/* =========================================================
   MyPhatshala: lesson page components (used by every lesson)
   Load after style.css
   ========================================================= */
:root{
  --code-bg:#1E2A24; --code-ink:#E8E6DE; --code-dim:#7F8C86;
  --tk-kw:#F5A15C; --tk-str:#9FD3B8; --tk-num:#F3C969; --tk-com:#7F8C86; --tk-type:#8DB6F2; --tk-fn:#E9B8F2;
  --hl-line:rgba(245,199,126,.16);
}

/* ---------- layout ---------- */
.lesson-hero{padding:32px 0 26px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,color-mix(in srgb,var(--track,#E8772E) 10%,var(--paper)),var(--paper))}
.lesson-hero h1{font-size:clamp(1.9rem,4.4vw,2.9rem);margin:6px 0 12px}
.lesson-hero .lead{font-size:1.1rem;color:var(--ink-2);max-width:66ch;margin:0 0 16px}
.lesson-meta{display:flex;flex-wrap:wrap;gap:8px}
.lesson-meta span{font-size:.84rem;background:var(--card);border:1px solid var(--line);padding:4px 10px;border-radius:8px}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:40px;padding:28px 0 40px}
@media (max-width:980px){ .lesson-layout{grid-template-columns:minmax(0,1fr)} .lesson-side{order:-1;min-width:0} }
.lesson-main{min-width:0;max-width:820px}
.lesson-side{display:flex;flex-direction:column;gap:16px}
@media (min-width:981px){ .lesson-side{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 100px);overflow:auto} }

/* table of contents */
.toc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px}
.toc h4{font-family:var(--font-head);margin:2px 6px 8px;font-size:1rem}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t}
.toc a{display:flex;gap:10px;align-items:center;padding:7px 8px;border-radius:9px;text-decoration:none;font-size:.9rem;color:var(--ink-2)}
.toc a::before{content:counter(t);flex:0 0 22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.72rem;font-weight:700;background:var(--paper-2);color:var(--ink-3)}
.toc a:hover{background:var(--paper-2);color:var(--ink)}
.toc a.is-current{background:color-mix(in srgb,var(--track,#E8772E) 12%,transparent);color:var(--ink);font-weight:700}
.toc a.is-current::before{background:var(--track,#E8772E);color:#fff}
@media (max-width:980px){
  .toc ol{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px}
  .toc a{white-space:nowrap;border:1px solid var(--line)}
  .lesson-side .ad-slot,.lesson-side .outline{display:none}
}
.read-progress{position:fixed;top:0;left:0;height:3px;background:var(--track,#E8772E);width:0;z-index:70;transition:width .1s}

/* ---------- parts ---------- */
.part{padding:34px 0 10px;scroll-margin-top:76px}
.part + .part{border-top:1px dashed var(--line)}
.part-label{display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--track,#E8772E)}
.part-label b{width:24px;height:24px;border-radius:50%;background:var(--track,#E8772E);color:#fff;display:grid;place-items:center;font-size:.75rem;letter-spacing:0}
.part h2{font-size:clamp(1.5rem,3vw,2rem);margin:8px 0 14px}
.part h3{font-size:1.2rem;margin:26px 0 10px}
.part p{margin:0 0 14px}
.part ul.plain{margin:0 0 14px;padding-left:20px}
.part ul.plain li{margin-bottom:6px}

/* callouts */
.callout{display:flex;gap:12px;border-radius:12px;padding:14px 16px;margin:16px 0;border:1px solid var(--line);background:var(--card)}
.callout svg{flex:0 0 22px;width:22px;height:22px;margin-top:2px}
.callout p{margin:0}
.callout--tip{background:var(--green-soft);border-color:transparent}.callout--tip svg{color:var(--green)}
.callout--exam{background:var(--blue-soft);border-color:transparent}.callout--exam svg{color:var(--blue)}
.callout--warn{background:var(--saffron-soft);border-color:transparent}.callout--warn svg{color:var(--saffron)}

