/* ===== Design system: "Friendly edtech" — pale canvas, white flat cards with hairline borders, gradient banners, one mint action colour, Golos Text. Light + dark. ===== */
@font-face{font-family:"Golos Text";font-weight:100 900;font-display:swap;src:url(../fonts/golos-text-cyrillic-wght-normal.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Golos Text";font-weight:100 900;font-display:swap;src:url(../fonts/golos-text-latin-wght-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --bg:#f2f7fd;--surface:#fff;--soft:#e8eff9;--ink:#14213d;--mute:#6b7894;--line:#e0e8f4;
  --mint:#1fe39a;--mint-d:#12c985;--mint-ink:#05291d;--ind:#4a2fd0;--ind-t:#4a2fd0;--sky:#3a6ef0;--cy:#27b5f5;--blue:#3a6ef0;--purple:#6a4be0;--orange:#ff8a3d;--red:#ff5a6a;--yellow:#ffc53d;--pink:#ef5b95;--green:#12c985;
  --lilac:var(--purple);--lime:var(--mint);
  --ok:#0a8a5f;--okbg:#e3f9f0;--okbd:#12c985;--bad:#d83a52;--badbg:#ffe9ec;--badbd:#ff5a6a;--warn:#fff4d1;
  --sel:#f1eefe;--selbd:#4a2fd0;--nav:#fff;--nav-ink:#8a96ad;--tint:#ece9fd;
  --mesh:radial-gradient(120% 90% at 100% 0%,rgba(255,125,205,.5),transparent 55%),radial-gradient(90% 80% at 0% 100%,rgba(31,227,154,.34),transparent 60%),radial-gradient(70% 60% at 60% 110%,rgba(39,181,245,.65),transparent 70%),linear-gradient(135deg,#4a2fd0 0%,#3a56e8 55%,#3a8cf0 100%);
  --r:22px;--r2:16px;--fs:1;--fd:"Golos Text",system-ui,sans-serif;--fb:"Golos Text",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
:root[data-theme=dark]{
  --bg:#0e1424;--surface:#172037;--soft:#1f2a45;--ink:#e9eefb;--mute:#93a0bd;--line:#26324f;
  --ind-t:#a99cff;--ok:#5fe3b4;--okbg:#10382f;--okbd:#12c985;--bad:#ff8c9a;--badbg:#3d1d29;--badbd:#ff5a6a;--warn:#3b3416;--sel:#241f52;--selbd:#8c7bff;--nav:#121a2e;--nav-ink:#8e9bb8;--tint:#2a2560}
@media(prefers-color-scheme:dark){:root[data-theme=system]{
  --bg:#0e1424;--surface:#172037;--soft:#1f2a45;--ink:#e9eefb;--mute:#93a0bd;--line:#26324f;
  --ind-t:#a99cff;--ok:#5fe3b4;--okbg:#10382f;--okbd:#12c985;--bad:#ff8c9a;--badbg:#3d1d29;--badbd:#ff5a6a;--warn:#3b3416;--sel:#241f52;--selbd:#8c7bff;--nav:#121a2e;--nav-ink:#8e9bb8;--tint:#2a2560}}
:root[data-density=compact]{--r:18px;--r2:14px}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{font-size:calc(16px*var(--fs));-webkit-text-size-adjust:100%}
html,body{height:100%;margin:0;overflow:hidden;overscroll-behavior:none;background:var(--bg);color:var(--ink);font-family:var(--fb);line-height:1.5;font-weight:450}
#shell{position:fixed;left:0;right:0;top:0;width:100%;height:var(--vvh,100dvh);transform:translateY(var(--vvt,0px));display:flex;flex-direction:column;max-width:760px;margin:0 auto}
#view{flex:1;min-height:0;display:flex;flex-direction:column}
.screen{flex:1;min-height:0;display:flex;flex-direction:column}
.scroll{overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;padding:calc(18px + env(safe-area-inset-top)) 16px calc(104px + env(safe-area-inset-bottom));gap:14px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.scroll>*{flex:none}
@media(min-width:760px){.scroll{padding-left:28px;padding-right:28px}}
h1,h2,h3,h4{margin:.2em 0;line-height:1.15;font-family:var(--fd);font-weight:700;letter-spacing:-.02em}
h1{font-size:clamp(1.6rem,6vw,2rem)}h2{font-size:1.4rem}h3{font-size:1.1rem}h4{font-size:.98rem}
.serif{font-family:var(--fd)}
.muted,small{color:var(--mute)}.muted{font-weight:500}p{margin:.4em 0}a{color:inherit}b,strong{font-weight:650}
.ico{display:inline-flex;vertical-align:middle;flex:none}

