes the theme's color. */
.heart-mark, .tile.heart::before {
  display: inline-block;
  width: 0.9em;
  height: 0.82em;
  background: var(--heart);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 22'%3E%3Cpath d='M12 21.5 10.3 20C4.2 14.5 0 10.8 0 6.4 0 2.8 2.8 0 6.4 0c2 0 4 .9 5.6 2.4C13.6.9 15.6 0 17.6 0 21.2 0 24 2.8 24 6.4c0 4.4-4.2 8.1-10.3 13.6Z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 22'%3E%3Cpath d='M12 21.5 10.3 20C4.2 14.5 0 10.8 0 6.4 0 2.8 2.8 0 6.4 0c2 0 4 .9 5.6 2.4C13.6.9 15.6 0 17.6 0 21.2 0 24 2.8 24 6.4c0 4.4-4.2 8.1-10.3 13.6Z'/%3E%3C/svg%3E") center / contain no-repeat;
}
.heart-mark { vertical-align: -0.05em; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- top bar ---------- */
.top {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 3.5rem;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
}
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 0.4rem;
  color: var(--muted);
}
.crumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  font-weight: 700;
  text-decoration: none;
}
.crumbs a:hover { text-decoration: underline; }
.read-toggle {
  min-height: 44px;
  padding: 0.3rem 0.85rem;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.9rem;
  cursor: pointer;
}
.read-toggle[aria-pressed="false"] { color: var(--muted); }

/* ---------- page heading ---------- */
.hero {
  padding: 1.75rem 0 0.5rem;
}
.hero h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
  line-height: 1.2;
}
.hero p {
  margin: 0;
  font-size: 1.2rem;
  color: var(--muted);
}
.jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}
.jump a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.2rem 0.9rem;
  background: var(--accent-soft);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

/* ---------- sections ---------- */
.card {
  margin: 1.25rem 0;
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.card > h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
  font-size: 1.55rem;
  line-height: 1.25;
}
.card h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.3rem;
}
.card h3:first-of-type { margin-top: 0.5rem; }
.kid {
  font-size: 1.3rem;
  line-height: 1.55;
}
.kid p { margin: 0 0 0.8rem; }
.say-line {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}
.say-line > p, .say-line > div { flex: 1; margin-top: 0.15rem; }

/* The read-aloud button that sits next to kid-facing text. */
.say {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: var(--accent-soft);
  border: 2px solid transparent;
  border-radius: 50%;
  color: var(--accent);
  cursor: pointer;
}
.say .icon, .say .icon svg { display: block; width: 1.5rem; height: 1.5rem; }
.say:hover { border-color: var(--accent); }
.say.wide {
  width: auto;
  padding: 0 1rem;
  border-radius: 999px;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 700;
  gap: 0.4rem;
}
.say.wide .icon, .say.wide .icon svg { width: 1.25rem; height: 1.25rem; color: var(--accent); }
.no-speech .say, .say:empty { display: none !important; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 52px;
  padding: 0.4rem 1.25rem;
  background: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 14px;
  color: var(--on-accent);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--accent);
}
.btn:disabled { opacity: 0.5; cursor: default; }
.btn .icon, .btn .icon svg { display: block; width: 1.25rem; height: 1.25rem; }
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-top: 0.9rem;
}

