:root {
  --bg: #11161d;
  --panel: #171e27;
  --line: #232d3a;
  --ink: #e8eef6;
  --dim: #8b9bb0;
  --accent: #5bb0ff;
  --hot: #ffd166;
  --good: #6fcf97;
  --again: #eb5757;
  --safe: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--ink);
  font: 17px/1.65 system-ui, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  display: flex; flex-direction: column;
}
button { font-family: inherit; }
[hidden] { display: none !important; }

#appshell { display: flex; flex-direction: column; flex: 1; min-height: 0; }

/* ---------- home: hero + lesson list ---------- */
#home { display: flex; flex-direction: column; flex: 1; }
#herowrap { position: relative; width: 100%; aspect-ratio: 16 / 9; overflow: hidden; }
#herobanner { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: top; }
#herofade { position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(17,22,29,0) 45%, var(--bg) 100%); }
#herotitle { position: absolute; left: 16px; bottom: 14px; z-index: 1;
  font-size: 22px; font-weight: 700; color: var(--ink);
  text-shadow: 0 2px 10px rgba(0,0,0,.6); }
#lessonlist { padding: 14px 12px calc(20px + var(--safe)); }
.lesson { display: flex; align-items: center; gap: 12px; cursor: pointer;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px; transition: border-color .12s, background .12s; }
.lesson:hover { border-color: var(--accent); background: #1a2330; }
.lessonthumb { flex: none; width: 84px; aspect-ratio: 16/9; border-radius: 8px;
  overflow: hidden; background: #000; }
.lessonthumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.lessonbody { flex: 1; min-width: 0; }
.lessontitle { font-size: 15px; font-weight: 600; color: var(--ink); }
.lessonsub { font-size: 12px; color: var(--dim); margin-top: 3px; }
.lessongo { flex: none; width: 40px; height: 40px; border-radius: 50%; cursor: pointer;
  background: var(--accent); color: #07121f; border: 0; font-size: 14px; }

/* ---------- header / player ---------- */
#top { position: sticky; top: 0; z-index: 5; background: var(--bg); }
.bar { display: flex; gap: 8px; padding: 8px 10px; }
#songtitle { flex: 1; padding: 9px 2px; font-size: 15px; font-weight: 600; color: var(--ink); }
#stage { position: relative; width: 100%; aspect-ratio: 16 / 9; max-height: 60vh; background: #000; }
#stage iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

#speedbar { display: flex; align-items: center; gap: 8px; padding: 6px 10px 0; }
.slab { font-size: 13px; line-height: 1; opacity: .75; }
#speed { flex: 1; min-width: 0; -webkit-appearance: none; appearance: none;
  height: 22px; background: transparent; cursor: pointer; }
#speed::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--line); }
#speed::-moz-range-track { height: 4px; border-radius: 2px; background: var(--line); }
#speed::-webkit-slider-thumb { -webkit-appearance: none; appearance: none;
  width: 22px; height: 22px; margin-top: -9px; border-radius: 50%;
  background: var(--accent); border: 0; cursor: pointer; }
#speed::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%;
  background: var(--accent); border: 0; cursor: pointer; }
#speedval { min-width: 38px; text-align: right; font-size: 12px; color: var(--accent);
  font-variant-numeric: tabular-nums; }

/* ---------- tabs ---------- */
#tabs { display: flex; gap: 6px; padding: 8px 10px; background: var(--bg);
        position: sticky; top: 0; z-index: 4; border-bottom: 1px solid var(--line); }
.tab { flex: 1; padding: 9px 0; border-radius: 9px; cursor: pointer;
  background: var(--panel); color: var(--dim);
  border: 1px solid var(--line); font-size: 15px; font-weight: 600; }
.tab.on { background: var(--accent); color: #07121f; border-color: var(--accent); }

/* ---------- views ---------- */
main { flex: 1; overflow: hidden; display: flex; }
.view { display: none; flex: 1; min-width: 0; overflow-y: auto;
        padding: 10px 10px calc(80px + var(--safe)); }
.view.on { display: block; }
.hint { color: var(--dim); font-size: 13px; margin: 2px 4px 10px; }

