/* Earmark — notebook paper, blue-black ink, a teacher's red pen, a highlighter for expressions. */
:root {
  --paper: #F6F7F9;
  --sheet: #FFFFFF;
  --ink: #1B2A4A;
  --ink-2: #4A5874;
  --muted: #6B7790;
  --line: #E1E6EF;
  --rule: #D6E0EF;
  --rule-strong: #9FB3D3;
  --margin: #F1B9C2;
  --redpen: #D7263D;
  --marker: #FFEE70;
  --marker-ink: #1B2A4A;
  --tape: #E9EDF4;
  --tape-stripe: #DCE3EE;
  --focus: #3D7BFF;
  --ok: #1B2A4A;
  --src-ted: #9B2C3A; --src-bbc: #6B4FA0; --src-tablo: #2F7D6D; --src-elllo: #B06A12; --src-voa: #2D5FA8; --src-other: #6B7790;
  --radius: 10px;
  --lh: 2.15rem;
  --font-ui: 'IBM Plex Sans KR', system-ui, -apple-system, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --font-en: 'Literata', 'IBM Plex Sans KR', Georgia, serif;
  --font-pen: 'Caveat', 'Segoe Print', cursive;
  --topbar: 56px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121A2C; --sheet: #18233A; --ink: #E4EAF4; --ink-2: #B9C4D8; --muted: #8C99B2; --line: #24314B;
    --rule: #26344F; --rule-strong: #3B4D70; --margin: #5A2F3E; --redpen: #FF6B7D; --marker: #8A7A12; --marker-ink: #FFF6C2;
    --tape: #22304A; --tape-stripe: #2A3956; --focus: #7FA6FF;
    --src-ted: #F08A97; --src-bbc: #B9A2E8; --src-tablo: #7DD3BF; --src-elllo: #F0B45E; --src-voa: #8DB4F2; --src-other: #8C99B2;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121A2C; --sheet: #18233A; --ink: #E4EAF4; --ink-2: #B9C4D8; --muted: #8C99B2; --line: #24314B;
  --rule: #26344F; --rule-strong: #3B4D70; --margin: #5A2F3E; --redpen: #FF6B7D; --marker: #8A7A12; --marker-ink: #FFF6C2;
  --tape: #22304A; --tape-stripe: #2A3956; --focus: #7FA6FF;
  --src-ted: #F08A97; --src-bbc: #B9A2E8; --src-tablo: #7DD3BF; --src-elllo: #F0B45E; --src-voa: #8DB4F2; --src-other: #8C99B2;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 16px/1.6 var(--font-ui); letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
[hidden] { display: none !important; }
h1, h2, h3 { line-height: 1.25; margin: 0; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; z-index: 99; background: var(--sheet); padding: 8px 12px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.error { color: var(--redpen); }
.loading { padding: 48px 16px; text-align: center; color: var(--muted); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; height: var(--topbar);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 0 max(16px, env(safe-area-inset-left)); background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 600 1.15rem var(--font-en); letter-spacing: -0.01em; }
.nav { display: flex; gap: 4px; }
.nav a { text-decoration: none; padding: 8px 12px; border-radius: 8px; color: var(--ink-2); font-weight: 500; position: relative; }
.nav a[aria-current="page"] { color: var(--ink); background: var(--sheet); box-shadow: inset 0 -2px 0 var(--ink); }
.due-badge { display: inline-block; min-width: 18px; padding: 0 5px; border-radius: 9px; background: var(--redpen); color: #fff; font-size: .72rem; line-height: 18px; text-align: center; margin-left: 2px; }