/* ---------- story (comic panels) ---------- */
.story{display:grid;gap:14px}
.panel{display:grid;grid-template-columns:64px 1fr;gap:14px;align-items:start}
.panel--right{grid-template-columns:1fr 64px}
.panel--right .avatar{order:2}
.avatar{width:64px;height:64px;border-radius:50%;background:var(--paper-2);border:2px solid var(--line);overflow:hidden}
.avatar svg{width:100%;height:100%}
.bubble{position:relative;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px 16px;box-shadow:var(--shadow)}
.bubble b.who{display:block;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-bottom:2px}
.bubble p{margin:0}
.panel--right .bubble{background:color-mix(in srgb,var(--track,#E8772E) 9%,var(--card))}
.narration{font-style:italic;color:var(--ink-2);border-left:3px solid var(--line);padding:4px 0 4px 14px;margin:4px 0}
.scene{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;margin:6px 0}
.scene svg{width:100%;height:auto}

/* ---------- definition ---------- */
.def{border-radius:16px;overflow:hidden;border:1px solid var(--line);margin:8px 0 16px}
.def__formal{background:var(--board);color:var(--chalk);padding:20px 22px}
.def__formal small,.def__simple small{display:block;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;font-weight:700;margin-bottom:6px}
.def__formal small{color:#F5C77E}
.def__formal p{margin:0;font-family:var(--font-head);font-size:1.18rem;line-height:1.5}
.def__simple{background:var(--card);padding:18px 22px}
.def__simple small{color:var(--green)}
.def__simple p{margin:0;font-size:1.05rem}
.terms{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin:12px 0}
.term{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.term b{display:block;font-family:var(--font-code);font-size:.9rem;color:var(--track,#E8772E)}
.term span{font-size:.9rem;color:var(--ink-2)}
.facts{width:100%;border-collapse:collapse;margin:10px 0 16px;font-size:.95rem;background:var(--card);border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.facts th,.facts td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.facts th{width:36%;color:var(--ink-2);font-weight:700;background:var(--paper-2)}
.facts tr:last-child th,.facts tr:last-child td{border-bottom:0}
.table-wrap{overflow-x:auto}
table.compare{width:100%;border-collapse:collapse;font-size:.92rem;min-width:520px;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
table.compare th,table.compare td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
table.compare thead th{background:var(--paper-2);font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-2)}

/* ---------- type / use cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:12px 0 18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.card svg.ic{width:40px;height:40px;margin-bottom:10px}
.card h4{font-family:var(--font-head);font-size:1.08rem;margin:0 0 4px}
.card p{margin:0;font-size:.92rem;color:var(--ink-2)}
.card .tag{display:inline-block;margin-top:10px;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--track,#E8772E)}

.usecase{display:grid;grid-template-columns:150px 1fr;gap:18px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin-bottom:14px}
@media (max-width:620px){ .usecase{grid-template-columns:1fr} .usecase .uc-art{max-width:200px} }
.uc-art{background:var(--paper-2);border-radius:12px;display:grid;place-items:center;padding:10px}
.uc-art svg{width:100%;height:auto}
.usecase h4{font-family:var(--font-head);font-size:1.15rem;margin:0 0 6px}
.usecase p{margin:0 0 8px;font-size:.95rem;color:var(--ink-2)}
.uc-flow{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:.8rem}
.uc-flow span{background:var(--paper-2);border-radius:6px;padding:3px 8px}
.uc-flow span.java{background:var(--track,#E8772E);color:#fff;font-weight:700}
.uc-flow i{color:var(--ink-3);font-style:normal}

/* ---------- stepper ---------- */
.stepper{list-style:none;margin:10px 0;padding:0;counter-reset:s}
.stepper > li{counter-increment:s;position:relative;padding:0 0 18px 52px}
.stepper > li::before{content:counter(s);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:700;background:var(--card);border:2px solid var(--track,#E8772E);color:var(--track,#E8772E)}
.stepper > li:not(:last-child)::after{content:"";position:absolute;left:17px;top:38px;bottom:2px;width:2px;background:var(--line)}
.stepper h4{font-size:1.06rem;margin:6px 0 6px;font-family:var(--font-body)}
.stepper p{margin:0 0 8px;color:var(--ink-2);font-size:.95rem}
.behind{display:block;font-size:.88rem;background:var(--green-soft);border-radius:8px;padding:8px 12px;margin-top:6px}
.behind::before{content:"Behind the screen: ";font-weight:700;color:var(--green)}

