/* ============================================================
   AstraCode · style.css
============================================================ */
:root{
  --bg0:#070d1a; --panel:#101c33; --panel2:#0d1729;
  --line:rgba(146,170,212,.15); --line2:rgba(146,170,212,.3);
  --text:#e9eef9; --mut:#94a5c4; --dim:#5f7396;
  --gold:#ffc861; --gold2:#ffab2e; --teal:#4fd8c4; --blue:#7fb2ff; --coral:#ff7a6b;
  --disp:'Space Grotesk',sans-serif; --body:'IBM Plex Sans',sans-serif; --mono:'JetBrains Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{background:var(--bg0);color:var(--text);font-family:var(--body);font-size:16px;line-height:1.6;overflow-x:hidden}
::selection{background:var(--gold);color:#131313}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
h1,h2,h3,h4{font-family:var(--disp);line-height:1.15;letter-spacing:-.01em}
.mono{font-family:var(--mono)}
.dim{color:var(--dim)}

/* ---------- ambient background ---------- */
#stars{position:fixed;inset:0;z-index:0;pointer-events:none}
#stars i{position:absolute;border-radius:50%;background:#fff;animation:twk var(--d,4s) ease-in-out var(--dl,0s) infinite}
#stars i.g{background:var(--gold)} #stars i.t{background:var(--teal)}
@keyframes twk{0%,100%{opacity:.12;transform:scale(.7)}50%{opacity:.9;transform:scale(1)}}
.comet{position:fixed;top:-8%;left:-8%;width:130px;height:2px;z-index:0;pointer-events:none;opacity:0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.85));border-radius:2px;
  transform:rotate(38deg);animation:comet 12s linear infinite}
@keyframes comet{0%{transform:translate(0,0) rotate(38deg);opacity:0}3%{opacity:1}10%{transform:translate(120vw,90vh) rotate(38deg);opacity:0}100%{opacity:0}}
body::before{content:'';position:fixed;inset:0;z-index:0;pointer-events:none;background:
  radial-gradient(700px 500px at 12% -5%,rgba(255,184,64,.10),transparent 60%),
  radial-gradient(800px 600px at 105% 90%,rgba(64,200,180,.09),transparent 60%),
  radial-gradient(600px 500px at 85% 8%,rgba(96,150,255,.07),transparent 60%)}
header,main,footer{position:relative;z-index:1}