/* ---------- quiz ---------- */
.quiz {
  margin-top: 0.5rem;
  padding: 1rem;
  background: var(--soft);
  border-radius: 16px;
}
.quiz-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 1rem;
  color: var(--muted);
}
.quiz-stars { color: var(--star); font-size: 1.15rem; letter-spacing: 0.08em; }
.quiz-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  margin: 0.75rem auto;
  padding: 1rem;
  max-width: 24rem;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 18px;
  text-align: center;
}
.quiz-pic {
  font-family: var(--emoji);
  font-size: 4.5rem;
  line-height: 1.1;
}
.quiz-pic svg { width: 5rem; height: 5rem; }
.quiz-pic svg.listen { color: var(--accent); }
.quiz-word {
  margin: 0;
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
}
.quiz-word .blank {
  display: inline-block;
  min-width: 1.8em;
  border-bottom: 4px solid var(--accent);
  color: var(--accent);
}
.quiz-sentence { font-size: 1.6rem; }
.quiz-help {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}
.quiz-ask {
  margin: 0.5rem 0;
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
}
.quiz-choices {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}
.choice {
  min-width: 7rem;
  min-height: 64px;
  padding: 0.5rem 1rem;
  background: var(--card);
  border: 3px solid var(--line);
  border-radius: 16px;
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.1s;
}
.choice small {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--muted);
}
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice:active:not(:disabled) { transform: scale(0.97); }
.choice.right {
  background: var(--good-soft);
  border-color: var(--good);
}
.choice.wrong {
  background: var(--try-soft);
  border-color: var(--try);
  opacity: 0.65;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}
.choice:disabled { cursor: default; }
.feedback {
  min-height: 2.2rem;
  margin: 0.75rem 0 0;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
}
.feedback.good { color: var(--good); }
.feedback.try { color: var(--try); }
.quiz-next { display: flex; justify-content: center; margin-top: 0.5rem; }
.quiz-done {
  text-align: center;
  padding: 1rem 0.5rem;
}
.quiz-done .big {
  display: block;
  color: var(--star);
  font-size: 4rem;
  line-height: 1.1;
}
.quiz-done p {
  margin: 0.5rem 0;
  font-size: 1.4rem;
  font-weight: 700;
}
.quiz-done .row { justify-content: center; }

/* ---------- letter tiles (heart words, digraphs) ---------- */
.tiles {
  display: inline-flex;
  gap: 0.3rem;
  align-items: flex-end;
}
.tile {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.6rem;
  height: 3.4rem;
  padding: 0 0.35rem;
  background: var(--card);
  border: 3px solid var(--line);
  border-radius: 12px;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}
button.tile { cursor: pointer; }
button.tile:hover { border-color: var(--accent); }
.tile.picked {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.tile.heart {
  color: var(--heart);
  border-color: var(--heart);
}
.tile.heart::before {
  content: "";
  position: absolute;
  top: -1.05rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1rem;
}

/* ---------- sound and word cards (tap to hear) ---------- */
.sound-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 1rem 0 0.4rem;
}
.sound-row .op {
  font-size: 2rem;
  font-weight: 700;
  color: var(--muted);
}
.sound-card, .word-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  min-width: 8rem;
  padding: 0.9rem 1rem 0.7rem;
  background: var(--card);
  border: 3px solid var(--line);
  border-radius: 18px;
  cursor: pointer;
}
.sound-card:hover, .word-card:hover { border-color: var(--accent); }
.sound-card > .pic, .word-card > .pic { font-size: 2.4rem; line-height: 1; }
.sound-card.star {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.sound-label {
  font-size: 1rem;
  color: var(--muted);
}
.tile.hot {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.note {
  margin: 0 0 1rem;
  font-size: 1rem;
  color: var(--muted);
  text-align: center;
}

/* Room for the hearts that sit above heart-part tiles. */
.heart-row .word-card, .quiz-card > .tiles { padding-top: 1.5rem; }
.quiz-card button.tile { min-width: 3rem; height: 3.8rem; font-size: 2.4rem; }
.finder-actions, .flash-actions { justify-content: center; }
.flash-word { padding: 1rem 0; font-size: 3.6rem; }