/* ---------- code ---------- */
.code{position:relative;background:var(--code-bg);color:var(--code-ink);border-radius:14px;margin:12px 0 18px;overflow:hidden}
.code__bar{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;background:rgba(255,255,255,.04);font-size:.78rem;color:var(--code-dim)}
.code__bar .dots{display:flex;gap:6px}.code__bar .dots i{width:10px;height:10px;border-radius:50%;background:#E8772E}.code__bar .dots i:nth-child(2){background:#F5C77E}.code__bar .dots i:nth-child(3){background:#4FB487}
.copy-btn{border:1px solid rgba(255,255,255,.15);background:transparent;color:var(--code-ink);font:inherit;font-size:.75rem;padding:3px 10px;border-radius:6px;cursor:pointer}
.copy-btn:hover{background:rgba(255,255,255,.08)}
.code pre{margin:0;padding:14px 16px;overflow-x:auto;font:14px/1.7 var(--font-code)}
.code pre code{background:none;padding:0;font-size:inherit;color:inherit}
.tk-kw{color:var(--tk-kw)}.tk-str{color:var(--tk-str)}.tk-num{color:var(--tk-num)}.tk-com{color:var(--tk-com);font-style:italic}.tk-type{color:var(--tk-type)}.tk-fn{color:var(--tk-fn)}
.output{background:#0F1512;color:#B9F5D0;font:13.5px/1.6 var(--font-code);padding:12px 16px;border-top:1px solid rgba(255,255,255,.06);white-space:pre-wrap}
.output::before{content:"OUTPUT";display:block;font-size:.68rem;letter-spacing:.12em;color:var(--code-dim);margin-bottom:4px}
.anno{list-style:none;padding:0;margin:0 0 18px;display:grid;gap:8px}
.anno li{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:.93rem}
.anno code{white-space:nowrap}

/* ---------- player controls (shared by animation + tracer) ---------- */
.controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 14px;border-top:1px solid var(--line);background:var(--paper-2)}
.ctl{border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:700;font-size:.88rem;padding:7px 14px;border-radius:10px;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.ctl:hover:not(:disabled){border-color:var(--ink)}
.ctl:disabled{opacity:.4;cursor:default}
.ctl--play{background:var(--track,#E8772E);border-color:var(--track,#E8772E);color:#fff}
.ctl svg{width:14px;height:14px}
.frame-dots{display:flex;gap:6px;margin-left:auto}
.frame-dots button{width:10px;height:10px;border-radius:50%;border:0;background:var(--line);cursor:pointer;padding:0}
.frame-dots button.on{background:var(--track,#E8772E);transform:scale(1.25)}
.frame-count{font-size:.82rem;color:var(--ink-3);font-family:var(--font-code)}

/* ---------- two-view animation ---------- */
.anim{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:12px 0 18px;box-shadow:var(--shadow)}
.anim__title{padding:12px 16px;font-weight:700;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.anim__title span{font-weight:400;color:var(--ink-3);font-size:.85rem}
.anim__views{display:grid;grid-template-columns:1fr 1fr}
@media (max-width:760px){ .anim__views{grid-template-columns:1fr} }
.view{padding:12px 14px 14px;min-width:0}
.view + .view{border-left:1px solid var(--line)}
@media (max-width:760px){ .view + .view{border-left:0;border-top:1px solid var(--line)} }
.view__tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border-radius:7px;margin-bottom:8px}
.view--see .view__tag{background:var(--blue-soft);color:var(--blue)}
.view--behind .view__tag{background:var(--green-soft);color:var(--green)}
.view svg{width:100%;height:auto;display:block}
.view svg text{font-family:var(--font-body)}
.view svg .mono{font-family:var(--font-code)}
.caption{min-height:4.6em;font-size:.93rem;color:var(--ink-2);margin-top:8px;line-height:1.5}
.caption b{color:var(--ink)}
/* frame-driven SVG elements */
.anim [data-on]{opacity:0;transition:opacity .45s ease,transform .6s ease}
.anim [data-on].on{opacity:1}
.anim [data-pos]{transition:transform .8s cubic-bezier(.4,.1,.2,1)}
.anim .pulse.on{animation:mp-pulse 1.4s ease-in-out infinite}
@keyframes mp-pulse{50%{opacity:.45}}
/* svg palette (theme-aware) */
.s-card{fill:var(--paper-2);stroke:var(--line);stroke-width:1.5}
.s-card2{fill:var(--card);stroke:var(--line);stroke-width:1.5}
.s-board{fill:var(--board)}
.s-ink{fill:var(--ink)}.s-ink2{fill:var(--ink-2)}.s-ink3{fill:var(--ink-3)}
.s-chalk{fill:#EDEBE3}.s-kw{fill:#F5A15C}.s-str{fill:#9FD3B8}
.s-acc{fill:var(--track,#E8772E)}.s-acc-stroke{stroke:var(--track,#E8772E);fill:none;stroke-width:2.5}
.s-green{fill:var(--green)}.s-blue{fill:var(--blue)}.s-red{fill:#D64545}
.s-wire{stroke:var(--line);stroke-width:2.5;fill:none;stroke-dasharray:5 5}
.s-line{stroke:var(--ink-3);stroke-width:1.5;fill:none}
.s-soft-green{fill:var(--green-soft)}.s-soft-blue{fill:var(--blue-soft)}.s-soft-acc{fill:var(--saffron-soft)}
.s-wm{fill:var(--ink-3);opacity:.35;font-size:9px}

