:root{
  --bg: oklch(99% 0.002 75);
  --ink: oklch(18% 0.01 75);
  --muted: oklch(45% 0.01 75);
  --faint: oklch(70% 0.01 75);
  --line: oklch(90% 0.005 75);
  --line2: oklch(94% 0.003 75);
  --panel: oklch(97% 0.003 75);
  --accent: oklch(62% 0.19 40);
  --accent-dark: oklch(56% 0.19 40);
  --green: oklch(62% 0.15 150);
  --locked: oklch(80% 0.01 75);
}
*{box-sizing:border-box;}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'IBM Plex Sans',sans-serif;}
::selection{background:oklch(62% 0.19 40 / 0.25);}
.mono{font-family:'IBM Plex Mono',monospace;}
a,.link{color:inherit;cursor:pointer;text-decoration:underline;}
button{font-family:'IBM Plex Sans',sans-serif;}

/* ---------- Login ---------- */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:24px;}
.login-card{width:380px;border:1px solid var(--line);border-radius:8px;padding:36px 32px;background:#fff;}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:28px;}
.brand-badge{width:28px;height:28px;border-radius:6px;background:var(--accent);color:#fff;font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:15px;display:flex;align-items:center;justify-content:center;}
.brand-name{font-family:'IBM Plex Mono',monospace;font-size:14px;font-weight:600;letter-spacing:.06em;}
.login-sub{font-size:13px;color:var(--muted);margin-bottom:24px;line-height:1.5;}
.field{margin-bottom:14px;}
.field label{display:block;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.05em;}
.field input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;font-family:'IBM Plex Mono',monospace;font-size:13px;outline:none;background:var(--panel);}
.field input:focus{border-color:var(--accent);}
.btn-primary{width:100%;padding:11px;border:none;border-radius:6px;background:var(--accent);color:#fff;font-size:14px;font-weight:600;cursor:pointer;}
.btn-primary:hover{background:var(--accent-dark);}
.login-foot{text-align:center;margin-top:16px;font-size:12px;color:var(--muted);}
.login-err{color:var(--accent);font-size:12.5px;margin-top:6px;min-height:16px;}

/* ---------- Home (каталог курсов) ---------- */
.home{min-height:100vh;display:flex;flex-direction:column;}
.home-bar{display:flex;align-items:center;justify-content:space-between;padding:20px 32px;border-bottom:1px solid var(--line);}
.home-body{max-width:1000px;width:100%;margin:0 auto;padding:44px 32px;}
.home-body h1{font-size:26px;margin:0 0 6px;}
.home-lead{font-size:14px;color:var(--muted);margin-bottom:32px;}
.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;}
.course-card{border:1px solid var(--line);border-radius:12px;padding:24px;background:#fff;cursor:pointer;transition:border-color .12s,transform .12s;display:flex;flex-direction:column;}
.course-card:hover{border-color:var(--accent);transform:translateY(-2px);}
.course-card.soon{opacity:.6;cursor:default;}
.course-card.soon:hover{border-color:var(--line);transform:none;}
.cc-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:16px;}
.cc-badge{width:44px;height:44px;border-radius:10px;background:var(--accent);color:#fff;font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:16px;display:flex;align-items:center;justify-content:center;}
.course-card.soon .cc-badge{background:var(--faint);}
.cc-soon{font-family:'IBM Plex Mono',monospace;font-size:10.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:3px 10px;}
.cc-title{font-size:18px;font-weight:600;margin-bottom:3px;}
.cc-sub{font-size:12.5px;color:var(--accent);font-weight:500;margin-bottom:12px;}
.cc-desc{font-size:13px;line-height:1.6;color:var(--muted);margin-bottom:16px;flex:1;}
.cc-meta{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--muted);margin-bottom:10px;}
.cc-progress{display:flex;align-items:center;gap:8px;margin-bottom:14px;}
.cc-progress .bar{flex:1;height:6px;}
.cc-pct{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--muted);}
.cc-go{font-size:13.5px;font-weight:600;color:var(--accent);}