/* surfaces */
.card{position:relative;background:var(--surface);border-radius:var(--r);padding:18px;border:1px solid var(--line);min-width:0}
.card.empty{text-align:center;color:var(--mute);background:transparent;border-style:dashed}
.hero{position:relative;overflow:hidden;background:var(--mesh);color:#fff;border-radius:28px;padding:22px}
.hero h2{font-size:clamp(1.5rem,5.4vw,1.8rem);margin:.45em 0 .1em;max-width:72%;font-weight:700;letter-spacing:-.03em}.hero p{margin:.4em 0 1em;max-width:70%;opacity:.92}
.kicker{display:inline-block;font-size:.76rem;font-weight:600;background:rgba(255,255,255,.2);border-radius:999px;padding:5px 12px}
.hero .rg{position:absolute;right:18px;top:20px}
.rg{position:relative;display:grid;place-items:center;flex:none}.rg svg{position:absolute;inset:0;width:100%;height:100%}.rg b{position:relative;font-weight:700;line-height:1;text-align:center;color:#fff;letter-spacing:-.03em}.rg b small{display:block;font-size:.62rem;font-weight:500;opacity:.9;margin-top:2px;letter-spacing:0;color:#fff}
.hero.result{text-align:center}.hero.result p{max-width:none}.hero.result .rg{position:relative;right:auto;top:auto;margin:6px auto 0}
.pass{display:inline-flex;align-items:center;gap:6px;background:rgba(31,227,154,.25);border:1px solid rgba(31,227,154,.6);border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:600;color:#fff}
.hero .bigpct{font-size:2.6rem}

/* buttons: flat pills, one mint action colour */
.btn{font:inherit;font-weight:650;border:1.5px solid var(--line);border-radius:999px;padding:12px 24px;background:var(--surface);color:var(--ink-t,var(--ind-t));cursor:pointer;min-height:52px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:1rem;transition:transform .08s,filter .12s;touch-action:manipulation}
.btn:active:not(:disabled){transform:scale(.98)}
.btn.primary,.btn.light{background:var(--mint);border-color:var(--mint);color:var(--mint-ink)}
.btn.ghostw{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.55);color:#fff}
.btn.ghost{background:transparent;color:var(--mute)}
.btn.danger{background:var(--red);border-color:var(--red);color:#fff;margin-top:8px}
.btn.sm{min-height:42px;padding:6px 18px;font-size:.88rem}.btn.lg{min-height:56px;flex:1;font-size:1.05rem}.btn:disabled{opacity:.4;cursor:default}
.btn:focus-visible,.chip:focus-visible,.icon:focus-visible,.choice:focus-visible,.nav a:focus-visible,.lrow:focus-visible,.act:focus-visible,.answer:focus-visible,.speak:focus-visible,.opt:focus-visible,.gb:focus-visible{outline:3px solid var(--sky);outline-offset:2px}
.icon{font:inherit;background:var(--surface);border:1px solid var(--line);border-radius:50%;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;text-decoration:none;color:var(--mute);cursor:pointer;flex:none}
.icon:active{transform:scale(.95)}
/* rows of controls never leave an orphan pill hugging the left edge: wrapped items stretch to fill the row */
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.row>.btn,.row>.chip{flex:1 1 140px}.between{justify-content:space-between}.grow{flex:1;min-width:0}
.row.inline>*{flex:0 0 auto}
.chips{display:flex;gap:8px;flex-wrap:wrap;padding:2px 0}.chips>.chip{flex:1 1 auto;justify-content:center}
.chip{font:inherit;font-weight:550;font-size:.9rem;border:1px solid var(--line);background:var(--surface);color:var(--mute);border-radius:999px;padding:8px 18px;white-space:nowrap;text-decoration:none;cursor:pointer;min-height:42px;display:inline-flex;align-items:center;gap:6px}
.chip.on{background:var(--sel);border:1.5px solid var(--selbd);color:var(--ind-t);font-weight:650}
.chip.c1{background:var(--purple);color:#fff;border-color:var(--purple)}.chip.c2{background:var(--yellow);color:#14213d;border-color:var(--yellow)}.chip.c3{background:var(--mint);color:var(--mint-ink);border-color:var(--mint)}.chip.c4{background:var(--pink);color:#fff;border-color:var(--pink)}

