/* Light and cheerful by default; the 🌙 button in the header switches to dark. --ac / --acd are set per language by app.js. */
:root{
  --bg:#fffaf3; --card:#ffffff; --ink:#2b2320; --muted:#7a6c62; --line:#f0e4d4;
  --accent:var(--ac,#d9482f); --accent-ink:#ffffff; --blue:#2563a8; --green:#2f8a57; --gold:#b9770e;
  --local-bg:#fff3dc; --local-line:#f3d79c; --tint:color-mix(in srgb,var(--accent) 9%,#fff);
  --shadow:0 2px 12px rgba(120,80,30,.09); --shadow-lg:0 8px 22px rgba(120,80,30,.14);
  --page:linear-gradient(180deg,#ffeedb 0,#fffaf3 340px);
  --script:"Noto Sans Lao","Leelawadee UI","Lao UI","Phetsarath OT",system-ui,sans-serif;
}
:root[data-theme="dark"]{
  --bg:#16120f; --card:#211b17; --ink:#f3ece4; --muted:#a79a8d; --line:#3a2f27;
  --accent:var(--acd,#e2665a); --accent-ink:#1a0f0d; --blue:#6aa8ee; --green:#6ccb90; --gold:#e3b04d;
  --local-bg:#33261a; --local-line:#6b4d2a; --tint:color-mix(in srgb,var(--accent) 14%,#211b17);
  --shadow:none; --shadow-lg:none; --page:none;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg) var(--page) no-repeat;color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif}
.lao{font-family:var(--script)}
a{color:var(--blue)}
.top{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:10px 18px;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);box-shadow:var(--shadow);position:sticky;top:0;z-index:5}
.brand{font:700 22px var(--script);color:var(--accent);text-decoration:none}
.brand span{font:700 16px system-ui;color:var(--ink);margin-left:4px}
.top nav{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.top nav a{padding:7px 14px;border-radius:999px;text-decoration:none;color:var(--muted);font-weight:600;transition:background .12s}
.top nav a:not(.on):hover{background:var(--tint)}
.top nav a.on{background:var(--accent);color:var(--accent-ink);box-shadow:0 2px 8px color-mix(in srgb,var(--accent) 40%,transparent)}
@media(max-width:760px){
  .top{gap:8px 10px;padding:8px 12px}
  .top nav{order:5;flex:1 0 100%;flex-wrap:nowrap;overflow-x:auto;gap:2px;scrollbar-width:none}
  .top nav a{white-space:nowrap;padding:6px 12px}
  h1,.hero h1{font-size:26px}.hero{padding:18px}
  .ring{width:84px;height:84px}.ring b{width:64px;height:64px;font-size:18px}
}
#themeBtn{font-size:20px;border-radius:999px}
#themeBtn.ico:not(.on){filter:none}
.toggle{font-size:14px;color:var(--muted);display:flex;gap:6px;align-items:center;cursor:pointer}
#dueBadge:not(:empty){background:var(--gold);color:#fff;border-radius:10px;padding:0 7px;font-size:12px;margin-left:4px}
main{max-width:960px;margin:0 auto;padding:24px 16px 60px}
footer{max-width:920px;margin:0 auto;padding:0 16px 40px;color:var(--muted);font-size:13px}
h1{font-size:32px;line-height:1.2;margin:6px 0 6px;letter-spacing:-.01em} h2{font-size:22px;margin:34px 0 4px}
.sub{color:var(--muted);margin:0 0 16px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow)}
a.unit,.card.unit{display:block;text-decoration:none;color:inherit;transition:transform .14s,box-shadow .14s}
a.unit:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.unit .ic{font-size:26px;width:48px;height:48px;border-radius:50%;background:var(--tint);display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.unit h3{margin:4px 0 2px;font-size:18px}
.bar{height:8px;background:var(--line);border-radius:999px;overflow:hidden;margin-top:12px}
.bar i{display:block;height:100%;background:var(--green);border-radius:999px}
.small{font-size:13px;color:var(--muted)}
.intro{background:var(--tint);border:1px solid color-mix(in srgb,var(--accent) 22%,transparent);border-radius:16px;padding:14px 16px;margin:10px 0 18px}