/* ---------- vowel chart ---------- */
.mark { font-weight: 700; color: var(--accent); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin: 0.5rem 0 0.75rem; }
.grid.two h3 { margin: 0 0 0.2rem; }
.vowel-table {
  display: grid;
  gap: 0.5rem;
  margin: 0.5rem 0 1rem;
}
.vowel-row {
  display: grid;
  grid-template-columns: 3.2rem 1fr 1fr;
  gap: 0.5rem;
  align-items: stretch;
  padding: 0.4rem;
  border-radius: 16px;
}
.vowel-row.focus { background: var(--accent-soft); }
.vowel-letter {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
}
.vowel-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 64px;
  padding: 0.4rem 0.8rem;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 14px;
  font-size: 1.1rem;
  text-align: left;
  cursor: pointer;
}
.vowel-card:hover { border-color: var(--accent); }
.vowel-card .mark { font-size: 1.9rem; min-width: 1.4em; }
.vowel-card .pic { font-size: 1.8rem; }
.vowel-card .pic svg { display: block; width: 2.2rem; height: 2.2rem; }
.name-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 2px solid var(--accent);
  border-radius: 8px;
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 700;
}
@media (max-width: 30rem) {
  .vowel-row { grid-template-columns: 2.4rem 1fr 1fr; gap: 0.35rem; padding: 0.3rem; }
  .vowel-card { flex-wrap: wrap; gap: 0.3rem; padding: 0.4rem 0.5rem; font-size: 0.95rem; }
  .vowel-card .mark { font-size: 1.5rem; }
}
.action-pick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--soft);
  border-radius: 16px;
}
.action-prompt {
  flex: 1 1 14rem;
  min-height: 2rem;
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}
.action-prompt .mark { font-size: 1.8rem; }

/* ---------- small pieces ---------- */
.pill {
  display: inline-block;
  padding: 0.05rem 0.6rem;
  background: var(--accent-soft);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  gap: 0.75rem;
}
.box {
  padding: 0.9rem 1rem;
  background: var(--soft);
  border-radius: 14px;
}
.box h3, .box h4 { margin: 0 0 0.35rem; font-size: 1.15rem; }
.box p { margin: 0; }
.world {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.world li {
  padding: 0.85rem 1rem;
  background: var(--soft);
  border-radius: 14px;
  font-size: 1.1rem;
}
.world strong { display: block; }

/* ---------- grown-up notes ---------- */
details.grownups {
  margin: 1.25rem 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 1rem;
}
details.grownups > summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 56px;
  padding: 0.6rem 1.25rem;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
}
details.grownups > div { padding: 0 1.25rem 1.25rem; }
details.grownups h3 { margin: 1.1rem 0 0.35rem; font-size: 1.1rem; }
details.grownups ul { padding-left: 1.25rem; margin: 0.35rem 0; }
details.grownups li { margin: 0.25rem 0; }

/* ---------- celebration ---------- */
.burst {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 10;
}
.burst span {
  position: absolute;
  top: -2rem;
  color: var(--star);
  font-size: 1.8rem;
  animation: fall 1.6s ease-in forwards;
}
.burst .c1 { color: var(--accent); }
.burst .c2 { color: var(--heart); }
@keyframes fall {
  to { transform: translateY(110vh) rotate(260deg); opacity: 0.2; }
}
@keyframes wiggle {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}
.wiggle { animation: wiggle 0.3s ease-in-out 2; }
@media (prefers-reduced-motion: reduce) {
  .burst { display: none; }
  .wiggle { animation: none; }
  .choice { transition: none; }
}

/* ---------- footer ---------- */
footer {
  padding-top: 1rem;
  padding-bottom: 2.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}
footer p { margin: 0.25rem 0; }

@media (max-width: 30rem) {
  html { font-size: 17px; }
  /* Keep a sound equation (s + h = sh) on one line. */
  .sound-row.math { flex-wrap: nowrap; gap: 0.3rem; }
  .sound-row.math .sound-card { flex: 1 1 0; min-width: 0; padding: 0.6rem 0.3rem 0.5rem; }
  .sound-row.math .op { font-size: 1.4rem; }
  .sound-row.math .sound-label { font-size: 0.8rem; text-align: center; }
  .card { padding: 1rem 0.85rem; }
  .hero h1 { font-size: 1.7rem; }
  .choice { min-width: 6rem; font-size: 1.3rem; }
  .tile { min-width: 2.3rem; height: 3rem; font-size: 1.7rem; }
}
@media print {
  .top, .say, .read-toggle, .jump, .quiz-next { display: none !important; }
  details.grownups > div { display: block; }
  body { background: #fff; color: #000; }
}