/* Тренажёр «Письмо 37»: кнопки разделов сбоку, узкие поля, классический шрифт, всё в пределах экрана. */
:root{--ink:#1d3a34;--muted:#5b6e68;--line:#d8e3de;--paper:#f4f6f3;--card:#fff;--teal:#1f5f57;--teal2:#2c7f78;--soft:#e7f2ef;--acc:#b5762a;--accbg:#fbf1e3;
 --ok:#1e7f50;--okbg:#e2f3e9;--bad:#b93a32;--badbg:#fbe7e4;--side:212px;--fs:16px;--fs-s:14px;--ff:'PT Serif',Georgia,'Times New Roman',serif}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;height:100%}
body{font-family:var(--ff);font-size:var(--fs);line-height:1.42;color:var(--ink);background:var(--paper);display:flex;overflow:hidden}
button,select,input,textarea{font-family:var(--ff);font-size:var(--fs-s);color:var(--ink)}
b,strong{font-weight:700}
.en{font-style:normal}

/* ---------- боковая панель ---------- */
.bar.side{flex:0 0 var(--side);width:var(--side);height:100vh;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:6px;padding:8px 7px;overflow-y:auto}
.bar.side a.home{display:inline-flex;align-items:center;gap:5px;text-decoration:none;color:var(--ink);font-weight:700;font-size:var(--fs-s)!important;align-self:flex-start}
.bar.side .menub{border:1px solid var(--line);background:var(--soft);border-radius:9px;padding:4px 9px;cursor:pointer;font-weight:700;align-self:flex-start}
.bar.side .ttl{font-size:17px;font-weight:700;line-height:1.2;margin:2px 2px 0}
.bar.side .ttl span{display:block;font-size:13px;font-weight:400;color:var(--muted)}
.sgrp{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:6px 4px 1px}
#tabs{display:flex;flex-direction:column;gap:2px}
.sbtn{display:flex;align-items:center;gap:7px;width:100%;text-align:left;border:1px solid transparent;background:none;border-radius:9px;padding:5px 7px;cursor:pointer;line-height:1.2}
.sbtn i{flex:0 0 22px;height:22px;border-radius:50%;background:var(--soft);color:var(--teal);font-style:normal;font-size:12px;font-weight:700;display:grid;place-items:center}
.sbtn:hover{background:var(--soft)}
.sbtn.on{background:var(--teal);color:#fff}.sbtn.on i{background:#fff;color:var(--teal)}
.clock{margin-top:auto;display:flex;align-items:center;gap:6px;padding:6px 4px 2px;border-top:1px solid var(--line)}
.clock b{font-size:20px;min-width:52px}.clock b.low{color:var(--bad)}
.clock button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:4px 9px;cursor:pointer}
.hintb{align-self:flex-start}
.sitemenu{position:fixed;z-index:40;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 40px rgba(29,74,66,.18);padding:5px;display:flex;flex-direction:column;min-width:270px}
.sitemenu a{display:flex;justify-content:space-between;gap:12px;align-items:baseline;text-decoration:none;color:var(--ink);padding:7px 10px;border-radius:9px;font-size:15px}
.sitemenu[hidden]{display:none}
.sitemenu a:hover{background:var(--soft)}.sitemenu a.on{background:var(--teal);color:#fff}.sitemenu a span{font-size:13px;opacity:.75}

/* ---------- рабочая область ---------- */
#main{flex:1;min-width:0;height:100vh;display:flex;flex-direction:column;gap:6px;padding:6px 8px;overflow:hidden}
.top{display:flex;align-items:center;gap:8px;flex-wrap:wrap;min-height:30px}
.top h1{font-size:19px;margin:0 6px 0 2px;line-height:1.2}
.top .src{margin-left:auto;font-size:13px;color:var(--muted)}
.seg{display:flex;gap:4px;flex-wrap:wrap}
.segb{border:1px solid var(--line);background:#fff;border-radius:999px;padding:4px 12px;cursor:pointer}
.segb.on{background:var(--teal);border-color:var(--teal);color:#fff}
.body{flex:1;min-height:0;display:flex;gap:8px}
.body.col{flex-direction:column}
.panel{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:9px 11px;min-width:0;min-height:0;overflow:auto}
.panel h3{margin:0 0 5px;font-size:17px;color:var(--teal)}
.panel h4{margin:6px 0 3px;font-size:16px}
.panel p{margin:0 0 6px}
.panel ul,.panel ol{margin:0 0 6px;padding-left:20px}.panel li{margin:0 0 3px}
.grow{flex:1}.w30{flex:0 0 30%}.w35{flex:0 0 35%}.w40{flex:0 0 40%}.w25{flex:0 0 25%}
.note{font-size:var(--fs-s);color:var(--muted)}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.sp{margin-left:auto}
.btn{border:1px solid var(--line);background:#fff;border-radius:9px;padding:5px 11px;cursor:pointer;line-height:1.25}
.btn:hover{border-color:var(--teal2)}
.btn.main{background:var(--teal);border-color:var(--teal);color:#fff}
.btn.acc{background:var(--acc);border-color:var(--acc);color:#fff}
.btn.sm{padding:3px 9px;font-size:13.5px}
.btn:disabled{opacity:.45;cursor:default}
select.pick{border:1px solid var(--line);border-radius:9px;padding:4px 8px;background:#fff;max-width:340px}
.kv{display:grid;grid-template-columns:auto 1fr;gap:3px 10px}
.tag{display:inline-block;border-radius:6px;padding:0 6px;font-size:13px;background:var(--soft);color:var(--teal);font-weight:700}
.tag.acc{background:var(--accbg);color:var(--acc)}.tag.bad{background:var(--badbg);color:var(--bad)}.tag.ok{background:var(--okbg);color:var(--ok)}
.ex{font-style:italic;color:#2b4a43}
.box{border:1px dashed var(--line);border-radius:10px;padding:7px 9px;margin:0 0 6px;background:#fbfcfb}
.warn{background:var(--accbg);border:1px solid #ecd3ae;border-radius:10px;padding:6px 9px;margin:0 0 6px}