/* ---------- tracer ---------- */
.tracer{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:12px 0 18px;box-shadow:var(--shadow)}
.tracer__grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
@media (max-width:820px){ .tracer__grid{grid-template-columns:1fr} }
.tracer__code{background:var(--code-bg);color:var(--code-ink);font:13.5px/1.75 var(--font-code);padding:12px 0;overflow-x:auto}
.tline{display:flex;padding:0 14px 0 0;white-space:pre;transition:background .25s}
.tline .ln{flex:0 0 38px;text-align:right;padding-right:12px;color:var(--code-dim);user-select:none}
.tline.is-active{background:var(--hl-line);box-shadow:inset 3px 0 0 #F5C77E}
.tline.is-done{opacity:.6}
.tracer__state{padding:14px;display:grid;gap:10px;align-content:start}
.mem{border:1px solid var(--line);border-radius:12px;overflow:hidden}
.mem h5{margin:0;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;padding:6px 10px;background:var(--paper-2);color:var(--ink-2);display:flex;justify-content:space-between}
.mem h5 em{font-style:normal;text-transform:none;letter-spacing:0;color:var(--ink-3)}
.mem__body{padding:8px 10px;min-height:38px;font:13px/1.5 var(--font-code)}
.frame{border:1.5px solid var(--blue);border-radius:8px;padding:6px 8px;margin-bottom:6px;background:var(--blue-soft)}
.frame b{display:block;font-size:.75rem;color:var(--blue);margin-bottom:2px;font-family:var(--font-body)}
.var{display:flex;justify-content:space-between;gap:10px}
.var.new{animation:mp-flash 1s ease}
@keyframes mp-flash{0%{background:#F5C77E66}100%{background:transparent}}
.obj{display:inline-block;border:1.5px solid var(--green);background:var(--green-soft);border-radius:8px;padding:4px 8px;margin:0 6px 6px 0}
.console{background:#0F1512;color:#B9F5D0;font:13px/1.6 var(--font-code);padding:8px 10px;min-height:44px;white-space:pre-wrap}
.empty-note{color:var(--ink-3);font-style:italic;font-family:var(--font-body);font-size:.85rem}
.tracer__note{font-size:.93rem;color:var(--ink-2);background:var(--saffron-soft);border-radius:10px;padding:10px 12px;line-height:1.5}
.tracer__note b{color:var(--ink)}

/* ---------- runner ---------- */
.runner{border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:12px 0 18px;background:var(--card)}
.runner__tasks{display:flex;gap:8px;flex-wrap:wrap;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--paper-2)}
.runner__tasks button{border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-size:.86rem;padding:6px 12px;border-radius:99px;cursor:pointer}
.runner__tasks button.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.runner__hint{padding:10px 16px;font-size:.92rem;color:var(--ink-2);border-bottom:1px solid var(--line)}
.runner__stage{position:relative;min-height:440px;background:var(--code-bg)}
.runner__stage iframe{display:block;width:100%;height:480px;border:0}
.runner__gate{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:20px;color:var(--code-ink)}
.runner__gate p{max-width:46ch;margin:10px auto 16px;color:#B9C4BE;font-size:.92rem}
.runner__gate .btn{border-color:#F5C77E;background:#F5C77E;color:#1F2B26}
.runner__foot{padding:8px 14px;font-size:.78rem;color:var(--ink-3)}