/* headers */
.greet{display:flex;justify-content:space-between;align-items:center;gap:12px}.greet p{margin:0;font-weight:500;font-size:.88rem}.greet h1{margin:.05em 0 0}
.pills{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.pill-s,.streak{display:inline-flex;align-items:center;gap:6px;font-weight:650;font-size:.95rem;padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface)}.pill-s .ico,.streak .ico{font-size:1.15rem}
.pill-s.fire,.streak{color:var(--ink)}.pill-s.fire .ico,.streak .ico{color:var(--orange)}
.phead{display:flex;align-items:center;gap:12px}.phead h1{font-size:clamp(1.3rem,4.8vw,1.7rem);margin:0;min-width:0;overflow-wrap:anywhere}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grid2>:last-child:nth-child(odd){grid-column:1/-1}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.stat{text-align:left;overflow:hidden;padding:16px}.stat b{display:block;font-family:var(--fd);font-size:1.7rem;font-weight:700;letter-spacing:-.03em;line-height:1.1}.stat span{color:var(--mute);font-size:.84rem;font-weight:500}
.stat.c1 b{color:var(--purple)}.stat.c2 b{color:#d99a00}.stat.c3 b{color:var(--green)}.stat.c4 b{color:var(--pink)}.stat.c5 b{color:var(--blue)}.stat.c6 b{color:var(--orange)}
.ti{width:40px;height:40px;border-radius:14px;display:grid;place-items:center;color:#fff;flex:none;font-size:1.25rem;margin-bottom:12px}
.ti.blue{background:var(--blue)}.ti.vio{background:var(--purple)}.ti.org{background:var(--orange)}.ti.mint{background:var(--green)}.ti.pink{background:var(--pink)}
.stat .ti{margin-bottom:12px}
.pcard{display:flex;align-items:center;gap:12px;padding:12px;text-decoration:none;color:var(--ink)}.pcard .ti{margin:0;width:44px;height:44px}.pcard b{display:block;font-size:.95rem;font-weight:600}.pcard small{font-size:.8rem}
.pcard:active{transform:scale(.98)}
.bar{height:10px;background:var(--soft);border-radius:99px;overflow:hidden;flex:1;min-width:0}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--mint),var(--cy));border-radius:99px;transition:width .35s cubic-bezier(.3,.7,.3,1)}
.goal .bar{margin-top:10px}
.sec{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin:8px 2px 0}.sec b{font-size:1.05rem;font-weight:700}

/* lists */
.lgrid{display:grid;gap:10px;grid-template-columns:minmax(0,1fr)}@media(min-width:700px){.lgrid{grid-template-columns:repeat(2,minmax(0,1fr))}.lgrid>:last-child:nth-child(odd){grid-column:1/-1}}
.lrow{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:10px 14px 10px 10px;text-decoration:none;color:var(--ink);min-height:68px;min-width:0}
.lrow:active{transform:scale(.99)}
.lrow.cur{border:2px solid var(--selbd)}.lrow.exam{background:transparent;border-style:dashed}
.num{width:46px;height:46px;border-radius:15px;background:var(--blue);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem;flex:none}
.lrow:nth-child(5n+1) .num{background:var(--blue)}.lrow:nth-child(5n+2) .num{background:var(--purple)}.lrow:nth-child(5n+3) .num{background:var(--orange)}.lrow:nth-child(5n+4) .num{background:var(--green)}.lrow:nth-child(5n+5) .num{background:var(--pink)}
.ltxt{flex:1;min-width:0}.ltxt b,.ltxt small{display:block}.ltxt b{font-weight:600;line-height:1.25}.ltxt small{margin-top:2px;white-space:normal}
.badge{font-size:.72rem;font-weight:650;padding:4px 11px;border-radius:99px;background:var(--soft);color:var(--mute);white-space:nowrap}.badge.fu{background:var(--mint);color:var(--mint-ink)}.badge.lt{background:var(--yellow);color:#14213d}
.mod{margin:18px 2px 0;display:flex;align-items:center;gap:10px;font-size:1.05rem}
.act{text-align:left;font:inherit;color:var(--ink);cursor:pointer;display:block;width:100%}.act:active:not(:disabled){transform:scale(.99)}.act small{display:block;margin-top:2px}.act:disabled{opacity:.45}
.act.step{display:flex;gap:14px;align-items:center;padding:12px 14px}.act.step .num{background:var(--blue)}.act.step:nth-of-type(5n+2) .num{background:var(--purple)}.act.step:nth-of-type(5n+3) .num{background:var(--orange)}.act.step:nth-of-type(5n+4) .num{background:var(--green)}.act.step:nth-of-type(5n+5) .num{background:var(--pink)}.act.step .ltxt small{white-space:normal}
.goals{display:flex;flex-wrap:wrap;gap:8px}.goals span{flex:1 1 auto;justify-content:center;text-align:center;font-size:.85rem;font-weight:550;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:8px 14px}