/* ---------- App layout ---------- */
.app{display:flex;min-height:100vh;}
.sidebar{width:248px;flex-shrink:0;border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column;gap:28px;position:sticky;top:0;height:100vh;}
.side-brand{display:flex;align-items:center;gap:9px;padding:0 6px;}
.side-brand .brand-badge{width:24px;height:24px;font-size:12px;border-radius:5px;}
.side-brand .brand-name{font-size:12.5px;letter-spacing:.05em;}
.nav{display:flex;flex-direction:column;gap:2px;}
.nav-item{padding:8px 10px;border-radius:6px;font-size:13.5px;font-weight:500;cursor:pointer;color:var(--ink);}
.nav-item.active{background:var(--panel);color:var(--accent);}
.nav-item.disabled{color:var(--faint);cursor:default;font-weight:400;}
.side-progress{margin-top:auto;padding:12px 10px;border:1px solid var(--line);border-radius:6px;}
.side-progress .lbl{font-family:'IBM Plex Mono',monospace;font-size:10.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:6px;}
.side-progress .num{font-family:'IBM Plex Mono',monospace;font-size:20px;font-weight:600;margin-bottom:8px;}
.bar{height:5px;border-radius:3px;background:oklch(92% 0.003 75);overflow:hidden;}
.bar>span{display:block;height:100%;border-radius:3px;background:var(--accent);}
.logout{margin-top:10px;font-size:11.5px;color:var(--muted);cursor:pointer;text-align:center;}

.main{flex:1;padding:40px 48px;overflow-y:auto;}
.container{max-width:920px;margin:0 auto;}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px;}
h1{font-size:28px;font-weight:600;margin:0 0 8px 0;letter-spacing:-.01em;}
.lead{font-size:14px;color:var(--muted);margin-bottom:28px;}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:16px;}

/* ---------- Dashboard rows ---------- */
.section-list{display:flex;flex-direction:column;gap:8px;}
.section-row{display:flex;align-items:center;gap:16px;padding:16px 18px;border:1px solid var(--line);border-radius:8px;cursor:pointer;background:#fff;}
.section-row:hover{border-color:oklch(80% 0.01 75);}
.section-row .idx{width:36px;flex-shrink:0;font-family:'IBM Plex Mono',monospace;font-size:14px;font-weight:600;color:var(--muted);text-align:center;}
.dot{width:10px;height:10px;border-radius:50%;flex-shrink:0;}
.section-row .info{flex:1;min-width:0;}
.section-row .title{font-size:15px;font-weight:600;margin-bottom:3px;}
.section-row .focus{font-size:12.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.section-row .hours{width:70px;flex-shrink:0;font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--muted);text-align:right;}
.section-row .prog{width:110px;flex-shrink:0;display:flex;align-items:center;gap:8px;}
.section-row .prog .bar{flex:1;}
.section-row .prog .pct{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--muted);width:32px;text-align:right;}

/* ---------- Section view ---------- */
.sec-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:8px;}
.sec-head h1{font-size:26px;}
.sec-hours{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--muted);white-space:nowrap;padding-top:4px;}
.sec-prog{display:flex;align-items:center;gap:10px;margin-bottom:32px;}
.sec-prog .bar{flex:1;max-width:280px;height:6px;}
.sec-prog .pct{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--muted);}
.modules{display:flex;flex-direction:column;gap:20px;}
.module{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff;}
.module-head{padding:12px 16px;background:var(--panel);font-size:13.5px;font-weight:600;border-bottom:1px solid var(--line);}
.lesson-row{display:flex;align-items:center;gap:12px;padding:11px 16px;cursor:pointer;border-bottom:1px solid var(--line2);}
.lesson-row:last-child{border-bottom:none;}
.lesson-row:hover{background:var(--panel);}
.rdot{width:14px;height:14px;border-radius:50%;border:1.5px solid var(--locked);background:transparent;flex-shrink:0;}
.rdot.done{border-color:var(--green);background:var(--green);}
.lesson-row .t{font-size:13.5px;flex:1;}
.lesson-row .type{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;}

/* ---------- Lesson view ---------- */
.lesson-grid{display:flex;gap:32px;}
.lesson-main{flex:1;min-width:0;}
.lesson-main h1{font-size:24px;}
.lesson-type{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:24px;}
.card{border:1px solid var(--line);border-radius:8px;padding:24px;background:#fff;margin-bottom:20px;}
.card :is(p,ul){font-size:14px;line-height:1.7;color:var(--ink);}
.card code{font-family:'IBM Plex Mono',monospace;font-size:13px;background:var(--panel);padding:1px 5px;border-radius:4px;}
.card-label{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--faint);margin-bottom:12px;}

