/* Layout concept: the whole site is a worked solution in a school notebook (Дано, Решение, Ответ).
   Light = graph paper, green ink, lime highlighter, red teacher pen. Dark = chalkboard. */
:root{
  --bg:#F3F1E7;--grid:rgba(18,57,42,.07);--ink:#12392A;--text:#23352B;--muted:#53655A;
  --card:#FFFDF6;--soft:#E3EBDA;--line:#12392A;--lime:#C6F52E;--lime-ink:#0F2E20;
  --red:#C8372B;--deep:#12392A;--on-deep:#E8F3E3;--btn:#12392A;--btn-fg:#F3F1E7;--ok:#1B7F46;
  --f-display:Unbounded,"Arial Black",system-ui,sans-serif;--f-body:Onest,system-ui,sans-serif;--f-hand:Caveat,"Comic Sans MS",cursive;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0E2118;--grid:rgba(232,243,227,.06);--ink:#E8F3E3;--text:#D6E6DA;--muted:#9CB4A4;
  --card:#16302A;--soft:#1C3B2D;--line:#6E9A82;--red:#FF8F80;--deep:#1D4030;--btn:#E8F3E3;--btn-fg:#0E2118;--ok:#6FE0A0;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E2118;--grid:rgba(232,243,227,.06);--ink:#E8F3E3;--text:#D6E6DA;--muted:#9CB4A4;
  --card:#16302A;--soft:#1C3B2D;--line:#6E9A82;--red:#FF8F80;--deep:#1D4030;--btn:#E8F3E3;--btn-fg:#0E2118;--ok:#6FE0A0;color-scheme:dark}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--text);font:400 17px/1.6 var(--f-body);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:28px 28px;
  overflow-x:hidden;-webkit-text-size-adjust:100%}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:var(--bg)}
h1,h2,h3{font-family:var(--f-display);font-weight:700;color:var(--ink);margin:0;line-height:1.08;text-wrap:balance}
p{margin:0 0 12px}
.w{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
a{color:inherit}
.hand{font:700 32px/1 var(--f-hand);color:var(--red);display:inline-block;transform:rotate(-2deg)}
.mk{--mk:60%;background:linear-gradient(transparent var(--mk),var(--lime) var(--mk)) no-repeat 0 0/100% 100%;color:var(--ink);padding:0 .08em;box-decoration-break:clone;-webkit-box-decoration-break:clone}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .mk{--mk:86%}}
:root[data-theme="dark"] .mk{--mk:86%}
.ans .mk{--mk:86%;color:var(--on-deep)}
html.anim .mk{background-size:0 100%;transition:background-size .8s .15s cubic-bezier(.3,.7,.2,1)}
html.anim .mk.in{background-size:100% 100%}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;border-radius:14px;border:2px solid var(--btn);background:var(--btn);color:var(--btn-fg);font:700 16px/1.2 var(--f-body);text-decoration:none;cursor:pointer;box-shadow:4px 4px 0 var(--lime);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--lime)}
.btn.lime{background:var(--lime);color:var(--lime-ink);border-color:var(--lime-ink);box-shadow:4px 4px 0 var(--lime-ink)}
.btn.lime:hover{box-shadow:2px 2px 0 var(--lime-ink)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line);box-shadow:none}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
:focus-visible{outline:3px solid var(--red);outline-offset:3px}
.skip{position:absolute;left:-999px;top:8px;background:var(--lime);color:var(--lime-ink);padding:10px 14px;border-radius:10px;z-index:99}.skip:focus{left:16px}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);border-bottom:2px solid var(--line)}
.nav .w{display:flex;align-items:center;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 14px/1.1 var(--f-display);color:var(--ink);margin-right:auto;min-width:0}
.brand svg{width:46px;height:42px;flex:none}.brand span{display:block}.brand small{display:block;font:500 11px var(--f-body);color:var(--muted);margin-top:3px}
.links{display:flex;gap:4px}.links a{padding:8px 12px;border-radius:10px;text-decoration:none;font-weight:500;font-size:15px}.links a:hover{background:var(--soft)}