/* notes */
.note{border-radius:var(--r2);padding:14px 16px;background:var(--soft);border:1px solid var(--line)}.note.ok,.note.okish{background:var(--okbg);border-color:var(--okbd)}.note.bad{background:var(--badbg);border-color:var(--badbd)}.note p{margin:.3em 0}.note b{font-weight:650}
.note.hintbox{background:var(--warn);border-color:var(--yellow)}
.okt{color:var(--ok)}.badt{color:var(--bad)}.why{font-weight:500}
.tw{overflow-x:auto;border-radius:var(--r2);background:var(--surface);border:1px solid var(--line)}table{border-collapse:collapse;width:100%}th,td{border-bottom:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top}th{background:var(--tint);font-weight:700;font-size:.74rem;color:var(--ind-t);text-transform:uppercase;letter-spacing:.05em}tr:last-child td{border-bottom:0}
.study h2{margin-bottom:.4em}.ex p{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:.5em 0}.ex b{font-size:1.04rem;font-weight:600}
.vrow{display:flex;gap:12px;padding:11px 0;border-bottom:1px solid var(--line);align-items:flex-start}.vrow:last-child{border-bottom:0}
.ipa{font-family:"Segoe UI",system-ui,sans-serif;color:var(--mute)}
.mist{border-left:4px solid var(--orange);padding:2px 0 2px 14px;margin:14px 0}.secrow{display:flex;justify-content:space-between;gap:8px;padding:9px 0;border-bottom:1px solid var(--line)}.secrow:last-child{border-bottom:0}
.set{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 12px;align-items:center;padding:13px 4px;border-bottom:1px solid var(--line)}.set span{min-width:0;flex:1 1 150px;overflow-wrap:anywhere}
.set input[type=checkbox]{appearance:none;-webkit-appearance:none;width:52px;height:32px;border-radius:99px;background:var(--line);position:relative;flex:none;cursor:pointer;transition:background .15s}
.set input[type=checkbox]::after{content:"";position:absolute;top:3px;left:3px;width:26px;height:26px;border-radius:50%;background:#fff;transition:transform .15s}
.set input[type=checkbox]:checked{background:var(--mint)}.set input[type=checkbox]:checked::after{transform:translateX(20px)}
.num-in,.sel,.answer{font:inherit;font-weight:550;font-size:16px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);border-radius:var(--r2);padding:11px 16px;min-height:50px}.num-in{width:110px}
.num-in:focus,.sel:focus,.answer:focus{outline:none;border-color:var(--selbd)}