/* ---------- header ---------- */
.hd{position:sticky;top:0;z-index:60;background:rgba(7,12,24,.8);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.hd-in{max-width:1220px;margin:0 auto;display:flex;align-items:center;gap:20px;padding:13px 26px}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand svg{animation:pulse 5s ease-in-out infinite;display:block}
@keyframes pulse{0%,100%{transform:scale(1) rotate(0)}50%{transform:scale(1.14) rotate(18deg)}}
.wm{font:700 1.2rem var(--disp);letter-spacing:-.02em}
.wm b{color:var(--gold)}
.brand.sm .wm{font-size:1.02rem}
.nav{display:flex;gap:4px}
.nav a{position:relative;padding:8px 12px;font-size:.92rem;font-weight:600;color:var(--mut);transition:.2s}
.nav a::after{content:'';position:absolute;left:12px;right:12px;bottom:4px;height:2px;background:var(--gold);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .25s}
.nav a:hover{color:var(--text)} .nav a:hover::after{transform:scaleX(1)}
.search{flex:1;max-width:330px;display:flex;align-items:center;gap:9px;background:#0d1830;border:1px solid var(--line);border-radius:10px;padding:8px 13px;color:var(--dim);transition:.2s}
.search:focus-within{border-color:var(--gold);box-shadow:0 0 0 3px rgba(255,200,97,.14);color:var(--gold)}
.search input{flex:1;background:none;border:0;outline:0;color:var(--text);font:400 .88rem var(--body);min-width:0}
.search input::placeholder{color:var(--dim)}
.spacer{flex:1}
.back{display:flex;align-items:center;gap:8px;color:var(--mut);font-size:.82rem;font-weight:700;letter-spacing:.06em;padding:8px 13px;border:1px solid var(--line);border-radius:10px;transition:.2s}
.back .arr{transition:transform .2s;font-size:1rem}
.back:hover{color:var(--gold);border-color:var(--gold)} .back:hover .arr{transform:translateX(-3px)}
.auth{display:flex;align-items:center;gap:10px;flex:none}
.acct{position:relative}
.avatar{width:38px;height:38px;border-radius:50%;border:0;display:grid;place-items:center;font:700 .8rem var(--mono);color:#1a1204;background:linear-gradient(135deg,var(--gold),var(--teal));transition:.2s;box-shadow:0 4px 14px -4px rgba(255,200,97,.5)}
.avatar:hover{transform:scale(1.08)}
.avatar.big{width:56px;height:56px;font-size:1.05rem}
.drop{position:absolute;right:0;top:calc(100% + 12px);min-width:228px;background:#0f1b31;border:1px solid var(--line2);border-radius:13px;padding:8px;box-shadow:0 24px 50px -18px rgba(0,0,0,.75);opacity:0;transform:translateY(-8px) scale(.98);transform-origin:top right;pointer-events:none;transition:.22s;z-index:70}
.drop.open{opacity:1;transform:none;pointer-events:auto}
.drop-h{padding:10px 12px 12px;border-bottom:1px solid var(--line);margin-bottom:6px}
.drop-h b{display:block;font-family:var(--disp)} .drop-h span{font:400 .72rem var(--mono);color:var(--dim)}
.drop button{display:flex;width:100%;align-items:center;background:none;border:0;color:var(--text);font:500 .9rem var(--body);padding:10px 12px;border-radius:9px;transition:.15s;text-align:left}
.drop button:hover{background:#182642;transform:translateX(2px)}
.drop hr{border:0;border-top:1px solid var(--line);margin:6px 4px}
.drop .out{color:var(--coral)}

/* ---------- buttons & chips ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;border-radius:10px;font:600 .95rem var(--body);padding:11px 20px;transition:.22s;letter-spacing:.01em}
.btn.gold{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1a1204;box-shadow:0 6px 18px -8px rgba(255,180,60,.55)}
.btn.gold:hover{transform:translateY(-2px);box-shadow:0 12px 26px -8px rgba(255,180,60,.65)}
.btn.ghost{background:transparent;border-color:var(--line2);color:var(--text)}
.btn.ghost:hover{border-color:var(--gold);color:var(--gold);transform:translateY(-2px)}
.btn.brand{background:linear-gradient(135deg,var(--bc),var(--bc2));color:#0b1120}
.btn.sm{padding:8px 14px;font-size:.85rem;border-radius:8px}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important}
.chip{display:inline-block;font:600 .64rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--mut);border:1px solid var(--line2);border-radius:99px;padding:3px 9px}
.chip.acc{color:var(--ac);border-color:color-mix(in srgb,var(--ac) 55%,transparent)}
.chip.gold{color:var(--gold);border-color:rgba(255,200,97,.5)}
.lv-beginner{color:var(--teal)!important;border-color:rgba(79,216,196,.45)!important}
.lv-intermediate{color:var(--gold)!important;border-color:rgba(255,200,97,.45)!important}
.lv-advanced{color:var(--coral)!important;border-color:rgba(255,122,107,.45)!important}

/* ---------- badges (loghi ufficiali) ---------- */
.badge{--g1:#888;--g2:#555;width:52px;height:52px;flex:none;display:grid;place-items:center;border-radius:13px;font:700 1rem var(--mono);color:#fff;background:linear-gradient(135deg,var(--g1),var(--g2));box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 6px 16px -8px rgba(0,0,0,.6);letter-spacing:-.02em}
.badge.dk{color:#10131c}
.badge.sm{width:26px;height:26px;font-size:.6rem;border-radius:8px}
.badge.lg{width:76px;height:76px;font-size:1.5rem;border-radius:18px}
.badge img{width:68%;height:68%;object-fit:contain;position:relative;z-index:1;filter:drop-shadow(0 3px 6px rgba(0,0,0,.45))}
.badge.sm img{width:76%;height:76%}
.badge .fb-mono{display:none}
.badge.noimg .fb-mono{display:block}

