/* Out Loud Digital. Series rule: Literata for what is read; IBM Plex Sans for what is done and looked at.
   Layout: one column ≤ 44rem, phone first; board mode is the same layout, larger. */
:root {
  --paper: #F6F7F5;
  --card: #FFFFFF;
  --ink: #1E2A2E;
  --muted: #56676B;
  --line: #D6DEDD;
  --accent: #0E6B77;      /* Student's Book brand colour */
  --accent-ink: #FFFFFF;
  --accent-soft: #E1EEEF;
  --p: #B8432A;           /* series terracotta */
  --ok: #2B7A47;
  --ok-soft: #E2F1E7;
  --bad: #B8432A;
  --bad-soft: #F8E7E2;
  --sun: #E8B33A;
  --sh-or: #F39200;       /* shelter: civil defence sign */
  --sh-bl: #1F4E9E;
  --read: 'Literata', 'PT Serif', Georgia, serif;
  --do: 'IBM Plex Sans', 'PT Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --r: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111A1C; --card: #182427; --ink: #E6ECEC; --muted: #9DAEB1; --line: #2B393C;
    --accent: #5BB8C4; --accent-ink: #08191B; --accent-soft: #173539; --p: #E58B71;
    --ok: #6CC48C; --ok-soft: #16301F; --bad: #EE937A; --bad-soft: #3A211A; --sun: #E8B33A;
    --sh-or: #F6A23A; --sh-bl: #7FA6E8;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #111A1C; --card: #182427; --ink: #E6ECEC; --muted: #9DAEB1; --line: #2B393C;
  --accent: #5BB8C4; --accent-ink: #08191B; --accent-soft: #173539; --p: #E58B71;
  --ok: #6CC48C; --ok-soft: #16301F; --bad: #EE937A; --bad-soft: #3A211A; --sun: #E8B33A;
  --sh-or: #F6A23A; --sh-bl: #7FA6E8;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.5 var(--do);
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--accent); }
a { color: var(--accent); }
button, select, input { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */
.bar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: var(--accent); color: var(--accent-ink); }
.bar-in {
  max-width: 44rem; margin: 0 auto; display: flex; align-items: center; gap: 12px;
  padding-block: 10px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.brand { display: flex; align-items: baseline; gap: 6px; color: inherit; text-decoration: none; flex: none; }
.brand-name { font: 600 1.25rem/1 var(--read); letter-spacing: -0.01em; }
.brand-grade { font: 600 0.8rem/1 var(--do); background: var(--accent-ink); color: var(--accent); border-radius: 4px; padding: 3px 5px; }
.crumbs { flex: 1; min-width: 0; font-size: 0.875rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; opacity: 0.9; }
.crumbs a { color: inherit; }
.install { flex: none; background: var(--accent-ink); color: var(--accent); border: 0; border-radius: 999px; padding: 6px 14px; font-weight: 600; cursor: pointer; }

.wrap {
  max-width: 44rem; margin: 0 auto;
  padding-block: 20px 64px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.wrap:focus { outline: none; }

h1, h2, h3 { font-family: var(--read); font-weight: 600; text-wrap: balance; margin: 0; }
h1 { font-size: 1.75rem; line-height: 1.15; }
h2 { font-size: 1.25rem; line-height: 1.25; }
.eyebrow { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.lede { font-family: var(--read); color: var(--muted); margin: 6px 0 0; }
.stack { display: grid; gap: 16px; }

/* ---------- unit home ---------- */
.unit-head { display: grid; gap: 4px; margin-bottom: 20px; }
.unit-no { font: 600 3.5rem/0.9 var(--read); color: var(--accent); }
.tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.tile {
  display: grid; gap: 4px; align-content: start; min-height: 112px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 14px; color: var(--ink); text-decoration: none;
}
.tile:hover { border-color: var(--accent); }
.tile b { font: 600 1.1rem/1.2 var(--read); }
.tile span { font-size: 0.875rem; color: var(--muted); }
.tile .meter { margin-top: auto; }
.meter { height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--accent); }

.lessons { display: grid; gap: 0; margin-top: 24px; border-top: 1px solid var(--line); }
.lesson-row { display: grid; grid-template-columns: 2.5rem minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.lesson-row .no { font: 600 1.25rem/1 var(--read); color: var(--accent); font-variant-numeric: tabular-nums; }
.lesson-row .t { font-weight: 600; }
.lesson-row .s { font-size: 0.875rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.lesson-row.off { color: var(--muted); }
.lesson-row.off .no { color: var(--muted); }

