/* ============ samut khoi dam: blackened khoi paper, gold ink ============ */
:root{
  --paper:#1b120b;
  --paper-2:#20160d;
  --panel:#261a10;
  --panel-2:#2e2013;
  --ink:#f1e5ca;
  --ink-dim:#c4b294;
  --ink-faint:#93826a;
  --gold:#d5a24b;
  --gold-hi:#f0c476;
  --lacquer:#c8452f;
  --lacquer-dim:#8f3021;
  --teal:#5b967f;
  --teal-hi:#7fb99f;
  --line:rgba(213,162,75,.24);
  --line-soft:rgba(213,162,75,.13);
  --radius:10px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  font-family:'Sarabun','Noto Sans Thai','Thonburi','Sukhumvit Set',sans-serif;
  font-weight:400;
  background:
    repeating-linear-gradient(180deg, transparent 0 152px, rgba(240,196,118,.045) 152px 153px),
    radial-gradient(120% 90% at 50% -10%, #2a1c0f 0%, var(--paper) 55%, #150d07 100%);
  color:var(--ink);
  line-height:1.55;
  min-height:100vh;
}
::selection{background:rgba(213,162,75,.35)}

.wrap{max-width:740px;margin:0 auto;padding:0 16px 72px}

/* ---------- header ---------- */
.zig{
  height:9px;margin:0 auto;max-width:740px;opacity:.6;
  background:
    linear-gradient(135deg, var(--gold) 5px, transparent 0) 0 0,
    linear-gradient(-135deg, var(--gold) 5px, transparent 0) 7px 0;
  background-size:14px 9px;background-repeat:repeat-x;
}
header{padding:26px 0 18px;text-align:center;border-bottom:1px solid var(--line-soft);margin-bottom:18px}
h1{
  font-family:'Srisakdi','Sarabun','Thonburi',sans-serif;font-weight:700;
  font-size:clamp(2.4rem,9vw,3.6rem);line-height:1.15;
  color:var(--gold-hi);text-shadow:0 0 26px rgba(213,162,75,.25);
}
.subtitle{color:var(--ink);font-size:1.02rem;font-weight:500;margin-top:2px}
.why{color:var(--ink-dim);font-size:.86rem;max-width:56ch;margin:10px auto 0;font-style:italic}
.chips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:12px}
.chip{
  font-size:.74rem;letter-spacing:.04em;color:var(--gold);
  border:1px solid var(--line);border-radius:99px;padding:3px 11px;
  background:rgba(213,162,75,.06);
}

/* ---------- mode tabs ---------- */
.modes{display:flex;gap:8px;margin:16px 0 14px;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.modes::-webkit-scrollbar{display:none}
.mode{
  flex:1 0 auto;min-width:96px;padding:10px 10px;border-radius:var(--radius);cursor:pointer;
  background:var(--panel);border:1px solid var(--line-soft);color:var(--ink-dim);
  font-family:inherit;font-size:.86rem;font-weight:600;line-height:1.3;
  transition:border-color .15s,color .15s,background .15s;
}
.mode small{display:block;font-weight:400;font-size:.72rem;color:var(--ink-faint)}
.mode[aria-pressed="true"]{border-color:var(--gold);color:var(--gold-hi);background:var(--panel-2)}
.mode[aria-pressed="true"] small{color:var(--ink-dim)}

/* ---------- stats ---------- */
.stats{display:flex;justify-content:space-between;align-items:baseline;font-size:.84rem;color:var(--ink-dim);margin-bottom:8px;padding:0 2px}
.stats b{color:var(--gold-hi);font-weight:600}
.romkey-inline{font-size:.78rem;color:var(--ink-faint);text-align:center;margin:0 0 10px;line-height:1.5}
.romkey-inline b{color:var(--gold);font-weight:600}
.streakfire{color:var(--lacquer)}

/* ---------- drill card ---------- */
.card{
  background:linear-gradient(180deg,var(--panel) 0%,var(--paper-2) 100%);
  border:1px solid var(--line);border-radius:14px;
  padding:22px 18px 18px;box-shadow:0 10px 34px rgba(0,0,0,.45), inset 0 1px 0 rgba(240,196,118,.08);
}
.prompt{text-align:center;color:var(--ink-dim);font-size:.9rem;letter-spacing:.03em}
.stage{
  display:grid;place-items:center;
  min-height:clamp(150px,30vw,210px);padding:2px 0 8px;
}
.glyph{
  text-align:center;font-weight:400;color:#f7ecd3;
  font-size:clamp(72px,22vw,132px);line-height:1.35;
  text-shadow:0 0 44px rgba(213,162,75,.22);
}
.glyph.word{font-size:clamp(44px,14vw,86px)}
.glyph .slot{color:var(--ink-faint);opacity:.55}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:460px){.opts{grid-template-columns:1fr}}
.opt{
  position:relative;display:flex;align-items:center;gap:10px;
  padding:12px 12px 12px 12px;border-radius:var(--radius);cursor:pointer;text-align:left;
  background:linear-gradient(180deg,#2b1e12,#241a10);
  border:1px solid var(--line);color:var(--ink);
  font-family:inherit;font-size:1.02rem;font-weight:500;
  transition:transform .12s,border-color .12s,background .12s;
}
.opt:hover:not(:disabled){transform:translateY(-1px);border-color:var(--gold)}
.opt .key{
  flex:none;width:22px;height:22px;border-radius:6px;display:grid;place-items:center;
  font-size:.72rem;font-weight:700;color:var(--gold);
  border:1px solid var(--line);background:rgba(213,162,75,.08);
}
.opt:disabled{cursor:default;opacity:.45}
.opt.correct{opacity:1;border-color:var(--teal);background:rgba(91,150,127,.16);color:var(--teal-hi)}
.opt.correct .key{border-color:var(--teal);color:var(--teal-hi)}
.opt.wrongpick{opacity:1;border-color:var(--lacquer);background:rgba(200,69,47,.14);color:#e8a596}
.opt.wrongpick .key{border-color:var(--lacquer);color:#e8a596}