main { max-width: 1240px; margin: 0 auto; padding: 24px 16px 96px; }

/* ---------- buttons, fields ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 42px;
  padding: 8px 16px; border-radius: var(--radius); border: 1.5px solid var(--rule-strong);
  background: var(--sheet); color: var(--ink); text-decoration: none; font-weight: 500; white-space: nowrap;
}
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.primary:hover { filter: brightness(1.12); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.wide { width: 100%; margin-top: 8px; }
.btn small { font-weight: 400; opacity: .75; margin-left: 4px; max-width: 18ch; overflow: hidden; text-overflow: ellipsis; }
.btn.rec.on { background: var(--redpen); border-color: var(--redpen); color: #fff; }
.chip {
  border: 1px solid var(--line); background: var(--sheet); border-radius: 999px; padding: 5px 12px; font-size: .88rem; color: var(--ink-2);
}
.chip[aria-selected="true"] { border-color: var(--ink); color: var(--ink); font-weight: 600; }
.icon-btn { border: 0; background: none; width: 36px; height: 36px; border-radius: 8px; font-size: 1rem; color: var(--ink-2); }
.icon-btn:hover { background: var(--tape); }
.link-btn { border: 0; background: none; padding: 0; color: var(--muted); text-decoration: underline; font-size: .85rem; }
.field {
  width: 100%; padding: 10px 12px; border-radius: var(--radius); border: 1.5px solid var(--rule); background: var(--sheet);
  min-height: 44px;
}
.field:focus { border-color: var(--ink); outline: none; }
.field.small { min-height: 36px; padding: 6px 10px; font-size: .9rem; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
.lbl { display: grid; gap: 6px; font-weight: 500; font-size: .92rem; margin: 14px 0 0; }
.check { display: flex; gap: 8px; align-items: center; margin: 12px 0; }
.check input { width: 18px; height: 18px; accent-color: var(--ink); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ---------- source identity ---------- */
.src { font-weight: 600; text-decoration: none; }
.src-ted { color: var(--src-ted); } .src-bbc { color: var(--src-bbc); } .src-tablo { color: var(--src-tablo); }
.src-elllo { color: var(--src-elllo); } .src-voa { color: var(--src-voa); } .src-other { color: var(--src-other); }
.meta { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 4px 0 0; font-size: .85rem; color: var(--muted); align-items: center; }

/* ---------- home ---------- */
.today { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; padding: 8px 0 20px; }
.today h1 { font: 600 clamp(1.7rem, 4vw, 2.4rem)/1.15 var(--font-en); letter-spacing: -0.02em; }
.today-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.filters { display: flex; gap: 6px; overflow-x: auto; padding: 4px 0 12px; scrollbar-width: none; }
.filters::-webkit-scrollbar { display: none; }
.filters .chip { flex: none; }
.about { color: var(--ink-2); margin: 0 0 12px; font-size: .95rem; }
.library { border-top: 1px solid var(--rule); }
.lesson-item {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px 24px; align-items: center;
  padding: 16px 0 16px 16px; border-bottom: 1px solid var(--rule); position: relative;
}
.lesson-item::before { content: ''; position: absolute; left: 0; top: 16px; bottom: 16px; width: 3px; border-radius: 2px; background: var(--src-other); }
.src-line-ted::before { background: var(--src-ted); } .src-line-bbc::before { background: var(--src-bbc); }
.src-line-tablo::before { background: var(--src-tablo); } .src-line-elllo::before { background: var(--src-elllo); }
.src-line-voa::before { background: var(--src-voa); }
.li-title { font: 500 1.12rem/1.35 var(--font-en); text-decoration: none; }
.li-title:hover { text-decoration: underline; text-underline-offset: 3px; }
.li-parts { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; max-width: 360px; }
.part {
  min-width: 38px; height: 38px; display: inline-grid; place-items: center; padding: 0 10px; border-radius: 8px;
  border: 1.5px solid var(--rule-strong); text-decoration: none; font-weight: 600; font-size: .9rem;
  background: linear-gradient(to top, var(--marker) var(--p, 0%), var(--sheet) var(--p, 0%));
}
.part:hover { border-color: var(--ink); }
.part.full { border-color: var(--ink); }
.empty { padding: 40px 0; text-align: center; display: grid; gap: 12px; justify-items: center; }

/* ---------- lesson ---------- */
.lesson-head { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 8px 16px; align-items: center; margin-bottom: 16px; }
.back { text-decoration: none; color: var(--ink-2); font-weight: 500; padding: 6px 8px 6px 0; }
.lesson-title h1 { font: 600 1.25rem/1.3 var(--font-en); letter-spacing: -0.01em; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.modes { display: inline-flex; border: 1.5px solid var(--rule-strong); border-radius: var(--radius); overflow: hidden; background: var(--sheet); }
.modes button { border: 0; background: none; padding: 8px 14px; min-height: 40px; color: var(--ink-2); font-weight: 500; }
.modes button + button { border-left: 1px solid var(--rule); }
.modes button[aria-selected="true"] { background: var(--ink); color: var(--paper); }