/* ---------- tasks ---------- */
.task { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; display: grid; gap: 14px; }
.task-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; }
.task-no { font: 600 1rem/1 var(--do); background: var(--accent); color: var(--accent-ink); border-radius: 6px; padding: 5px 8px; font-variant-numeric: tabular-nums; }
.task-instr { font-family: var(--read); font-size: 1.05rem; line-height: 1.45; }
.task-sec { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; font-weight: 600; }
.task-body { font-family: var(--read); line-height: 1.7; min-width: 0; }
.task-body ol, .task-body ul { padding-left: 1.4em; margin: 0; display: grid; gap: 6px; }
.task-body blockquote { margin: 0; padding: 0; }
.task-body p { margin: 0 0 0.6em; }
.table-scroll { overflow-x: auto; }
.task-body table { border-collapse: collapse; font-family: var(--do); font-size: 0.9rem; min-width: 100%; }
.task-body th, .task-body td { border-bottom: 1px solid var(--line); padding: 6px 8px 6px 0; text-align: left; vertical-align: middle; }
.task-body th { font-weight: 600; color: var(--muted); font-size: 0.8rem; }

.gap { display: inline-block; position: relative; }
.gap input {
  width: 9.5em; max-width: 60vw; border: 0; border-bottom: 2px solid var(--accent); background: var(--accent-soft);
  border-radius: 4px 4px 0 0; padding: 1px 6px; font-family: var(--do); font-size: 0.95em; line-height: 1.5;
}
.ok input, input.ok, select.ok { border-color: var(--ok); background: var(--ok-soft); }
.bad input, input.bad, select.bad { border-color: var(--bad); background: var(--bad-soft); }

.rows { display: grid; gap: 10px; }
.row { display: grid; gap: 8px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); }
.row.ok { border-color: var(--ok); background: var(--ok-soft); }
.row.bad { border-color: var(--bad); background: var(--bad-soft); }
.row.empty { border-style: dashed; border-color: var(--muted); }
.empty input { border-bottom-style: dashed; border-bottom-color: var(--muted); }
.row-text { font-family: var(--read); }
.row-text .n { font-family: var(--do); font-weight: 600; color: var(--accent); margin-right: 6px; font-variant-numeric: tabular-nums; }
.row select { width: 100%; border: 1px solid var(--line); background: var(--card); border-radius: 6px; padding: 8px; font-family: var(--do); font-size: 0.95rem; }

.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button {
  border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 6px 14px; cursor: pointer;
  font-weight: 600; font-size: 0.9rem; min-height: 36px;
}
.seg button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.row.ok .seg button[aria-pressed="true"] { background: var(--ok); border-color: var(--ok); color: var(--card); }
.row.bad .seg button[aria-pressed="true"] { background: var(--bad); border-color: var(--bad); color: var(--card); }

.hint { font-size: 0.875rem; color: var(--bad); font-family: var(--do); }
.hint-inline { display: block; font-size: 0.8rem; color: var(--bad); line-height: 1.3; }
.task-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.score { margin-left: auto; font-weight: 600; font-variant-numeric: tabular-nums; }
.score.full { color: var(--ok); }

.btn { border: 1px solid var(--accent); background: var(--card); color: var(--accent); border-radius: 8px; padding: 8px 16px; font-weight: 600; cursor: pointer; min-height: 40px; }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.quiet { border-color: var(--line); color: var(--muted); }
.btn:disabled { opacity: 0.5; cursor: default; }

/* ---------- audio ---------- */
.player { display: grid; gap: 8px; background: var(--accent-soft); border-radius: 8px; padding: 10px 12px; }
.player-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.track-no { font: 600 1rem/1 var(--do); color: var(--accent); font-variant-numeric: tabular-nums; }
.player audio { width: 100%; height: 40px; }
.player .missing { font-size: 0.875rem; color: var(--muted); }
.speed { margin-left: auto; }
.speed button { padding: 4px 10px; min-height: 30px; font-size: 0.8rem; }
details.transcript { border-top: 1px solid var(--line); padding-top: 8px; }
details.transcript summary { cursor: pointer; font-weight: 600; color: var(--accent); }
.transcript-body { font-family: var(--read); line-height: 1.6; margin-top: 8px; }
.transcript-body p { margin: 0 0 0.7em; }
.transcript-body strong { font-family: var(--do); font-size: 0.8rem; letter-spacing: 0.04em; color: var(--muted); }

