/* ===== SNAKE Academy — article template ===== */
:root{--bg:#050505;--panel:rgba(16,18,16,0.85);--panel-2:rgba(255,255,255,0.03);--text:#fff;--muted:#c2cabc;--faint:#7e8a81;--gold:#d4af37;--gold-light:#f3d76d;--green:#39ff64;--green-2:#22c55e;--red:#ff6b6b;--blue:#5bb0ff;--border:rgba(212,175,55,0.18);--line:rgba(255,255,255,0.08);--shadow:0 18px 48px rgba(0,0,0,0.25);--mono:'JetBrains Mono',monospace}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{min-height:100vh;color:var(--text);font-family:"DM Sans",Arial,sans-serif;line-height:1.65;background:radial-gradient(ellipse 80% 40% at 50% -6%,rgba(212,175,55,0.08),transparent 60%),linear-gradient(180deg,#050505 0%,#080a08 60%,#050505 100%);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 22px}
h1,h2,h3{font-family:'Syne',sans-serif;font-weight:800;line-height:1.15;letter-spacing:-0.4px}
.gold{background:linear-gradient(135deg,var(--gold-light),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.reading-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),var(--green));z-index:2200;transition:width .1s linear}
.reading-status{position:fixed;right:14px;top:74px;z-index:18;padding:6px 10px;border:1px solid var(--border);border-radius:99px;background:rgba(8,10,8,.88);backdrop-filter:blur(10px);color:var(--gold-light);font:700 10.5px/1.2 var(--mono);pointer-events:none;transition:opacity .2s ease,border-color .2s ease}
.reading-status.is-done{border-color:rgba(34,197,94,.42);color:var(--green-2)}
.nav{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--border);background:rgba(5,5,5,0.86);backdrop-filter:blur(18px)}
.nav-inner{max-width:1080px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand img{height:32px;width:auto;display:block}
.nav-actions{display:flex;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:12px;font-weight:700;font-size:14px;cursor:pointer;border:none;transition:.25s;white-space:nowrap;font-family:inherit}
.btn-primary{background:linear-gradient(135deg,var(--gold),#c9a227);color:#050505}
.btn-primary:hover{transform:translateY(-2px)}
.btn-secondary{background:transparent;color:var(--gold);border:1.5px solid var(--gold)}
.btn-secondary:hover{background:var(--gold);color:#050505}
.art-head{padding:34px 0 10px}
.breadcrumb{font-family:var(--mono);font-size:12px;color:var(--faint);margin-bottom:20px}
.breadcrumb a:hover{color:var(--gold-light)}
.art-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:16px}
.chip{font-family:var(--mono);font-size:11px;letter-spacing:1px;text-transform:uppercase;padding:5px 11px;border-radius:99px;border:1px solid var(--border);background:rgba(212,175,55,0.08);color:var(--gold-light)}
.chip.diff{border-color:rgba(91,176,255,0.3);background:rgba(91,176,255,0.08);color:var(--blue)}
.chip.adv{border-color:rgba(255,107,107,0.3);background:rgba(255,107,107,0.08);color:#ff9a9a}
.art-meta .time{font-family:var(--mono);font-size:12px;color:var(--faint)}
.article-save{display:inline-flex;align-items:center;min-height:36px;padding:6px 11px;border:1px solid var(--line);border-radius:99px;background:rgba(255,255,255,.025);color:var(--muted);font:700 11px/1.2 var(--mono);cursor:pointer}
.article-save[aria-pressed=true]{border-color:rgba(212,175,55,.44);background:rgba(212,175,55,.09);color:var(--gold-light)}
.art-head h1{font-size:clamp(30px,5.2vw,52px);margin-bottom:16px}
.deck{font-size:clamp(17px,2.4vw,21px);color:var(--muted);line-height:1.6;max-width:760px}
.lesson-of{margin-top:18px;display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;color:var(--faint);border:1px solid var(--line);border-radius:99px;padding:7px 14px}
