/* Домашка — школьная тетрадь: обложка, клетка, красные поля, пометки ручкой. */
:root{
  --paper:#fbfaf6; --grid:#dde6f4; --margin:#e2555a; --ink:#22429c; --ink-2:#17307a; --pen:#1d1d1f;
  --red:#d93025; --cover:#5b8c5a; --cover-2:#4a7449; --mark:#fff176; --text:#1f2430; --muted:#6a7080; --line:#e3e6ec;
  --safe-b:env(safe-area-inset-bottom,0px); --safe-t:env(safe-area-inset-top,0px);
  --font:"Golos Text",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --hand:"Caveat","Segoe Print",cursive;
  --cells:linear-gradient(var(--grid) 1px,transparent 1px) 0 0/24px 24px,linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/24px 24px;
  --noise:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .06 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:var(--font);color:var(--text);background:#d8d3c8;-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.45}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
input{font:inherit}
img{display:block;max-width:100%}

/* ---- сцена ---- */
.stage{min-height:100%;display:flex;align-items:center;justify-content:center;gap:56px;padding:40px 24px}
.stage-note{max-width:320px;color:#3d3a33}
.stage-note h1{font-family:var(--hand);font-weight:700;font-size:56px;color:var(--ink);margin-bottom:8px;line-height:1}
.stage-note p{margin-bottom:12px}
.stage-hint{font-size:14px}.stage-mode{font-size:13px;color:#6a6660}
.phone{width:390px;height:min(844px,calc(100vh - 40px));background:#15161a;border-radius:54px;padding:14px;box-shadow:0 30px 80px rgba(30,25,15,.4);position:relative;flex:none}
.phone::before{content:"";position:absolute;top:26px;left:50%;transform:translateX(-50%);width:118px;height:34px;background:#15161a;border-radius:20px;z-index:5}
.app{width:100%;height:100%;background:var(--paper);border-radius:42px;overflow:hidden;position:relative;--safe-t:52px;--safe-b:22px}
@media (max-width:760px){
  body{background:var(--paper)}
  .stage{padding:0;gap:0;display:block;min-height:100dvh}
  .stage-note{display:none}
  .phone{width:100%;height:100dvh;padding:0;border-radius:0;box-shadow:none}
  .phone::before{display:none}
  .app{border-radius:0;--safe-t:env(safe-area-inset-top,0px);--safe-b:env(safe-area-inset-bottom,0px)}
}

/* ---- экраны: лист в клетку с красными полями ---- */
.screen{position:absolute;inset:0;display:none;flex-direction:column;padding-top:var(--safe-t);background:var(--cells),var(--paper)}
.screen::before{content:"";position:absolute;inset:0;background:var(--noise);pointer-events:none;opacity:.8}
.screen::after{content:"";position:absolute;top:0;bottom:0;left:calc(var(--m,52px));width:1.5px;background:var(--margin);opacity:.75;pointer-events:none}
.screen.active{display:flex}
.screen>*{position:relative;z-index:1}
.top{display:flex;align-items:center;gap:12px;padding:12px 20px 6px 64px;min-height:56px}
.brand{font-family:var(--hand);font-weight:700;font-size:34px;color:var(--ink);flex:1;line-height:1;transform:rotate(-1.5deg)}
.back{font-size:34px;line-height:1;color:var(--ink);width:36px;margin-left:-44px}
.chat-title{flex:1;font-weight:600;font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.quota{font-family:var(--hand);font-size:19px;line-height:1;color:var(--red);white-space:nowrap;transform:rotate(2deg)}
.quota.pro{color:var(--ink)}
.quota.low{text-decoration:underline wavy}