/* session */
.session{padding:0;background:var(--bg)}
.shead{display:flex;gap:14px;align-items:center;padding:calc(14px + env(safe-area-inset-top)) 16px 6px}
.shead .icon{background:transparent;border:0;width:40px;height:40px;color:var(--mute)}
.shead .bar{height:10px}.shead .muted{font-weight:600;font-size:.85rem;white-space:nowrap}
.sbody{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;padding:12px 16px 16px;display:flex;flex-direction:column;gap:16px;-webkit-overflow-scrolling:touch;scroll-padding-bottom:20px}
.sbody>*{flex:none}
.q-card{padding:22px 20px}
.sfoot{display:flex;gap:10px;padding:12px 16px calc(16px + env(safe-area-inset-bottom));background:var(--bg)}
.sfoot .btn.ghost{flex:0 0 auto}.sfoot .btn.primary{flex:1}
.q{font-size:clamp(1.2rem,4.6vw,1.5rem);font-weight:650;margin:.35em 0;overflow-wrap:anywhere;line-height:1.3;letter-spacing:-.015em}
.sentence .gap{display:inline-block;min-width:3.2ch;border-bottom:3px solid var(--sky);color:transparent;margin:0 6px}
.src{font-size:1.08rem;padding:13px 16px;background:var(--soft);border-radius:var(--r2);font-weight:500}.src.hidden{display:none}.wrongsrc{color:var(--bad)}
.answer{width:100%;font-size:18px;margin-top:12px;border-radius:var(--r2)}.answer.ok{border-color:var(--okbd);background:var(--okbg)}.answer.bad{border-color:var(--badbd);background:var(--badbg)}.area{min-height:140px;resize:vertical}
.choices{display:grid;gap:10px;margin-top:12px}
.choice{font:inherit;font-weight:550;text-align:left;background:var(--surface);color:var(--ink);border:1.5px solid var(--line);border-radius:999px;padding:12px 22px;min-height:56px;cursor:pointer;display:flex;align-items:center;gap:12px;font-size:1.04rem;transition:transform .08s}
.choice:active:not(:disabled){transform:scale(.99)}
.choice.sel{background:var(--sel);border:2px solid var(--selbd);color:var(--ind-t);font-weight:650}
.choice.right{background:var(--okbg);border:2px solid var(--okbd);color:var(--ok);font-weight:650}.choice.wrong{background:var(--badbg);border:2px solid var(--badbd);color:var(--bad);font-weight:650}
.choice:disabled{cursor:default}.row>.choice{flex:1 1 220px}
.bank,.built{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;min-height:50px}.bank{justify-content:center}.built{border-bottom:1.5px solid var(--line);padding-bottom:12px;min-height:58px;align-items:center}
.bank .chip,.built .chip{flex:0 0 auto}.bank .chip:disabled{opacity:.25}.built .chip.on{background:var(--sel);border:1.5px solid var(--selbd);color:var(--ind-t)}
.pill{display:inline-block;font-size:.76rem;font-weight:650;background:var(--tint);color:var(--ind-t);border-radius:999px;padding:5px 12px;margin-bottom:8px}.pill.new{background:var(--okbg);color:var(--ok)}
.tk.bad{background:var(--badbg);color:var(--bad);border-radius:6px;padding:0 4px;text-decoration:line-through}.diff{margin:.3em 0}
.feedback:empty{display:none}.feedback .note{display:block}
.fb{display:flex;gap:14px;align-items:flex-start}.fbic{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;flex:none;color:#fff;font-size:1.4rem}.fbic.ok{background:var(--green)}.fbic.bad{background:var(--red)}.fb .fbt{flex:1;min-width:0}
.q-card.in{animation:in .26s cubic-bezier(.3,.8,.3,1)}@keyframes in{from{opacity:0;transform:translateY(14px)}}
.feedback .note{animation:pop .22s cubic-bezier(.3,.9,.4,1.1)}@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}}
.shake{animation:sh .35s}@keyframes sh{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@media(hover:hover){.choice:hover:not(:disabled):not(.right):not(.wrong):not(.sel){background:var(--soft)}.lrow:hover,.btn:hover:not(:disabled),.pcard:hover{filter:brightness(1.03)}}
:root[data-anim=off] *{animation:none!important;transition:none!important}@media(prefers-reduced-motion:reduce){:root[data-anim=system] *{animation:none!important;transition:none!important}}

/* bottom nav: flat bar, active = indigo with a top indicator */
.nav{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:space-around;background:var(--nav);border-top:1px solid var(--line);padding:10px 4px calc(10px + env(safe-area-inset-bottom));z-index:5}
.nav a{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;text-decoration:none;color:var(--nav-ink);font-size:.68rem;font-weight:600;flex:1;max-width:84px;min-height:52px;padding:2px 0}
.nav a b{font-weight:600}.nav a.on{color:var(--ind-t)}.nav a.on::before{content:"";position:absolute;top:-10px;width:26px;height:3px;border-radius:0 0 3px 3px;background:linear-gradient(90deg,#4a2fd0,#3a8cf0)}
body.in-session .nav,body.kb .nav{display:none}

