:root {
  --paper: #F7F9FF;
  --line: #D5E0F7;
  --line-strong: #B4C6EE;
  --margin: #E4526B;      /* красное поле тетради = ручка учителя */
  --ink: #2340B8;         /* чернила */
  --ink-deep: #172B7E;
  --text: #1C2340;
  --muted: #5B6488;
  --marker: #FFE14D;      /* жёлтый маркер-выделитель */
  --marker-soft: #FFF3A6;
  --card: #FFFFFF;
  --r-small: 10px;
  --r-big: 22px;
  --margin-x: 34px;
  --hand: "Caveat", "Comic Sans MS", cursive;
  --body: "Andika", "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.45;
  color: var(--text);
  background-color: var(--paper);
  /* Французская клетка Seyès: красное поле, крупные линии через 4 мелких */
  background-image:
    linear-gradient(90deg, transparent calc(var(--margin-x) - 2px), var(--margin) calc(var(--margin-x) - 2px), var(--margin) var(--margin-x), transparent var(--margin-x)),
    repeating-linear-gradient(180deg, transparent 0 31px, var(--line-strong) 31px 32px),
    repeating-linear-gradient(180deg, transparent 0 7px, var(--line) 7px 8px),
    repeating-linear-gradient(90deg, transparent 0 31px, var(--line) 31px 32px);
  background-attachment: fixed;
  -webkit-tap-highlight-color: transparent;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}
#app { max-width: 560px; margin: 0 auto; min-height: 100%; padding: 0 16px 0 calc(var(--margin-x) + 14px); }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
.hand { font-family: var(--hand); }
[hidden] { display: none !important; }

/* ---------- кнопки ---------- */
.btn {
  display: block; width: 100%; border: 0; border-radius: var(--r-small);
  background: var(--ink); color: #fff; font-weight: 700; font-size: 19px;
  padding: 14px 18px; box-shadow: 0 4px 0 var(--ink-deep); transition: transform .08s, box-shadow .08s;
}
.btn:active:not([disabled]) { transform: translateY(3px); box-shadow: 0 1px 0 var(--ink-deep); }
.btn[disabled] { background: #C3CBE3; box-shadow: 0 4px 0 #A5AECB; cursor: default; }
.btn.ghost { background: var(--card); color: var(--ink); border: 2px solid var(--ink); box-shadow: 0 4px 0 var(--line-strong); }
.btn + .btn { margin-top: 12px; }

/* ---------- главный экран ---------- */
.top { display: flex; align-items: center; gap: 18px; padding: 14px 0 6px; font-size: 20px; }
.top .stat b { font-weight: 700; }
.langs { margin-left: auto; display: flex; border: 2px solid var(--ink); border-radius: 999px; overflow: hidden; background: var(--card); }
.langs button { border: 0; background: none; padding: 4px 12px; font-weight: 700; color: var(--ink); font-size: 15px; }
.langs button.on { background: var(--ink); color: #fff; }

.pet { display: flex; align-items: center; gap: 16px; margin: 14px 0 18px; }
.pet-emoji { font-size: 76px; line-height: 1; filter: drop-shadow(0 3px 0 rgba(35,64,184,.15)); }
.pet-name { font-size: 34px; color: var(--ink); line-height: 1; background: none; border: 0; padding: 0; }
.goal { margin-top: 8px; }
.goal-bar { width: 220px; max-width: 100%; height: 16px; border: 2px solid var(--text); border-radius: 4px; background: var(--card); overflow: hidden; }
.goal-bar span { display: block; height: 100%; background: var(--marker); transition: width .6s; }
.goal small, .pet small { color: var(--muted); font-size: 15px; display: block; margin-top: 3px; }

.review {
  width: 100%; display: flex; align-items: center; gap: 10px; text-align: left;
  background: var(--card); border: 2px dashed var(--margin); color: var(--margin); border-radius: var(--r-small);
  padding: 12px 14px; font-weight: 700;
}
.review .badge { margin-left: auto; background: var(--margin); color: #fff; border-radius: 999px; padding: 1px 10px; font-size: 15px; }
.review[disabled] { border-color: var(--line-strong); color: var(--muted); cursor: default; font-weight: 400; }

.path { list-style: none; margin: 26px 0 10px; padding: 0; }
.path li { margin-bottom: 22px; }
.unit { display: flex; align-items: center; gap: 16px; background: none; border: 0; padding: 0; text-align: left; width: 100%; }
.disc {
  flex: none; width: 82px; height: 82px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--marker) var(--p), var(--line) 0); position: relative;
}
.disc::before { content: ""; position: absolute; inset: 7px; border-radius: 50%; background: var(--card); border: 3px solid var(--ink); box-shadow: 0 4px 0 var(--ink-deep); }
.disc span { position: relative; font-size: 34px; }
.disc .crown { position: absolute; top: -14px; right: -6px; font-size: 26px; }
.unit .u-title { font-weight: 700; font-size: 19px; line-height: 1.2; }
.unit .u-sub { color: var(--muted); font-size: 15px; }
.unit.locked .disc::before { border-color: #A5AECB; box-shadow: 0 4px 0 #A5AECB; background: #EEF1FA; }
.unit.locked .disc span { filter: grayscale(1); opacity: .45; }
.unit.locked .u-title { color: var(--muted); }