.feedback{min-height:26px;margin-top:12px;text-align:center;font-weight:600;font-size:.98rem}
.feedback.good{color:var(--teal-hi)}
.feedback.bad{color:#e8907d}
.kbdhint{text-align:center;color:var(--ink-faint);font-size:.74rem;margin-top:6px}
.nextrow{
  /* must clear the fixed bottom nav, or it parks underneath it */
  position:sticky;bottom:calc(64px + env(safe-area-inset-bottom,0px));z-index:6;
  display:flex;justify-content:center;margin-top:12px;pointer-events:none;
}
.next{pointer-events:auto}
.next{
  display:none;padding:10px 34px;border-radius:99px;cursor:pointer;
  font-family:inherit;font-size:.95rem;font-weight:700;letter-spacing:.02em;
  background:var(--gold);border:1px solid var(--gold-hi);color:#241605;
  box-shadow:0 4px 18px rgba(213,162,75,.3);
}
.next:hover{background:var(--gold-hi)}
.next.show{display:inline-block}

/* ---------- teaching panel ---------- */
.panel{display:none;margin-top:16px;border-top:1px dashed var(--line);padding-top:14px}
.panel.show{display:block}
.panel h3{
  font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--gold);font-weight:700;margin-bottom:10px;
}
.factrow{display:flex;gap:14px;align-items:flex-start;flex-wrap:wrap}
.bigchar{
  flex:none;font-size:64px;line-height:1.2;color:#f7ecd3;min-width:74px;text-align:center;
  background:rgba(213,162,75,.05);border:1px solid var(--line-soft);border-radius:var(--radius);padding:4px 10px;
}
.facts{flex:1;min-width:220px;font-size:.94rem}
.facts .row{display:flex;gap:8px;margin-bottom:4px;align-items:baseline}
.facts .lbl{flex:none;width:64px;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}
.facts .val{color:var(--ink)}
.facts .val b{color:var(--gold-hi);font-weight:600}
.classchip{display:inline-block;font-size:.72rem;border:1px solid var(--line);border-radius:99px;padding:1px 9px;color:var(--gold);background:rgba(213,162,75,.07)}
.rarechip{display:inline-block;font-size:.72rem;border:1px solid rgba(200,69,47,.5);border-radius:99px;padding:1px 9px;color:#e8a596;background:rgba(200,69,47,.08)}

.lookbox{margin-top:14px;background:rgba(0,0,0,.22);border:1px solid var(--line-soft);border-radius:var(--radius);padding:12px 14px}
.lookbox h4{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--lacquer);margin-bottom:8px;font-weight:700}
.lookpair{display:flex;gap:18px;align-items:center;justify-content:center;margin-bottom:8px}
.lookpair .lp{text-align:center}
.lookpair .lp .ch{font-size:56px;line-height:1.2;color:#f7ecd3}
.lookpair .lp.alien .ch{color:var(--ink-faint)}
.lookpair .lp .cap{font-size:.72rem;color:var(--ink-faint)}
.lookpair .vs{color:var(--ink-faint);font-size:.8rem}
.lookdiff{font-size:.88rem;color:var(--ink-dim);text-align:center;max-width:52ch;margin:0 auto}

/* word breakdown */
.partsrow{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:10px 0 12px}
.part{
  text-align:center;border:1px solid var(--line-soft);border-radius:var(--radius);
  padding:8px 12px;background:rgba(213,162,75,.04);min-width:78px;
}
.part .pch{font-size:38px;line-height:1.25;color:#f7ecd3}
.part .prole{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);margin-top:2px}
.part .pnote{font-size:.76rem;color:var(--ink-dim);margin-top:1px;max-width:16ch}
.tonebox{
  font-size:.9rem;text-align:center;color:var(--ink);margin-bottom:8px;
  border:1px solid var(--line-soft);border-radius:var(--radius);padding:8px 10px;background:rgba(0,0,0,.18);
}
.tonebox b{color:var(--gold-hi)}
.rulenote{font-size:.88rem;color:var(--ink-dim);text-align:center;max-width:56ch;margin:0 auto}
.flagchip{display:block;width:fit-content;margin:10px auto 0;font-size:.78rem;border-radius:99px;padding:3px 12px}
.flagchip.reg{border:1px solid rgba(91,150,127,.5);color:var(--teal-hi);background:rgba(91,150,127,.08)}
.flagchip.irr{border:1px solid rgba(213,162,75,.55);color:var(--gold-hi);background:rgba(213,162,75,.1)}