/* calendar & misc */
.cal{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px;margin-top:12px;text-align:center}.cal small{font-weight:500}
.cd{aspect-ratio:1;border:0;border-radius:50%;background:var(--soft);color:var(--ink);font:inherit;font-weight:550;min-height:0;padding:0;cursor:pointer}.cd.empty{background:transparent;cursor:default}
.cd.ok{background:var(--orange);color:#fff}.cd.part{background:color-mix(in srgb,var(--orange) 35%,var(--soft))}.cd.rest{outline:2px dashed var(--mute)}.cd.today{box-shadow:0 0 0 3px var(--sky) inset}
.week{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 8px}
.wd{text-align:center;font-weight:600;font-size:.74rem;color:var(--mute);text-transform:uppercase}.wd i{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;margin:5px auto 0;background:var(--soft);color:#fff;font-size:.95rem}.wd.on i{background:var(--orange)}.wd.t i{border:2.5px solid var(--orange);background:var(--surface);color:var(--orange)}
.filters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.filters .answer{margin:0;grid-column:1/-1}.filters>:last-child:nth-child(even):not(.answer){grid-column:1/-1}.filters .selbtn{max-width:none;width:100%}
.levels{display:grid;gap:10px;margin-top:12px}.lv{display:grid;grid-template-columns:40px 1fr 78px;gap:12px;align-items:center}.lv small{text-align:right}
details summary{cursor:pointer;font-weight:650;list-style:none}details summary::-webkit-details-marker{display:none}details summary::after{content:" +";color:var(--mute)}details[open] summary::after{content:" –"}

/* word cards */
.wcard{display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:10px 14px;min-width:0}
.wcard .w{font-family:var(--fd);font-weight:650;font-size:1.1rem;overflow-wrap:anywhere;line-height:1.2}
.wcard .meta{display:flex;gap:6px;flex-wrap:wrap;margin-top:5px;align-items:center}
.wcard .ru{font-weight:500;margin-top:4px;line-height:1.25}
.tag{font-size:.7rem;font-weight:650;padding:3px 10px;border-radius:99px;background:var(--soft);color:var(--mute);text-decoration:none}
.tag.A1{background:var(--green);color:#fff}.tag.A2{background:var(--blue);color:#fff}.tag.B1{background:var(--yellow);color:#14213d}.tag.B2{background:var(--orange);color:#fff}.tag.C1{background:var(--purple);color:#fff}
.speak{width:44px;height:44px;border-radius:50%;border:0;background:var(--blue);color:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;flex:none;padding:0}.speak:active{transform:scale(.94)}
.wlist{display:grid;gap:10px}@media(min-width:700px){.wlist{grid-template-columns:repeat(2,minmax(0,1fr))}.wlist>:last-child:nth-child(odd){grid-column:1/-1}}
.bigword{font-family:var(--fd);font-weight:700;font-size:clamp(2.2rem,9vw,3.2rem);letter-spacing:-.04em;line-height:1.05;overflow-wrap:anywhere}
.skel-art{display:flex;justify-content:center;margin:6px 0;color:var(--mute);font-size:3rem}
@media(max-width:380px){.hero p,.hero h2{max-width:100%}.hero .rg{display:none}.grid3{gap:8px}.stat b{font-size:1.45rem}}

/* flashcards */
.flashcard{display:flex;flex-direction:column;gap:18px;align-items:center;text-align:center;padding:10px 0 6px}
.cfront{display:flex;flex-direction:column;gap:10px;align-items:center}.cfront .bigword{font-size:clamp(2rem,9vw,3.2rem)}
.cback{display:flex;flex-direction:column;gap:8px;align-items:center;border-top:1.5px dashed var(--line);padding-top:16px;width:100%}.cback.hidden,.grades.hidden{display:none}
.cans{font-family:var(--fd);font-size:clamp(1.5rem,6vw,2rem);font-weight:700}.cex{font-weight:500;margin:.2em 0}
.grades{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;width:100%}.btn.grade{padding:10px 4px;min-height:58px;font-size:.84rem;border-radius:18px;border:0}
.btn.grade.g0{background:#ffe3ea;color:#c0305a}.btn.grade.g1{background:#ffeccf;color:#b8620a}.btn.grade.g2{background:#d9f8ea;color:#0a8a5f}.btn.grade.g3{background:#dcebff;color:#2456c4}
:root[data-theme=dark] .btn.grade.g0{background:#47202d;color:#ff9db1}:root[data-theme=dark] .btn.grade.g1{background:#463318;color:#ffc27a}:root[data-theme=dark] .btn.grade.g2{background:#10382f;color:#5fe3b4}:root[data-theme=dark] .btn.grade.g3{background:#1b2f55;color:#8bb5ff}
.sfoot [hidden]{display:none}