.grade{flex:none;width:42px;height:42px;border-radius:50%;border:3px solid var(--red);display:grid;place-items:center;font:700 20px var(--f-display);color:var(--red);transform:rotate(8deg);transition:border-color .3s,color .3s}
.grade.pop{animation:pop .5s}@keyframes pop{40%{transform:rotate(-10deg) scale(1.3)}}
.grade.five{border-color:var(--ok);color:var(--ok)}
.nav .btn{min-height:42px;padding:8px 16px;font-size:14px;box-shadow:3px 3px 0 var(--lime)}

/* hero */
.hero{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;padding-block:44px 44px}
.hero h1{font-size:clamp(40px,6.4vw,84px);letter-spacing:-.03em;line-height:1;margin:10px 0 20px}
.lead{font-size:clamp(17px,2.1vw,20px);max-width:32em;margin-bottom:24px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.trust{display:flex;gap:8px 20px;flex-wrap:wrap;font-size:14px;color:var(--muted);padding:0;margin:0;list-style:none}
.trust li{display:flex;gap:8px;align-items:center}.trust li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--lime);border:2px solid var(--ink)}
.rcol{justify-self:center;width:min(100%,500px)}.stage{position:relative;width:100%;aspect-ratio:480/460}
.gx{margin-top:44px;border:2px solid var(--line);border-radius:14px;background:var(--card);padding:12px 16px}.gx label{display:block;font-weight:700;font-size:15px;margin-bottom:2px}.gx b{font-family:var(--f-display);color:var(--ink)}.gx input{width:100%;height:44px;accent-color:var(--ink);cursor:pointer;margin:2px 0}.gx output{display:block;font-size:15px;color:var(--muted)}
.plane{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.ax-l path{stroke:var(--ink);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.curve-m{stroke:var(--lime);stroke-width:20;stroke-linecap:round}.curve{stroke:var(--ink);stroke-width:4.5;stroke-linecap:round}
.curve,.curve-m{stroke-dasharray:1;stroke-dashoffset:0;animation:draw 2s .3s cubic-bezier(.5,0,.2,1) both}
@keyframes draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
.roots circle{fill:var(--red);stroke:var(--bg);stroke-width:3;transform-box:fill-box;transform-origin:center;animation:dot .5s 1.9s cubic-bezier(.3,1.8,.5,1) both}
.roots text{font:700 24px var(--f-hand);fill:var(--red);animation:fade .6s 2.2s both}.roots .vx{font:500 13px var(--f-body);fill:var(--muted)}
@keyframes dot{from{transform:scale(0)}to{transform:scale(1)}}@keyframes fade{from{opacity:0}to{opacity:1}}
.stage .axo{position:absolute;left:18%;top:7%;width:64%;z-index:2}
.rise{animation:rise .7s both}.rise.d1{animation-delay:.12s}.rise.d2{animation-delay:.24s}.rise.d3{animation-delay:.36s}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.axo{position:relative;display:block;width:100%;padding:0;border:0;background:none;cursor:pointer;transition:transform .15s}
.axo svg{display:block;width:100%;height:auto;overflow:visible}
.bubble{position:absolute;z-index:3;left:50%;top:-9%;margin-left:-125px;width:250px;max-width:250px;background:var(--card);color:var(--text);border:3px solid var(--line);border-radius:18px 18px 18px 4px;padding:10px 14px;font:700 22px/1.1 var(--f-hand);box-shadow:4px 4px 0 var(--lime-ink);transform:rotate(2deg)}
.hint{position:absolute;left:0;right:0;bottom:-26px;text-align:center;font:700 20px var(--f-hand);color:var(--muted)}

/* axolotl parts */
.o2{stroke:#0F3325;stroke-width:3.5;stroke-linejoin:round;stroke-linecap:round}
.o{stroke:#12392A;stroke-width:5;stroke-linejoin:round;stroke-linecap:round}