/* ---------- exposure strip ---------- */
.expwrap{margin:18px 0 8px}
.expwrap h2{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;margin-bottom:8px}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(56px,1fr));gap:7px}
.tile{
  border:1px solid var(--line-soft);border-radius:8px;padding:6px 3px 5px;text-align:center;
  background:rgba(0,0,0,.16);
}
.tile .t{font-size:1.28rem;line-height:1.3;color:var(--ink)}
.tile .t.small{font-size:.98rem}
.tile .bar{height:3px;border-radius:2px;background:#3a2b17;margin-top:5px;overflow:hidden}
.tile .fill{height:100%;background:var(--gold);width:0%}
.tile.rough .fill{background:var(--lacquer)}

/* ---------- reference sections ---------- */
.refs{margin-top:34px}
.refs>h2{
  font-family:'Srisakdi','Sarabun','Thonburi',sans-serif;font-weight:700;color:var(--gold-hi);
  font-size:1.7rem;text-align:center;margin-bottom:4px;
}
.refs>.refsub{text-align:center;color:var(--ink-faint);font-size:.84rem;margin-bottom:16px}
details{
  border:1px solid var(--line-soft);border-radius:12px;background:var(--panel);
  margin-bottom:10px;overflow:hidden;
}
details[open]{border-color:var(--line)}
summary{
  cursor:pointer;list-style:none;padding:13px 16px;font-weight:600;font-size:.98rem;color:var(--ink);
  display:flex;align-items:center;gap:10px;
}
summary::-webkit-details-marker{display:none}
summary::before{content:"❖";color:var(--gold);font-size:.8rem;transition:transform .15s}
details[open] summary::before{transform:rotate(45deg)}
summary small{color:var(--ink-faint);font-weight:400;font-size:.8rem}
.dbody{padding:2px 16px 18px;font-size:.93rem;color:var(--ink-dim)}
.dbody p{margin-bottom:10px}
.dbody p b,.dbody li b{color:var(--ink);font-weight:600}
.dbody .th{color:#f7ecd3;font-size:1.15em}
.dbody ul{margin:0 0 10px 18px}
.dbody li{margin-bottom:6px}
.dbody h4{color:var(--gold);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;margin:14px 0 6px}

/* tables */
.tbl{width:100%;border-collapse:collapse;font-size:.9rem;margin-bottom:8px}
.tbl th{
  text-align:left;font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);
  font-weight:600;padding:6px 8px;border-bottom:1px solid var(--line);
}
.tbl td{padding:7px 8px;border-bottom:1px solid var(--line-soft);vertical-align:top;color:var(--ink-dim)}
.tbl td.g{font-size:1.7rem;color:#f7ecd3;line-height:1.2}
.tbl td .mean{color:var(--ink-faint);font-size:.82rem}
.tbl tr:last-child td{border-bottom:none}

/* formula */
.formula{
  display:flex;gap:8px;align-items:center;justify-content:center;flex-wrap:wrap;
  margin:12px 0;font-size:.86rem;font-weight:600;
}
.formula .f{border:1px solid var(--line);border-radius:8px;padding:6px 12px;background:rgba(213,162,75,.06);color:var(--gold-hi)}
.formula .op{color:var(--ink-faint)}
.rulechips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:10px 0}
.rulechip{font-size:.84rem;border-radius:99px;padding:5px 14px;border:1px solid var(--line);color:var(--ink)}
.rulechip b{color:var(--gold-hi)}

/* two-column contrastive tables */
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line-soft);border:1px solid var(--line-soft);border-radius:10px;overflow:hidden;margin:8px 0 14px}
.cmp>div{background:var(--paper-2);padding:9px 11px;font-size:.87rem;color:var(--ink-dim)}
.cmp .hd{background:var(--panel-2);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);font-weight:700}
.cmp .th{color:#f7ecd3;font-size:1.06rem}
.cmp .rom{color:var(--gold-hi)}
.cmp .gl{color:var(--ink-faint);font-size:.8rem}
.pt{margin-bottom:18px}
.pt h4{color:var(--ink);font-size:.98rem;margin-bottom:2px}
.pt h4 .num{color:var(--lacquer);font-family:'Srisakdi',sans-serif;font-weight:700;margin-right:6px}
.pt .lede{font-size:.87rem;color:var(--ink-faint);margin-bottom:6px}

.helps{border:1px solid rgba(91,150,127,.4);border-radius:10px;padding:12px 16px;margin-bottom:10px;background:rgba(91,150,127,.05)}
.helps h4{color:var(--teal-hi)!important}
.hurts{border:1px solid rgba(200,69,47,.4);border-radius:10px;padding:12px 16px;background:rgba(200,69,47,.05)}
.hurts h4{color:#e8a596!important}

/* ---------- primer overlay ---------- */
.overlay{
  position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  background:rgba(12,8,4,.86);padding:18px;
}
.overlay.hidden{display:none}
.primer{
  max-width:520px;width:100%;max-height:88vh;overflow:auto;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--gold);border-radius:16px;padding:26px 24px;
  box-shadow:0 24px 70px rgba(0,0,0,.6);
}
.primer h2{font-family:'Srisakdi',sans-serif;color:var(--gold-hi);font-size:1.7rem;line-height:1.2;margin-bottom:10px}
.primer p{font-size:.94rem;color:var(--ink-dim);margin-bottom:10px}
.primer p b{color:var(--ink)}
.begin{
  width:100%;margin-top:8px;padding:13px;border-radius:99px;cursor:pointer;
  font-family:inherit;font-size:1rem;font-weight:700;
  background:var(--gold);border:1px solid var(--gold-hi);color:#241605;
}
.begin:hover{background:var(--gold-hi)}

footer{margin-top:36px;text-align:center;color:var(--ink-faint);font-size:.8rem;line-height:1.7}
footer .romkey{color:var(--ink-dim)}