/* ---- обложка тетради ---- */
.screen[data-screen=onboard]{background:radial-gradient(120% 80% at 30% 20%,var(--cover) 0,var(--cover-2) 100%);padding:calc(var(--safe-t) + 24px) 24px calc(var(--safe-b) + 20px)}
.screen[data-screen=onboard]::after{display:none}
.screen[data-screen=onboard]::before{opacity:1}
.cover{flex:1;display:flex;flex-direction:column}
.label{background:#fdfcf7;border:1.5px solid #c9c4b2;padding:22px 18px 16px;text-align:center;box-shadow:0 2px 0 #c9c4b2,0 12px 30px rgba(0,0,0,.18);position:relative;transform:rotate(-.6deg);margin:10px 8px 0}
.label::before{content:"";position:absolute;inset:6px;border:1px solid #d6d1bf;pointer-events:none}
.label-title{font-family:var(--font);font-weight:700;font-size:28px;letter-spacing:.14em;text-transform:uppercase;color:#2a2a2a}
.label-sub{font-size:15px;color:#3a3a3a;margin:2px 0 18px}
.label-line{font-size:15px;color:#3a3a3a;margin-bottom:10px}
.fill{display:inline-block;min-width:34px;border-bottom:1.5px solid #2a2a2a;font-family:var(--hand);font-size:24px;line-height:1;color:var(--ink);padding:0 4px;vertical-align:-2px}
.label-name input{width:82%;border:0;border-bottom:1.5px solid #2a2a2a;background:transparent;font-family:var(--hand);font-size:26px;color:var(--ink);text-align:center;outline:none;padding:0 4px}
.label-name input::placeholder{color:#b9b4a3;font-size:18px;font-family:var(--font)}
.label-hint{font-size:12.5px;color:#7a7668;margin-top:14px;line-height:1.35}
.grade-pick{margin-top:auto;padding-top:22px}
.grade-q{color:#eaf3e8;font-size:14px;margin-bottom:8px}
.grade-row{display:flex;gap:6px;margin-bottom:16px}
.grade-row button{flex:1;height:42px;border-radius:8px;background:rgba(255,255,255,.14);color:#fff;font-weight:600;border:1px solid rgba(255,255,255,.25)}
.grade-row button.on{background:#fdfcf7;color:var(--ink);border-color:#fdfcf7}
.screen[data-screen=onboard] .btn-primary{background:#fdfcf7;color:var(--ink)}

/* ---- кнопки ---- */
.btn-primary{width:100%;height:54px;border-radius:10px;background:var(--ink);color:#fff;font-weight:600;font-size:17px;flex:none;box-shadow:0 3px 0 var(--ink-2)}
.btn-primary:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink-2)}
.btn-ghost{width:100%;height:46px;border-radius:10px;border:1.5px solid var(--ink);color:var(--ink);font-weight:500;background:transparent}
.btn-link{width:100%;padding:14px;color:var(--muted);font-size:15px}

/* ---- главная: страница с датой, «вклеенное» фото, стикеры ---- */
.home-body{flex:1;overflow:auto;padding:0 20px calc(var(--safe-b) + 92px) 64px;display:flex;flex-direction:column}
.page-date{font-family:var(--hand);font-size:20px;color:var(--pen);text-align:right;margin-bottom:8px;opacity:.85}
.cam{position:relative;width:100%;aspect-ratio:1/0.86;border:1.5px dashed var(--ink);background:rgba(255,255,255,.55);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;text-align:center;flex:none;transform:rotate(-.8deg)}
.cam:active{transform:rotate(-.8deg) scale(.985)}
.corner{position:absolute;width:26px;height:26px;background:#f3ecd2;opacity:.9;box-shadow:0 1px 2px rgba(0,0,0,.15)}
.corner.tl{left:-6px;top:-6px;clip-path:polygon(0 0,100% 0,0 100%)}
.corner.tr{right:-6px;top:-6px;clip-path:polygon(0 0,100% 0,100% 100%)}
.corner.bl{left:-6px;bottom:-6px;clip-path:polygon(0 0,0 100%,100% 100%)}
.corner.br{right:-6px;bottom:-6px;clip-path:polygon(100% 0,100% 100%,0 100%)}
.cam-icon{width:78px;height:78px;border-radius:50%;background:var(--ink);display:flex;align-items:center;justify-content:center;margin-bottom:8px;box-shadow:0 3px 0 var(--ink-2)}
.cam-icon img{width:38px}
.cam-title{font-family:var(--hand);font-weight:700;font-size:32px;line-height:1;color:var(--pen)}
.cam-sub{font-size:13.5px;color:var(--muted);max-width:26ch}
.home-or{font-family:var(--hand);font-size:20px;color:var(--pen);margin:22px 0 10px;opacity:.85}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:12px 10px}
.mode{text-align:left;padding:12px 12px 10px;display:flex;flex-direction:column;gap:1px;min-height:74px;box-shadow:0 4px 10px rgba(0,0,0,.12);position:relative}
.mode::before{content:"";position:absolute;top:-6px;left:50%;width:44px;height:12px;margin-left:-22px;background:rgba(255,255,255,.55);transform:rotate(-2deg);box-shadow:0 1px 2px rgba(0,0,0,.08)}
.mode b{font-weight:700;font-size:15px;color:#2a2a2a}
.mode span{font-size:12.5px;color:#4d4d4d}
.s1{background:#fff59d;transform:rotate(-1.5deg)}
.s2{background:#b3e5fc;transform:rotate(1.2deg)}
.s3{background:#ffccbc;transform:rotate(1deg)}
.s4{background:#c8e6c9;transform:rotate(-1deg)}
.mode:active{transform:scale(.97)}