/* ---------- quiz ---------- */
.quiz{display:grid;gap:14px;margin:12px 0}
.q{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.q > p{font-weight:700;margin:0 0 10px}
.q > p span{color:var(--ink-3);font-weight:400;margin-right:6px}
.opts{display:grid;gap:8px}
.opt{text-align:left;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);font:inherit;font-size:.95rem;padding:10px 14px;border-radius:10px;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--ink-2)}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--green);background:var(--green-soft)}
.opt.wrong{border-color:#D64545;background:color-mix(in srgb,#D64545 12%,var(--card))}
.q .why{margin-top:10px;font-size:.92rem;color:var(--ink-2);display:none}
.q.done .why{display:block}
.score{font-weight:700;padding:12px 16px;border-radius:12px;background:var(--paper-2);text-align:center}

/* ---------- revision + faq + nav ---------- */
.revision{background:var(--board);color:var(--chalk);border-radius:18px;padding:22px;position:relative}
.revision::before{content:"";position:absolute;inset:10px;border:2px dashed rgba(237,235,227,.16);border-radius:12px;pointer-events:none}
.revision h3{color:#F5C77E;margin:0 0 10px}
.revision ul{margin:0;padding-left:20px}
.revision li{margin-bottom:6px;color:#DAD7CD}
.revision code{background:#2c3a33;color:#9FD3B8}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:8px}
.faq summary{cursor:pointer;padding:12px 16px;font-weight:700}
.faq details p{margin:0;padding:0 16px 14px;color:var(--ink-2)}
.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:30px 0 10px}
.lesson-nav a,.lesson-nav span{display:block;border:1.5px solid var(--line);border-radius:14px;padding:14px 16px;text-decoration:none;background:var(--card)}
.lesson-nav a:hover{border-color:var(--track,#E8772E)}
.lesson-nav small{display:block;color:var(--ink-3);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}
.lesson-nav .next{text-align:right}
.lesson-nav span{opacity:.55}
.outline{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;font-size:.88rem}
.outline h4{font-family:var(--font-head);margin:0 0 8px;font-size:1rem}
.outline a,.outline span{display:block;padding:4px 0;text-decoration:none;color:var(--ink-2)}
.outline span{color:var(--ink-3)}
.outline a.here{color:var(--track,#E8772E);font-weight:700}
.view svg text,.scene svg text{white-space:pre}
@media (max-width:600px){ .anno li{grid-template-columns:1fr;gap:4px} .anno code{white-space:normal;word-break:break-word} }
.lesson-side .ad-slot{margin:0;width:100%}

/* ---------- scenario-based interview questions (industry) ---------- */
.scn-intro{color:var(--ink-2);margin:4px 0 12px}
.scenarios{display:grid;gap:14px;margin:12px 0 8px}
.scn{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--track,#E8772E);border-radius:12px;padding:16px 18px;min-width:0}
.scn__head{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.scn__tag{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:3px 8px;border-radius:6px;background:var(--blue-soft);color:var(--blue)}
.scn__tag--level{background:var(--green-soft);color:var(--green)}
.scn h4{font-family:var(--font-head);font-size:1.08rem;margin:0 0 6px}
.scn p,.scn li{overflow-wrap:anywhere}
.scn__situation{margin:0 0 10px;color:var(--ink-2)}
.scn__look{margin:0 0 10px;font-size:.92rem;background:var(--saffron-soft);border-radius:8px;padding:8px 12px}
.scn details summary{cursor:pointer;font-weight:700;color:var(--track,#E8772E)}
.scn__answer{margin-top:10px;font-size:.95rem}
.scn__answer p{margin:0 0 8px}
.scn__answer ol,.scn__answer ul{padding-left:20px;margin:6px 0}
.scn__answer li{margin-bottom:4px}
.scn__avoid{margin:10px 0 0 !important;font-size:.9rem;padding:8px 12px;border-radius:8px;background:color-mix(in srgb,#D64545 10%,var(--card));border:1px solid color-mix(in srgb,#D64545 30%,var(--line))}

/* long inline code must never widen the page on phones */
.lesson-main :not(pre) > code{overflow-wrap:anywhere}
.usecase > div{min-width:0}

/* tracer wraps long lines instead of scrolling sideways */
.tracer__code{overflow-x:hidden}
.tline{white-space:pre-wrap}
.tline > span:last-child{min-width:0;overflow-wrap:anywhere}