/* ---------- a11y ---------- */
:focus-visible{outline:2px solid var(--gold-hi);outline-offset:2px;border-radius:6px}
@media(max-width:460px){
  .card{padding:16px 12px 14px}
  .stage{min-height:150px}
  .opt{padding:11px 10px;font-size:.98rem}
  .wrap{padding:0 12px 64px}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}

/* ---------- tone production + cross-reference (v5) ---------- */
.tonecards{display:grid;gap:8px;margin:12px 0 14px}
.tonecard{display:flex;align-items:center;gap:12px;border:1px solid var(--line-soft);border-radius:10px;padding:10px 12px;background:rgba(0,0,0,.2)}
.tonecard .tc-th{flex:none;font-size:2.1rem;line-height:1.35;color:#f7ecd3;min-width:56px;text-align:center}
.tonecard .tc-body{flex:1;min-width:0}
.tonecard .tc-top{font-size:.92rem;color:var(--ink)}
.tonecard .tc-top b{font-weight:700}
.tonecard .tc-gl{color:var(--ink-faint);font-size:.84rem}
.tonecard .tc-trig{font-size:.85rem;color:var(--ink-dim);margin-top:3px;line-height:1.45}
.tonecard .say{flex:none}
.taught{color:var(--gold-hi)}
.freqchip{display:inline-block;font-size:.66rem;letter-spacing:.05em;text-transform:uppercase;
  border-radius:99px;padding:2px 8px;margin-left:7px;vertical-align:middle;white-space:nowrap}
.freqchip.f1{color:var(--teal-hi);border:1px solid rgba(91,150,127,.55);background:rgba(91,150,127,.1)}
.freqchip.f2{color:var(--ink-dim);border:1px solid var(--line-soft)}
.corebar{position:relative;height:10px;border-radius:5px;background:#3a2b17;overflow:hidden}
.corefill{position:absolute;left:0;top:0;bottom:0;background:rgba(213,162,75,.45)}
.coresolid{position:absolute;left:0;top:0;bottom:0;background:var(--teal)}
.tbl.sounds td{font-size:.95rem}
.tbl.sounds td.g{font-size:1.45rem;line-height:1.5}

/* ---------- audio (v4) ---------- */
.audiobar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 12px;font-size:.76rem;color:var(--ink-faint);line-height:1.4}
.audiobar b{color:var(--gold);font-weight:600}
.autobtn{flex:none;font-family:inherit;font-size:.73rem;font-weight:600;padding:4px 12px;border-radius:99px;cursor:pointer;background:rgba(213,162,75,.1);border:1px solid var(--line);color:var(--gold)}
.autobtn[aria-pressed="false"]{color:var(--ink-faint);border-color:var(--line-soft);background:transparent}
.say{display:inline-flex;align-items:center;justify-content:center;cursor:pointer;border-radius:99px;padding:0;vertical-align:middle;
  background:rgba(213,162,75,.1);border:1px solid var(--line);color:var(--gold);transition:background .12s,color .12s}
.say.sm{width:24px;height:24px;margin-left:7px}
.say.big{width:54px;height:54px}
.say.big svg{width:22px;height:22px}
.say:hover{background:rgba(213,162,75,.22);color:var(--gold-hi)}
.sayrow{display:flex;justify-content:center;margin-top:12px}
.sayrow:empty{margin:0}
.humanlink{font-size:.79rem;color:var(--ink-faint);text-align:center;margin-top:12px}
.humanlink a{color:var(--gold);text-decoration:none;border-bottom:1px solid var(--line)}
.humanlink a:hover{color:var(--gold-hi)}
.codebox{width:100%;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.7rem;line-height:1.4;
  background:rgba(0,0,0,.3);border:1px solid var(--line-soft);border-radius:8px;color:var(--ink-dim);
  padding:8px 10px;resize:vertical}
.codehint{font-size:.78rem;color:var(--ink-faint);margin:0 0 8px;line-height:1.5}

/* ---------- meaning + spelling modes (v3) ---------- */
.glyph.phrase{font-size:clamp(30px,9vw,58px);line-height:1.5}
.glyph.cue{display:flex;flex-direction:column;gap:4px;font-size:1rem}
.cueline{font-size:clamp(28px,8vw,46px);color:var(--gold-hi);font-weight:600;line-height:1.2}
.cuegloss{font-size:clamp(15px,4vw,20px);color:var(--ink-dim);font-weight:400}
.opt.thai span:last-child{font-size:1.55rem;line-height:1.5}
.opt.thai{padding:8px 12px}
.spellnote{margin:0 0 0 18px;font-size:.88rem;color:var(--ink-dim)}
.spellnote li{margin-bottom:5px}
.spellnote .th{color:#f7ecd3;font-size:1.15em}
.spellnote b{color:var(--gold-hi)}
.tbl td.r{color:var(--gold-hi);white-space:nowrap;font-size:.88rem}