/* задание КИМ */
.kim{font-size:15.5px}
.kim .task{margin:0 0 5px}
.kim .stim{border:1px solid #b9cbc4;border-radius:8px;padding:7px 9px;background:#fbfcfb;margin:0 0 6px}
.kim .hd{font-size:13.5px;color:var(--muted);margin-bottom:4px}
.kim mark{background:#fff0cf;border-radius:3px;padding:0 2px}
.kim mark.q{background:#dff0ea}
.kim sup{font-weight:700;color:var(--acc);font-size:11px}

/* переворачивающиеся карточки */
.cards{display:grid;gap:8px;grid-template-columns:repeat(var(--n,2),minmax(0,1fr));align-content:start}
.flip{position:relative;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;min-height:118px;perspective:900px}
.flip{transition:height .25s}
.flip .in{position:relative;width:100%;height:100%;min-height:inherit;transition:transform .45s;transform-style:preserve-3d}
.flip.on .in{transform:rotateY(180deg)}
.flip .fa,.flip .fb{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;padding:9px 11px;border-radius:12px;overflow:auto;display:flex;flex-direction:column}
.flip .fb{transform:rotateY(180deg);background:#f6fbf9;border:1px solid #bfd9d1}
.flip .fa b.t{font-size:16.5px}
.flip .fl{margin-top:auto;font-size:12.5px;color:var(--muted);padding-top:4px}
.flip .fb ul{margin:0;padding-left:18px}
.flip .fb li{margin:0 0 3px}
.flip.yes .fb{background:var(--okbg);border-color:#a8d6bb}.flip.no .fb{background:var(--badbg);border-color:#e8b8b0}

/* Quizlet */
.qz{display:flex;flex-direction:column;align-items:center;gap:6px}
.qzcard{width:min(560px,100%);min-height:270px;perspective:1000px;cursor:pointer}
.qzcard .in{position:relative;display:grid;width:100%;min-height:270px;transition:transform .45s;transform-style:preserve-3d}
.qzcard.on .in{transform:rotateY(180deg)}
.qzcard .fa,.qzcard .fb{position:relative;grid-area:1/1;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:14px;border:1px solid var(--line);background:#fff;box-shadow:0 4px 14px rgba(29,74,66,.08);display:flex;flex-direction:column;justify-content:center;align-items:center;padding:12px 16px;text-align:center;overflow:auto}
.qzcard .fb{transform:rotateY(180deg);background:#f6fbf9;align-items:stretch;text-align:left;justify-content:flex-start}
.qzterm{font-size:23px;font-weight:700}
.qzsub{font-size:14px;color:var(--muted);margin-top:4px}
.qzcard .fb ul{margin:0;padding-left:18px}.qzcard .fb li{margin:0 0 2px}
.qznav{display:flex;align-items:center;gap:10px}
.qznav .cnt{min-width:64px;text-align:center;font-weight:700}

/* выбор и игры */
.opts{display:grid;gap:6px;grid-template-columns:repeat(var(--n,3),minmax(0,1fr))}
.opt{border:1px solid var(--line);background:#fff;border-radius:9px;padding:6px 9px;cursor:pointer;text-align:left;line-height:1.25}
.opt:hover{border-color:var(--teal2)}
.opt.ok{background:var(--okbg);border-color:#9fd1b4}.opt.bad{background:var(--badbg);border-color:#e3aaa2}
.opt.sel{border-color:var(--teal);box-shadow:inset 0 0 0 1px var(--teal)}
.opt.dim{opacity:.55}
.verdict{border-radius:9px;padding:6px 9px;margin:5px 0;background:var(--soft)}
.verdict.ok{background:var(--okbg)}.verdict.bad{background:var(--badbg)}
.score{font-weight:700}
.tile{border:1px solid var(--line);border-radius:10px;background:#fff;padding:7px 9px;cursor:pointer;text-align:left}
.tile.sel{border-color:var(--teal);background:var(--soft)}
.tile.ok{background:var(--okbg);border-color:#9fd1b4}.tile.bad{background:var(--badbg);border-color:#e3aaa2}.tile.miss{border:2px dashed var(--ok)}
.jcard{border:1px solid var(--line);border-radius:12px;background:#fff;padding:8px 10px;display:flex;flex-direction:column;gap:5px}
.jcard .stim{font-size:14px;color:var(--muted)}
.jcard .q{font-size:16.5px;font-weight:700}
.jcard .two{display:grid;grid-template-columns:1fr 1fr;gap:6px}