/* custom select + bottom sheet */
.selbtn{display:inline-flex;align-items:center;justify-content:space-between;gap:10px;text-align:left;cursor:pointer;max-width:58%;color:var(--ink)}.selbtn.wide{max-width:100%;width:100%}.selbtn .selval{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.selbtn .ico{color:var(--mute)}
.selbtn:active{transform:scale(.98)}
.sheet-back{position:fixed;inset:0;z-index:60;background:rgba(14,20,36,.5);display:flex;align-items:flex-end;justify-content:center;animation:fade .18s}
.sheet{width:100%;max-width:560px;max-height:min(78dvh,640px);display:flex;flex-direction:column;background:var(--surface);color:var(--ink);border-radius:28px 28px 0 0;padding:6px 12px calc(12px + env(safe-area-inset-bottom));animation:slideup .22s cubic-bezier(.3,.8,.3,1)}
.sheet-h{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 6px 8px;font-size:1.05rem}.sheet-h .icon{border:0;width:40px;height:40px;background:transparent}
.opts{overflow-y:auto;display:flex;flex-direction:column;gap:6px;padding:2px 2px 6px;-webkit-overflow-scrolling:touch}
.opt{flex:none;font:inherit;font-weight:550;text-align:left;background:transparent;color:var(--ink);border:1.5px solid transparent;border-radius:16px;padding:13px 16px;min-height:50px;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px}
.opt:hover{background:var(--soft)}.opt.on{background:var(--sel);border-color:var(--selbd);color:var(--ind-t);font-weight:650}
@media(min-width:760px){.sheet-back{align-items:center}.sheet{border-radius:28px;padding-bottom:12px}}
@keyframes fade{from{opacity:0}}@keyframes slideup{from{transform:translateY(40px);opacity:0}}

/* standalone buttons fill their container (no lonely button hugging the left edge) */
.btn{display:flex;width:100%}
.row>.btn,.row>.chip,.sfoot>.btn,.filepick .btn,.cta .btn,.hero .row>.btn{width:auto}
.btn.sm{display:inline-flex;width:auto}.card>.btn.sm,.note>.btn.sm,.sect>.btn.sm{display:flex;width:100%}
.stat .ti,.stat span.ti{color:#fff}
.ti.sm{width:34px;height:34px;border-radius:12px;margin:0;font-size:1.05rem}
/* settings */
.sect{padding:16px 16px 6px}.sect>.btn{margin:8px 0 10px}.sect p{margin:.2em 0 .6em}
.shd{display:flex;align-items:center;gap:10px;margin-bottom:4px}.shd h3{margin:0}
.set .lbl{flex:1 1 200px;min-width:0}.set .lbl b{display:block;font-weight:600;font-size:.98rem;line-height:1.25}.set .lbl small{display:block;margin-top:2px;font-size:.82rem;line-height:1.35}
.set:last-child{border-bottom:0}.num-in.wide{width:100%;flex:1 1 100%}
.stepper{display:inline-flex;align-items:center;border:1.5px solid var(--line);border-radius:999px;background:var(--surface);flex:none;overflow:hidden}
.step-btn{font:inherit;border:0;background:transparent;color:var(--ind-t);width:44px;height:44px;display:grid;place-items:center;cursor:pointer}.step-btn:active{background:var(--soft)}
.step-val{font:inherit;font-weight:650;font-size:16px;text-align:center;width:64px;border:0;background:transparent;color:var(--ink);padding:0;height:44px}.step-val:focus{outline:none;background:var(--soft)}
/* file picker */
.filepick{display:flex;align-items:center;gap:12px;flex-wrap:wrap;position:relative;cursor:pointer;margin:6px 0}.file-name{font-size:.88rem;overflow-wrap:anywhere;min-width:0}
.file-hidden{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}
.filepick:focus-within .btn{outline:3px solid var(--sky);outline-offset:2px}
p>.btn,p>.btn.sm{display:flex;width:100%}