/* ---------- unit rail (added in v2) ---------- */
.unitrail{display:flex;gap:8px;overflow-x:auto;padding:12px 2px 4px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.unitrail::-webkit-scrollbar{display:none}
.unitpill{
  flex:none;min-width:132px;text-align:left;cursor:pointer;
  padding:9px 13px;border-radius:12px;background:var(--panel);
  border:1px solid var(--line-soft);color:var(--ink-dim);
  font-family:inherit;font-size:.88rem;font-weight:600;line-height:1.25;
}
.unitpill .n{font-family:'Srisakdi','Sarabun','Thonburi',sans-serif;color:var(--lacquer);font-size:.86rem;display:block}
.unitpill small{display:block;font-weight:400;font-size:.72rem;color:var(--ink-faint);margin-top:1px}
.unitpill[aria-pressed="true"]{border-color:var(--gold);color:var(--gold-hi);background:var(--panel-2)}
.unitpill[aria-pressed="true"] .n{color:var(--gold)}
.unitintro{
  border-left:2px solid var(--gold);padding:2px 0 2px 12px;margin:12px 0 4px;
  font-size:.88rem;color:var(--ink-dim);
}
.unitintro b{color:var(--ink)}
.unitintro .unlocks{display:block;margin-top:4px;font-size:.8rem;color:var(--gold)}

/* tone chips + matrix */
.tone-mid{color:#cbbb9a}.tone-low{color:#8fb8a3}.tone-falling{color:#e0a06e}
.tone-high{color:#e2857a}.tone-rising{color:#a99ad6}
.matrix{width:100%;border-collapse:collapse;font-size:.84rem;margin:8px 0 10px}
.matrix th,.matrix td{border:1px solid var(--line-soft);padding:6px 7px;text-align:center}
.matrix th{font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);font-weight:600}
.matrix td.rowh{text-align:left;color:var(--ink);font-weight:600;white-space:nowrap}
.matrix tr.dim td{color:var(--ink-faint);opacity:.55}
.matrix .na{color:var(--ink-faint)}
.pairs{width:100%;border-collapse:collapse;font-size:.9rem;margin:6px 0 10px}
.pairs td{padding:7px 8px;border-bottom:1px solid var(--line-soft);vertical-align:middle}
.pairs td.a{color:#f7ecd3;font-size:1.3rem;width:1%;white-space:nowrap}
.pairs td.r{color:var(--gold-hi);white-space:nowrap;width:1%}
.pairs td.g{color:var(--ink-faint);font-size:.84rem}
.pairs tr:last-child td{border-bottom:none}
.twincol{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0}
@media(max-width:460px){.twincol{grid-template-columns:1fr}}
.twin{border:1px solid var(--line-soft);border-radius:10px;padding:10px 12px;background:rgba(0,0,0,.18)}
.twin .big{font-size:1.9rem;color:#f7ecd3;line-height:1.3}
.twin .lab{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold);margin-bottom:2px}
.twin .sm{font-size:.84rem;color:var(--ink-dim)}
.preview{border:1px dashed var(--line);border-radius:10px;padding:10px 13px;margin:10px 0;font-size:.86rem;color:var(--ink-faint)}
.preview b{color:var(--gold)}

/* ================================================================
   v6 — app shell: four views, bottom nav, sheets, rounds
   ================================================================ */
body{padding-bottom:calc(64px + env(safe-area-inset-bottom,0px))}
.wrap{max-width:740px;margin:0 auto;padding:0 16px 24px}

/* ---- top bar: always tells you where you are ---- */
.topbar{
  position:sticky;top:0;z-index:30;
  background:linear-gradient(180deg,rgba(27,18,11,.97) 70%,rgba(27,18,11,.82));
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line-soft);
  padding:calc(8px + env(safe-area-inset-top,0px)) 0 9px;margin-bottom:14px;
}
.topbar-in{max-width:740px;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:10px}
/* Back to the course picker. One PWA holds every course, so this is the switcher. */
.courses{
  flex:none;width:30px;height:30px;border-radius:99px;display:grid;place-items:center;
  border:1px solid var(--line-soft);color:var(--ink-faint);text-decoration:none;
}
.courses svg{width:16px;height:16px}
.courses:hover{color:var(--gold);border-color:var(--line)}
.crumb{
  flex:none;display:flex;align-items:center;gap:7px;cursor:pointer;
  font-family:inherit;font-size:.86rem;font-weight:600;color:var(--gold-hi);
  background:rgba(213,162,75,.08);border:1px solid var(--line);border-radius:99px;padding:6px 12px;
}
.crumb .cn{font-family:'Srisakdi','Sarabun',sans-serif;color:var(--gold)}
.crumb .cm{color:var(--ink-dim);font-weight:400}
.crumb::after{content:"▾";font-size:.7rem;color:var(--ink-faint);margin-left:1px}
.roundbar{flex:1;display:flex;align-items:center;gap:8px;min-width:0}
.pips{display:flex;gap:3px;flex:1;min-width:0}
.pip{flex:1;height:4px;border-radius:2px;background:#3a2b17;max-width:22px}
.pip.hit{background:var(--teal)}
.pip.miss{background:var(--lacquer)}
.pip.now{background:var(--gold)}
.streakchip{flex:none;font-size:.78rem;color:var(--ink-dim)}
.streakchip b{color:var(--gold-hi)}
.gear{flex:none;width:32px;height:32px;border-radius:99px;cursor:pointer;display:grid;place-items:center;
  background:transparent;border:1px solid var(--line-soft);color:var(--ink-faint);font-size:.9rem}
.gear:hover{color:var(--gold);border-color:var(--line)}