/* ---------- practice problems ---------- */
.prob-intro{color:var(--ink-2);margin:4px 0 12px}
.probs{display:grid;gap:12px;margin:12px 0 8px}
.prob{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;min-width:0}
.prob__head{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px}
.prob__num{font:700 .8rem var(--font-code);color:var(--ink-3)}
.prob__tag{font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:2px 8px;border-radius:6px}
.prob__tag--easy{background:var(--green-soft);color:var(--green)}
.prob__tag--medium{background:var(--blue-soft);color:var(--blue)}
.prob__tag--business{background:var(--saffron-soft);color:var(--track,#E8772E)}
.prob h4{font-family:var(--font-head);font-size:1.05rem;margin:0;flex-basis:100%}
.prob p{margin:0 0 8px;overflow-wrap:anywhere}
.prob__io{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px;margin:8px 0 10px}
@media (max-width:560px){.prob__io{grid-template-columns:minmax(0,1fr)}}
.prob__io > div{background:var(--paper-2);border-radius:8px;padding:8px 10px;min-width:0}
.prob__io small{display:block;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-3);margin-bottom:4px}
.prob__io pre{margin:0;font:13px/1.5 var(--font-code);white-space:pre-wrap;overflow-wrap:anywhere}
.prob__sol summary{cursor:pointer;font-weight:700;color:var(--track,#E8772E)}
.prob__sol[open] summary{margin-bottom:8px}
.prob__sol ol,.prob__sol ul{padding-left:20px;margin:6px 0}

/* Inline code on dark "board" surfaces — readable in light AND dark themes */
.def__formal code,.revision code,.story-card code,.site-footer code{background:rgba(255,255,255,.14);color:#F5C77E;border:1px solid rgba(255,255,255,.18)}

/* Worked examples: business problem + live solution + JVM memory trace */
.wx-intro{color:var(--ink-2);margin:0 0 14px}
.wx{background:var(--card);border:1px solid var(--line);border-top:4px solid var(--track,#E8772E);border-radius:14px;padding:18px 18px 16px;margin:0 0 22px;min-width:0}
.wx__head{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:6px}
.wx__num{font:700 .74rem var(--font-code);letter-spacing:.04em;text-transform:uppercase;padding:3px 9px;border-radius:999px;background:var(--track,#E8772E);color:#fff}
.wx__tag{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:3px 8px;border-radius:6px;background:var(--blue-soft);color:var(--blue)}
.wx h4{margin:4px 0 10px;font-size:1.12rem}
.wx__label{margin:14px 0 6px;font-size:.74rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--track,#E8772E)}
.wx__problem p{margin:0 0 6px}
.wx__approach ol{margin:0;padding-left:1.3em}
.wx__approach li{margin:3px 0}
.wx__how{font-size:.9rem;color:var(--ink-2);margin:0 0 8px}
.wx .runner,.wx .tracer{margin-top:4px}
.tracer .obj b{color:inherit;font-weight:800}
@media (max-width:560px){.wx{padding:14px 12px}}

/* ---------- one-view animated example (added 16 Oct 2026) ---------- */
.anim--one .anim__views{grid-template-columns:1fr}
.anim--one .view svg{max-width:560px;margin:0 auto}
.anim--one .caption{max-width:560px;margin-left:auto;margin-right:auto}
.view--story .view__tag{background:var(--saffron-soft);color:var(--ink)}
.anim-intro{color:var(--ink-2);margin:4px 0 6px}