/* ===== responsive system (320px → 1440px) ===== */
.btn{line-height:1.2;text-align:center;white-space:normal;padding:12px 20px}
/* groups made only of buttons: one column on phones, two equal columns when there is room, odd last button spans the row */
.row:not(:has(>:not(.btn))){display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.row:not(:has(>:not(.btn)))>.btn{width:100%;flex:none}
.row:not(:has(>:not(.btn))):not(:has(>.btn:not(.sm))){grid-template-columns:repeat(2,minmax(0,1fr))}
@media(min-width:560px){.row:not(:has(>:not(.btn))){grid-template-columns:repeat(2,minmax(0,1fr))}}
.row:not(:has(>:not(.btn)))>.btn:last-child:nth-child(odd){grid-column:1/-1}
.row:not(:has(>:not(.btn)))>.btn:only-child{grid-column:1/-1}
.hero .row:not(:has(>:not(.btn))){margin-top:4px}
/* reading width: centred column on tablets and desktops */
@media(min-width:760px){
  .scroll{padding-left:max(28px,calc((100% - 720px)/2));padding-right:max(28px,calc((100% - 720px)/2))}
  .shead,.sfoot{padding-left:max(20px,calc((100% - 640px)/2));padding-right:max(20px,calc((100% - 640px)/2))}
  .sbody{padding-left:max(20px,calc((100% - 640px)/2));padding-right:max(20px,calc((100% - 640px)/2))}
  #shell{max-width:100%}
  .nav{left:50%;right:auto;width:min(720px,calc(100% - 40px));transform:translateX(-50%);bottom:14px;border:1px solid var(--line);border-radius:24px;padding:8px 10px}
  .nav a.on::before{display:none}.nav a.on{background:var(--sel);border-radius:16px}
}
/* desktop: sidebar navigation + wider content */
@media(min-width:1024px){
  #shell{display:grid;grid-template-columns:240px minmax(0,1fr);grid-template-rows:minmax(0,1fr);max-width:1400px}
  #view{grid-column:2;grid-row:1}
  .nav{position:static;transform:none;grid-column:1;grid-row:1;width:auto;flex-direction:column;justify-content:flex-start;gap:6px;border:0;border-right:1px solid var(--line);border-radius:0;padding:28px 14px;background:transparent;z-index:1}
  .nav a{flex:none;flex-direction:row;justify-content:flex-start;gap:14px;max-width:none;min-height:50px;padding:0 16px;font-size:.98rem;border-radius:16px}
  .nav a .ico{font-size:1.2rem}
  .scroll{padding:36px max(32px,calc((100% - 880px)/2)) 48px}
  .lgrid,.wlist{grid-template-columns:repeat(2,minmax(0,1fr))}
  body.in-session #shell{display:flex}
  body.in-session #view{width:100%}
}

.ex p.exl{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:center;margin:.6em 0}.exs b,.exs small{display:block}.exs small{margin-top:1px}
.ltxt,.ltxt b,.ltxt small,.pcard b,.pcard small,.stat span,.lbl b,.lbl small,h1,h2,h3,h4,.q,.tag,.kicker,.badge{overflow-wrap:anywhere;hyphens:auto}
.pcard>div,.lrow>.ltxt,.l .t{min-width:0}
.ti .ico,.stat .ti .ico{color:#fff}
.set .lbl{flex:1 1 130px}
.set .selbtn{min-width:150px;width:auto;max-width:100%;flex:0 1 auto}
.set .stepper{margin-left:auto}
.set .selbtn{min-width:176px}

/* ===== radius system: rounded rectangles, not pills ===== */
:root{--r:18px;--r2:14px;--rb:14px;--rc:12px;--rt:8px}
.card,.lrow,.wcard,.week,.tw,.note{border-radius:var(--r)}.note{border-radius:var(--r2)}
.hero{border-radius:24px}.mod{border-radius:var(--r)}
.btn,.btn.grade,.choice,.num-in,.sel,.answer,.stepper,.filepick .btn{border-radius:var(--rb)}
.chip,.icon,.pill-s,.streak,.goals span,.pass,.opt,.speak,.shead .icon,.btn.ghostw{border-radius:var(--rc)}
.kicker,.tag,.badge,.pill{border-radius:var(--rt)}
.bar,.bar i{border-radius:5px}
.fbic{border-radius:var(--rc)}.ti{border-radius:12px}.num{border-radius:14px}
.wd i,.cd{border-radius:10px}.wd.t i{border-width:2px}
.sheet{border-radius:24px 24px 0 0}@media(min-width:760px){.sheet{border-radius:24px}.nav{border-radius:18px}}
.set input[type=checkbox]::after{border-radius:50%}
/* feedback panel: title, text and the listen button are stacked with room between them */
.fbt{display:flex;flex-direction:column;align-items:flex-start;gap:6px}.fbt>b{font-size:1.1rem;line-height:1.2}.fbt>p{margin:0}.fbt>.btn{margin-top:6px;width:auto;align-self:flex-start;padding:8px 18px}
.fb{gap:14px}