/* 自然發音學習手冊 — Phonics Handbook, 中高年級.
   Shares Sound Lab's warm palette and chunky-button language so the two
   phonics pages read as one family, but laid out as a book with a contents
   sidebar, because this one is a handbook to look things up in, not a game
   to play through. Light theme only — classroom projectors and school
   tablets are almost always in light mode. */

:root {
  --bg: #fff8ef;
  --bg-2: #ffeedd;
  --ink: #2c2440;
  --ink-soft: #6b6180;
  --card: #ffffff;
  --line: #e8ddd0;

  --green: #22a06b;
  --green-soft: #d8f5e8;
  --orange: #f08c2e;
  --orange-soft: #ffead4;
  --blue: #3b82d6;
  --blue-soft: #ddeafc;
  --purple: #8b5cf6;
  --purple-soft: #ece5fe;

  --good: #22a06b;
  --oops: #e8734a;
  --mark: #e05252;
  --mark-soft: #ffe0e0;

  --radius: 18px;
  --shadow: 0 3px 0 rgba(44, 36, 64, .12);

  --sans: "Nunito", "Quicksand", "Trebuchet MS", "Avenir Next",
          "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system, sans-serif;
  --mono: "Menlo", "Consolas", "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }
html, body { margin: 0; padding: 0; min-height: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

/* The warm gradient sits on a fixed layer of its own. Painting it with
   background-attachment: fixed instead would force the browser to repaint
   the whole page on every scroll — and this is a long page. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(170deg, var(--bg) 0%, var(--bg-2) 100%);
}

button {
  font-family: inherit;
  color: inherit;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 12px; top: 12px; z-index: 30;
  background: var(--card); padding: 10px 16px; border-radius: 12px;
}

/* ---------------- top bar ---------------- */

.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  padding-top: max(10px, env(safe-area-inset-top, 0px));
  background: rgba(255, 248, 239, .92);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--line);
}

.bar-title {
  flex: 1;
  margin: 0;
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: .02em;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bar-title span {
  font-size: .8rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-left: 6px;
}

.bar-btn {
  border: 2px solid var(--line);
  background: var(--card);
  border-radius: 14px;
  padding: 7px 12px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.bar-btn:active { transform: translateY(2px); box-shadow: none; }
.bar-btn-quiet { opacity: .75; }

/* ---------------- shell: contents + book ---------------- */

.shell {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 26px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 18px 80px;
}

#nav {
  position: sticky;
  top: 76px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: calc(100vh - 100px);
  overflow: auto;
}

.nav-item {
  display: block;
  padding: 9px 13px;
  border-radius: 13px;
  border: 2px solid transparent;
  color: var(--ink-soft);
  font-weight: 700;
  font-size: .95rem;
  text-decoration: none;
  line-height: 1.4;
}

.nav-item:hover { background: var(--card); }

.nav-item.is-here {
  background: var(--card);
  border-color: var(--line);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.nav-num {
  display: block;
  font-size: .72rem;
  font-weight: 800;
  color: var(--purple);
  letter-spacing: .08em;
}

.nav-ico { margin-right: 6px; }

.nav-scrim {
  display: none;
}

/* ---------------- sections ---------------- */

.sec {
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 28px 30px;
  margin-bottom: 26px;
}

.sec-head { margin-bottom: 14px; }

.sec-num {
  margin: 0;
  color: var(--purple);
  font-weight: 800;
  font-size: .85rem;
  letter-spacing: .14em;
}

.sec-head h2 {
  margin: 2px 0 0;
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: .01em;
}

.sec-ico { margin-right: 10px; }

/* A word's small picture. Emoji sit a touch large against our type, so they
   are scaled down and must never take the dotted tap-underline. */
.pic { font-size: .95em; }
.tok .pic, .pword .pic { border-bottom: 0; }

.h3 {
  margin: 30px 0 10px;
  font-size: 1.18rem;
  font-weight: 800;
  padding-left: 12px;
  border-left: 5px solid var(--orange);
}

.h4 {
  margin: 24px 0 8px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink);
}

.para { margin: 10px 0; }

.demo {
  margin: 12px 0;
  padding: 12px 16px;
  background: var(--purple-soft);
  border-radius: 14px;
  font-weight: 700;
  font-size: 1.05rem;
}

.kicker {
  margin: 26px 0 6px;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--purple);
}

/* 學習目標 */

.goals {
  background: var(--blue-soft);
  border-radius: 14px;
  padding: 12px 18px;
  margin: 6px 0 16px;
}

.goals-head { margin: 0; font-weight: 800; color: var(--blue); font-size: .95rem; }
.goals ol { margin: 6px 0 2px; padding-left: 24px; }
.goals li { margin: 2px 0; }

