:root{
  --forest:#0F3D2E; --forest-2:#17543f; --lime:#AEEA00; --lime-soft:#EAF8B8; --orange:#E8590C; --orange-soft:#FDE6D8;
  --ink:#16221d; --slate:#52615a; --line:#dfe6e0; --bg:#F4F7F2; --card:#fff;
  --ok:#1b8a4b; --ok-soft:#dff3e6; --warn:#b7791f; --warn-soft:#fdf1d6; --bad:#c0392b; --bad-soft:#fbe3df; --grey-soft:#eceff0;
  --radius:16px; --shadow:0 1px 2px rgba(15,61,46,.06),0 6px 20px rgba(15,61,46,.07);
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.5;font-size:16px}
a{color:var(--forest-2)}
button{font:inherit;cursor:pointer}
h1,h2,h3{line-height:1.2;margin:0 0 .4em}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.top{background:var(--forest);color:#fff;position:sticky;top:0;z-index:20}
.top .wrap{display:flex;align-items:center;gap:14px;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.01em}
.bolt{width:34px;height:34px;border-radius:50%;background:var(--lime);display:grid;place-items:center;flex:none}
.bolt svg{width:19px;height:19px}
.crumbs{color:#b9d3c6;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crumbs a{color:#d9ecdf;text-decoration:none}.crumbs a:hover{text-decoration:underline}
.spacer{flex:1}
.chip-user{display:flex;align-items:center;gap:10px;font-size:14px;color:#d9ecdf}
.chip-user button{background:transparent;border:1px solid #3f6b59;color:#d9ecdf;border-radius:999px;padding:5px 12px;font-size:13px}
.chip-user button:hover{background:#17543f}
.name-long{max-width:160px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* hero */
.hero{background:linear-gradient(160deg,var(--forest) 0%,var(--forest-2) 100%);color:#fff;padding:34px 0 64px}
.eyebrow{display:inline-block;background:var(--lime);color:var(--forest);font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:999px;margin-bottom:12px}
.hero h1{font-size:clamp(30px,5vw,46px);letter-spacing:-.02em;margin-bottom:6px}
.hero p{margin:0;color:#cfe5d8;font-size:18px;max-width:640px}
.weeks{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.pill{border:1px solid #3f6b59;color:#d9ecdf;border-radius:999px;padding:5px 13px;font-size:14px;background:transparent;text-decoration:none}
.pill.on{background:var(--lime);color:var(--forest);border-color:var(--lime);font-weight:700}
.pill.soft{opacity:.55;cursor:default}

/* home grid */
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(min(100%,440px),1fr));margin-top:-42px;padding-bottom:40px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;display:flex;flex-direction:column;gap:12px;border:1px solid var(--line)}
.card h2{font-size:22px;display:flex;align-items:center;gap:10px}
.card .sub{color:var(--slate);margin:0;font-size:15px}
.num{width:28px;height:28px;border-radius:8px;background:var(--lime-soft);color:var(--forest);display:grid;place-items:center;font-size:14px;font-weight:800;flex:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 18px;font-weight:700;background:var(--forest);color:#fff;text-decoration:none}
.btn:hover{background:var(--forest-2)}
.btn.lime{background:var(--lime);color:var(--forest)}.btn.lime:hover{background:#c2f526}
.btn.orange{background:var(--orange)}.btn.orange:hover{background:#cf4d08}
.btn.ghost{background:transparent;color:var(--forest);border:1.5px solid var(--line)}.btn.ghost:hover{border-color:var(--forest);background:#fff}
.btn.small{padding:7px 12px;font-size:14px;border-radius:10px}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.stack{display:flex;flex-direction:column;gap:10px}
.row-link{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff}
.row-link:hover{border-color:var(--forest);background:#fbfdfa}
.row-link .ic{width:36px;height:36px;border-radius:10px;background:var(--lime-soft);display:grid;place-items:center;flex:none}
.row-link .ic svg{width:20px;height:20px;stroke:var(--forest);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.row-link b{display:block}.row-link small{color:var(--slate)}
.row-link .tick{margin-left:auto}
.tick{width:24px;height:24px;border-radius:50%;background:var(--ok);color:#fff;display:grid;place-items:center;font-size:14px;flex:none}
.tick.todo{background:transparent;border:2px solid var(--line);color:transparent}
.elements{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.el{position:relative;display:block;text-decoration:none;color:#fff;border-radius:12px;padding:8px 10px 10px;aspect-ratio:1/1;min-height:82px;transition:transform .12s}
.el:hover{transform:translateY(-2px)}
.el .s{font-size:28px;font-weight:800;line-height:1}
.el .n{font-size:12px;opacity:.92;position:absolute;left:10px;bottom:8px}
.el .tick{position:absolute;right:7px;top:7px;width:20px;height:20px;font-size:12px;background:#fff;color:var(--ok)}
.el .tick.todo{display:none}