.btn{display:inline-block;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:9px 18px;border-radius:999px;font:600 15px system-ui;cursor:pointer;text-decoration:none;box-shadow:var(--shadow);transition:transform .1s,filter .1s}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn:hover{filter:brightness(.97);transform:translateY(-1px)}
.hero{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--tint);border:1px solid color-mix(in srgb,var(--accent) 22%,transparent);border-radius:24px;padding:24px 26px;margin-bottom:8px}
.hero h1{font-size:34px;margin-top:0}
.hero .sub{max-width:560px;margin-bottom:12px}
.ring{--p:0;width:104px;height:104px;border-radius:50%;background:conic-gradient(var(--accent) calc(var(--p)*1%),color-mix(in srgb,var(--accent) 16%,transparent) 0);display:flex;align-items:center;justify-content:center;flex:none}
.ring b{width:80px;height:80px;border-radius:50%;background:var(--card);display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:22px;line-height:1.1}
.ring b small{font-size:11px;font-weight:500;color:var(--muted)}
details.tip{margin:14px 0 4px}
details.tip>summary{cursor:pointer;color:var(--muted);font-weight:600;font-size:14px;padding:4px 0}
details.tip .intro{margin-top:8px}
.row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.phrase{display:grid;grid-template-columns:1fr;gap:8px;margin-bottom:12px}
.phrase .en{font-weight:600}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media(max-width:620px){.cols{grid-template-columns:1fr}}
.box{border-radius:14px;padding:12px 14px;border:1px solid var(--line);background:color-mix(in srgb,var(--bg) 70%,var(--card))}
.box.local{background:var(--local-bg);border-color:var(--local-line)}
.tag{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:700}
.box.local .tag{color:var(--gold)}
.big{font:600 24px/1.4 var(--script)}
.rom{color:var(--blue);font-style:italic}
body.norom .rom{display:none}
.note{font-size:14px;color:var(--muted);margin-top:4px}
.ico{border:0;background:none;cursor:pointer;font-size:18px;padding:2px 6px}
.ico.on{filter:none}.ico:not(.on){filter:grayscale(1) opacity(.5)}
a.ico.hear{text-decoration:none;font-size:16px;vertical-align:middle;filter:none;opacity:.8}
.flash{min-height:250px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer;gap:6px;user-select:none}
.flash .big{font-size:40px}
.opt{display:block;width:100%;text-align:left;margin:8px 0;padding:14px 16px;font:500 17px var(--script);border:2px solid var(--line);border-radius:16px;background:var(--card);color:var(--ink);cursor:pointer;box-shadow:var(--shadow);transition:transform .1s,border-color .1s}
.opt:hover:not(:disabled){border-color:var(--accent);transform:translateY(-1px)}
.opt.ok{background:var(--green);color:#fff;border-color:var(--green)}
.opt.bad{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.alpha{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.alpha .card{text-align:center;padding:10px}
.alpha .glyph{font:700 44px/1.2 var(--script);color:var(--accent)}
.cls{display:inline-block;font-size:11px;font-weight:700;padding:1px 7px;border-radius:8px;color:#fff}
.cls.H{background:#b8472f}.cls.M{background:#2e7d4f}.cls.L{background:#1f5fa8}
.crumb{font-size:14px;margin-bottom:6px}
.brand b{font:700 22px var(--script)}
.langsel{font:600 14px system-ui;padding:6px 8px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--ink)}
.kgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;max-width:560px}
.kgrid.three{grid-template-columns:repeat(3,1fr);max-width:340px}
.kc{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:6px 2px;text-align:center}
.kc .g{font:600 28px/1.2 var(--script);color:var(--accent)}
.kc .r{font-size:13px;color:var(--blue)}
.kc.empty{background:none;border-style:dashed;opacity:.35}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.kanji{font:700 48px/1.1 var(--script);color:var(--accent)}