.gl{transform-origin:0 0;animation:sway 3.6s ease-in-out infinite}.gl.b{animation-delay:.5s}.gl.c{animation-delay:1s}
@keyframes sway{50%{transform:rotate(7deg)}}
.eye{transform-box:fill-box;transform-origin:center;animation:blink 5s infinite}
@keyframes blink{0%,93%,100%{transform:scaleY(1)}96%{transform:scaleY(.1)}}
.pencil{transform-origin:268px 316px;animation:write 1.4s ease-in-out infinite}
@keyframes write{50%{transform:rotate(-7deg)}}

section{padding-top:72px}
section::before{content:"";display:block;height:14px;margin-bottom:28px;opacity:.55;background:repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 28px) left bottom/100% 12px no-repeat,linear-gradient(var(--ink),var(--ink)) left bottom/100% 2px no-repeat}
.band{background:var(--deep);box-shadow:0 0 0 100vmax var(--deep);clip-path:inset(0 -100vmax);color:var(--on-deep);padding-bottom:84px;margin-top:84px}
.band::before{background:repeating-linear-gradient(90deg,var(--lime) 0 2px,transparent 2px 28px) left bottom/100% 12px no-repeat,linear-gradient(var(--lime),var(--lime)) left bottom/100% 2px no-repeat;opacity:.8}
.band .sec-h{color:var(--on-deep)}.band .hand{color:#FF9A8B}.band .sec-p{color:#CFE3D6}.band .mk{color:var(--on-deep)}
.two{display:grid;grid-template-columns:5fr 6fr;gap:40px;align-items:start}
.rows{border-top:3px solid var(--line)}.rows div{display:grid;grid-template-columns:minmax(0,1fr);gap:4px;padding:18px 0;border-bottom:2px solid var(--line)}.rows b{font:700 19px/1.2 var(--f-display);color:var(--ink)}.rows span{color:var(--text)}
.tasks{list-style:none;margin:0;padding:0;counter-reset:t;display:grid;gap:10px}
.task{counter-increment:t;display:grid;grid-template-columns:auto minmax(0,1fr) max-content;gap:6px 14px;align-items:center;padding:12px 14px;border:2px solid var(--line);border-radius:14px;background:var(--card);transition:border-color .2s,background .2s}
.task::before{content:counter(t);font:700 13px var(--f-display);color:var(--muted);width:26px}
.tq{font:700 20px var(--f-display);color:var(--ink);overflow-wrap:anywhere}.ta{display:flex;gap:8px;align-items:center}
.ta input{flex:none;width:150px;min-height:54px;padding:8px 14px;border:2px solid var(--line);border-radius:12px;font:600 22px var(--f-body);background:var(--bg);color:var(--text);transition:box-shadow .15s,border-color .15s}
.ta input:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 4px var(--lime)}
.ta .btn{min-height:54px;padding:8px 18px;font-size:16px;box-shadow:3px 3px 0 var(--lime)}
.tf{grid-column:2/4;font-size:17px;font-weight:500;min-height:0;color:var(--muted)}.task.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,var(--card))}.task.ok .tf{color:var(--ok);font-weight:700}
.task.bad{animation:nope .35s}.task.bad .tf{color:var(--red)}@keyframes nope{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.sr{position:absolute;left:-9999px}.hwbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:14px}
@media (hover:hover){.note:hover{transform:rotate(0) translateY(-4px)}.note{transition:transform .2s}.st:hover b{color:var(--lime)}.st b{transition:color .25s}.mods li:hover:not(.now){background:var(--card)}.sub button:hover:not([aria-selected=true]),.chl button:hover:not([aria-selected=true]){background:var(--soft)}summary:hover{color:var(--red)}.vp:hover .play{transform:scale(1.1)}.play{transition:transform .2s}.photo{transition:transform .3s}.photo:hover{transform:rotate(3deg) scale(1.04)}}
.btn:active{transform:translate(4px,4px);box-shadow:0 0 0 var(--lime)}.btn.lime:active{box-shadow:0 0 0 var(--lime-ink)}