/* page */
.page{padding:28px 0 60px}
.back{display:inline-flex;align-items:center;gap:6px;color:var(--slate);text-decoration:none;font-size:14px;margin-bottom:12px}
.back:hover{color:var(--forest)}
.page h1{font-size:clamp(26px,4vw,36px);letter-spacing:-.02em}
.lead{color:var(--slate);font-size:17px;margin:0 0 22px;max-width:720px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel + .panel{margin-top:18px}
.panel h3{font-size:18px}
.cols{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:20px;align-items:start}
@media(max-width:820px){.cols{grid-template-columns:1fr}}
.tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--slate)}
.bg p{margin:.4em 0 .8em}

/* tables */
.tablewrap{overflow-x:auto;margin:10px 0}
table.data{border-collapse:collapse;width:100%;font-size:15px}
table.data th,table.data td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
table.data thead th,table.data tr:first-child th{background:var(--forest);color:#fff}
table.data td:first-child{font-weight:600;background:#f8faf7}
.note{font-size:13px;color:var(--slate);margin:6px 0 0}

/* forms */
label.f{display:block;font-weight:700;margin:16px 0 6px}
textarea,input[type=text],input[type=email],select{width:100%;font:inherit;border:1.5px solid #cdd8d0;border-radius:12px;padding:11px 13px;background:#fff;color:var(--ink)}
textarea{min-height:120px;resize:vertical}
textarea:focus,input:focus,select:focus{outline:3px solid var(--lime-soft);border-color:var(--forest)}
.counter{font-size:12px;color:var(--slate);text-align:right}
.radio{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;margin:8px 0;cursor:pointer;background:#fff}
.radio:has(input:checked){border-color:var(--forest);background:#f3faee}
.radio input{margin-top:4px;accent-color:var(--forest)}
.err{background:var(--bad-soft);color:#8a2318;border-radius:10px;padding:10px 12px;margin:12px 0;font-size:15px}
.okmsg{background:var(--ok-soft);color:#0f5d31;border-radius:10px;padding:10px 12px;margin:12px 0}
.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:16px}

/* verdicts */
.verdict{display:inline-block;padding:4px 12px;border-radius:999px;font-weight:800;font-size:14px}
.v-correct{background:var(--ok-soft);color:#0f5d31}.v-partial{background:var(--warn-soft);color:#7a5210}
.v-incorrect{background:var(--bad-soft);color:#8a2318}.v-pending,.v-unanswered{background:var(--grey-soft);color:#44525b}
.points{list-style:none;padding:0;margin:10px 0}
.points li{display:flex;gap:10px;padding:5px 0;font-size:15px}
.points .m{flex:none;width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font-size:12px;color:#fff}
.points .y{background:var(--ok)}.points .n{background:#b9c3bd}
.model{background:var(--lime-soft);border-radius:12px;padding:14px 16px;white-space:pre-wrap;margin-top:10px}
details.d{margin-top:12px}
details.d summary{cursor:pointer;font-weight:700;color:var(--forest-2)}