/* ---------- Article (материалы урока) ---------- */
.article{font-size:15px;line-height:1.72;color:var(--ink);margin-bottom:28px;}
.article .lead-in{font-size:16px;line-height:1.65;color:var(--ink);padding:16px 18px;border-left:3px solid var(--accent);background:oklch(62% 0.19 40 / .05);border-radius:0 8px 8px 0;margin-bottom:26px;}
.article h2{font-size:19px;font-weight:600;letter-spacing:-.01em;margin:30px 0 12px;padding-bottom:7px;border-bottom:1px solid var(--line);}
.article h2:first-child{margin-top:0;}
.article h3{font-size:15.5px;font-weight:600;margin:22px 0 8px;}
.article p{margin:0 0 14px;}
.article ul,.article ol{margin:0 0 16px;padding-left:22px;}
.article li{margin:6px 0;}
.article code{font-family:'IBM Plex Mono',monospace;font-size:.86em;background:var(--panel);padding:1px 6px;border-radius:4px;border:1px solid var(--line);}
.article u{text-decoration:none;border-bottom:2px solid oklch(62% 0.19 40 / .35);}
.article .kw{font-weight:600;color:var(--accent);}

/* таблицы */
.article table{width:100%;border-collapse:collapse;margin:6px 0 20px;font-size:13.5px;}
.article th,.article td{text-align:left;padding:9px 12px;border:1px solid var(--line);}
.article th{background:var(--panel);font-weight:600;font-size:12.5px;}
.article tbody tr:nth-child(even){background:oklch(98% 0.002 75);}

/* схема-цепочка (flow) */
.article .flow{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:4px 0 24px;}
.article .flow span{font-family:'IBM Plex Mono',monospace;font-size:12px;padding:6px 11px;background:#fff;border:1px solid var(--line);border-radius:6px;position:relative;}
.article .flow span:not(:last-child)::after{content:"→";margin-left:6px;margin-right:-2px;color:var(--faint);}

/* врезки-callouts */
.article .callout{border-radius:8px;padding:13px 16px;margin:0 0 18px;font-size:14px;line-height:1.6;border:1px solid var(--line);}
.article .callout b{font-weight:600;}
.article .callout.atk{background:oklch(62% 0.19 40 / .07);border-color:oklch(62% 0.19 40 / .28);}
.article .callout.atk b{color:var(--accent-dark);}
.article .callout.atk::before{content:"⚔️ ";}
.article .callout.info{background:oklch(70% 0.1 250 / .09);border-color:oklch(70% 0.1 250 / .28);}
.article .callout.info::before{content:"ℹ️ ";}
.article .callout.tip{background:oklch(62% 0.15 150 / .09);border-color:oklch(62% 0.15 150 / .3);}
.article .callout.tip::before{content:"💡 ";}
.article .callout.warn{background:oklch(75% 0.15 75 / .12);border-color:oklch(75% 0.15 75 / .4);}
.article .callout.warn::before{content:"⚠️ ";}

/* рисунки / схемы (inline SVG) */
.article figure.fig{margin:14px 0 26px;}
.article figure.fig svg{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:10px;background:oklch(99.3% 0.001 75);padding:16px;}
.article figure.fig figcaption{font-size:12.5px;color:var(--muted);text-align:center;margin-top:9px;line-height:1.5;}

.english h3{font-size:14px;font-weight:600;margin:0 0 4px 0;display:flex;align-items:center;gap:8px;}
.english .sub{font-size:12px;color:var(--muted);margin-bottom:14px;}
.eng-item{display:grid;grid-template-columns:150px 1fr;gap:10px;padding:8px 0;border-bottom:1px solid var(--line2);align-items:baseline;}
.eng-item:last-child{border-bottom:none;}
.eng-term{font-family:'IBM Plex Mono',monospace;font-size:13px;font-weight:600;color:var(--accent);}
.eng-ru{font-size:13px;}
.eng-ex{grid-column:2;font-size:12px;color:var(--muted);font-style:italic;margin-top:2px;}

/* Tasks */
.task{border:1px solid var(--line);border-radius:8px;padding:18px 20px;background:#fff;margin-bottom:14px;}
.task-badge{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:10.5px;text-transform:uppercase;letter-spacing:.05em;padding:2px 7px;border-radius:4px;margin-bottom:10px;}
.task-badge.cmd{background:oklch(62% 0.19 40 / .12);color:var(--accent);}
.task-badge.flag{background:oklch(62% 0.15 150 / .14);color:var(--green);}
.task-badge.open{background:oklch(70% 0.12 250 / .16);color:oklch(50% 0.14 250);}
.task-prompt{font-size:14px;line-height:1.6;margin-bottom:12px;}
.task-input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;font-family:'IBM Plex Mono',monospace;font-size:13px;outline:none;background:var(--panel);}
.task textarea.task-input{min-height:90px;resize:vertical;font-family:'IBM Plex Sans',sans-serif;}
.task-input:focus{border-color:var(--accent);}
.task-actions{display:flex;align-items:center;gap:12px;margin-top:10px;}
.btn-check{padding:8px 16px;border:none;border-radius:6px;background:var(--accent);color:#fff;font-size:13px;font-weight:600;cursor:pointer;}
.btn-check:hover{background:var(--accent-dark);}
.btn-check:disabled{opacity:.6;cursor:default;}
.feedback{font-size:13px;line-height:1.55;margin-top:12px;padding:11px 13px;border-radius:6px;white-space:pre-wrap;}
.feedback.ok{background:oklch(62% 0.15 150 / .12);color:oklch(38% 0.12 150);border:1px solid oklch(62% 0.15 150 / .3);}
.feedback.bad{background:oklch(62% 0.19 40 / .09);color:var(--accent-dark);border:1px solid oklch(62% 0.19 40 / .25);}
.feedback.pending{background:oklch(70% 0.06 250 / .12);color:oklch(45% 0.1 250);border:1px solid oklch(70% 0.1 250 / .3);}