.biglist { padding-left: 26px; }
.biglist li { margin: 8px 0; }

/* English words inside running text: tappable, but drawn as text with a
   quiet underline so a paragraph does not become a wall of buttons. */
.tok {
  display: inline;
  border: 0;
  background: none;
  padding: 0 1px;
  font: inherit;
  font-weight: 700;
  color: var(--blue);
  cursor: pointer;
  border-bottom: 2px dotted color-mix(in srgb, var(--blue) 45%, transparent);
}

.tok:active { color: var(--purple); }

/* ---------------- callouts ---------------- */

.note {
  margin: 16px 0;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--orange-soft);
}

.note-think { background: var(--purple-soft); }
.note-try { background: var(--green-soft); }

.note-head {
  margin: 0 0 4px;
  font-weight: 800;
  font-size: .98rem;
}

.note-icon { margin-right: 6px; }
.note-line { margin: 4px 0; }

/* ---------------- word chips ---------------- */

.chips { margin: 12px 0; }

.chips-label {
  margin: 0 0 6px;
  font-weight: 800;
  color: var(--ink-soft);
  font-size: .95rem;
}

.chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 8px 14px;
  min-height: 44px;
  justify-content: center;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.25;
}

.chip:active { transform: translateY(2px); box-shadow: none; }

.chip.is-speaking { border-color: var(--blue); background: var(--blue-soft); }

.chip-eg { font-size: .8rem; font-weight: 700; color: var(--ink-soft); }
.chip-note { font-size: .72rem; font-weight: 700; color: var(--orange); }

/* 檢測模式: chips stop speaking and start taking marks. */

body.mark-mode .chip { cursor: crosshair; }

.chip.is-marked {
  border-color: var(--mark);
  background: var(--mark-soft);
  position: relative;
}

.chip.is-marked::after {
  content: '✗';
  position: absolute;
  top: -9px;
  right: -7px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--mark);
  color: #fff;
  font-size: .72rem;
  font-weight: 800;
  line-height: 20px;
  text-align: center;
}

/* ---------------- before → after pairs ---------------- */

.pairs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 12px 0;
}

.pairline { display: flex; align-items: center; gap: 8px; }

.pword {
  border: 2px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 6px 13px;
  font-size: 1.02rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.pword:active { transform: translateY(2px); box-shadow: none; }
.pword-after { border-color: var(--green); background: var(--green-soft); }
.pair-arrow { font-weight: 800; color: var(--ink-soft); }

/* ---------------- tables ---------------- */

.table-wrap { overflow-x: auto; margin: 12px 0; }

.tbl {
  border-collapse: collapse;
  width: 100%;
  min-width: 480px;
  font-size: .98rem;
}

.tbl th {
  text-align: left;
  padding: 8px 12px;
  background: var(--bg);
  border-bottom: 2px solid var(--line);
  font-size: .88rem;
  letter-spacing: .04em;
  white-space: nowrap;
}

.tbl td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.tbl td:first-child { white-space: nowrap; font-size: 1.02rem; }

/* ---------------- worked example ---------------- */

.ex {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 12px 0;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: 14px;
}

.ex-word {
  border: 0;
  background: none;
  font-size: 1.3rem;
  font-weight: 800;
  cursor: pointer;
  color: var(--ink);
  border-bottom: 2px dotted color-mix(in srgb, var(--ink) 35%, transparent);
  padding: 0 2px;
}

.ex-arrow { font-weight: 800; color: var(--ink-soft); }

.ex-syll {
  border: 0;
  background: none;
  cursor: pointer;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--purple);
  padding: 0;
}

.ex-syll i { font-style: normal; color: var(--orange); padding: 0 2px; }

/* ---------------- the cutting game ---------------- */

.cuts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0;
}

.cut {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  max-width: 100%;
  overflow-x: auto;
}

.cut.is-wrong { animation: wobble .4s; }

@keyframes wobble {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

.cut-say {
  border: 0;
  background: none;
  font-size: .95rem;
  cursor: pointer;
  opacity: .6;
  padding: 2px 4px;
  flex: none;
}

.cut-word {
  display: inline-flex;
  align-items: center;
}

.lt {
  font-size: 1.35rem;
  font-weight: 800;
  padding: 2px 1px;
}

/* The gap between two letters: an invisible knife slot, tall enough for a
   finger. A placed cut widens and shows the blade line. */
.gap {
  border: 0;
  background: none;
  width: 9px;
  align-self: stretch;
  min-height: 40px;
  cursor: pointer;
  position: relative;
  padding: 0;
  flex: none;
}