/* ---- таббар: закладки ---- */
.tabbar{position:absolute;left:0;right:0;bottom:0;display:flex;background:rgba(251,250,246,.95);backdrop-filter:blur(8px);border-top:1.5px solid var(--grid);padding:8px 8px calc(var(--safe-b) + 6px);z-index:3}
.tabbar button{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11px;color:var(--muted);padding:6px 0}
.tabbar button img{width:24px;opacity:.5}
.tabbar button.on{color:var(--ink)}
.tabbar button.on img{opacity:1}
.tabbar button.on span{background:linear-gradient(transparent 30%,var(--mark) 30%,var(--mark) 90%,transparent 90%);padding:0 4px}
.tabbar[hidden]{display:none}

/* ---- чат: вопросы — синей ручкой, решение — на листе с полями, проверка — красной ---- */
.thread{flex:1;overflow:auto;padding:8px 16px 16px 20px;display:flex;flex-direction:column;gap:16px}
.msg{max-width:92%;padding:10px 14px;font-size:15.5px;line-height:1.5;word-wrap:break-word}
.msg.user{align-self:flex-end;font-family:var(--hand);font-size:22px;line-height:1.25;color:var(--ink);background:transparent;padding:4px 8px 4px 44px;text-align:right}
.msg.user img{border-radius:4px;max-height:220px;margin:0 0 6px auto;border:6px solid #fff;box-shadow:0 4px 12px rgba(0,0,0,.18);transform:rotate(1.5deg)}
.msg.ai{align-self:stretch;max-width:100%;background:rgba(255,255,255,.6);border:1px solid #d8dfec;padding:14px 16px 12px 16px;position:relative;margin-left:34px}
.msg.ai::before{content:"";position:absolute;top:0;bottom:0;left:-1px;width:1.5px;background:var(--margin);opacity:.7}
.msg.ai p{margin:0 0 8px}
.msg.ai ol,.msg.ai ul{margin:0 0 8px 20px}
.msg.ai li{margin-bottom:4px}
.msg.ai strong{background:linear-gradient(transparent 35%,var(--mark) 35%,var(--mark) 92%,transparent 92%);padding:0 3px;font-weight:600}
.msg.ai em{color:var(--muted);font-style:normal;font-size:13px}
.msg.ai .cursor{display:inline-block;width:2px;height:18px;background:var(--ink);vertical-align:-3px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.msg.ai.done::after{content:"✓ верно";position:absolute;top:-14px;right:10px;font-family:var(--hand);font-size:26px;font-weight:700;color:var(--red);transform:rotate(-6deg);line-height:1}
.msg.err{align-self:stretch;background:#fff2f0;color:#8a1f12;font-size:14px;border-left:3px solid var(--red)}
.msg.err b{display:block;margin-bottom:2px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin:-6px 0 0 34px}
.actions button{font-family:var(--hand);font-size:19px;line-height:1;padding:7px 12px;border:1.5px solid var(--ink);border-radius:2px 14px 2px 14px;color:var(--ink);background:rgba(255,255,255,.6)}
.composer{display:flex;gap:8px;align-items:center;padding:10px 12px calc(var(--safe-b) + 10px);border-top:1.5px solid var(--grid);background:rgba(251,250,246,.96)}
.comp-cam{width:44px;height:44px;border-radius:50%;background:#fff;border:1.5px solid var(--ink);display:flex;align-items:center;justify-content:center;flex:none}
.comp-cam img{width:22px;filter:invert(22%) sepia(56%) saturate(1700%) hue-rotate(208deg) brightness(90%)}
.composer input{flex:1;height:44px;border:0;border-bottom:1.5px solid var(--ink);background:transparent;padding:0 8px;outline:none;min-width:0;font-family:var(--hand);font-size:22px;color:var(--ink)}
.composer input::placeholder{color:#9aa3b8;font-family:var(--font);font-size:15px}
.comp-send{width:44px;height:44px;border-radius:50%;background:var(--ink);color:#fff;font-size:22px;font-weight:700;flex:none;box-shadow:0 3px 0 var(--ink-2)}
.comp-send:disabled{opacity:.4}