.btn.busy{pointer-events:none}.btn.busy::after{content:"";width:16px;height:16px;border-radius:50%;border:3px solid currentColor;border-top-color:transparent;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
dialog input:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 4px var(--lime)}
.sec-h{font-size:clamp(28px,4.2vw,46px);margin:6px 0 14px}.sec-p{max-width:38em;margin-bottom:28px}
.know{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.note{background:var(--card);border:2px solid var(--line);border-radius:4px 16px 16px 16px;padding:18px 18px 16px;position:relative}
.note:nth-child(2){transform:rotate(1deg)}.note:nth-child(1){transform:rotate(-1deg)}.note:nth-child(3){transform:rotate(-.5deg)}
.note q{font:700 24px/1.15 var(--f-hand);color:var(--red);quotes:"«" "»";display:block;margin-bottom:8px}
.note p{margin:0;font-size:15px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.st{border-top:4px solid var(--line);padding-top:16px}
.st b{display:block;font:700 72px/1 var(--f-display);color:transparent;-webkit-text-stroke:2.5px var(--ink);margin-bottom:10px}
.st h3{font-size:22px;margin-bottom:8px}.st p{margin:0}

/* cabinet */
.app{color:var(--text);background:var(--card);border:3px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:10px 10px 0 var(--lime)}
.bar{display:flex;align-items:center;gap:6px;flex-wrap:wrap;background:var(--deep);padding:10px 14px}
.dots{display:flex;gap:6px;margin-right:8px}.dots i{width:11px;height:11px;border-radius:50%;background:#E8F3E3;opacity:.35}
.bar [role=tab]{font:600 14px var(--f-body);background:none;border:0;color:var(--on-deep);min-height:44px;padding:9px 14px;border-radius:10px;cursor:pointer}
.bar [role=tab][aria-selected=true]{background:var(--lime);color:var(--lime-ink)}
.me-chip{margin-left:auto;font-size:13px;color:var(--on-deep);opacity:.85}
.cab{display:grid;grid-template-columns:230px 1fr;min-height:420px}
.side{border-right:2px solid var(--line);padding:16px 12px;background:var(--soft);min-width:0}
.side h4{margin:0 0 10px;font:700 12px var(--f-display);letter-spacing:.08em;color:var(--ink)}
.mods{list-style:none;margin:0;padding:0;max-height:300px;overflow:auto;display:grid;gap:4px}
.mods li{display:flex;gap:8px;align-items:center;padding:7px 8px;border-radius:10px;font-size:14px;line-height:1.25}
.mods li i{flex:none;width:20px;height:20px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font:700 11px var(--f-body);font-style:normal}
.mods li.done i{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.mods li.now{background:var(--card);font-weight:700;border:2px solid var(--line)}
.meter{height:12px;border-radius:8px;background:var(--card);border:2px solid var(--line);overflow:hidden;margin:12px 0 4px}
.meter i{display:block;height:100%;background:var(--ink);transition:width .6s}
.main{padding:20px;min-width:0}.main h3{font-size:20px;margin-bottom:12px}
.pn[hidden],.sp[hidden]{display:none}
.sub{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.sub button{min-height:44px;font:600 14px var(--f-body);border:2px solid var(--line);background:none;color:var(--ink);padding:8px 14px;border-radius:99px;cursor:pointer}
.sub button[aria-selected=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.file{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:start}
.sheet{background:#F7F2DD;color:#1c2b22;border-radius:12px;padding:0 0 14px;font-family:Georgia,"Times New Roman",serif;overflow:hidden;box-shadow:4px 4px 0 var(--soft);border:2px solid #d9d2b3}
.sheet .hd{background:#2d5a3d;color:#fff;padding:10px 16px;font-weight:700;font-size:13px;letter-spacing:.06em}
