:root{--ink:#1f2530;--muted:#5d6675;--cream:#f6f7f9;--paper:#fff;--mint:#f2f4f7;--green:#2455c3;--lime:#e2f3e7;--coral:#cf4a3e;--yellow:#e8eefb;--blue:#2455c3;--pink:#fbe6e3;--sky:#eef3fc;--line:#d7dbe2;--good:#2d7f4d;--hover:#1b449e}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;font:16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:#e8ecf8}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(165deg,#d6e2fb 0%,#e6e6f8 38%,#f3e8f1 68%,#fbe9dc 100%)}
.lk-wait body{visibility:hidden}
.lk-screen{text-align:center;padding:60px 0 80px}
.lk-screen .lede{margin:0 auto 22px}
button,select,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.5}
:focus-visible{outline:2px solid var(--green);outline-offset:2px}
[hidden]{display:none!important}
body.lock{overflow:hidden}

.shell{width:min(1060px,calc(100% - 28px));margin:auto}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 0;flex-wrap:wrap;border-bottom:1px solid rgba(31,37,48,.12)}
.crumb{font-weight:800;color:inherit;text-decoration:none}
h1{font-size:clamp(2.2rem,7vw,3.6rem);line-height:1.05;letter-spacing:-.03em;font-weight:800;margin:30px 0 12px}
h1.long{font-size:clamp(1.9rem,6vw,3rem)}
.lede{color:var(--muted);max-width:62ch;margin:0 0 8px}
.count{color:var(--muted);font-weight:600;margin:0}
.small{color:var(--muted);font-weight:500;font-size:.9rem}
footer{color:var(--muted);padding:40px 0 46px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);border-radius:8px;background:#fff;
padding:8px 14px;font-weight:600;line-height:1.2;color:inherit;text-decoration:none;transition:background .15s,border-color .15s}
.btn:hover:not(:disabled){background:var(--mint);border-color:#c3c9d2}
.btn.go{background:var(--green);border-color:var(--green);color:#fff}
.btn.go:hover:not(:disabled){background:var(--hover);border-color:var(--hover)}
.btn.dark{background:var(--ink);border-color:var(--ink);color:#fff}
.btn.dark:hover:not(:disabled){background:#353d4b}
.btn.soft{background:var(--pink);border-color:#f0cdc8}
.btn.sun{background:var(--yellow);border-color:#cdd9f3}
.btn.sm{padding:5px 10px;font-size:.85rem}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.row.end{justify-content:flex-end}
.row.mid{justify-content:center}
.gap{margin-top:16px}

.field{display:flex;flex-direction:column;gap:5px;font-size:.85rem;font-weight:600;color:var(--muted)}
.in,select.in{width:100%;border:1px solid var(--line);border-radius:8px;background:#fff;padding:9px 11px;font-size:1rem;font-weight:500;color:var(--ink)}
.in:focus{border-color:var(--green);outline:none}
textarea.in{min-height:130px;resize:vertical;line-height:1.5}
.in::placeholder{color:#98a0ad}
.in.shake{animation:shake .45s;border-color:var(--coral)}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}

.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.seg button{border:0;background:none;padding:6px 12px;font-weight:600}
.seg button+button{border-left:1px solid var(--line)}
.seg button.on{background:var(--green);color:#fff}

.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 14px}
.tab{border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 14px;font-weight:600}
.tab:hover{background:var(--mint)}
.tab.on{background:var(--green);border-color:var(--green);color:#fff}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0 8px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px}
.stat b{font-size:1.4rem;display:block}
.jump{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 0}

.head{display:flex;justify-content:space-between;gap:18px;align-items:end;margin:48px 0 16px;flex-wrap:wrap}
.head h2{font-size:clamp(1.6rem,4.5vw,2.3rem);letter-spacing:-.02em;line-height:1.1;margin:0}
.head p{max-width:52ch;color:var(--muted);margin:0}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:12px;padding:0;margin:0;list-style:none}
.card{display:block;width:100%;height:100%;min-height:140px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--paper);
color:inherit;text-decoration:none;text-align:left;transition:border-color .15s}
.card:hover,.card:focus-visible{border-color:var(--green)}
.card.on{background:var(--sky);border-color:var(--green)}
.card .n{font-weight:700;color:var(--green);font-size:.88rem}
.card h3{font-size:1.2rem;line-height:1.2;margin:8px 0 6px}
.card p{margin:0;color:var(--muted);font-size:.92rem}
.card .go{display:inline-block;margin-top:12px;color:var(--green);font-weight:700;font-size:.9rem}
.card.on .go{color:var(--green)}
.card.locked{background:rgba(255,255,255,.45);border-style:dashed;border-color:#c3c9d6;color:#8a91a0;cursor:not-allowed}
.card.locked:hover{border-color:var(--line)}
.card.locked .n,.card.locked p,.card.locked .go{color:#8a91a0}