/* ---------- progress bar ---------- */
.bar{display:block;height:9px;background:#152238;border-radius:99px;overflow:hidden;position:relative}
.bar i{display:block;height:100%;width:var(--w,0%);border-radius:99px;position:relative;background:linear-gradient(90deg,var(--bc,var(--teal)),var(--gold));transition:width 1.1s cubic-bezier(.2,.7,.2,1)}
.bar i::after{content:'';position:absolute;inset:0;border-radius:99px;background:linear-gradient(110deg,transparent 30%,rgba(255,255,255,.35) 50%,transparent 70%);background-size:220% 100%;animation:shine 2.6s linear infinite}
@keyframes shine{to{background-position:-220% 0}}

/* ---------- hero ---------- */
.hero{max-width:1220px;margin:0 auto;padding:60px 26px 30px;display:grid;grid-template-columns:1.12fr .88fr;gap:54px;align-items:center;min-height:60vh}
.eyebrow{font:700 .7rem var(--mono);letter-spacing:.24em;color:var(--gold);text-transform:uppercase}
.hero h1{font-size:clamp(2.2rem,4.6vw,3.5rem);margin:16px 0 10px;font-weight:700}
.hero h1 em{font-style:normal;color:var(--gold)}
.lead{color:var(--mut);max-width:52ch}
.rot-wrap{min-height:1.8em;margin-bottom:26px}
#rotPhrase{color:var(--mut);font-size:1.05rem;transition:opacity .35s}
#rotPhrase::before{content:'// ';color:var(--teal);font-family:var(--mono)}
.cont{display:flex;align-items:center;gap:20px;padding:22px 24px;border-radius:16px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-left:4px solid var(--bc);transition:.25s;max-width:580px}
.cont:hover{transform:translateY(-3px);box-shadow:0 18px 40px -18px color-mix(in srgb,var(--bc) 55%,transparent)}
.cont-info{flex:1;display:flex;flex-direction:column;gap:7px}
.cont-k{font-size:.62rem;letter-spacing:.2em;color:var(--dim)}
.cont-info b{font:700 1.3rem var(--disp)}
.cont-pct{font-size:.7rem;color:var(--mut)}
.h-right{display:flex;flex-direction:column;gap:16px}
.tile{padding:24px 28px;border-radius:16px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);transition:.25s}
.tile:hover{border-color:var(--line2);transform:translateY(-3px)}
.tile .num{display:block;font:700 3rem/1 var(--disp);letter-spacing:-.02em}
.tile .t-l{display:block;margin-top:8px;font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}
.tile:nth-child(1) .num{color:var(--gold)} .tile:nth-child(2) .num{color:var(--teal)} .tile:nth-child(3) .num{color:var(--blue)}

/* ---------- auth card ---------- */
.authcard{margin-top:26px;max-width:440px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:16px;padding:24px}
.tabs{position:relative;display:grid;grid-template-columns:1fr 1fr;background:#0c1729;border:1px solid var(--line);border-radius:11px;padding:4px;margin-bottom:18px}
.tab{position:relative;z-index:1;text-align:center;padding:9px 0;font:600 .9rem var(--body);color:var(--mut);cursor:pointer;transition:color .2s;user-select:none}
.tab.on{color:#1a1204}
.tab-i{position:absolute;top:4px;bottom:4px;left:4px;width:calc(50% - 4px);background:linear-gradient(135deg,var(--gold),var(--gold2));border-radius:8px;transition:transform .28s cubic-bezier(.4,0,.2,1)}
.aform{display:flex;flex-direction:column;gap:8px}
.fl{font-size:.62rem;letter-spacing:.18em;color:var(--dim);margin-top:8px}
.aform input{background:#0c1729;border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--text);font:400 .92rem var(--body);outline:0;transition:.2s}
.aform input:focus{border-color:var(--gold);box-shadow:0 0 0 3px rgba(255,200,97,.13)}
.btn.full{width:100%;justify-content:center;margin-top:16px}
.or{display:flex;align-items:center;gap:12px;margin:18px 0 12px;color:var(--dim);font:400 .72rem var(--mono)}
.or::before,.or::after{content:'';flex:1;height:1px;background:var(--line)}
.soc{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.soc .btn{justify-content:center}