/* ---------- words ---------- */
.deck-stats { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.875rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.deck-stats b { color: var(--ink); }
.flash {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px 20px; min-height: 260px;
  display: grid; align-content: center; gap: 14px; text-align: center;
}
.flash .group { font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.flash .q { font: 400 1.35rem/1.35 var(--read); text-wrap: balance; }
.flash .a { font: 600 1.6rem/1.2 var(--read); color: var(--accent); text-wrap: balance; }
.flash .ex { font: italic 400 1.05rem/1.5 var(--read); color: var(--muted); }
.flash .lvl { font-size: 0.75rem; color: var(--muted); }
.flash-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.flash-actions .btn { min-height: 52px; font-size: 1rem; }
.btn.again { border-color: var(--bad); color: var(--bad); }
.btn.got { background: var(--ok); border-color: var(--ok); color: var(--card); }
.toggle { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- reference cards ---------- */
.cards { display: grid; grid-auto-flow: column; grid-auto-columns: min(86%, 22rem); gap: 12px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 12px; overscroll-behavior-x: contain; }
.pcard { scroll-snap-align: start; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; align-content: start; gap: 10px; min-height: 22rem; }
.pcard h2 { font-size: 1.15rem; color: var(--accent); }
.pcard.shelter { border-top: 6px solid var(--sh-or); }
.pcard.shelter h2 { color: var(--sh-bl); }
.pcard-body { font-family: var(--read); line-height: 1.55; }
.pcard-body p { margin: 0 0 0.5em; }
.cards-count { font-size: 0.875rem; color: var(--muted); }

.note { font-size: 0.875rem; color: var(--muted); }
.empty-state { padding: 24px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: var(--r); }

@media (min-width: 40rem) {
  .tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .row.inline { grid-template-columns: minmax(0, 1fr) auto; align-items: center; }
}
@media (prefers-reduced-motion: no-preference) {
  .flash { transition: transform 0.15s ease; }
  .flash.flip { transform: scale(0.98); }
}

/* ---------- board mode: large type, taps instead of typing, readable from the back row ---------- */
.board-link { display: grid; gap: 2px; margin-top: 12px; padding: 14px; border-radius: var(--r); border: 1px dashed var(--accent); color: var(--ink); text-decoration: none; }
.board-link b { font: 600 1.05rem/1.2 var(--read); color: var(--accent); }
.board-link span { font-size: 0.875rem; color: var(--muted); }

body.board .wrap, body.board .bar-in { max-width: 120rem; }
body.board { font-size: clamp(18px, 1.6vw, 30px); }
.b-layout { display: grid; gap: 24px; }
@media (min-width: 60rem) { .b-layout { grid-template-columns: minmax(0, 1fr) 15em; align-items: start; } .b-side { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 80px); } }
.b-main { display: grid; gap: 20px; min-width: 0; }
.b-stage { display: grid; gap: 16px; }
.b-instr { font: 600 1.4em/1.3 var(--read); text-wrap: balance; }
.b-instr .task-no { font-size: 0.7em; vertical-align: 0.15em; }
.b-body, .b-lead, .b-list { font: 400 1.25em/1.9 var(--read); }
.b-body p, .b-lead { margin: 0 0 0.5em; }
.b-cats { font-family: var(--do); font-weight: 600; color: var(--accent); }
.b-body ol { padding-left: 1.4em; margin: 0; }
.b-body blockquote { margin: 0; }
.b-body table { border-collapse: collapse; font-family: var(--do); }
.b-body th, .b-body td { border-bottom: 1px solid var(--line); padding: 0.3em 0.8em 0.3em 0; text-align: left; }
.b-list { padding: 0; margin: 0; list-style: none; display: grid; gap: 0.35em; }
.b-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 0.3em 0.6em; }
.b-list .n { font-family: var(--do); font-weight: 600; color: var(--accent); }
.b-match { display: grid; gap: 1em 2em; }
@media (min-width: 50rem) { .b-match { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); } }
.b-opts { font-size: 1.05em; line-height: 1.5; color: var(--muted); gap: 0.5em; }
.b-opts li { display: block; }
.b-gap, .b-ans {
  font: 600 0.9em/1.3 var(--do); border: 2px dashed var(--accent); background: var(--accent-soft); color: var(--accent);
  border-radius: 6px; padding: 0.05em 0.6em; min-width: 3.2em; cursor: pointer; text-align: center;
}
.b-gap.open, .b-ans.open { border-style: solid; border-color: var(--ok); background: var(--ok-soft); color: var(--ok); }
.b-nav { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.b-nav .btn { text-decoration: none; font-size: 0.8em; }
.b-nav .btn[aria-disabled="true"] { opacity: 0.4; pointer-events: none; }
.b-nav select { font-size: 0.8em; padding: 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); }
.b-side { display: grid; gap: 20px; font-size: 0.8em; }
.b-timer { display: grid; gap: 8px; justify-items: start; }
.b-clock { font: 600 3.2em/1 var(--do); font-variant-numeric: tabular-nums; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 0.15em 0.4em; cursor: pointer; color: var(--ink); }
.b-clock.low { color: var(--bad); }
.b-clock.done { background: var(--bad); color: var(--card); }
.b-scores { display: grid; gap: 8px; }
.b-team { display: grid; grid-template-columns: minmax(0, 1fr) auto 2.2em auto; align-items: center; gap: 8px; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 6px 10px; }
.b-tname { font-weight: 600; }
.b-score { font: 600 1.6em/1 var(--do); text-align: center; font-variant-numeric: tabular-nums; }
.b-pm { width: 2.2em; height: 2.2em; border-radius: 50%; border: 1px solid var(--accent); background: var(--card); color: var(--accent); font-weight: 600; cursor: pointer; }
.b-word { display: grid; gap: 0.6em; place-items: center; text-align: center; min-height: 10em; padding: 1em; background: var(--card); border: 1px solid var(--line); border-radius: 16px; cursor: pointer; color: var(--ink); font: inherit; }
.b-wq { font: 400 1.6em/1.3 var(--read); text-wrap: balance; }
.b-wa { font: 600 2.2em/1.1 var(--read); color: var(--accent); }
.b-wh { font-size: 0.8em; color: var(--muted); }