/* ---- история ---- */
.hist{flex:1;overflow:auto;padding:4px 16px calc(var(--safe-b) + 90px) 64px}
.hist-item{display:flex;gap:12px;padding:12px 4px;border-bottom:1px dashed var(--grid);align-items:center;text-align:left;width:100%}
.hist-item img{width:52px;height:52px;object-fit:cover;border:3px solid #fff;box-shadow:0 2px 6px rgba(0,0,0,.15);flex:none;transform:rotate(-2deg)}
.hist-item .ph{width:52px;height:52px;background:#fff59d;display:flex;align-items:center;justify-content:center;font-family:var(--hand);font-size:22px;color:#2a2a2a;flex:none;transform:rotate(2deg);box-shadow:0 2px 6px rgba(0,0,0,.12)}
.hist-item b{display:block;font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hist-item span{font-size:13px;color:var(--muted)}
.hist-item div{min-width:0;flex:1}
.empty{padding:60px 24px;text-align:center;color:var(--muted);font-family:var(--hand);font-size:22px;line-height:1.3}
.empty b{display:block;color:var(--pen);font-weight:700;margin-bottom:6px;font-size:28px}

/* ---- профиль ---- */
.prof{flex:1;overflow:auto;padding:4px 20px calc(var(--safe-b) + 90px) 64px}
.prof-card{padding:18px;background:#fff59d;margin-bottom:14px;box-shadow:0 4px 10px rgba(0,0,0,.12);transform:rotate(-1deg)}
.prof-card.pro{background:#c8e6c9}
.prof-card b{display:block;font-family:var(--hand);font-size:30px;line-height:1;margin-bottom:6px;color:#2a2a2a}
.prof-card span{font-size:14px;color:#4d4d4d}
.prof-card button{margin-top:12px;height:40px;padding:0 16px;border-radius:8px;background:var(--ink);color:#fff;font-weight:600;box-shadow:0 2px 0 var(--ink-2)}
.prof-row{display:flex;justify-content:space-between;padding:12px 4px;border-bottom:1px dashed var(--grid)}
.prof-row b{font-family:var(--hand);font-size:22px;line-height:1;color:var(--ink)}
.prof .btn-ghost{margin-top:20px}
.prof-legal{margin-top:20px;font-size:13px;color:var(--muted)}

/* ---- шторки ---- */
.sheet{position:absolute;inset:0;background:rgba(30,35,60,.5);z-index:10;display:flex;align-items:flex-end}
.sheet[hidden]{display:none}
.sheet-body{width:100%;background:var(--cells),var(--paper);border-top:2px solid var(--ink);padding:14px 20px calc(var(--safe-b) + 16px);max-height:92%;overflow:auto;animation:up .28s ease-out}
@keyframes up{from{transform:translateY(40px);opacity:0}}
@media (prefers-reduced-motion:reduce){.sheet-body{animation:none}.cursor{animation:none}}
.sheet-grip{width:40px;height:4px;border-radius:2px;background:var(--grid);margin:0 auto 14px}
.sheet h2{font-family:var(--hand);font-weight:700;font-size:34px;line-height:1;color:var(--pen);margin-bottom:8px}
.sheet p{color:#475069;margin-bottom:16px;font-size:15px}
.plans{display:flex;flex-direction:column;gap:12px;margin-bottom:16px}
.plan{position:relative;text-align:left;padding:14px 16px;border:1.5px solid var(--ink);background:rgba(255,255,255,.7);display:flex;flex-direction:column;gap:2px;border-radius:2px}
.plan.on{background:#fff59d;box-shadow:0 3px 0 var(--ink)}
.plan b{font-weight:700;font-size:17px}
.plan span{font-size:13px;color:#4d4d4d}
.plan i{position:absolute;top:-14px;right:12px;font-family:var(--hand);font-style:normal;font-size:24px;font-weight:700;color:var(--red);transform:rotate(-6deg)}
.pay-alt{text-align:center;font-size:13px;color:var(--muted);margin:10px 0 0}
.preview-img{width:100%;max-height:360px;object-fit:contain;background:#fff;border:6px solid #fff;box-shadow:0 4px 14px rgba(0,0,0,.18);margin-bottom:14px;transform:rotate(-1deg)}
#previewNote{width:100%;height:46px;border:0;border-bottom:1.5px solid var(--ink);background:transparent;padding:0 6px;margin-bottom:14px;outline:none;font-family:var(--hand);font-size:22px;color:var(--ink)}
#previewNote::placeholder{color:#9aa3b8;font-family:var(--font);font-size:15px}