/* ---------- ticker ---------- */
.ticker{overflow:hidden;border-block:1px solid var(--line);background:rgba(12,21,38,.55);margin-top:26px}
.tk-in{display:flex;align-items:center;gap:38px;width:max-content;padding:13px 0;animation:tick 34s linear infinite}
.ticker:hover .tk-in{animation-play-state:paused}
@keyframes tick{to{transform:translateX(-50%)}}
.tk{display:flex;align-items:center;gap:9px;font:500 .78rem var(--mono);color:var(--mut);letter-spacing:.06em;white-space:nowrap}

/* ---------- sections & grids ---------- */
.sec{max-width:1220px;margin:0 auto;padding:74px 26px 8px}
.sec.slim{padding-top:44px}
.sec-h{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap}
.sec-h h2{font-size:clamp(1.6rem,3vw,2.3rem);margin-top:10px}
.sub{color:var(--mut);margin-top:6px;max-width:62ch}
.more{color:var(--gold);font-size:.78rem;letter-spacing:.1em;white-space:nowrap;padding-bottom:6px}
.more span{display:inline-block;transition:transform .2s}
.more:hover span{transform:translateX(5px)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(238px,1fr));gap:18px;margin-top:28px}
.grid.courses{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.grid.projects{grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}

/* ---------- cards ---------- */
.card{position:relative;display:flex;flex-direction:column;gap:10px;padding:20px;border-radius:14px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);border-color:color-mix(in srgb,var(--bc,#888) 55%,transparent);box-shadow:0 16px 34px -16px color-mix(in srgb,var(--bc,#000) 45%,transparent)}
.card .top{display:flex;align-items:center;gap:12px}
.card .tt{display:flex;flex-direction:column;gap:5px}
.card h3{font-size:1.12rem}
.card p{font-size:.86rem;color:var(--mut);flex:1}
.card .meta{display:flex;justify-content:space-between;align-items:center;gap:10px;font:500 .7rem var(--mono);color:var(--dim);letter-spacing:.04em}
.soon{margin-left:auto;font-size:.6rem;color:var(--gold);border:1px dashed rgba(255,200,97,.5);padding:2px 8px;border-radius:99px;letter-spacing:.1em}
.stack{display:flex;padding-left:8px}
.stack .badge.sm{margin-left:-8px;box-shadow:0 0 0 2px var(--panel2)}
.go{color:var(--gold);display:inline-block;transition:transform .2s}
.card:hover .go{transform:translateX(4px)}
.exrow{flex-direction:row;align-items:center;gap:14px;padding:16px 20px;cursor:pointer}
.excard-t{flex:1;display:flex;flex-direction:column;gap:3px}
.excard-t b{font:600 1rem var(--body)}
.excard-t .dim{font-size:.66rem;letter-spacing:.06em}
.arr{color:var(--gold);transition:transform .2s}
.exrow:hover .arr{transform:translateX(4px)}