/* resources */
.res-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.res{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.res .thumb{aspect-ratio:3/4;background:#e8eee9 center top/cover no-repeat;cursor:zoom-in;border-bottom:1px solid var(--line)}
.res .body{padding:14px;display:flex;flex-direction:column;gap:8px;flex:1}
.res h3{font-size:17px;margin:0}.res p{margin:0;color:var(--slate);font-size:14px;flex:1}
.res .b{display:flex;gap:8px}
.modal{position:fixed;inset:0;background:rgba(10,24,19,.88);z-index:50;display:flex;flex-direction:column}
.modal .bar{display:flex;align-items:center;gap:10px;padding:12px 16px;color:#fff}
.modal .bar b{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.modal .view{flex:1;overflow:auto;text-align:center;padding:0 12px 12px}
.modal .view img{max-width:min(100%,860px);height:auto;background:#fff;border-radius:6px;box-shadow:0 8px 30px rgba(0,0,0,.4)}
.modal .pg{display:flex;gap:8px;justify-content:center;padding:8px 0 14px}
.modal .pg button{width:36px;height:36px;border-radius:50%;border:0;background:#2b5a49;color:#fff;font-weight:700}
.modal .pg button.on{background:var(--lime);color:var(--forest)}

/* materials */
.elbig{border-radius:18px;color:#fff;padding:18px 20px;min-height:150px;position:relative;margin-bottom:16px}
.elbig .s{font-size:64px;font-weight:800;line-height:1}
.elbig .n{font-size:22px;font-weight:700;margin-top:6px}
.elbig .a{position:absolute;right:16px;top:14px;font-size:13px;opacity:.9}
.mat-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.mat-list .el{min-height:130px;aspect-ratio:auto;padding:12px 14px}.mat-list .el .s{font-size:44px}.mat-list .el .n{font-size:15px;left:14px;bottom:12px}

/* quiz */
.qcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:var(--shadow)}
.qcard.right{border-color:#8fd3ab}.qcard.wrong{border-color:#eeb1a9}
.qhead{display:flex;gap:8px;align-items:center;margin-bottom:8px;color:var(--slate);font-size:13px}
.tier{border-radius:999px;padding:2px 10px;font-weight:700;font-size:12px}
.tier.Easy{background:var(--ok-soft);color:#0f5d31}.tier.Medium{background:var(--warn-soft);color:#7a5210}.tier.Hard{background:var(--orange-soft);color:#9b3a07}
.done .radio:has(input:checked){border-color:var(--line);background:#fff}
.done .radio.is-right{border:2px solid #1b8a4b;background:#cdeedb}
.done .radio.is-wrong{border:2px solid #c0392b;background:#f9cfc8}
.radio .mark{margin-left:auto;font-size:13px;white-space:nowrap;padding-left:10px}
.is-right .mark{color:#0f5d31}.is-wrong .mark{color:#9a2418}
.qres{border-top:1px solid var(--line);padding:18px 0}
.qres:first-of-type{border-top:0}
.qres .yours{background:#f6f8f5;border-radius:10px;padding:10px 12px;margin:6px 0 10px}
#qp textarea{min-height:84px}
.progress{position:sticky;top:60px;z-index:10;background:var(--bg);padding:10px 0}
.bar-track{height:8px;border-radius:99px;background:#dfe6e0;overflow:hidden}.bar-fill{height:100%;background:var(--lime);width:0;transition:width .2s}
.score{font-size:54px;font-weight:800;letter-spacing:-.03em}

/* login */
.login{min-height:100vh;display:grid;place-items:center;background:linear-gradient(160deg,var(--forest),var(--forest-2));padding:20px}
.login .box{background:#fff;border-radius:22px;max-width:430px;width:100%;padding:30px;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.login .bolt{width:54px;height:54px;margin-bottom:12px}.login .bolt svg{width:30px;height:30px}
.login h1{font-size:28px}.login p{color:var(--slate);margin:.2em 0 .6em}
.spin{display:inline-block;width:16px;height:16px;border:2.5px solid #fff5;border-top-color:#fff;border-radius:50%;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.muted{color:var(--slate)}
.center{text-align:center}
.loading{padding:60px 0;text-align:center;color:var(--slate)}

.res-head{margin:34px 0 14px;font-size:22px;color:var(--forest)}