.lesson-of b{color:var(--gold-light)}
.art-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:44px;align-items:start;padding:26px 0 10px}
.toc{position:sticky;top:96px}
.toc-title{font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--faint);margin-bottom:12px}
.toc a{display:block;padding:7px 0 7px 14px;border-left:2px solid var(--line);color:var(--faint);font-size:13.5px;transition:.2s}
.toc a:hover{color:var(--muted)}
.toc a.active{border-left-color:var(--gold);color:var(--gold-light)}
.toc-pill{display:none}
.art-body{max-width:720px}
.art-body h2{font-size:clamp(23px,3.4vw,32px);margin:38px 0 14px;scroll-margin-top:96px}
.art-body h3{font-size:19px;margin:26px 0 10px}
.art-body p{font-size:17.5px;line-height:1.72;color:#d8ded4;margin-bottom:18px}
.art-body strong{color:#fff}
.art-body ul,.art-body ol{margin:0 0 18px 22px;color:#d8ded4;font-size:17px}
.art-body li{margin-bottom:9px;line-height:1.6}
.art-body a.inline{color:var(--gold-light);border-bottom:1px solid rgba(212,175,55,0.35)}
.lead-drop::first-letter{font-family:'Syne',sans-serif;font-weight:800;font-size:58px;line-height:.8;float:left;margin:6px 12px 0 0;background:linear-gradient(135deg,var(--gold-light),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.callout{border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:12px;background:rgba(255,255,255,0.025);padding:16px 18px;margin:22px 0}
.callout .co-label{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700;margin-bottom:8px}
.callout p{font-size:15.5px;line-height:1.62;color:var(--muted);margin:0}
.callout p+p{margin-top:8px}
.co-remember{border-left-color:var(--gold)}.co-remember .co-label{color:var(--gold-light)}
.co-gem{border-left-color:#c084fc;background:linear-gradient(135deg,rgba(192,132,252,0.08),transparent 60%)}.co-gem .co-label{color:#c9a2ff}
.co-mistake{border-left-color:var(--red)}.co-mistake .co-label{color:#ff9a9a}
.co-warning{border-left-color:#ffb020}.co-warning .co-label{color:#ffc862}
.co-example{border-left-color:var(--blue)}.co-example .co-label{color:var(--blue)}
.co-check{border-left-color:var(--green-2)}.co-check .co-label{color:var(--green-2)}
.co-check ul{margin:6px 0 0 2px;list-style:none}
.co-check li{font-size:15px;color:var(--muted);padding-left:26px;position:relative;margin-bottom:8px;line-height:1.5}
.co-check li::before{content:"✓";position:absolute;left:0;color:var(--green-2);font-weight:700}
.figure{margin:26px 0;border:1px dashed rgba(212,175,55,0.35);border-radius:16px;background:repeating-linear-gradient(135deg,rgba(212,175,55,0.03),rgba(212,175,55,0.03) 10px,transparent 10px,transparent 20px)}
.figure-inner{padding:22px}
.figure .fig-tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:10.5px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gold-light);background:rgba(212,175,55,0.1);border:1px solid var(--border);border-radius:99px;padding:4px 11px;margin-bottom:12px}
.figure h4{font-family:'Syne',sans-serif;font-size:16px;margin-bottom:8px;color:#fff}
.figure p{font-size:14px;color:var(--muted);line-height:1.6;margin:0}
.figure .fig-file{margin-top:10px;font-family:var(--mono);font-size:11.5px;color:var(--faint)}
.figure figcaption{padding:0 22px 18px;font-size:13px;color:var(--faint);font-style:italic}
.takeaways{margin:34px 0;padding:24px;border:1px solid var(--border);border-radius:18px;background:linear-gradient(160deg,rgba(212,175,55,0.06),transparent 60%),rgba(255,255,255,0.02)}
.takeaways h3{font-size:18px;margin-bottom:14px}