/* ---- views ---- */
[data-view]{display:none}
[data-view].on{display:block}

/* ---- bottom nav ---- */
.nav{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  display:flex;background:rgba(30,20,12,.97);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-top:1px solid var(--line-soft);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
.navbtn{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:9px 4px 8px;cursor:pointer;background:none;border:none;
  font-family:inherit;font-size:.68rem;font-weight:600;letter-spacing:.02em;
  color:var(--ink-faint);
}
.navbtn svg{width:21px;height:21px}
.navbtn[aria-current="true"]{color:var(--gold-hi)}
.navbtn .dot{width:4px;height:4px;border-radius:99px;background:var(--lacquer);margin-top:1px}

/* ---- sheets ---- */
.sheet{position:fixed;inset:0;z-index:60;display:none}
.sheet.on{display:block}
.sheet-bg{position:absolute;inset:0;background:rgba(12,8,4,.72)}
.sheet-in{
  position:absolute;left:0;right:0;bottom:0;max-height:82vh;overflow:auto;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border-top:1px solid var(--gold);border-radius:18px 18px 0 0;
  padding:18px 18px calc(24px + env(safe-area-inset-bottom,0px));
  box-shadow:0 -18px 60px rgba(0,0,0,.6);
}
.sheet-in{max-width:740px;margin:0 auto}
.sheet h3{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:12px}
.sheet-close{position:absolute;right:16px;top:14px;width:30px;height:30px;border-radius:99px;cursor:pointer;
  background:rgba(0,0,0,.3);border:1px solid var(--line-soft);color:var(--ink-dim);font-size:1rem;line-height:1}
.pickrow{
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;cursor:pointer;
  background:rgba(0,0,0,.2);border:1px solid var(--line-soft);border-radius:12px;
  padding:11px 13px;margin-bottom:8px;font-family:inherit;color:var(--ink);
}
.pickrow[aria-pressed="true"]{border-color:var(--gold);background:var(--panel-2)}
.pickrow .pk-n{flex:none;font-family:'Srisakdi',sans-serif;color:var(--gold);font-size:1rem;min-width:20px}
.pickrow .pk-b{flex:1;min-width:0}
.pickrow .pk-t{font-size:.94rem;font-weight:600}
.pickrow .pk-s{font-size:.78rem;color:var(--ink-faint);margin-top:1px}
.vdot{flex:none;width:9px;height:9px;border-radius:99px;background:#3a2b17}
.vdot.ready{background:var(--teal)}
.vdot.slow{background:var(--gold)}
.vdot.work{background:var(--lacquer)}
.vdot.early{background:var(--ink-faint)}

/* ---- round result screen ---- */
.result{text-align:center;padding:6px 0 4px}
.result .score{font-family:'Srisakdi',sans-serif;font-size:3.4rem;line-height:1.1;color:var(--gold-hi)}
.result .score small{font-size:1.3rem;color:var(--ink-faint)}
.result .meta{font-size:.86rem;color:var(--ink-dim);margin-top:2px}
.verdict{border-radius:12px;padding:13px 15px;margin:16px 0 4px;text-align:left;border:1px solid}
.verdict.ready{border-color:rgba(91,150,127,.55);background:rgba(91,150,127,.08)}
.verdict.slow{border-color:rgba(213,162,75,.5);background:rgba(213,162,75,.07)}
.verdict.work{border-color:rgba(200,69,47,.45);background:rgba(200,69,47,.07)}
.verdict.early{border-color:var(--line-soft);background:rgba(0,0,0,.2)}
.verdict .vt{font-size:.98rem;font-weight:700;margin-bottom:3px}
.verdict.ready .vt{color:var(--teal-hi)}
.verdict.slow .vt{color:var(--gold-hi)}
.verdict.work .vt{color:#e8a596}
.verdict.early .vt{color:var(--ink-dim)}
.verdict .vd{font-size:.87rem;color:var(--ink-dim);line-height:1.5}
.misslist{margin:14px 0 0;text-align:left}
.misslist h4{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--lacquer);margin-bottom:8px;font-weight:700}
.missrow{display:flex;align-items:center;gap:10px;padding:7px 0;border-bottom:1px solid var(--line-soft);font-size:.9rem}
.missrow:last-child{border-bottom:none}
.missrow .mth{font-size:1.4rem;color:#f7ecd3;min-width:46px}
.missrow .mr{color:var(--gold-hi);white-space:nowrap}
.missrow .mg{color:var(--ink-faint);font-size:.8rem;flex:1;min-width:0}
.btnrow{display:flex;gap:9px;margin-top:18px;flex-wrap:wrap}
.btnrow button{flex:1 0 auto;min-width:110px;padding:12px 16px;border-radius:99px;cursor:pointer;
  font-family:inherit;font-size:.92rem;font-weight:700}
.btn-pri{background:var(--gold);border:1px solid var(--gold-hi);color:#241605}
.btn-pri:hover{background:var(--gold-hi)}
.btn-sec{background:transparent;border:1px solid var(--line);color:var(--ink)}
.btn-sec:hover{border-color:var(--gold);color:var(--gold-hi)}