.ach { margin: 30px 0 40px; }
.ach h3 { font-family: var(--hand); font-size: 28px; color: var(--ink); margin: 0 0 8px; font-weight: 700; }
.ach ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.ach li { background: var(--card); border: 2px solid var(--line-strong); border-radius: 999px; padding: 4px 12px; font-size: 15px; }
.ach .empty { color: var(--muted); font-size: 15px; }

/* ---------- листок снизу ---------- */
.sheet-back { position: fixed; inset: 0; background: rgba(23,43,126,.35); display: flex; align-items: flex-end; justify-content: center; z-index: 10; }
.sheet {
  width: 100%; max-width: 560px; background: var(--card); border-radius: var(--r-big) var(--r-big) 0 0;
  padding: 22px 22px calc(22px + env(safe-area-inset-bottom)); max-height: 88vh; overflow: auto;
  animation: up .22s ease-out;
}
@keyframes up { from { transform: translateY(40px); opacity: 0; } }
.sheet h2 { margin: 6px 0 0; font-size: 26px; }
.sheet .en-title { color: var(--muted); margin: 0 0 12px; }
.sheet .big { font-size: 54px; }
.sheet .meta { margin: 0 0 18px; }
.tip p { margin: 0 0 10px; }
.tip b { background: var(--marker-soft); padding: 0 3px; border-radius: 3px; }
.tip .other { margin-top: 14px; padding-top: 12px; border-top: 2px dashed var(--line-strong); color: var(--muted); font-size: 16px; }
.linkbtn { background: none; border: 0; color: var(--ink); text-decoration: underline; padding: 6px 0; font-size: 16px; }

/* ---------- урок ---------- */
.lesson { min-height: 100vh; display: flex; flex-direction: column; }
.lbar { display: flex; align-items: center; gap: 14px; padding: 16px 0 8px; }
.xbtn { border: 0; background: none; font-size: 26px; color: var(--muted); padding: 0 4px; line-height: 1; }
.prog { flex: 1; height: 14px; border-radius: 999px; background: var(--card); border: 2px solid var(--ink); overflow: hidden; }
.prog span { display: block; height: 100%; background: var(--ink); transition: width .35s; }
.ex { flex: 1; padding: 12px 0 24px; }
.instr { font-family: var(--hand); font-size: 32px; color: var(--ink); margin: 6px 0 14px; line-height: 1.05; font-weight: 700; }
.newtag { display: inline-block; background: var(--marker); color: var(--text); font-family: var(--body); font-size: 14px; font-weight: 700; padding: 1px 8px; border-radius: 4px; vertical-align: middle; margin-left: 6px; }
.emoji-big { font-size: 72px; line-height: 1.1; margin: 4px 0; }
.word-big { font-size: 34px; font-weight: 700; margin: 4px 0; }
.tr { font-size: 22px; margin: 4px 0 18px; }
.peek { border: 1.5px solid var(--line-strong); background: var(--card); color: var(--muted); border-radius: 6px; font-size: 13px; padding: 1px 7px; margin-left: 8px; vertical-align: middle; }
.peeked { display: block; font-size: 17px; color: var(--muted); }
.say { border: 0; background: var(--ink); color: #fff; border-radius: 50%; width: 52px; height: 52px; font-size: 24px; box-shadow: 0 4px 0 var(--ink-deep); vertical-align: middle; }
.say.slow { background: var(--card); color: var(--ink); border: 2px solid var(--ink); width: 44px; height: 44px; font-size: 20px; box-shadow: 0 3px 0 var(--line-strong); margin-left: 8px; }
.say-row { display: flex; align-items: center; gap: 4px; margin: 6px 0 18px; }
.say-row.huge .say { width: 96px; height: 96px; font-size: 44px; }
.bubble { background: var(--card); border: 2px solid var(--ink); border-radius: var(--r-big); padding: 12px 16px; display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.bubble .who { font-size: 44px; }

.opts { display: grid; gap: 10px; }
.opts.two { grid-template-columns: 1fr 1fr; }
.opt {
  background: var(--card); border: 2px solid var(--line-strong); border-radius: var(--r-small);
  padding: 13px 14px; font-size: 19px; text-align: left; box-shadow: 0 3px 0 var(--line-strong);
}
.opt.sel { border-color: var(--ink); box-shadow: 0 3px 0 var(--ink); background: #EEF2FF; }