.sheet .bd{padding:12px 16px 0}.sheet .fm{font-size:22px;font-weight:700;margin:6px 0}.sheet p{margin:4px 0;font-size:14px}
.tbl{overflow-x:auto}.sheet table{border-collapse:collapse;font-size:12px;margin-top:8px}.sheet td{border:1px solid #bbb;padding:2px 7px;text-align:center}
.cols{display:grid;grid-template-columns:auto minmax(0,1fr);gap:22px;align-items:start}
.vp{position:relative;width:min(100%,220px);aspect-ratio:9/16;border-radius:20px;background:linear-gradient(170deg,#2f6b4a,#0f2e20);border:3px solid var(--line);overflow:hidden;box-shadow:6px 6px 0 var(--lime);display:grid;place-items:center;cursor:pointer;padding:0;color:#fff}
.vp .ax{position:absolute;bottom:40px;left:8%;width:84%;opacity:.95}.vp .ax svg{width:100%;height:auto;display:block}
.vp .ch{position:absolute;top:12px;left:12px;font:700 12px var(--f-body);background:var(--lime);color:var(--lime-ink);padding:4px 10px;border-radius:99px;z-index:2}
.play{position:relative;z-index:2;width:58px;height:58px;border-radius:50%;background:var(--lime);color:var(--lime-ink);display:grid;place-items:center;font-size:20px;padding-left:3px;border:2px solid var(--lime-ink)}
.vp .pr{position:absolute;left:12px;right:12px;bottom:14px;height:6px;border-radius:4px;background:rgba(255,255,255,.28)}.vp .pr i{display:block;height:100%;width:0;background:var(--lime);border-radius:4px}
.chl{display:grid;gap:8px;margin-top:10px}.chl button{text-align:left;font:600 15px var(--f-body);border:2px solid var(--line);background:none;color:var(--ink);padding:10px 14px;border-radius:12px;cursor:pointer}
.chl button[aria-selected=true]{background:var(--ink);color:var(--bg)}
.hw label{display:flex;gap:12px;align-items:center;margin:8px 0;cursor:pointer;min-height:44px}.hw input{width:22px;height:22px;accent-color:var(--ink);flex:none}
.msg{font:700 28px var(--f-hand);color:var(--ok);min-height:30px;margin-top:10px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}.stat{border:2px solid var(--line);border-radius:14px;padding:12px 14px}.stat b{display:block;font:700 26px var(--f-display);color:var(--ink)}.stat span{font-size:13px;color:var(--muted)}
.week{display:flex;gap:8px;align-items:flex-end;height:96px;margin:6px 0 20px}.week div{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:4px;height:100%;font-size:12px;color:var(--muted)}.week i{display:block;width:100%;max-width:34px;background:var(--ink);border-radius:6px 6px 2px 2px}
.row{display:grid;grid-template-columns:110px 1fr 44px;gap:10px;align-items:center;margin:8px 0;font-size:14px}.row .meter{margin:0}.row b{text-align:right}.row.weak .meter i{background:var(--red)}
.par{border:2px dashed var(--line);border-radius:16px;padding:16px 18px}.par p{margin:6px 0}

.cab.wide{grid-template-columns:1fr}.cab.wide .side{display:none}
.map{position:relative;margin:8px 0 18px;height:320px;border-bottom:2px solid var(--line)}
.map svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.map .rt{fill:none;stroke:var(--line);stroke-width:2;stroke-dasharray:3 7;stroke-linecap:round;vector-effect:non-scaling-stroke;opacity:.6}
.map .me{fill:none;stroke:var(--lime);stroke-width:5;stroke-linecap:round;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.nd{position:absolute;width:42px;height:42px;margin:0 0 -21px -21px;border-radius:50%;border:2px solid var(--line);background:var(--card);color:var(--ink);font:700 14px var(--f-display);cursor:pointer;display:grid;place-items:center;padding:0;transition:transform .15s}
.nd:hover{transform:scale(1.12)}