h2[id]{scroll-margin-top:110px}
.clip{display:inline-flex;gap:2px;vertical-align:middle}
.clip .ico{font-size:16px}
.ico.recording{background:#c0392b;color:#fff;border-radius:6px;animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}
code{background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:0 4px;font-size:13px}
.winput{width:100%;padding:12px 14px;font:500 22px var(--script);border:2px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}
.winput:focus{outline:none;border-color:var(--blue)}
.winput.ok{border-color:var(--green)}.winput.bad{border-color:var(--accent)}
.feedback{color:var(--accent);font-weight:600;margin:4px 0}
.hintbox{border-left:4px solid var(--gold);margin-top:10px}
.hint{font:600 26px/1.4 var(--script);letter-spacing:.05em}
.okcard{border-left:4px solid var(--green);margin-top:10px}.revealcard{border-left:4px solid var(--accent);margin-top:10px}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* Sound tips on lesson pages */
.tipsbox{background:var(--local-bg);border:1px solid var(--local-line);border-radius:16px;padding:12px 16px;margin:10px 0 14px}
.tipsbox .tipshead{font-weight:700;color:var(--gold)}
.tipsbox ul{margin:6px 0 4px;padding-left:20px}
.tipsbox li{margin:5px 0;font-size:15px}
.tipsbox details{margin-top:6px}
.tipsbox summary{cursor:pointer;color:var(--muted);font-weight:600;font-size:14px}

/* Mouth diagrams (diagrams.js) */
:root{--skin:#f6dcc8}
:root[data-theme="dark"]{--skin:#8a6a58}
.mdiag{margin:6px 0 4px;max-width:300px}
.mdiag figcaption{font-size:13px;color:var(--muted);margin-top:2px}
.md{width:100%;height:auto;background:var(--card);border:1px solid var(--local-line);border-radius:12px;display:block}
.md .skin{fill:var(--skin);stroke:var(--ink);stroke-width:2.5;stroke-linejoin:round}
.md .nasal{fill:#fff;opacity:.5}
.md .cav{fill:#c96a6a;opacity:.5}
.md .roof{fill:none;stroke:#8a4a3a;stroke-width:3;stroke-linecap:round}
.md .wall{fill:none;stroke:#8a4a3a;stroke-width:2;stroke-linecap:round}
.md .velum{fill:#e58a8a;stroke:#b85a5a;stroke-width:1.5}
.md .tbody{fill:#f4a3a3;stroke:#c2605f;stroke-width:2}
.md .humpfill{fill:#f4a3a3}
.md .humpline{fill:none;stroke:#c2605f;stroke-width:2;stroke-linecap:round}
.md .tooth{fill:#fff;stroke:#777;stroke-width:1.5}
.md .lip{fill:#e0605b;stroke:#a83a37;stroke-width:2}
.md .mlab{font:600 10px system-ui;fill:#6b3a3a}
.md .mtxt{font:600 12px system-ui;fill:var(--muted)}
.md .air path{fill:none;stroke:var(--blue);stroke-width:3.5;stroke-linecap:round}
.md .air{opacity:0}
.md .nair{fill:none;stroke:var(--blue);stroke-width:3;stroke-linecap:round;stroke-dasharray:6 6;opacity:0}
.md .tongue{transform-origin:62px 176px}
.md .touch{fill:var(--gold);stroke:#fff;stroke-width:1.5;opacity:0}
.md .mbar{fill:var(--accent)}
.md .mgap{fill:none;stroke:var(--muted);stroke-width:2.5;stroke-dasharray:6 5}
.md .play{stroke:var(--ink);stroke-width:2.5}
@keyframes md-uclose{0%,25%{transform:translateY(8px)}28%,100%{transform:translateY(0)}}
@keyframes md-lclose{0%,25%{transform:translateY(-8px)}28%,100%{transform:translateY(0)}}
@keyframes md-air{0%,26%{opacity:0;transform:translateX(0)}30%{opacity:1}60%,100%{opacity:0;transform:translateX(14px)}}
.md-puff .ulip{animation:md-uclose 3s infinite}.md-puff .llip{animation:md-lclose 3s infinite}.md-puff .air{animation:md-air 3s infinite}
@keyframes md-uhold{0%,15%{transform:translateY(0)}30%,75%{transform:translateY(8px)}90%,100%{transform:translateY(0)}}
@keyframes md-lhold{0%,15%{transform:translateY(0)}30%,75%{transform:translateY(-8px)}90%,100%{transform:translateY(0)}}
@keyframes md-fade{0%,28%{opacity:0}35%,75%{opacity:1}90%,100%{opacity:0}}