.lesson-grid { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 24px; align-items: start; }
.stage { min-width: 0; }
.video-wrap { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius); overflow: hidden; }
.video-wrap.is-audio { aspect-ratio: auto; background: var(--sheet); border: 1px solid var(--line); padding: 12px; }
.video, .video iframe, .video video { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.is-audio .video { position: static; }
.is-audio .video audio, .is-audio .video video { position: static; width: 100%; height: auto; max-height: 280px; }
.audio-bar { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.audio-bar input { width: 100%; accent-color: var(--ink); height: 28px; }
.cover {
  position: absolute; left: 0; right: 0; bottom: 13%; height: 17%; pointer-events: none;
  background: rgba(18, 26, 44, .78); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  display: grid; place-items: center; color: rgba(255,255,255,.55); font-size: .78rem; letter-spacing: .02em;
}
.tbar { display: flex; align-items: center; gap: 12px; margin: 10px 0 6px; }
.counter { font-size: .85rem; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.bar { flex: 1; height: 4px; background: var(--rule); border-radius: 2px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--ink); transition: width .3s; }
.transport {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap; padding: 8px; background: var(--sheet);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.tbtn {
  min-width: 44px; height: 44px; border-radius: 9px; border: 1px solid transparent; background: none; font-size: 1.15rem; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.tbtn:hover { background: var(--tape); }
.tbtn.play { background: var(--ink); color: var(--paper); font-size: 1rem; }
.tbtn.replay { font-size: 1.3rem; }
.tbtn.small { font-size: .88rem; padding: 0 10px; border-color: var(--line); }
.tbtn:not(.step):not(.play):not(.replay):not(.small) { font-size: .88rem; padding: 0 10px; border-color: var(--line); }
.tsep { flex: 1; }
.list-toggle { display: none; }

/* the dictation sheet */
.sheet { margin-top: 16px; }
.paper {
  position: relative; background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 6px 16px 10px 48px;
  background-image: repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--lh) - 1px), var(--rule) calc(var(--lh) - 1px), var(--rule) var(--lh));
  background-position: 0 6px;
}
.paper::before { content: ''; position: absolute; top: 0; bottom: 0; left: 34px; width: 1.5px; background: var(--margin); }
.answer {
  width: 100%; border: 0; background: transparent; resize: vertical; min-height: calc(var(--lh) * 2);
  font: 400 1.25rem/var(--lh) var(--font-en); color: var(--ink); padding: 0; outline: none;
}
.hint-line { margin: 0; font: 400 1.05rem/var(--lh) var(--font-en); color: var(--muted); letter-spacing: .04em; min-height: 0; }
.hint-line:empty { display: none; }
.keys { font-size: .8rem; margin-top: 4px; }

.result { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 16px; align-items: start; margin-top: 16px; }
.score {
  width: 84px; height: 84px; border: 2.5px solid var(--redpen); border-radius: 50% 48% 52% 47%; transform: rotate(-7deg);
  display: grid; place-items: center; align-content: center; color: var(--redpen); font-family: var(--font-pen); text-align: center;
}
.score span { font-size: 2.3rem; line-height: .9; font-weight: 600; }
.score small { font: 500 .66rem/1.2 var(--font-ui); max-width: 70px; }
.graded { margin: 0; font: 400 1.25rem/2.9rem var(--font-en); padding-top: .4rem; }
.g-fix { display: inline-flex; flex-direction: column-reverse; align-items: center; vertical-align: bottom; line-height: 1.1; position: relative; }
.g-fix .pen { font: 600 1.35rem/1 var(--font-pen); color: var(--redpen); transform: rotate(-2deg); white-space: nowrap; }
.g-fix s { text-decoration-color: var(--redpen); text-decoration-thickness: 2px; color: var(--muted); }
.g-near s { text-decoration: underline wavy var(--redpen); text-underline-offset: 4px; }
.g-missing .caret { color: var(--redpen); font: 600 1.4rem/1 var(--font-pen); }
.g-extra { text-decoration: line-through 2px var(--redpen); color: var(--muted); }