.gap::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 15%;
  bottom: 15%;
  width: 3px;
  margin-left: -1.5px;
  border-radius: 2px;
  background: transparent;
}

.gap:hover::after { background: var(--line); }

.gap.is-cut { width: 18px; }
.gap.is-cut::after { background: var(--orange); }

.cut.is-done { border-color: var(--good); background: var(--green-soft); }
.cut.is-done .gap.is-cut::after { background: var(--good); }
.cut.is-done .gap { cursor: default; }

.cut-tick {
  display: none;
  color: var(--good);
  font-weight: 800;
  margin-left: 2px;
}

.cut.is-done .cut-tick { display: inline; }

/* ---------------- 字首＋字根＋字尾 ---------------- */

.morphs {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 12px 0;
}

.morph {
  border: 2px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.morph-word {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  border: 0;
  background: none;
  padding: 11px 16px;
  font-size: 1.12rem;
  font-weight: 800;
  cursor: pointer;
  text-align: left;
}

.morph-hint {
  font-size: .78rem;
  font-weight: 800;
  color: var(--purple);
  background: var(--purple-soft);
  border-radius: 10px;
  padding: 2px 10px;
}

.morph.is-open .morph-hint { display: none; }

.morph-body { padding: 0 16px 13px; }

.morph-parts {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.mp {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  border-radius: 12px;
  padding: 6px 14px;
}

.mp b { font-size: 1.08rem; }
.mp i { font-style: normal; font-size: .78rem; color: var(--ink-soft); font-weight: 700; }

.mp:first-child { background: var(--orange-soft); }
.mp:last-child { background: var(--blue-soft); }

.mp-plus { font-weight: 800; color: var(--ink-soft); }

.morph-zh { margin: 8px 0 0; font-weight: 700; color: var(--ink-soft); }

/* ---------------- word families ---------------- */

.families {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 12px 0;
}

.fam-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 7px;
}

.fam-root {
  border: 0;
  cursor: pointer;
  background: var(--purple);
  color: #fff;
  font-size: 1.15rem;
  font-weight: 800;
  border-radius: 12px;
  padding: 4px 16px;
  box-shadow: var(--shadow);
}

.fam-root:active { transform: translateY(2px); box-shadow: none; }
.fam-gloss { font-weight: 800; color: var(--ink-soft); }

/* ---------------- teacher panel ---------------- */

.panel {
  position: fixed;
  top: 66px;
  right: 12px;
  z-index: 20;
  width: min(360px, calc(100vw - 24px));
  max-height: calc(100vh - 90px);
  overflow: auto;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(44, 36, 64, .18);
  padding: 16px 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.panel-head h2 { margin: 0; font-size: 1.1rem; }

.panel-x {
  border: 0; background: none; font-size: 1rem; cursor: pointer;
  padding: 4px 8px; opacity: .7;
}

.row { margin: 14px 0; }
.row label { display: block; font-weight: 800; font-size: .92rem; margin-bottom: 4px; }

.row-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 800;
  cursor: pointer;
}

.row-check input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--mark); }
.row-check em { display: block; font-style: normal; font-weight: 600; font-size: .85rem; color: var(--ink-soft); }

.row-note { margin: 6px 0 0; font-size: .84rem; color: var(--ink-soft); line-height: 1.55; }

.panel-btn {
  border: 2px solid var(--line);
  background: var(--bg);
  border-radius: 12px;
  padding: 8px 14px;
  font-weight: 800;
  cursor: pointer;
}

.panel-btn:active { transform: translateY(2px); }
.panel-btn-quiet { opacity: .8; }

.panel select {
  width: 100%;
  font: inherit;
  padding: 7px 10px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}

.mark-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.mark-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px dashed var(--line);
}

.mark-say {
  border: 0; background: none; cursor: pointer;
  font-weight: 800; font-size: 1rem; color: var(--mark);
  padding: 2px 0;
}

.mark-label { flex: 1; font-size: .78rem; color: var(--ink-soft); }

.mark-x {
  border: 0; background: none; cursor: pointer;
  opacity: .55; font-size: .85rem; padding: 3px 6px;
}

.muted { color: var(--ink-soft); font-size: .88rem; }

/* ---------------- 發音檢查 ---------------- */

.cue-wrap {
  max-height: 220px;
  overflow: auto;
  border: 2px solid var(--line);
  border-radius: 12px;
  margin-top: 8px;
}

.cue-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-bottom: 1px solid var(--line);
}

.cue-row:last-child { border-bottom: 0; }
.cue-row.is-playing { background: var(--blue-soft); }
.cue-row.is-bad { background: var(--mark-soft); }