.lesson-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.btn-ghost{padding:9px 16px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:13px;cursor:pointer;}
.btn-ghost:disabled{opacity:.4;cursor:default;}
.btn-complete{padding:9px 18px;border:none;border-radius:6px;background:var(--accent);color:#fff;font-size:13px;font-weight:600;cursor:pointer;}
.btn-complete.done{background:var(--green);}

.toc{width:220px;flex-shrink:0;}
.toc .lbl{font-family:'IBM Plex Mono',monospace;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:10px;}
.toc-list{display:flex;flex-direction:column;gap:2px;max-height:72vh;overflow-y:auto;}
.toc-item{display:flex;align-items:center;gap:8px;padding:7px 8px;border-radius:5px;cursor:pointer;}
.toc-item:hover{background:var(--panel);}
.toc-item.active{background:var(--panel);}
.toc-item .cdot{width:11px;height:11px;border-radius:50%;border:1.5px solid var(--locked);background:transparent;flex-shrink:0;}
.toc-item .cdot.done{border-color:var(--green);background:var(--green);}
.toc-item .tt{font-size:12.5px;color:var(--muted);}
.toc-item.active .tt{color:var(--ink);}

/* ---------- Технический английский (карточка + тренажёр) ---------- */
.eng-card .cc-badge{background:oklch(56% 0.13 250);}
.cc-flag{font-size:22px;line-height:1;}
.eng-screen .home-body{max-width:900px;}
.eng-top-actions{display:flex;align-items:center;gap:18px;}
.eng-back{font-size:12.5px;color:var(--muted);cursor:pointer;}
.eng-back:hover{color:var(--accent);}
.eng-screen .logout{margin-top:0;}
.eng-head{margin-bottom:26px;}
.eng-progress{font-size:14px;color:var(--muted);}
.eng-progress b{color:var(--ink);font-family:'IBM Plex Mono',monospace;font-size:16px;}
.eng-bar{max-width:280px;height:6px;margin-top:8px;}
.eng-hint{font-size:12.5px;color:var(--faint);margin-top:10px;}
.eng-board{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start;}
.eng-col{display:flex;flex-direction:column;gap:8px;}
.eng-col-h{font-family:'IBM Plex Mono',monospace;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:2px;}
.eng-chip{text-align:left;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:14px;cursor:pointer;transition:border-color .1s,background .1s;color:var(--ink);}
.eng-chip:hover{border-color:var(--accent);}
.eng-chip[data-en]{font-family:'IBM Plex Mono',monospace;font-weight:600;}
.eng-chip.sel{border-color:var(--accent);background:oklch(62% 0.19 40 / .08);box-shadow:inset 0 0 0 1px var(--accent);}
.eng-chip.ok{border-color:var(--green);background:oklch(62% 0.15 150 / .14);color:oklch(38% 0.12 150);}
.eng-chip.bad{border-color:var(--accent);background:oklch(62% 0.19 40 / .1);animation:engshake .38s;}
@keyframes engshake{0%,100%{transform:translateX(0);}20%{transform:translateX(-6px);}40%{transform:translateX(6px);}60%{transform:translateX(-4px);}80%{transform:translateX(4px);}}
.eng-done-card{text-align:center;padding:44px 24px;border:1px solid var(--line);border-radius:12px;background:#fff;max-width:520px;margin:8px auto;}
.eng-done-emoji{font-size:42px;}
.eng-done-title{font-size:19px;font-weight:600;margin:12px 0 6px;}
.eng-done-sub{font-size:13.5px;color:var(--muted);line-height:1.6;margin-bottom:20px;}

@media (max-width:820px){
  .sidebar{display:none;}
  .main{padding:24px 18px;}
  .lesson-grid{flex-direction:column;}
  .toc{width:100%;}
  .eng-board{gap:10px;}
  .eng-chip{padding:11px 12px;font-size:13.5px;}
}