.takeaways ul{list-style:none;margin:0}
.takeaways li{font-size:15.5px;color:var(--muted);padding-left:26px;position:relative;margin-bottom:11px;line-height:1.55}
.takeaways li::before{content:"→";position:absolute;left:0;color:var(--gold)}
.share{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:30px 0;padding-top:22px;border-top:1px solid var(--line)}
.share span{font-family:var(--mono);font-size:12px;color:var(--faint)}
.share button,.share a{display:inline-flex;align-items:center;gap:7px;padding:9px 14px;border-radius:10px;border:1px solid var(--line);background:rgba(255,255,255,0.03);color:var(--muted);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer}
.share button:hover,.share a:hover{border-color:var(--gold);color:var(--gold-light)}
.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}
.lesson-nav a{padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,0.02);transition:.2s}
.lesson-nav a:hover{border-color:var(--border);transform:translateY(-2px)}
.lesson-nav .ln-dir{font-family:var(--mono);font-size:11px;color:var(--faint);text-transform:uppercase;letter-spacing:1px}
.lesson-nav .ln-t{display:block;margin-top:5px;font-family:'Syne',sans-serif;font-weight:700;font-size:15px;color:#fff}
.lesson-nav .next{text-align:right}
.lesson-nav .disabled{opacity:.4;pointer-events:none}
.related-h{font-size:22px;margin:8px 0 16px}
.rel-scroll{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:8px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.rel-scroll::-webkit-scrollbar{display:none}
.rel-card{flex:0 0 78%;max-width:300px;scroll-snap-align:start;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,0.02);padding:18px;transition:.2s}
.rel-card:hover{border-color:var(--border);transform:translateY(-3px)}
.rel-card .rc-cat{font-family:var(--mono);font-size:10.5px;letter-spacing:1px;text-transform:uppercase;color:var(--gold-light)}
.rel-card h4{font-family:'Syne',sans-serif;font-size:16px;margin:8px 0 6px;color:#fff}
.rel-card p{font-size:13px;color:var(--faint);line-height:1.5}
.rel-card .rc-go{display:inline-block;margin-top:10px;font-family:var(--mono);font-size:12px;color:var(--gold-light)}
.cta-band{margin:34px 0 8px;padding:32px;border:1px solid var(--border);border-radius:22px;background:linear-gradient(135deg,rgba(212,175,55,0.08),transparent 55%),var(--panel-2);text-align:center}
.cta-band h2{font-size:clamp(21px,3vw,30px);margin-bottom:10px}
.cta-band p{color:var(--muted);max-width:540px;margin:0 auto 20px}
.cta-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.footer{border-top:1px solid var(--border);padding:28px 22px;text-align:center;color:var(--faint);font-size:13px;line-height:1.6;margin-top:20px}
.footer a{color:var(--gold-light)}
.glossary{max-width:820px;margin:0 auto}
.gloss-item{padding:16px 0;border-bottom:1px solid var(--line)}
.gloss-item dt{font-family:'Syne',sans-serif;font-weight:700;font-size:18px;color:#fff;margin-bottom:5px}
.gloss-item dt small{font-family:var(--mono);font-size:11px;color:var(--gold-light);margin-left:8px;letter-spacing:.5px}
.gloss-item dd{font-size:15.5px;color:var(--muted);line-height:1.6}
.snake-bottomnav{position:fixed;left:0;right:0;bottom:0;z-index:1500;display:none;grid-template-columns:repeat(5,1fr);align-items:stretch;background:rgba(8,9,8,0.94);backdrop-filter:blur(20px);border-top:1px solid rgba(212,175,55,0.18);padding-bottom:env(safe-area-inset-bottom);transition:transform .28s cubic-bezier(.4,0,.2,1)}
.snake-bottomnav.sbn-hidden{transform:translateY(120%)}