.cue-play, .cue-bad-btn {
  border: 0;
  background: none;
  cursor: pointer;
  font-size: .8rem;
  padding: 3px 5px;
  border-radius: 8px;
  flex: none;
}

.cue-play { color: var(--blue); font-weight: 800; }
.cue-bad-btn { opacity: .35; margin-left: auto; }
.cue-bad-btn[aria-pressed="true"] { opacity: 1; }

.cue-head {
  margin: 0;
  padding: 6px 10px 4px;
  font-size: .76rem;
  font-weight: 800;
  color: var(--ink-soft);
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  /* Above the rows, or a scrolled row's 👎 shows through the header. */
  z-index: 1;
}

.cue-key { font-weight: 800; min-width: 46px; font-size: .92rem; }
.cue-row-word .cue-key { min-width: 74px; }
.cue-row-word .cue-say { font-family: var(--sans); font-size: .78rem; }
.cue-say { color: var(--ink-soft); font-size: .84rem; font-family: var(--mono, monospace); }

.cue-bad {
  width: 100%;
  font: inherit;
  font-size: .82rem;
  padding: 7px 10px;
  border: 2px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  resize: vertical;
}

/* ---------------- phones ---------------- */

@media (max-width: 780px) {
  /* minmax(0, …), not a bare 1fr: the widest cut word must squeeze the
     column, not stretch it past the screen. */
  .shell { grid-template-columns: minmax(0, 1fr); padding: 14px 10px 60px; }

  #nav {
    position: fixed;
    inset: 0 auto 0 0;
    top: 0;
    z-index: 25;
    width: min(300px, 84vw);
    max-height: none;
    background: var(--card);
    padding: 18px 14px;
    padding-top: max(18px, env(safe-area-inset-top, 0px));
    box-shadow: 8px 0 30px rgba(44, 36, 64, .2);
    transform: translateX(-105%);
    transition: transform .2s ease;
  }

  body.nav-open #nav { transform: translateX(0); }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 24;
    background: rgba(44, 36, 64, .35);
  }

  .nav-scrim[hidden] { display: none; }

  .sec { padding: 18px 16px 22px; }
  .bar-title span { display: none; }
  .lt { font-size: 1.22rem; }
}

/* ---------------- print: the handbook as a handout ---------------- */

@media print {
  body { background: #fff; font-size: 11pt; }
  .bar, #nav, .nav-scrim, .panel,
  .cut-say, .morph-hint { display: none !important; }
  .shell { display: block; padding: 0; }
  .sec {
    box-shadow: none;
    border: 0;
    padding: 0 0 18px;
    margin: 0 0 18px;
    break-inside: auto;
  }
  .sec-head { break-after: avoid; }
  .note, .chips, .goals, .ex, .pairline, .morph, .fam, .cut { break-inside: avoid; }
  .tok { color: inherit; border-bottom: 0; font-weight: inherit; }
  .chip, .cut, .pword, .morph { box-shadow: none; }
  .gap { min-height: auto; }
  .morph-body { display: block !important; }
  .morph-body[hidden] { display: block !important; }
}

/* ---------------- 站尾 / site footer ----------------

   同一段樣式複製到每一頁。各頁的色票變數名稱不一樣（兒童頁沒有 --ink-faint、
   成人頁沒有 --blue），所以每個顏色都串一條 fallback，缺哪一個都還是看得到。

   標誌是全站唯一的共用圖檔，放在 public/logo.png，子頁用 ../logo.png 取用。
   它本身就是連結，所以要把文字連結那條底線和左邊距擋掉——文字連結的樣式因此
   收窄成 .site-foot p a，不再套用到整個站尾裡的每個 a。 */

.site-foot {
  max-width: 46rem;
  margin: 0 auto;
  padding: 26px 20px 40px;
  border-top: 1px solid var(--line, #e3e0d8);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 14px;
  /* 換行之後（手機）文字會落到標誌下面一整行，置中才不會左右不對稱。 */
  text-align: center;
  font-family: var(--font-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif);
  font-size: .8rem;
  line-height: 1.7;
  color: var(--ink-faint, var(--ink-soft, #7a8290));
}
.site-foot p { margin: 0; }

.site-foot .site-mark {
  flex: none;
  margin: 0;
  padding: 0;
  border: 0;
  line-height: 0;
  border-radius: 50%;
  transition: opacity .12s;
}
.site-foot .site-mark img { display: block; width: 34px; height: 34px; }
.site-foot .site-mark:hover { opacity: .78; }

.site-foot p a {
  margin-left: 7px;
  padding-bottom: 1px;
  color: var(--navy, var(--blue, #1d3f6e));
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.site-foot p a:hover { opacity: .7; }

@media print { .site-foot { display: none; } }