.play { flex: none; width: 34px; height: 34px; border-radius: 50%; cursor: pointer;
  background: transparent; color: var(--accent);
  border: 1px solid var(--line); font-size: 12px; line-height: 1; padding: 0; }
.play:hover { background: #223145; border-color: var(--accent); }

/* ---------- 읽기 : one line, words on demand ---------- */
#pager { display: flex; align-items: center; gap: 8px; margin: 12px 0 0; }
#pager button { width: 54px; height: 40px; border-radius: 10px; cursor: pointer;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); font-size: 24px; line-height: 1; }
#pager button:disabled { opacity: .3; cursor: default; }
#pos { flex: 1; text-align: center; color: var(--dim); font-size: 13px;
       font-variant-numeric: tabular-nums; }

#subcard { display: flex; align-items: flex-start; gap: 10px;
           background: var(--panel); border: 1px solid var(--line);
           border-radius: 12px; padding: 13px; }
#subcard .play { margin-top: 4px; }
#subtext { flex: 1; font-size: 22px; line-height: 1.65; }
#subtext.long { font-size: 19px; line-height: 1.55; }
.tok { display: inline-block; padding: 0 3px; margin: 0 1px; border-radius: 6px;
  cursor: pointer; border-bottom: 2px solid var(--line); }
.tok:hover { background: #223145; }
.tok.known { border-bottom-color: var(--good); }
.tok.open { background: #2a2418; border-bottom-color: var(--hot); }
.punc { color: var(--dim); }

/* Romanization sits directly under the Korean line -- always visible, not
   gated behind a tap, since that's the point of the app. */
#subroman { color: var(--accent); font-size: 14px; margin: 6px 4px 0; letter-spacing: .2px; }

#subtrans:not(:empty) { color: var(--dim); font-size: 14px; margin: 9px 4px 0;
  cursor: pointer; border-radius: 7px; padding: 3px 6px; }
#subtrans.covered { color: #4a5a70; background: var(--panel);
  border: 1px dashed var(--line); font-style: italic; }
#subwords:not(:empty) { margin-top: 10px; }

.wrow { display: flex; align-items: center; gap: 10px;
  padding: 9px 11px; border-radius: 10px;
  background: var(--panel); border: 1px solid var(--hot); cursor: pointer; }
.wmain { flex: 1; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.wmain .w   { font-size: 21px; }
.wmain .roman { color: var(--accent); font-size: 13px; }
.wmain .en  { color: var(--dim); font-size: 13px; flex: 1; min-width: 8em; }
.wmain .lem { color: var(--hot); font-size: 12px; }
.add { flex: none; padding: 7px 10px; border-radius: 9px; cursor: pointer;
  background: transparent; color: var(--dim);
  border: 1px solid var(--line); font-size: 13px; font-weight: 600; white-space: nowrap; }
.add.on { background: #1d3327; color: var(--good); border-color: var(--good); }

#endcard { display: flex; flex-direction: column; min-height: 40vh;
  align-items: center; justify-content: center; text-align: center; }
#endhead { color: var(--dim); font-size: 15px; }

/* ---------- Watch: the tracking list ---------- */
.sub { display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; margin-bottom: 6px; border-radius: 10px;
  background: var(--panel); border: 1px solid transparent;
  transition: background .12s, border-color .12s; }
.sub:hover { border-color: var(--line); }
.sub.now { background: #1d2b3d; border-color: var(--accent); }
.sbody { flex: 1; min-width: 0; cursor: pointer; }
.sub .t { color: var(--dim); font-size: 11px; font-variant-numeric: tabular-nums; }
.sub .x { font-size: 18px; }
.sub .roman { color: var(--dim); font-size: 12px; margin-top: 2px; display: none; }
.sub.now .roman { display: block; }

/* ---------- review deck list: remove a mistakenly-saved word ---------- */
.rmword { flex: none; width: 26px; height: 26px; border-radius: 999px; cursor: pointer;
  background: transparent; color: var(--dim); border: 1px solid var(--line); font-size: 13px;
  line-height: 1; }
.rmword:hover { background: var(--again); color: #fff; border-color: var(--again); }