.panel{background:var(--paper);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.panel-top{display:flex;align-items:end;justify-content:space-between;gap:12px;padding:14px 20px;background:var(--mint);border-bottom:1px solid var(--line);flex-wrap:wrap}
.panel-top b{font-weight:700}
.panel-top .field{min-width:130px;flex:1 1 130px}
.panel-top .field.wide{flex:2 1 220px}
.panel-body{padding:clamp(18px,4vw,34px)}
.bar{height:6px;background:#e3e6eb}
.bar i{display:block;height:100%;width:0;background:var(--green);transition:width .3s}
.tag{font-weight:700;color:var(--green);font-size:.85rem}
.question{font-size:clamp(1.25rem,3.4vw,1.8rem);line-height:1.25;letter-spacing:-.01em;margin:8px 0 22px}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.answer{min-height:58px;text-align:left;border:1px solid var(--line);border-radius:10px;padding:12px 15px;background:#fff;font-weight:500;transition:background .15s,border-color .15s}
.answer:hover:not(:disabled){background:var(--sky);border-color:var(--green)}
.answer:disabled{cursor:default;opacity:1}
.answer.right{background:var(--lime);border-color:var(--good)}
.answer.wrong{background:var(--pink);border-color:var(--coral)}
.feedback{margin-top:18px;padding:16px;border:1px solid var(--line);border-radius:10px;background:var(--mint)}
.feedback strong{display:block;font-size:1.05rem;margin-bottom:4px}
.timer.danger{color:var(--coral)}
.finish{text-align:center}
.finish .big{font-size:clamp(2.4rem,7vw,3.4rem);font-weight:800;line-height:1}
.review{text-align:left;display:grid;gap:10px;margin:18px 0}
.review-item{border:1px solid var(--line);border-left:3px solid var(--coral);border-radius:8px;padding:12px;background:#fff}
.empty{text-align:center;color:var(--muted);padding:26px;border:1px dashed var(--line);border-radius:10px}

.flash{width:min(640px,100%);min-height:230px;margin:auto;border:1px solid var(--line);border-radius:14px;background:#fff;
display:grid;place-items:center;text-align:center;padding:28px;cursor:pointer;user-select:none;transition:background .15s}
.flash.flipped{background:var(--sky);border-color:#cdd9f3}
.flash .label{font-size:.85rem;font-weight:600;color:var(--muted)}
.flash .word{font-size:clamp(1.6rem,5vw,2.6rem);font-weight:800;line-height:1.1;margin:6px 0}
.flash .def{font-size:1.1rem;font-weight:500;line-height:1.5;margin:6px 0}
.flash .hint{color:var(--muted);margin-top:12px;font-size:.9rem}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tile{border:1px solid var(--line);border-radius:10px;background:#fff;padding:12px;text-align:left;font-weight:500;min-height:54px}
.tile:hover:not(:disabled){border-color:var(--green)}
.tile.sel{background:var(--sky);border-color:var(--green)}
.tile.done{background:var(--lime);border-color:var(--good);opacity:.6;cursor:default}
.tile.miss{background:var(--pink);border-color:var(--coral)}
.status{margin-top:13px;font-weight:700;min-height:1.5em}
.seq{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.seq button{border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:#fff;font-weight:600}
.seq button:hover:not(:disabled){background:var(--mint)}
.seq button:disabled{opacity:.32}
.built{min-height:50px;border:1px dashed var(--green);border-radius:10px;padding:12px;background:var(--sky);font-weight:500}
.bigcard{font-size:1.15rem;font-weight:700;text-align:center;padding:22px;background:#fff;border:1px solid var(--line);border-radius:10px;margin:12px 0}
.bigcard.left{text-align:left;font-size:1.05rem}
.bins{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px;margin-top:14px}
.bins button{border:1px solid var(--line);border-radius:10px;background:#fff;padding:12px 8px;font-weight:600;min-height:54px}
.bins button:hover:not(:disabled){background:var(--sky);border-color:var(--green)}
.bins button.right{background:var(--lime);border-color:var(--good);opacity:1}
.bins button.wrong{background:var(--pink);border-color:var(--coral);opacity:1}

details.sec{border:1px solid var(--line);border-radius:12px;background:var(--paper);margin:0 0 12px;overflow:hidden}
details.sec summary{list-style:none;cursor:pointer;padding:15px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;font-weight:700;font-size:1.1rem}
details.sec summary:hover{background:var(--mint)}
details.sec summary::-webkit-details-marker{display:none}
details.sec summary .tag{background:var(--sky);border-radius:6px;padding:3px 9px;white-space:nowrap;font-size:.8rem}
details.sec[open] summary{border-bottom:1px solid var(--line)}
.body{padding:8px 20px 18px;max-width:80ch}
.body h3{margin:18px 0 6px;font-size:1.05rem;color:var(--green)}
.body ul{margin:4px 0 8px;padding-left:20px}
.body li{margin:4px 0}
.body p{margin:8px 0}
.key{background:var(--yellow);border-radius:4px;padding:0 4px;font-weight:700}
.note{background:var(--sky);border-left:3px solid var(--green);border-radius:6px;padding:9px 13px;margin:12px 0}
.scroll{overflow-x:auto;margin:12px 0}
.tbl{width:100%;border-collapse:collapse;font-size:.95rem;background:#fff}
.tbl th,.tbl td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
.tbl th{background:var(--mint);font-weight:700}
.tbl .num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.tbl tr.me td{background:var(--yellow)}

.review-list{margin:0 0 22px}
.review-list details.sec summary{font-size:1rem}
.embed{border:1px solid var(--line);border-radius:12px;background:#fff;padding:8px;margin-top:14px;overflow:hidden}
.embed iframe{display:block;border:0;width:100%;height:500px;border-radius:8px}

.modal{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(31,37,48,.45)}
.sheet{position:relative;width:min(640px,100%);max-height:92vh;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 40px rgba(31,37,48,.18);padding:clamp(18px,4vw,30px)}
.sheet.wide{width:min(1100px,100%)}
.sheet h2{font-size:clamp(1.5rem,4vw,2rem);letter-spacing:-.02em;line-height:1.1;margin:0 44px 8px 0}
.sheet .x{position:absolute;top:14px;right:14px;width:34px;height:34px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:1.2rem;font-weight:600;line-height:1}
.sheet .x:hover{background:var(--mint)}
.msg{min-height:1.5em;margin-top:10px;font-weight:600}
.msg.bad{color:var(--coral)}
.msg.good{color:var(--good)}

@media(max-width:700px){.answers,.grid2{grid-template-columns:1fr}.stats{gap:8px}.stat{padding:10px;font-size:.85rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}