/* EN / KO pair with blinds */
.pair { padding: 10px 0; }
.pair .en { margin: 0; font: 400 1.1rem/1.6 var(--font-en); color: var(--ink); }
.pair .ko { margin: 4px 0 0; font-size: .93rem; color: var(--ink-2); }
.pair.big .en { font-size: 1.35rem; line-height: 1.55; }
.pair.big .ko { font-size: 1rem; }
.sheet > .pair { border-top: 1px dashed var(--rule-strong); margin-top: 8px; padding-top: 16px; }
.blind {
  color: transparent !important; cursor: pointer; user-select: none; -webkit-user-select: none; border-radius: 3px;
  background: repeating-linear-gradient(-45deg, var(--tape), var(--tape) 6px, var(--tape-stripe) 6px, var(--tape-stripe) 12px);
  -webkit-box-decoration-break: clone; box-decoration-break: clone; width: fit-content; max-width: 100%;
  word-break: break-all; letter-spacing: -0.05em;
}
.blind:hover { outline: 1px solid var(--rule-strong); }
.en .w { cursor: pointer; border-radius: 3px; }
.en .w:hover { background: var(--tape); }
.en .w.mark, mark { background: linear-gradient(transparent 52%, var(--marker) 52%, var(--marker) 92%, transparent 92%); color: inherit; }
.en .w.sel { background: var(--marker); color: var(--marker-ink); }

.study-notes { border-top: 1px solid var(--line); margin-top: 12px; padding-top: 12px; }
.study-notes h3 { font-size: .9rem; color: var(--ink-2); margin: 10px 0 6px; font-weight: 600; }
.exp-list, .cs-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.exp-list li { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 4px 12px; align-items: baseline; padding: 6px 0; border-bottom: 1px solid var(--line); }
.exp-p { font: 500 1.02rem var(--font-en); background: linear-gradient(transparent 55%, var(--marker) 55%, var(--marker) 92%, transparent 92%); }
.exp-ko { color: var(--ink-2); font-size: .92rem; }
.exp-t { font-size: .75rem; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0 8px; white-space: nowrap; }
.save { border: 1px solid var(--rule-strong); background: var(--sheet); border-radius: 8px; padding: 3px 10px; font-size: .82rem; }
.save.saved { border-color: transparent; color: var(--muted); }
.cs-list li { font-size: .92rem; color: var(--ink-2); }
.cs-list strong { font: 500 .95rem var(--font-en); color: var(--ink); }
.tip { font-size: .8rem; margin-top: 10px; }

.cloze { margin: 0; font: 400 1.25rem/var(--lh) var(--font-en); }
.blank {
  border: 0; border-bottom: 2px solid var(--ink); background: transparent; font: inherit; text-align: center;
  padding: 0 2px; margin: 0 2px; min-width: 3ch; outline: none; color: var(--ink);
}
.blank:focus { border-bottom-color: var(--focus); background: var(--tape); }
.blank.ok { border-bottom-color: var(--ink); color: var(--ink); }
.blank.bad { color: var(--muted); text-decoration: line-through 2px var(--redpen); border-bottom-color: var(--redpen); }
.cloze .pen { font: 600 1.3rem var(--font-pen); color: var(--redpen); margin-right: 4px; }
.sync-status { padding: 14px; background: var(--sheet); border: 1px dashed var(--rule-strong); border-radius: var(--radius); }