/* ---------- plans ---------- */
.runner{margin-top:26px;padding:15px 20px;border:1px dashed rgba(255,200,97,.45);border-radius:12px;color:var(--gold);font-size:.76rem;letter-spacing:.12em;background:rgba(255,200,97,.05)}
.cur{animation:blink 1.1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:18px;margin-top:22px}
.plan{position:relative;display:flex;flex-direction:column;gap:14px;padding:26px 24px;border-radius:16px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);transition:.25s}
.plan:hover{transform:translateY(-4px)}
.plan.hot{border-color:rgba(255,200,97,.55);box-shadow:0 22px 50px -22px rgba(255,180,60,.35)}
.plan .tag{position:absolute;top:-11px;right:18px;background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1a1204;font:700 .6rem var(--mono);letter-spacing:.14em;padding:5px 10px;border-radius:99px}
.plan h3{font-size:1.25rem}
.plan .price{font:700 2.4rem var(--disp)} .plan .price small{font:400 .8rem var(--body);color:var(--dim)}
.plan ul{list-style:none;display:flex;flex-direction:column;gap:9px;flex:1}
.plan li{font-size:.87rem;color:var(--mut);padding-left:22px;position:relative}
.plan li::before{content:'✓';position:absolute;left:0;color:var(--teal);font-weight:700}
.plan li.no{opacity:.45} .plan li.no::before{content:'—';color:var(--dim)}

/* ---------- footer ---------- */
footer{margin-top:90px;border-top:1px solid var(--line);background:rgba(9,15,28,.6)}
.ft{max-width:1220px;margin:0 auto;padding:34px 26px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.ft nav{display:flex;gap:18px}
.ft nav a{color:var(--mut);font-size:.88rem;transition:.2s} .ft nav a:hover{color:var(--gold)}
.ft .dim{font-size:.72rem}
.ft p{font-size:.72rem;color:var(--dim);margin-top:6px}

/* ---------- list pages ---------- */
.page{max-width:1220px;margin:0 auto;padding:48px 26px 30px}
.page-h h1{font-size:clamp(1.9rem,3.6vw,2.8rem);margin:12px 0 8px}
.page-h p{color:var(--mut);max-width:64ch}
.toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:30px 0 6px}
.search.big{max-width:420px;flex:1;display:flex}
.sel{background:#0d1830;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 14px;font:500 .8rem var(--mono);outline:0;cursor:pointer;transition:.2s}
.sel:hover,.sel:focus{border-color:var(--gold)}
#count,#projCount{font-size:.7rem;color:var(--dim);letter-spacing:.08em}
.fpanel{margin:28px 0 4px;padding:18px 20px;border:1px solid var(--line);border-radius:14px;background:rgba(13,22,40,.5)}
.fpanel-t{font-size:.64rem;letter-spacing:.2em;color:var(--gold)}
.fchips{display:flex;flex-wrap:wrap;gap:9px;margin:12px 0 8px}
.fchip{display:flex;align-items:center;gap:7px;padding:7px 13px;border:1px solid var(--line2);border-radius:99px;cursor:pointer;font-size:.78rem;color:var(--mut);transition:.18s;user-select:none}
.fchip input{display:none}
.fchip:hover{border-color:var(--bc);color:var(--text)}
.fchip:has(input:checked){background:color-mix(in srgb,var(--bc) 18%,transparent);border-color:var(--bc);color:var(--text)}
.fchip:has(input:checked)::before{content:'✓';color:var(--bc);font-weight:700}
#projHint{font-size:.68rem;color:var(--dim)}
.empty{grid-column:1/-1;text-align:center;padding:50px 20px;color:var(--dim);border:1px dashed var(--line2);border-radius:14px;font-size:.85rem}

/* ---------- language page ---------- */
.lang-hero{max-width:1220px;margin:0 auto;padding:52px 26px 0}
.lh-top{display:flex;gap:24px;align-items:flex-start}
.lh-top h1{font-size:clamp(2rem,4vw,3rem);margin:8px 0}
.lh-top p{color:var(--mut);max-width:62ch}
.lh-prog{margin-top:30px;max-width:660px}
.lh-row{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:12px;flex-wrap:wrap}
.chaps{display:flex;flex-direction:column;gap:10px;margin-top:26px;max-width:840px}
.chrow{display:flex;align-items:center;gap:18px;padding:16px 20px;border-radius:12px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-left:3px solid var(--line2);transition:.22s;width:100%;text-align:left;font:inherit;color:inherit}
a.chrow:hover,button.chrow:hover{transform:translateX(6px);border-left-color:var(--bc);border-color:color-mix(in srgb,var(--bc) 45%,var(--line))}
.chrow .n{color:var(--dim);font-size:.78rem}
.chrow .ct{flex:1;font-weight:600}
.chrow .cs{font-size:.68rem;letter-spacing:.1em;color:var(--gold)}
.chrow.done{border-left-color:var(--teal)} .chrow.done .cs{color:var(--teal)}
.chrow.soon{opacity:.5} .chrow.soon .cs{color:var(--dim)}
.why p{color:var(--mut);max-width:72ch;margin-top:12px}
.why b{color:var(--text)}