/* ---------- 복습 : laid out like Anki ---------- */
#revcounts { display: flex; justify-content: center; gap: 26px; margin: 6px 0 14px; }
.ct { text-align: center; }
.ct span { display: block; font-size: 26px; font-weight: 700;
           font-variant-numeric: tabular-nums; }
.ct label { font-size: 11px; color: var(--dim); }
.ct.new span { color: var(--accent); }
.ct.lrn span { color: var(--again); }
.ct.rev span { color: var(--good); }
#revstart { width: 100%; padding: 11px; border-radius: 10px; cursor: pointer; border: 0;
  font-size: 15px; font-weight: 700; margin-bottom: 14px;
  background: var(--accent); color: #07121f; }
#revstart:disabled { background: var(--panel); color: var(--dim);
                     border: 1px solid var(--line); cursor: default; }
#revnext:not(:empty) { text-align: center; color: var(--dim); font-size: 12px;
                       margin: -8px 0 12px; }

#revise.on { display: flex; flex-direction: column; padding-bottom: 10px; }
#revcard { flex: 1; min-height: 0; display: flex; flex-direction: column; }
#revremain { text-align: center; color: var(--dim); font-size: 12px;
             font-variant-numeric: tabular-nums; }
#revfront { flex: 1; min-height: 0; overflow-y: auto;
            display: flex; flex-direction: column; justify-content: center;
            text-align: center; }
#revword { font-size: 34px; line-height: 1.25; overflow-wrap: anywhere; }
#revback hr { border: 0; border-top: 1px solid var(--line); margin: 16px auto; width: 70%; }
#revroman { color: var(--accent); font-size: 17px; }
#revlem:not(:empty) { color: var(--hot); font-size: 14px; margin-top: 2px; }
#reven { color: var(--dim); font-size: 15px; margin-bottom: 12px; }
.syl { font-size: 15px; text-align: left; margin: 0 auto 10px; max-width: 320px; }
.syltop { text-align: center; }
.syltop b { font-size: 20px; color: var(--ink); margin-right: 6px; }
.syleq { color: var(--dim); margin-right: 6px; }
.sylname { color: var(--dim); font-size: 12px; }
.syllayout { font-size: 13px; color: var(--ink); margin-top: 6px; }
.syllayout b { color: var(--accent); }
.sylnote { font-size: 12px; color: var(--dim); margin-top: 2px; }
#revbar { padding-top: 10px; }
#revsoundbtns { display: flex; gap: 8px; margin-bottom: 8px; }
#revplay, #revtts { flex: 1; padding: 9px; border-radius: 10px; cursor: pointer;
           background: transparent; color: var(--accent);
           border: 1px solid var(--line); font-size: 13px; }
#revshow { width: 100%; padding: 12px; border-radius: 10px; cursor: pointer; border: 0;
           background: var(--accent); color: #07121f; font-size: 15px; font-weight: 700; }
#revgrades { display: flex; gap: 6px; }
#revgrades button { flex: 1; padding: 12px 0; border-radius: 10px; border: 0; cursor: pointer;
  font-size: 13px; font-weight: 700; color: #07121f; }
#revgrades .again { background: var(--again); color: #fff; }
#revgrades .hard  { background: #f2a65a; }
#revgrades .good  { background: var(--good); }
#revgrades .easy  { background: var(--accent); }

/* ---------- Review sub-tabs: Sound vs Writing ---------- */
#revtabs { display: flex; gap: 6px; margin-bottom: 12px; }
.revtab { flex: 1; padding: 8px 0; border-radius: 9px; cursor: pointer;
  background: var(--panel); color: var(--dim);
  border: 1px solid var(--line); font-size: 13px; font-weight: 600; }
.revtab.on { background: #223145; color: var(--accent); border-color: var(--accent); }
.revpane { display: none; }
.revpane.on { display: flex; flex: 1; min-height: 0; flex-direction: column; }