.sbn-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:8px 4px 7px;min-height:54px;color:#8a938c;font-size:10.5px;font-weight:600;text-decoration:none;-webkit-tap-highlight-color:transparent}
.sbn-item svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.sbn-item.active{color:#f3d76d}
.sbn-item:active{transform:scale(.92)}
@media(max-width:900px){
    .art-layout{grid-template-columns:1fr;gap:0}
    .toc{position:static;margin-bottom:8px}
    .toc-desktop{display:none}
    .toc-pill{display:block;position:sticky;top:64px;z-index:15;margin:0 0 18px}
    .toc-pill summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;padding:13px 16px;border:1px solid var(--border);border-radius:12px;background:rgba(10,12,10,0.94);backdrop-filter:blur(12px);font-family:var(--mono);font-size:12.5px;color:var(--gold-light)}
    .toc-pill summary::-webkit-details-marker{display:none}
    .toc-pill[open] summary{border-radius:12px 12px 0 0}
    .toc-pill .toc-pill-body{border:1px solid var(--border);border-top:none;border-radius:0 0 12px 12px;background:rgba(10,12,10,0.98);padding:6px 14px 12px}
    .toc-pill .toc-pill-body a{display:block;padding:9px 0;color:var(--muted);font-size:14px;border-bottom:1px solid var(--line)}
    .toc-pill .toc-pill-body a:last-child{border-bottom:none}
    .snake-bottomnav{display:grid}
    body{padding-bottom:calc(58px + env(safe-area-inset-bottom))}
    .lesson-nav{grid-template-columns:1fr}
    .rel-card{flex:0 0 82%}
    .reading-status{top:auto;right:12px;bottom:calc(66px + env(safe-area-inset-bottom));font-size:10px}
}
@media(prefers-reduced-motion:reduce){.reading-progress,.reading-status{transition:none}.snake-bottomnav{transition:none}}
/* quiz */
.quiz{margin:36px 0;padding:26px;border:1px solid var(--border);border-radius:20px;background:linear-gradient(160deg,rgba(212,175,55,0.05),transparent 60%),rgba(255,255,255,0.02)}
.quiz-head{margin-bottom:18px}
.quiz-tag{font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gold-light)}
.quiz-head h2{font-size:24px;margin:6px 0}
.quiz-head p{color:var(--muted);font-size:14.5px}
.quiz-q{margin-bottom:22px}
.quiz-q:last-of-type{margin-bottom:16px}
.q-text{font-family:'Syne',sans-serif;font-weight:700;font-size:16.5px;color:#fff;margin-bottom:12px;line-height:1.35}
.q-opt{display:block;width:100%;text-align:left;margin-bottom:8px;padding:13px 15px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,0.03);color:var(--muted);font-family:inherit;font-size:15px;cursor:pointer;transition:border-color .18s ease,background .18s ease,color .18s ease}
.q-opt:hover{border-color:rgba(212,175,55,0.35);color:#fff}
.quiz-q.done .q-opt{cursor:default}
.q-opt.correct{border-color:var(--green-2);background:rgba(34,197,94,0.12);color:#dfffe8}
.q-opt.correct::after{content:" ✓";font-weight:700}
.q-opt.wrong{border-color:var(--red);background:rgba(239,68,68,0.1);color:#ffd9d9}
.q-opt.wrong::after{content:" ✕"}
.q-explain{max-height:0;overflow:hidden;opacity:0;transition:max-height .3s ease,opacity .3s ease,margin .3s ease;font-size:14px;color:var(--muted);line-height:1.55;border-left:2px solid var(--gold);padding-left:12px}
.q-explain.show{max-height:320px;opacity:1;margin-top:10px}
.quiz-result{padding:16px 18px;border:1px solid var(--border);border-radius:14px;background:rgba(212,175,55,0.06);font-size:15.5px;color:#fff;text-align:center}
.quiz-result b{color:var(--gold-light)}
.quiz-result .qr-msg{display:block;margin-top:4px;font-size:14px;color:var(--muted)}
/* placeholder immagini nascosti finché non arrivano le immagini vere (che non avranno .fig-tag) */
.figure:has(.fig-tag){display:none}