/* side: chunk list */
.side {
  position: sticky; top: calc(var(--topbar) + 12px); max-height: calc(100vh - var(--topbar) - 24px);
  display: flex; flex-direction: column; background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.list-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.list-head strong { margin-right: auto; }
.gran { font-size: .85rem; color: var(--muted); }
.gran select { border: 1px solid var(--line); border-radius: 6px; background: var(--sheet); padding: 3px 6px; }
.close-list { display: none; }
.chunk-list { overflow-y: auto; overscroll-behavior: contain; flex: 1; }
.row-c { display: grid; grid-template-columns: 32px minmax(0, 1fr) 30px; gap: 8px; padding: 8px 12px 8px 8px; border-bottom: 1px solid var(--line); cursor: pointer; border-left: 3px solid transparent; }
.row-c:hover { background: var(--paper); }
.row-c.cur { border-left-color: var(--ink); background: var(--paper); }
.row-c .num { font-size: .78rem; color: var(--muted); text-align: right; padding-top: 4px; font-variant-numeric: tabular-nums; }
.row-c.done .num { color: var(--ink); font-weight: 600; }
.row-c .pair { padding: 0; }
.row-c .pair .en { font-size: .95rem; line-height: 1.5; }
.row-c .pair .ko { font-size: .82rem; margin-top: 2px; }
.row-c .best { font: 600 1.05rem var(--font-pen); color: var(--redpen); text-align: center; padding-top: 2px; }
.parts { display: flex; flex-wrap: wrap; gap: 4px; padding: 10px 12px; border-top: 1px solid var(--line); }
.parts a { min-width: 32px; height: 32px; display: grid; place-items: center; border-radius: 6px; border: 1px solid var(--line); text-decoration: none; font-size: .85rem; }
.parts a.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- pages ---------- */
.page-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
.page-head h1 { font: 600 1.7rem var(--font-en); letter-spacing: -0.015em; }
.add-form { max-width: 720px; }
.script { font: 400 .95rem/1.55 var(--font-en); min-height: 220px; resize: vertical; }
.detect { font-size: .88rem; margin: 6px 0 0; }
.detect.ok { color: var(--src-tablo); }
.detect.warn { color: var(--src-elllo); }
.yt-preview { display: flex; gap: 12px; align-items: center; margin-top: 8px; color: var(--muted); font-size: .9rem; }
.yt-preview img { width: 160px; border-radius: 8px; aspect-ratio: 16/9; object-fit: cover; }
.or { margin: 10px 0 0; color: var(--muted); font-size: .9rem; }
.howto { margin: 14px 0; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; background: var(--sheet); max-width: 720px; }
.howto summary { cursor: pointer; font-weight: 500; }
.howto ol { padding-left: 20px; color: var(--ink-2); font-size: .92rem; }
.howto pre { background: var(--paper); padding: 10px 12px; border-radius: 8px; overflow-x: auto; font-size: .85rem; }
.howto.tool { margin-top: 28px; }

.notes { display: grid; gap: 0; border-top: 1px solid var(--rule); }
.note { padding: 14px 0; border-bottom: 1px solid var(--rule); display: grid; gap: 6px; }
.n-top { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: baseline; }
.n-text { font: 600 1.15rem var(--font-en); }
.n-ko { color: var(--ink-2); }
.n-sent { margin: 0; font: 400 1rem/1.55 var(--font-en); color: var(--ink-2); }
.n-sko { margin: 0; font-size: .88rem; color: var(--muted); }
.n-foot { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-size: .85rem; }
.missed { margin-top: 32px; }
.missed h2 { font: 600 1.2rem var(--font-en); }
.missed-words { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.missed-words a { font: 400 1rem var(--font-en); text-decoration: none; border: 1px solid var(--line); background: var(--sheet); border-radius: 6px; padding: 3px 9px; }
.missed-words small { font: 600 .9rem var(--font-pen); color: var(--redpen); margin-left: 6px; }

.review-player { max-width: 640px; margin: 0 auto 12px; }
.review-player.on { aspect-ratio: 16 / 9; position: relative; border-radius: var(--radius); overflow: hidden; background: #000; }
.review-player.on:has(audio) { aspect-ratio: auto; background: var(--sheet); border: 1px solid var(--line); padding: 10px 14px; }
.review-player.on:has(audio) .video { position: static; }
.review-player.on .video, .review-player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.review-player audio { width: 100%; }
.review-card { max-width: 640px; margin: 0 auto; background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.r-sent { font: 400 1.3rem/1.6 var(--font-en); margin: 8px 0; }
.r-blank { color: var(--redpen); letter-spacing: .1em; }
.r-text { font: 600 1.4rem var(--font-en); margin: 12px 0 2px; }
.r-ko { margin: 0 0 6px; color: var(--ink-2); }
.grades .btn { flex: 1; }
.big-num { font: 600 3.4rem/1 var(--font-pen); color: var(--redpen); margin: 0; }

.set-group { max-width: 720px; padding: 18px 0; border-bottom: 1px solid var(--rule); }
.set-group h2 { font: 600 1.15rem var(--font-en); margin-bottom: 4px; }
.set-group .lbl { max-width: 360px; }
.keys-table { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 10px 0 0; }
.keys-table dt { font-weight: 600; font-size: .88rem; }
.keys-table dd { margin: 0; color: var(--ink-2); font-size: .92rem; }