/* структура */
.skrow{display:flex;gap:8px;align-items:flex-start;padding:5px 7px;border-radius:9px;background:#f4f7f5;margin:0 0 4px}
.skrow i{flex:0 0 22px;height:22px;border-radius:50%;background:#cfe1db;color:#fff;font-style:normal;font-size:12px;font-weight:700;display:grid;place-items:center}
.skrow.on{background:var(--soft)}.skrow.on i{background:var(--teal)}
.skrow .ph{display:block;font-style:italic}
.skrow .alt{margin-left:auto;font-size:13.5px;color:var(--muted);max-width:46%;text-align:right}
.part{display:block;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:9px;padding:5px 8px;margin:0 0 4px;cursor:pointer}
.part b{color:var(--teal);margin-right:6px}
.part.bad{background:var(--badbg)}
.letter{font-family:var(--ff);white-space:pre-wrap;font-size:15px;line-height:1.45;background:#fffef9;border:1px solid #e7e0cc;border-radius:10px;padding:8px 11px;margin:0}
.letter .nw{background:#fff0cf}

/* таблица критериев */
.crit{width:100%;border-collapse:collapse;font-size:14.5px}
.crit th,.crit td{border:1px solid var(--line);padding:5px 7px;vertical-align:top;text-align:left}
.crit th{background:var(--soft);font-size:14.5px}
.crit td:first-child{font-weight:700;text-align:center;width:40px}

/* письмо и проверка */
textarea.lt{width:100%;height:100%;resize:none;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:16px;line-height:1.5;background:#fffef9}
.ck{display:flex;gap:7px;align-items:flex-start;padding:3px 0;font-size:14.5px}
.ck i{flex:0 0 18px;height:18px;border-radius:5px;border:1.5px solid #9db8b0;font-style:normal;font-size:12px;display:grid;place-items:center;margin-top:2px}
.ck.ok i{background:var(--ok);border-color:var(--ok);color:#fff}
.ck span{color:var(--muted);font-size:13px}
label.ck{cursor:pointer}
label.ck input{margin-top:4px}
.ctr{display:flex;align-items:center;gap:6px;margin:3px 0}
.ctr b{min-width:24px;text-align:center}
.ctr .btn{padding:1px 9px}
.big{font-size:30px;font-weight:700;color:var(--teal)}

/* банк */
.blist{display:flex;flex-direction:column;gap:3px}
.bitem{text-align:left;border:1px solid transparent;background:none;border-radius:8px;padding:4px 7px;cursor:pointer;line-height:1.25}
.bitem small{display:block;color:var(--muted);font-size:12.5px}
.bitem:hover{background:var(--soft)}.bitem.on{background:var(--teal);color:#fff}.bitem.on small{color:#d7ece6}
input.bsearch{width:100%;border:1px solid var(--line);border-radius:9px;padding:5px 8px;margin:0 0 5px}
.bq{border-top:1px solid var(--line);padding:5px 0}
.bq .a{background:var(--soft);border-radius:8px;padding:5px 8px;margin-top:4px}
pre.model{white-space:pre-wrap;font-family:var(--ff);font-size:15.5px;margin:0}

/* оверлей */
.overlay{position:fixed;inset:0;background:rgba(29,58,52,.35);display:flex;justify-content:flex-end;z-index:30}
.teach{width:min(540px,100%);height:100%;overflow:auto;background:#fff;border-left:4px solid var(--acc);padding:12px 14px}
.teach h4{margin:0 0 8px;font-size:17px;color:var(--acc)}
.teach ol,.teach ul{padding-left:20px}.teach li{margin:0 0 5px}

@media(min-width:1600px){:root{--fs:18px;--fs-s:15.5px;--side:240px}.top h1{font-size:21px}.panel h3{font-size:19px}.kim{font-size:17px}.letter,pre.model{font-size:17px}.qzterm{font-size:26px}textarea.lt{font-size:18px}.jcard .q,.flip .fa b.t{font-size:18px}}
@media(max-width:900px){
 body{flex-direction:column;overflow:auto}
 .bar.side{width:100%;flex:none;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center}
 #tabs{flex-direction:row;flex-wrap:wrap}.sgrp{display:none}.sbtn{width:auto}.clock{margin:0;border:0}
 #main{height:auto;overflow:visible}.body{flex-direction:column}.w30,.w35,.w40,.w25{flex:none}
 .cards{grid-template-columns:1fr}
}