/* ---------- modifier lab (.modlab): one member, switch its access level, see what compiles and prints ---------- */
.modlab{border:1px solid var(--line);border-radius:16px;background:var(--card);margin:14px 0 22px;overflow:hidden}
.modlab__bar{display:flex;gap:8px;flex-wrap:wrap;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--paper-2)}
.modlab__bar b{width:100%;font-size:.84rem;color:var(--ink-2)}
.modlab__bar button{border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:600 .9rem var(--font-code);padding:6px 14px;border-radius:99px;cursor:pointer}
.modlab__bar button.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.modlab:not(.is-js) .modlab__bar{display:none}
.modlab__panel{padding:14px 16px 6px}
.modlab.is-js .modlab__panel:not(.on){display:none}
.modlab:not(.is-js) .modlab__panel+.modlab__panel{border-top:1px dashed var(--line)}
.modlab__panel>h4{margin:2px 0 6px;font-family:var(--font-head);font-size:1.08rem}
.modlab__score{display:inline-block;font-size:.82rem;font-weight:700;padding:3px 10px;border-radius:99px;background:var(--saffron-soft);color:var(--ink)}
.modlab__rows{list-style:none;margin:10px 0;padding:0;display:grid;gap:8px}
.modlab__row{border:1.5px solid var(--line);border-radius:12px;padding:9px 12px;display:grid;grid-template-columns:28px minmax(0,1fr);gap:2px 8px;align-items:start}
.modlab__row .mk{grid-row:span 3;font-size:1.15rem;font-weight:700;line-height:1.3}
.modlab__row.ok{border-color:color-mix(in srgb,var(--green) 45%,var(--line));background:var(--green-soft)}
.modlab__row.ok .mk{color:var(--green)}
.modlab__row.no{border-color:color-mix(in srgb,var(--red) 45%,var(--line));background:color-mix(in srgb,var(--red) 8%,var(--card))}
.modlab__row.no .mk{color:var(--red)}
.modlab__row .who{font-weight:700}
.modlab__row .who small{font-weight:400;color:var(--ink-2)}
.modlab__row code.use{font-size:.84rem;overflow-wrap:anywhere}
.modlab__row .res{font:12.5px/1.5 var(--font-code);white-space:pre-wrap;overflow-wrap:anywhere;color:var(--ink)}
.modlab__why{font-size:.94rem}
.modlab__sum{min-width:520px}
.modlab__sum td:first-child{white-space:nowrap}
/* "Run on your PC" panels: real commands with output recorded from a real run */
.pcrun{border:1px dashed var(--track);border-radius:12px;padding:12px 14px 4px;margin:14px 0;background:var(--card)}
.pcrun h4{margin:0 0 8px;font-size:1rem}
.pcrun h4::before{content:"Run on your PC";display:inline-block;margin-right:8px;padding:2px 8px;border-radius:999px;background:var(--track);color:#fff;font:700 11px/1.6 var(--font-body,inherit);letter-spacing:.02em;vertical-align:2px}
.pcrun .muted{font-size:.9rem;margin:6px 0 10px}
/* ---------- level ladder (.modlab.levels): the same idea at Beginner / Intermediate / Advanced depth ---------- */
.levels .modlab__bar button{font-family:var(--font-body)}
.levels .modlab__bar button[data-mod="b"].on{background:var(--green);border-color:var(--green);color:#fff}
.levels .modlab__bar button[data-mod="i"].on{background:var(--blue);border-color:var(--blue);color:#fff}
.levels .modlab__bar button[data-mod="a"].on{background:#6B4FBB;border-color:#6B4FBB;color:#fff}
.levels .modlab__panel ul{margin:6px 0 10px;padding-left:1.2em}
.levels .modlab__panel li{margin:4px 0}
.lvl{display:inline-block;font:700 .7rem/1.6 var(--font-body);letter-spacing:.03em;text-transform:uppercase;padding:2px 9px;border-radius:999px;vertical-align:2px}
.lvl--b{background:var(--green-soft);color:var(--green)}
.lvl--i{background:var(--blue-soft);color:var(--blue)}
.lvl--a{background:color-mix(in srgb,#6B4FBB 16%,var(--card));color:#7C5CD6}
.prob__tag--advanced{background:color-mix(in srgb,#6B4FBB 16%,var(--card));color:#7C5CD6}
.live{display:inline-flex;align-items:center;gap:6px;font:700 .72rem var(--font-body);letter-spacing:.05em;text-transform:uppercase;color:#D64545;margin-bottom:2px}
.live::before{content:"";width:8px;height:8px;border-radius:50%;background:#D64545;animation:mp-pulse 1.4s ease-in-out infinite}
/* violet: the "Advanced" level colour and the third series colour in diagrams */
:root{--violet:#6B4FBB;--violet-soft:#ECE6FA}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--violet:#A58BF0;--violet-soft:#2A2342}}
:root[data-theme="dark"]{--violet:#A58BF0;--violet-soft:#2A2342}
.s-violet{fill:var(--violet)}.s-soft-violet{fill:var(--violet-soft)}
.lvl--a,.prob__tag--advanced{background:var(--violet-soft);color:var(--violet)}
.levels .modlab__bar button[data-mod="a"].on{background:var(--violet);border-color:var(--violet)}