/* ---- map view ---- */
.viewhead{margin-bottom:16px}
.viewhead h1{font-family:'Srisakdi','Sarabun','Thonburi',sans-serif;font-weight:700;color:var(--gold-hi);
  font-size:clamp(1.9rem,7vw,2.5rem);line-height:1.15}
.viewhead p{color:var(--ink-dim);font-size:.88rem;margin-top:4px}
.unitcard{
  display:block;width:100%;text-align:left;cursor:pointer;margin-bottom:10px;
  background:linear-gradient(180deg,var(--panel),var(--paper-2));
  border:1px solid var(--line-soft);border-radius:14px;padding:14px 15px;
  font-family:inherit;color:var(--ink);
}
.unitcard.here{border-color:var(--gold);box-shadow:0 0 0 1px rgba(213,162,75,.2)}
.unitcard.next{border-color:rgba(91,150,127,.5)}
.uc-top{display:flex;align-items:baseline;gap:9px}
.uc-n{font-family:'Srisakdi',sans-serif;font-size:1.15rem;color:var(--gold)}
.uc-name{font-size:1.05rem;font-weight:700;flex:1}
.uc-tag{font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;padding:2px 8px;border-radius:99px}
.uc-tag.here{color:var(--gold-hi);border:1px solid var(--line)}
.uc-tag.next{color:var(--teal-hi);border:1px solid rgba(91,150,127,.5)}
.uc-sub{font-size:.82rem;color:var(--ink-faint);margin-top:3px}
.uc-pay{font-size:.83rem;color:var(--ink-dim);margin-top:7px}
.uc-pay .th{color:#f7ecd3;font-size:1.15em}
.uc-pay b{color:var(--gold-hi)}
.uc-pay .pg{color:var(--ink-faint)}
.uc-lesson{display:inline-block;margin-top:10px;font-size:.78rem;font-weight:700;color:var(--gold);
  border:1px solid var(--line);border-radius:99px;padding:4px 12px;background:rgba(213,162,75,.08)}
.uc-modes{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.uc-mode{display:flex;align-items:center;gap:5px;font-size:.74rem;color:var(--ink-dim);
  border:1px solid var(--line-soft);border-radius:99px;padding:3px 9px}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:.76rem;color:var(--ink-faint);margin:4px 0 18px}
.legend span{display:flex;align-items:center;gap:6px}

/* ---- stats view ---- */
.bigstats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:18px}
.bigstat{background:var(--panel);border:1px solid var(--line-soft);border-radius:12px;padding:12px 10px;text-align:center}
.bigstat .n{font-family:'Srisakdi',sans-serif;font-size:1.7rem;color:var(--gold-hi);line-height:1.1}
.bigstat .l{font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);margin-top:2px}
.sechead{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);font-weight:700;margin:22px 0 8px}
.sechint{font-size:.82rem;color:var(--ink-faint);margin-bottom:10px;line-height:1.5}

/* ---- guide view grouping ---- */
.gguide{margin-bottom:22px}
.gguide>h3{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);font-weight:700;margin-bottom:4px}
.gguide>p.gh{font-size:.82rem;color:var(--ink-faint);margin-bottom:10px}
.whystrip{margin-bottom:12px;background:rgba(213,162,75,.05);border-color:var(--line-soft)}
.whystrip summary{padding:9px 13px;font-size:.83rem;font-weight:400;color:var(--ink-faint)}
.whystrip summary b{color:var(--gold);font-weight:600;margin-right:4px}
.whystrip summary::before{font-size:.7rem}
.whystrip .dbody{padding:0 13px 13px;font-size:.88rem}
.refs{margin-top:0}
.refs>h2,.refs>.refsub{display:none}

/* ================================================================
   v7 — lesson layer: interactive teaching before the drill
   ================================================================ */
.lessonhead{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.lback{flex:none;font-family:inherit;font-size:.82rem;font-weight:600;cursor:pointer;padding:6px 12px;
  border-radius:99px;background:transparent;border:1px solid var(--line-soft);color:var(--ink-dim)}
.lback:hover{color:var(--gold);border-color:var(--line)}
.lsteps{flex:1;display:flex;gap:5px}
.lstep{flex:1;height:4px;border-radius:2px;background:#3a2b17;max-width:44px}
.lstep.done{background:var(--gold)}
.lstep.now{background:var(--gold-hi)}
.lesson-h{font-family:'Srisakdi','Sarabun','Thonburi',sans-serif;font-weight:700;color:var(--gold-hi);
  font-size:clamp(1.35rem,5.5vw,1.75rem);line-height:1.25;margin-bottom:6px}
.lesson-p{font-size:.94rem;color:var(--ink-dim);line-height:1.6;margin-bottom:14px}
.lesson-p b{color:var(--ink)}
.lesson-p .th{color:#f7ecd3;font-size:1.15em}
.lesson-foot{font-size:.84rem;color:var(--ink-faint);margin-top:14px;text-align:center;line-height:1.5}