.nd:focus-visible{outline:3px solid var(--lime);outline-offset:3px}
.nd[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink);transform:scale(1.15)}
.nd.y{border-color:var(--ok)}.nd.c{border-width:3px;background:var(--lime);color:var(--lime-ink);border-color:var(--lime-ink)}.nd.c .fl{display:block}
.nd i{position:absolute;right:-6px;top:-8px;min-width:18px;height:18px;border-radius:9px;font:700 11px/18px var(--f-body);font-style:normal;color:#fff;background:var(--ok);display:none}
.nd.y i{display:block}
.nd .fl{position:absolute;left:-6px;bottom:calc(100% + 8px);transform:rotate(-3deg);font:700 22px/1 var(--f-hand);color:var(--red);white-space:nowrap;display:none;pointer-events:none}

.blk{position:absolute;top:calc(100% + 8px);font:700 13px var(--f-body);color:var(--muted);border-top:3px solid var(--line);padding-top:4px;letter-spacing:.03em}
.mp{border:2px solid var(--line);border-radius:18px;background:var(--card);padding:18px 22px;min-height:150px}
.mp h3{font-size:20px;margin-bottom:10px}.mp dl{margin:0;display:grid;gap:8px}.mp dt{font:700 12px var(--f-body);color:var(--muted);letter-spacing:.06em;text-transform:uppercase}.mp dd{margin:0}
.mp .sx{margin-top:12px;font-weight:700}.lg{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin:40px 0 14px}
.lg span{display:inline-flex;gap:6px;align-items:center}.lg b{width:14px;height:14px;border-radius:50%;border:2px solid var(--line);display:inline-block}
.lg .y b{border-color:var(--ok);background:var(--ok)}.lg .c b{background:var(--lime);border-color:var(--lime-ink)}.lg .u b{border-style:dashed}
@media (max-width:760px){.map{height:auto;border:0;display:grid;grid-template-columns:repeat(5,1fr);gap:18px 6px;justify-items:center;padding-top:22px}
  .map svg,.blk{display:none}.cab.wide .main{padding:16px}.nd{position:relative;left:auto!important;bottom:auto!important;margin:0}.lg{margin-top:14px}}
.stk{position:fixed;right:max(16px,env(safe-area-inset-right,0px));bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:50;background:var(--lime);color:var(--lime-ink);border:2px solid var(--lime-ink);border-radius:14px;padding:12px 20px;font:700 15px var(--f-body);text-decoration:none;box-shadow:4px 4px 0 var(--ink);transform:translateY(120px);transition:transform .3s}
.stk.on{transform:none}
@media (max-width:760px){.stk{left:max(16px,env(safe-area-inset-left,0px));text-align:center}.toast{bottom:calc(86px + env(safe-area-inset-bottom,0px))}}
.ph{margin-top:18px;border:2px dashed var(--line);border-radius:14px;padding:14px 16px}.ph p{margin:4px 0 10px}.phl{position:relative;cursor:pointer}.phl input{position:absolute;inset:0;opacity:0;cursor:pointer}.phl:focus-within{outline:3px solid var(--lime);outline-offset:2px}.phv{margin-top:10px}.phv img{display:block;max-width:100%;max-height:220px;border-radius:10px;border:2px solid var(--line)}
.rz{max-width:760px}.rz-t{font:700 22px/1.3 var(--f-display);color:var(--ink);margin:0 0 16px}
.rzs{border:2px solid var(--line);border-radius:16px;background:var(--card);padding:16px 20px;margin-bottom:12px;animation:rise .4s both}.rzs .n{font:700 13px var(--f-body);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.rzs p{margin:6px 0 10px}.rzs .ta{flex-wrap:wrap}.rzs .ex{color:var(--ok);font-weight:500}.rzs.ok{border-color:var(--ok)}.rzs.ok .ta{display:none}.rzs.bad{animation:nope .35s}.rzs .er{color:var(--red);font-size:17px;margin:0}
.rzs.fin{background:var(--lime);color:var(--lime-ink);border-color:var(--lime-ink)}.rzs.fin .n{color:var(--lime-ink)}.rzs.fin .hand{color:#A12218}