/* ---------- reset and update ---------- */
.reset { display: grid; gap: 8px; margin-top: 24px; }
.reset .note { margin: 0; }
.update {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; justify-content: center;
  background: var(--ink); color: var(--paper); font-weight: 600;
  padding-block: 12px calc(12px + env(safe-area-inset-bottom, 0px));
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* ---------- task image with letters ---------- */
.pic { position: relative; margin: 0; max-width: 100%; border-radius: 8px; overflow: hidden; background: var(--line); }
.pic img { display: block; width: 100%; height: 100%; object-fit: cover; }
.spot {
  position: absolute; transform: translate(-50%, -50%); min-width: 1.9em; height: 1.9em; padding: 0 0.3em;
  display: grid; place-items: center; border-radius: 999px; background: #1E2A2E; color: #FFFFFF;
  font: 600 clamp(11px, 2.6vw, 0.8em)/1 var(--do); box-shadow: 0 0 0 2px #FFFFFF;
}
.before { margin: 0; font-family: var(--read); font-style: italic; color: var(--muted); }
.b-pic { display: grid; gap: 1em 2em; }
@media (min-width: 50rem) { .b-pic { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; } }

/* ---------- locked transcript ---------- */
.locked { border-top: 1px solid var(--line); padding-top: 8px; font-size: 0.875rem; color: var(--muted); }
.locked-t { display: block; font-weight: 600; color: var(--ink); }

/* ---------- reading text, task timer ---------- */
.task-tools { display: flex; flex-wrap: wrap; gap: 8px; }
.timer { font-variant-numeric: tabular-nums; }
.timer.done { border-color: var(--bad); color: var(--bad); }
.gap input.short { width: 3.5em; text-align: center; }
.abc { list-style: none; padding: 0; margin: 0 0 4px; display: grid; gap: 6px; }
.abc b { font-family: var(--do); color: var(--accent); margin-right: 4px; }
dialog.reading {
  width: min(44rem, 100%); max-width: 100%; height: 100%; max-height: 100%; margin: 0 auto; border: 0; padding: 0;
  background: var(--paper); color: var(--ink);
}
dialog.reading::backdrop { background: rgba(0, 0, 0, 0.4); }
.reading-bar {
  position: sticky; top: 0; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--paper); border-bottom: 1px solid var(--line);
  padding-block: calc(10px + env(safe-area-inset-top, 0px)) 10px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
dialog.reading h2, .reading-body { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
dialog.reading h2 { padding-block: 16px 4px; font-size: 1.4em; }
.reading-body { font-family: var(--read); font-size: 1.05em; line-height: 1.65; padding-bottom: 48px; }
.reading-body p { margin: 0 0 0.9em; }
.reading-body strong { font-family: var(--do); color: var(--accent); font-size: 0.85em; }

/* ---------- choice in the sentence, dropdown gap ---------- */
.row-text.pick .seg { display: inline-flex; vertical-align: middle; margin: 2px 2px; gap: 4px; }
.row-text.pick .seg button { min-height: 32px; padding: 3px 10px; font-weight: 500; }
.gap select { border: 0; border-bottom: 2px solid var(--accent); background: var(--accent-soft); border-radius: 4px 4px 0 0; padding: 1px 4px; font-family: var(--do); font-size: 0.95em; }
.ok select { border-color: var(--ok); background: var(--ok-soft); }
.bad select { border-color: var(--bad); background: var(--bad-soft); }
.empty select { border-bottom-style: dashed; border-bottom-color: var(--muted); }

/* "Why?": explanations after Check */
.explain { margin: 0.5rem 0 0; padding: 0.5rem 0.75rem; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 6px 6px 0; font-size: 0.9rem; }
.explain summary { cursor: pointer; font-family: var(--do); font-weight: 600; }
.explain ul { margin: 0.4rem 0 0; padding-left: 1.1rem; }
.explain li, .explain p { margin: 0.2rem 0; font-family: var(--read); }
.explain li b { font-family: var(--do); margin-right: 0.3rem; }
.b-explain { font-size: 1.1rem; margin-top: 1rem; }