/* ---------- Writing review: Hangul alphabet lessons + quiz ---------- */
#hghome { display: block; }
#hgcounts { display: flex; justify-content: center; gap: 26px; margin: 6px 0 14px; }
#hglearn, #hgquiz { width: 100%; padding: 11px; border-radius: 10px; cursor: pointer; border: 0;
  font-size: 15px; font-weight: 700; margin-bottom: 10px; }
#hglearn { background: var(--accent); color: #07121f; }
#hgquiz { background: var(--panel); color: var(--ink); border: 1px solid var(--line); }
#hglearn:disabled, #hgquiz:disabled { background: var(--panel); color: var(--dim);
  border: 1px solid var(--line); cursor: default; }

#hgcard, #hgquizcard { flex: 1; min-height: 0; display: flex; flex-direction: column; }
#hgremain, #hqremain { text-align: center; color: var(--dim); font-size: 12px;
  font-variant-numeric: tabular-nums; }
#hgfront, #hqfront { flex: none; display: flex; flex-direction: column; justify-content: center;
  align-items: center; text-align: center; padding: 20px 0; }
#hgletter { font-size: 64px; line-height: 1.2; }
#hgback hr { border: 0; border-top: 1px solid var(--line); margin: 14px auto; width: 70%; }
#hgname { color: var(--accent); font-size: 18px; text-transform: capitalize; }
#hgex { color: var(--dim); font-size: 15px; margin-top: 6px; }
#hgex b { color: var(--ink); font-size: 20px; margin-right: 6px; }
.hgfrom { color: var(--good); font-size: 13px; margin-top: 10px; }
.hgfrom b { color: var(--good); font-size: 13px; margin-right: 0; }
#hgdecklist { text-align: center; color: var(--dim); font-size: 12px; margin-top: 4px; }
#hgbar { display: flex; flex-direction: column; gap: 8px; padding-top: 4px; }
#hghear { padding: 9px; border-radius: 10px; cursor: pointer;
  background: transparent; color: var(--accent); border: 1px solid var(--line); font-size: 13px; }
#hgshow, #hgnext { padding: 12px; border-radius: 10px; cursor: pointer; border: 0;
  background: var(--accent); color: #07121f; font-size: 15px; font-weight: 700; }

#hqprompt { font-size: 48px; line-height: 1.2; }
#hqprompt.small { font-size: 22px; color: var(--dim); }
#hqchoices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
.hqchoice { padding: 16px 0; border-radius: 10px; cursor: pointer;
  background: var(--panel); color: var(--ink); border: 1px solid var(--line); font-size: 20px; }
.hqchoice:disabled { cursor: default; }
.hqchoice.right { background: #1d3327; color: var(--good); border-color: var(--good); }
.hqchoice.wrong { background: #3a1f1f; color: var(--again); border-color: var(--again); }

/* ---------- 변환기 : standalone Hangul -> romanization tool ---------- */
#convin { width: 100%; padding: 12px; border-radius: 10px; font-size: 18px;
  background: var(--panel); color: var(--ink); border: 1px solid var(--line);
  resize: vertical; }
.convresult { margin-top: 12px; padding: 13px; border-radius: 10px;
  background: var(--panel); border: 1px solid var(--line);
  color: var(--accent); font-size: 18px; line-height: 1.7; min-height: 2.7em;
  white-space: pre-wrap; overflow-wrap: anywhere; }

/* ---------- floating transport ---------- */
#playpause { position: fixed; right: 14px; z-index: 6; cursor: pointer;
  border-radius: 999px; border: 1px solid var(--line);
  bottom: calc(14px + var(--safe)); width: 52px; height: 52px;
  font-size: 20px; background: var(--accent); color: #07121f; }

/* ---------- follow toggle (in the header bar) ---------- */
#follow { flex: none; align-self: center; padding: 7px 12px; border-radius: 999px;
  cursor: pointer; border: 1px solid var(--line); font-size: 12px;
  background: var(--panel); color: var(--dim); }
#follow.on { background: #1d3327; color: var(--good); border-color: var(--good); }