/* ---------- modal + toast ---------- */
.modal { position: fixed; inset: 0; z-index: 60; background: rgba(10, 16, 30, .45); display: grid; place-items: center; padding: 16px; }
.modal-card { width: min(480px, 100%); max-height: 86vh; overflow: auto; background: var(--sheet); border-radius: 14px; padding: 16px 18px 20px; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.lookup-q { font: 600 1.4rem var(--font-en); margin: 0 0 6px; }
.defs p { margin: 4px 0; font-size: .92rem; color: var(--ink-2); }
.defs .tr { color: var(--ink); font-weight: 500; }
.defs .ex { color: var(--muted); font-style: italic; }
.links { display: flex; gap: 14px; flex-wrap: wrap; margin: 10px 0 12px; font-size: .9rem; }
.lookup .field { margin-bottom: 12px; }
.nudge-val { font: 500 1.1rem var(--font-en); font-variant-numeric: tabular-nums; margin: 0 0 10px; }
.nudge-grid { display: grid; grid-template-columns: auto 1fr 1fr; gap: 8px; align-items: center; margin-bottom: 10px; }
.finish { text-align: center; display: grid; gap: 10px; justify-items: center; }
#toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); transform: translate(-50%, 20px); opacity: 0;
  background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 10px; z-index: 80; font-size: .92rem;
  transition: opacity .2s, transform .2s; pointer-events: none; max-width: calc(100vw - 32px); text-align: center;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- tablet / phone ---------- */
@media (max-width: 1023px) {
  .lesson-grid { grid-template-columns: minmax(0, 1fr); }
  .side {
    position: fixed; left: 0; right: 0; bottom: 0; top: auto; z-index: 40; max-height: 72vh; height: 72vh;
    border-radius: 16px 16px 0 0; transform: translateY(105%); transition: transform .25s ease; box-shadow: 0 -10px 40px rgba(0,0,0,.2);
  }
  body.list-open .side { transform: none; }
  .close-list { display: inline-block; }
  .list-toggle { display: inline-flex; align-items: center; }
}
@media (max-width: 767px) {
  main { padding: 16px 16px calc(84px + env(safe-area-inset-bottom)); }
  .topbar { height: 50px; }
  .nav {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; justify-content: space-around; gap: 0;
    background: var(--sheet); border-top: 1px solid var(--line); padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
  }
  .nav a { flex: 1; text-align: center; padding: 10px 4px; font-size: .9rem; }
  .nav a[aria-current="page"] { box-shadow: inset 0 2px 0 var(--ink); background: none; }
  body.in-lesson .topbar { display: none; }
  body.in-lesson main { padding: 0 0 calc(76px + env(safe-area-inset-bottom)); }
  .lesson-head { grid-template-columns: auto minmax(0, 1fr); padding: 8px 16px 0; margin-bottom: 8px; }
  .lesson-head .modes { grid-column: 1 / -1; width: 100%; }
  .modes button { flex: 1; padding: 8px 6px; }
  .lesson-title h1 { font-size: 1.05rem; -webkit-line-clamp: 1; }
  .lesson-title .meta { font-size: .78rem; gap: 2px 10px; }
  .video-wrap { position: sticky; top: 0; z-index: 10; border-radius: 0; }
  .video-wrap.is-audio { position: static; border-radius: 0; border-width: 1px 0; }
  .tbar, .sheet { padding: 0 16px; }
  .transport {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; border-radius: 0; border-width: 1px 0 0; flex-wrap: nowrap;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom)); overflow-x: auto; justify-content: space-between; gap: 2px;
  }
  .tsep { display: none; }
  .tbtn { min-width: 38px; flex: none; }
  .tbtn.small, .tbtn:not(.step):not(.play):not(.replay):not(.small) { padding: 0 7px; font-size: .8rem; }
  .paper { padding-left: 36px; }
  .paper::before { left: 24px; }
  .answer, .cloze, .graded { font-size: 1.12rem; }
  .result { grid-template-columns: 1fr; }
  .score { width: 72px; height: 72px; }
  .lesson-item { grid-template-columns: minmax(0, 1fr); }
  .li-parts { justify-content: flex-start; max-width: none; }
  .grid2 { grid-template-columns: 1fr; gap: 0; }
  .exp-list li { grid-template-columns: minmax(0, 1fr) auto; }
  .exp-list .exp-ko { grid-column: 1 / -1; grid-row: 2; }
  .exp-list .exp-t { display: none; }
  .modal { place-items: end center; padding: 0; }
  .modal-card { border-radius: 16px 16px 0 0; width: 100%; padding-bottom: calc(20px + env(safe-area-inset-bottom)); }
  .today-actions { width: 100%; }
  .today-actions .btn { flex: 1; }
  #toast { bottom: calc(90px + env(safe-area-inset-bottom)); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}