.sentence { font-size: 26px; font-weight: 700; margin: 6px 0 8px; line-height: 1.5; }
.blank { display: inline-block; min-width: 3.2em; border-bottom: 3px solid var(--ink); text-align: center; color: var(--ink); }

.answer-line {
  min-height: 62px; border-bottom: 2px solid var(--text); margin: 8px 0 18px; padding: 6px 0;
  display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-end;
}
.bank { display: flex; flex-wrap: wrap; gap: 8px; }
.tile { background: var(--card); border: 2px solid var(--line-strong); border-radius: 8px; padding: 7px 12px; font-size: 19px; box-shadow: 0 3px 0 var(--line-strong); }
.tile.used { visibility: hidden; }
.rude { font-size: 28px; font-weight: 700; margin: 0 0 4px; }
.rude-note { color: var(--muted); margin: 0 0 12px; }

.typein {
  width: 100%; font: inherit; font-size: 24px; padding: 12px 14px; border: 2px solid var(--ink);
  border-radius: var(--r-small); background: var(--card); color: var(--text);
}

.match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match .col { display: grid; gap: 10px; align-content: start; }
.match .opt { text-align: center; padding: 12px 8px; font-size: 17px; }
.match .opt.ok { visibility: hidden; }
.match .opt.bad { border-color: var(--margin); box-shadow: 0 3px 0 var(--margin); animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

.foot { position: sticky; bottom: 0; padding: 12px 0 calc(16px + env(safe-area-inset-bottom)); background: linear-gradient(transparent, var(--paper) 30%); }

/* обратная связь: жёлтый маркер или красная ручка учителя */
.fb { margin: 0 calc(-16px) 0 calc(-1 * (var(--margin-x) + 14px)); padding: 16px 16px calc(18px + env(safe-area-inset-bottom)) calc(var(--margin-x) + 14px); animation: up .18s ease-out; }
.fb.good { background: var(--marker-soft); border-top: 4px solid var(--marker); }
.fb.bad { background: #FFF0F2; border-top: 4px solid var(--margin); }
.fb-title { font-family: var(--hand); font-size: 36px; font-weight: 700; line-height: 1; margin-bottom: 6px; }
.fb.good .fb-title { color: var(--ink-deep); }
.fb.bad .fb-title { color: var(--margin); }
.fb-answer { font-size: 20px; margin: 0 0 6px; }
.fb.bad .fb-answer b { color: var(--margin); }
.fb-explain { font-size: 17px; margin: 0 0 12px; }
.fb-explain b { background: var(--card); padding: 0 3px; border-radius: 3px; }
.fb .btn { margin-top: 8px; }
.fb.bad .btn { background: var(--margin); box-shadow: 0 4px 0 #A8344A; }

/* ---------- конец урока ---------- */
.done { text-align: center; padding: 50px 0 30px; }
.done .big-pet { font-size: 110px; line-height: 1; }
.done h1 { font-family: var(--hand); font-size: 50px; color: var(--ink); margin: 16px 0 22px; line-height: 1.1; font-weight: 700; }
.done h1 span {
  background: linear-gradient(100deg, transparent 0 2%, var(--marker) 2% 98%, transparent 98%) no-repeat left 60% / 100% 55%;
  -webkit-box-decoration-break: clone; box-decoration-break: clone; padding: 0 6px;
  animation: stroke .7s .2s ease-out both;
}
@keyframes stroke { from { background-size: 0% 55%; } }
.done .grew { font-size: 20px; margin: -8px 0 18px; }
.res-row { display: flex; justify-content: center; gap: 12px; margin-bottom: 22px; }
.res { background: var(--card); border: 2px solid var(--ink); border-radius: var(--r-small); padding: 10px 14px; min-width: 92px; }
.res b { display: block; font-size: 26px; }
.res small { color: var(--muted); font-size: 14px; }
.new-ach { list-style: none; padding: 0; margin: 0 0 24px; }
.new-ach li { font-size: 20px; margin: 6px 0; }
.goal-done { font-size: 19px; margin: 0 0 20px; }

.center { text-align: center; padding-top: 60px; }
.center .emoji-big { font-size: 110px; }

@media (max-width: 380px) {
  :root { --margin-x: 22px; }
  body { font-size: 17px; }
  .disc { width: 70px; height: 70px; }
  .opts.two { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
.foot.has-fb { padding: 0; background: none; }

.login { max-width: 380px; margin: 0 auto; text-align: left; padding-top: 50px; }
.login .emoji-big, .login h1 { text-align: center; }
.login h1 { font-size: 52px; color: var(--ink); margin: 0 0 20px; font-weight: 700; }
.login label { display: block; font-weight: 700; margin-bottom: 14px; }
.login label span, .login .btn span { font-weight: 400; opacity: .7; }
.login .typein { margin-top: 4px; }
.login-err { color: var(--margin); font-size: 16px; margin: 0 0 12px; }
.whoami { color: var(--muted); font-size: 15px; margin: 0 0 40px; }