/* --- the tone machine --- */
.machine{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:rgba(0,0,0,.22)}
.mrow{display:flex;align-items:center;gap:10px;padding:10px 12px;border-bottom:1px solid var(--line-soft);flex-wrap:wrap}
.mlab{flex:none;width:96px;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}
.mopts{flex:1;display:flex;gap:6px;flex-wrap:wrap;min-width:0}
.mopt{font-family:inherit;font-size:.86rem;font-weight:600;cursor:pointer;padding:6px 13px;border-radius:99px;
  background:rgba(213,162,75,.06);border:1px solid var(--line-soft);color:var(--ink-dim)}
.mopt[aria-pressed="true"]{background:var(--gold);border-color:var(--gold-hi);color:#241605}
.mopt:disabled{opacity:.4;cursor:default}
.mopt.thai{font-size:1.15rem;line-height:1.2;padding:2px 14px}
.mout{padding:14px 12px;text-align:center;background:rgba(0,0,0,.25)}
.mtone{font-family:'Srisakdi','Sarabun',sans-serif;font-size:2.1rem;line-height:1.15;font-weight:700}
.mformula{font-size:.76rem;color:var(--ink-faint);margin-top:2px}
.mex{margin-top:9px;font-size:1rem;color:var(--ink)}
.mex .th{font-size:1.5rem;color:#f7ecd3;vertical-align:middle}
.mex b{color:var(--gold-hi)}
.mex .mg{color:var(--ink-faint);font-size:.85rem}
.mex.mnone{font-size:.85rem;color:var(--ink-faint)}

/* --- letter grid --- */
.lgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(58px,1fr));gap:7px;margin-bottom:12px}
.lcell{cursor:pointer;border-radius:10px;padding:9px 3px;background:rgba(0,0,0,.2);
  border:1px solid var(--line-soft);color:#f7ecd3;font-family:inherit;font-size:1.6rem;line-height:1.3}
.lcell[aria-pressed="true"]{border-color:var(--gold);background:rgba(213,162,75,.12)}
.linfo{min-height:60px;border:1px solid var(--line-soft);border-radius:10px;padding:11px 13px;
  background:rgba(0,0,0,.2);font-size:.9rem;color:var(--ink-dim)}
.linfo b{color:var(--gold-hi)}
.linfo .big{font-size:1.5rem;color:#f7ecd3;margin-right:8px;vertical-align:middle}

/* --- reveal / compare blocks --- */
.reveal{border:1px dashed var(--line);border-radius:12px;padding:16px 14px;text-align:center;background:rgba(0,0,0,.2)}
.reveal .rth{font-size:clamp(2.2rem,10vw,3.2rem);line-height:1.35;color:#f7ecd3}
.reveal .rq{font-size:.9rem;color:var(--ink-faint);margin-top:6px}
.reveal .ra{display:none}
.reveal.shown .ra{display:block}
.reveal.shown .rq{display:none}
.reveal .ra .rr{font-size:1.25rem;color:var(--gold-hi);font-weight:600;margin-top:6px}
.reveal .ra .rg{font-size:.9rem;color:var(--ink-dim);margin-top:2px}
.revbtn{margin-top:12px;font-family:inherit;font-size:.86rem;font-weight:700;cursor:pointer;
  padding:8px 20px;border-radius:99px;background:rgba(213,162,75,.12);border:1px solid var(--line);color:var(--gold-hi)}
.twoup{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
.upcard{border:1px solid var(--line-soft);border-radius:12px;padding:12px 10px;text-align:center;background:rgba(0,0,0,.2)}
.upcard .uth{font-size:2.4rem;line-height:1.3;color:#f7ecd3}
.upcard .ur{font-size:.95rem;color:var(--gold-hi);font-weight:600}
.upcard .ug{font-size:.8rem;color:var(--ink-faint);margin-top:1px}
.upcard .say{margin-top:7px}

/* --- tappable word parts / seams --- */
.tapstrip{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:12px}
.tapch{cursor:pointer;font-family:inherit;font-size:2rem;line-height:1.35;color:#f7ecd3;
  background:rgba(0,0,0,.2);border:1px solid var(--line-soft);border-radius:10px;padding:4px 12px;min-width:48px}
.tapch[aria-pressed="true"]{border-color:var(--gold);background:rgba(213,162,75,.14)}
.tapch.right{border-color:var(--teal);background:rgba(91,150,127,.16)}
.tapch.wrong{border-color:var(--lacquer);background:rgba(200,69,47,.14)}


/* ---------- tone machine: staged dials, word-first output ---------- */
.mrow{align-items:flex-start}
.mhint{flex-basis:100%;margin:6px 0 0 106px;font-size:.76rem;color:var(--ink-faint);line-height:1.45}
@media(max-width:460px){ .mlab{width:100%} .mhint{margin-left:0} }
.mopt small{display:block;font-size:.6rem;font-weight:400;letter-spacing:.02em;opacity:.8;margin-top:1px}
.mopt.thai{padding:5px 11px;line-height:1.15}
.mopt.thai span[lang]{font-size:1.2rem}
.mword{font-size:1.05rem;color:var(--ink);margin-bottom:8px}
.mword .th{font-size:1.9rem;color:#f7ecd3;vertical-align:middle;margin-right:4px}
.mword b{color:var(--gold-hi)}
.mword .mg{color:var(--ink-faint);font-size:.85rem}
.mword.mnone{font-size:.85rem;color:var(--ink-faint)}
.mout .mtone{font-size:1.5rem}
.mfixed{font-size:.74rem;color:var(--ink-faint);text-align:center;padding:8px 12px 0;line-height:1.5}