.cap{font-size:13px;color:var(--muted);margin-top:16px}
.dg{max-width:760px}
.dq{border:2px solid var(--line);border-radius:16px;background:var(--card);padding:18px 20px;margin:0 0 14px;min-inline-size:0}
.dq legend{font:700 13px var(--f-body);color:var(--muted);padding:0 8px;letter-spacing:.04em}
.dq .qt{font:700 20px/1.35 var(--f-display);color:var(--ink);margin:0 0 12px}
.dq .op{display:flex;flex-wrap:wrap;gap:8px}
.dq label{position:relative}
.dq input{position:absolute;opacity:0;inset:0;cursor:pointer}
.dq label span{display:inline-flex;align-items:center;min-height:44px;padding:8px 16px;border:2px solid var(--line);border-radius:12px;font-weight:600;color:var(--ink);cursor:pointer}
.dq input:checked+span{background:var(--ink);color:var(--bg)}
.dq input:focus-visible+span{outline:3px solid var(--lime);outline-offset:2px}
.dq label.idk span{border-style:dashed;color:var(--muted)}
.dq input:checked+span{border-style:solid}
.dres{border:2px solid var(--line);border-radius:18px;padding:20px 22px;background:var(--card);box-shadow:6px 6px 0 var(--lime)}
.dres ul{list-style:none;margin:12px 0;padding:0;display:grid;gap:6px}
.dres li{display:flex;gap:10px;align-items:baseline;font-size:15px}.dres li b{flex:none;width:22px}
.dres li.y b{color:var(--ok)}.dres li.n b{color:var(--red)}.dres li.u b{color:var(--muted)}
.empty{border:2px dashed var(--line);border-radius:14px;padding:16px 18px;color:var(--muted)}
.mods li.lock{color:var(--muted)}
.mods li small{margin-left:auto;font-size:11px;color:var(--muted)}
.rst{background:none;border:0;color:var(--muted);text-decoration:underline;cursor:pointer;font:500 13px var(--f-body);min-height:44px;padding:0}


/* compare, parents, teacher */
.cmp{overflow-x:auto;border:3px solid var(--line);border-radius:18px;background:var(--card)}
.cmp table{width:100%;min-width:620px;border-collapse:collapse}
.cmp th,.cmp td{padding:14px 16px;text-align:left;border-bottom:2px solid var(--line);vertical-align:top;font-size:15px}
.cmp tr:last-child td{border-bottom:0}.cmp th{font:700 13px var(--f-display);color:var(--ink)}
.cmp td:first-child{font-weight:700;color:var(--ink)}.cmp .us{background:color-mix(in srgb,var(--lime) 35%,transparent)}
.yes{color:var(--ok);font-weight:700}.no{color:var(--red);font-weight:700}.part{color:var(--muted);font-weight:700}
.par3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.pc{border:2px solid var(--line);border-radius:18px;padding:20px;background:var(--card)}.pc h3{font-size:18px;margin-bottom:8px}.pc p{margin:0;font-size:15px}
.teach{display:grid;grid-template-columns:150px 1fr;gap:28px;align-items:start}
.photo{width:136px;height:136px;border-radius:50%;object-fit:cover;border:4px solid var(--line);transform:rotate(-5deg);background:var(--soft)}
.facts{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 0;padding:0;list-style:none}.facts li{background:var(--lime);color:var(--lime-ink);border:2px solid var(--lime-ink);border-radius:99px;padding:6px 14px;font-weight:700;font-size:14px}
.rv{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:28px}
.rv figure{margin:0;background:var(--card);border:2px solid var(--line);border-radius:4px 18px 18px 18px;padding:16px 18px}.rv blockquote{margin:0 0 8px}.rv figcaption{font:700 22px var(--f-hand);color:var(--red)}

/* offer, faq, answer */
.offer{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.big-card{background:var(--deep);color:var(--on-deep);border-radius:22px;padding:30px}.big-card h2{color:var(--lime);font-size:clamp(26px,3.6vw,40px);margin-bottom:12px}.big-card p{margin:0 0 12px}