.md-held .ulip{animation:md-uhold 3s infinite}.md-held .llip{animation:md-lhold 3s infinite}.md-held .held-txt{animation:md-fade 3s infinite}
@keyframes md-retro{0%,10%{transform:none}35%,75%{transform:translate(-8px,0) rotate(-13deg)}100%{transform:none}}
@keyframes md-touch{0%,30%{opacity:0}38%,75%{opacity:1}85%,100%{opacity:0}}
.md-retro .tongue{animation:md-retro 3s infinite}.md-retro .touch{animation:md-touch 3s infinite}
@keyframes md-hump{0%,10%{transform:translateY(0)}35%,75%{transform:translateY(-26px)}100%{transform:translateY(0)}}
@keyframes md-nair{0%,30%{opacity:0;stroke-dashoffset:0}40%,75%{opacity:1;stroke-dashoffset:-24}90%,100%{opacity:0}}
.md-ng .hump{animation:md-hump 3s infinite}.md-ng .touch{animation:md-touch 3s infinite}.md-ng .nair{animation:md-nair 3s linear infinite}
@keyframes md-tt{0%{transform:none}4%{transform:rotate(-9deg)}8%{transform:none}38%{transform:none}42%{transform:rotate(-9deg)}46%{transform:none}50%{transform:rotate(-9deg)}54%{transform:none}58%{transform:rotate(-9deg)}62%{transform:none}66%{transform:rotate(-9deg)}70%{transform:none}100%{transform:none}}
@keyframes md-t1{0%,30%{opacity:1}35%,100%{opacity:0}}
@keyframes md-t2{0%,34%{opacity:0}40%,75%{opacity:1}85%,100%{opacity:0}}
.md-taptrill .tongue{animation:md-tt 3s infinite}.md-taptrill .t1{animation:md-t1 3s infinite}.md-taptrill .t2{animation:md-t2 3s infinite}
@keyframes md-rl{0%,15%{transform:translate(0,0)}35%,75%{transform:translate(9px,4px)}100%{transform:translate(0,0)}}
@keyframes md-rl2{0%,15%{transform:translate(0,0)}35%,75%{transform:translate(9px,-4px)}100%{transform:translate(0,0)}}
.md-round .ulip{animation:md-rl 3s infinite}.md-round .llip{animation:md-rl2 3s infinite}
@keyframes md-play{0%{transform:translateX(0)}100%{transform:translateX(212px)}}
.md-pause .play{animation:md-play 3s linear infinite}
@media(prefers-reduced-motion:reduce){.md *{animation:none!important}.md .air{opacity:1}}
/* Tutor avatar (bottom corner; moves its mouth while audio plays) */
.tutor{position:fixed;right:14px;bottom:14px;width:78px;height:78px;z-index:7;cursor:pointer;filter:drop-shadow(0 4px 10px rgba(0,0,0,.2));transition:width .15s,height .15s}
.tutor.mini{width:42px;height:42px}
.tutor svg{width:100%;height:100%;display:block}
.tutor .face{fill:var(--accent)}
.tutor .cheek{fill:#fff;opacity:.28}
.tutor .eye{fill:#fff;transform-box:fill-box;transform-origin:center;animation:blink 4.5s infinite}
.tutor .pupil{fill:#2b2320}
.tutor .smile{fill:none;stroke:#2b2320;stroke-width:3.5;stroke-linecap:round}
.tutor .mouth{fill:#4a1f1a}
.tutor .tng{fill:#f0908f}
.tutor:not(.talking) .mouth,.tutor:not(.talking) .tng{display:none}
.tutor.talking .smile{display:none}
.tutor.talking{animation:bob .55s ease-in-out infinite}
@keyframes blink{0%,93%,100%{transform:scaleY(1)}96%{transform:scaleY(.1)}}
@keyframes bob{50%{transform:translateY(-4px)}}
@media(max-width:760px){.tutor{width:60px;height:60px;right:8px;bottom:8px}.tutor.mini{width:36px;height:36px}}
@media(prefers-reduced-motion:reduce){.tutor.talking,.tutor .eye{animation:none}}

/* Talk: role-play conversations */
.chat{display:flex;flex-direction:column;gap:10px;margin:10px 0}
.msg{max-width:88%}.msg.them{align-self:flex-start}.msg.me{align-self:flex-end}
.msg .who{font-size:12px;color:var(--muted);margin:0 6px 2px}.msg.me .who{text-align:right}
.msg .bub{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:10px 14px;box-shadow:var(--shadow)}
.msg.them .bub{border-bottom-left-radius:6px}.msg.me .bub{border-bottom-right-radius:6px}
.msg.me .bub{background:var(--local-bg);border-color:var(--local-line)}
.msg .big{font-size:20px}.en2{font-size:14px;color:var(--muted);margin-top:2px}
.goal{border-left:4px solid var(--blue);margin:8px 0}