.ask{background:var(--card);border:3px solid var(--line);border-radius:22px;padding:26px}.ask ol{margin:0;padding-left:22px}.ask li{margin:10px 0}
details{border-top:3px solid var(--line)}details:last-of-type{border-bottom:3px solid var(--line)}
summary{cursor:pointer;font:700 18px/1.25 var(--f-display);color:var(--ink);padding:18px 0;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
summary::-webkit-details-marker{display:none}summary::after{content:"+";font:500 30px/1 var(--f-body);transition:transform .2s;flex:none}
details[open] summary::after{transform:rotate(45deg)}details>div{padding:0 0 18px;max-width:44em}details ul{margin:0;padding-left:20px}
.ans{margin-top:84px;background:var(--deep);color:var(--on-deep);border-radius:28px;padding:44px 28px;display:grid;grid-template-columns:1fr 240px;gap:24px;align-items:center}
.ans h2{color:var(--lime);font-size:clamp(30px,5vw,56px);margin:6px 0 14px}.ans .hand{color:#FF8F80}.ans p{max-width:30em}
.ans .ax{width:100%}.ans .ax svg{width:100%;height:auto;display:block}
footer{padding-block:34px 90px;font-size:14px;color:var(--muted)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translate(-50%,30px);background:var(--ink);color:var(--bg);padding:12px 18px;border-radius:12px;font-weight:500;opacity:0;pointer-events:none;transition:.3s;z-index:80;max-width:calc(100% - 32px)}
.toast.on{opacity:1;transform:translate(-50%,0)}
dialog{border:3px solid var(--line);border-radius:22px;padding:24px;max-width:430px;width:calc(100% - 32px);background:var(--card);color:var(--text)}
dialog::backdrop{background:rgba(8,20,14,.7)}
dialog h3{font-size:22px;margin-bottom:8px}dialog label{display:block;margin:12px 0 4px;font-weight:500;font-size:15px}
dialog input[type=text],dialog input[type=email],dialog input[type=password]{width:100%;min-height:46px;padding:10px 12px;border-radius:10px;border:2px solid var(--line);font:inherit;background:var(--bg);color:var(--text)}
dialog .k{display:flex;gap:10px;font-size:14px;margin:14px 0;align-items:flex-start}dialog .k input{width:22px;height:22px;margin-top:2px;flex:none;accent-color:var(--ink)}
dialog .btn{width:100%}.x{float:right;background:none;border:0;font-size:30px;line-height:1;cursor:pointer;color:var(--ink);min-width:44px;min-height:44px}

@media (max-width:900px){.links{display:none}.hero{grid-template-columns:1fr;padding-top:24px}.rcol{order:-1;width:min(94%,420px);margin-top:64px}
  .bubble{right:auto;left:50%;top:-64px;margin:0;width:max-content;max-width:88vw;transform:translateX(-50%) rotate(-2deg)}.hint{bottom:-36px}.hero{padding-bottom:72px}}
@media (max-width:760px){
  section{padding-top:56px}.know,.steps,.par3,.offer,.rv,.teach,.ans,.cols,.file,.two{grid-template-columns:1fr}
  .task{grid-template-columns:auto minmax(0,1fr)}.ta{grid-column:1/3}.tf{grid-column:1/3}.ta input{flex:1;min-width:0}.band{margin-top:64px;padding-bottom:64px}
  .cab{grid-template-columns:1fr}.side{order:2;border-right:0;border-top:2px solid var(--line)}.mods{max-height:150px}
  .stats{grid-template-columns:1fr}.row{grid-template-columns:90px 1fr 40px}.teach{justify-items:start}
  .ans{padding:30px 20px}.ans .ax{max-width:200px}.me-chip{display:none}.brand small{display:none}.vp{margin:0 auto}
  .app{box-shadow:6px 6px 0 var(--lime)}.note:nth-child(n){transform:none}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}

.lnk-in{font-weight:700;font-size:14px;color:var(--ink);text-decoration:none;padding:8px 6px;white-space:nowrap}.lnk-in:hover{text-decoration:underline}