/* ---------- lesson page ---------- */
.lesson{max-width:1180px;margin:34px auto 60px;padding:0 26px;display:grid;grid-template-columns:262px 1fr;gap:44px;align-items:start}
.side{position:sticky;top:86px}
.side-card{background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:14px;padding:18px}
.side-top{display:flex;align-items:center;gap:10px;font:700 .66rem var(--mono);letter-spacing:.12em;color:var(--mut);margin-bottom:14px}
.side-pct{font-size:.64rem;color:var(--dim);margin:8px 0 14px;letter-spacing:.1em}
.chap{display:flex;flex-direction:column;gap:4px;max-height:56vh;overflow:auto}
.ch{display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:9px;font-size:.83rem;color:var(--mut);border-left:3px solid transparent;transition:.18s}
.ch .n{font:700 .66rem var(--mono);color:var(--dim)}
.ch .t{flex:1}
.ch .s{font-size:.72rem;color:var(--dim)}
.ch:hover{background:#152238;color:var(--text)}
.ch.cur{background:#16233c;border-left-color:var(--gold);color:var(--text)} .ch.cur .s{color:var(--gold)}
.ch.done .s{color:var(--teal)}
.ch.soon{opacity:.42;cursor:not-allowed}
.prose{max-width:74ch}
.prose h1{font-size:clamp(1.9rem,3.4vw,2.7rem);margin:12px 0 14px}
.prose .lead{margin-bottom:10px}
.prose h2{font-size:1.5rem;margin:44px 0 12px}
.prose h2::before{content:'// ';color:var(--gold);font-family:var(--mono);font-size:1.1rem}
.prose p{color:#c7d3e9;margin:12px 0}
.prose ul,.prose ol{color:#c7d3e9;margin:12px 0 12px 22px;display:flex;flex-direction:column;gap:7px}
.prose code{font:500 .84em var(--mono);background:#16233c;color:#ffd88a;padding:2px 7px;border-radius:6px}
.prose pre{background:#0a1122;border:1px solid var(--line);border-left:3px solid var(--bc,var(--gold));border-radius:12px;padding:18px 20px;overflow-x:auto;margin:18px 0}
.prose pre code{background:none;padding:0;color:#dbe6f7;font-size:.88rem;line-height:1.65}
.k{color:#ffc861}.s{color:#7ee0c8}.c{color:#5f7396;font-style:italic}.f{color:#7fb2ff}.n{color:#ff9d7a}.b{color:#62d9e8}
.note{border-left:3px solid var(--teal);background:rgba(79,216,196,.06);border-radius:0 10px 10px 0;padding:14px 18px;margin:20px 0;color:#bcd9d3;font-size:.9rem}
.note b{color:var(--teal);font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;display:block;margin-bottom:4px}

/* ---------- exercises in lessons ---------- */
.ex{margin:30px 0;border:1px dashed rgba(255,200,97,.4);border-radius:14px;background:rgba(255,200,97,.045);padding:22px 24px}
.ex-h{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.ex-tag{font:700 .66rem var(--mono);letter-spacing:.2em;color:var(--gold)}
.ex-q{color:var(--text)!important;font-size:1rem}
.opts{display:flex;flex-direction:column;gap:9px;margin-top:14px}
.opt{display:block;text-align:left;background:#0e1a30;border:1px solid var(--line);border-radius:10px;padding:12px 16px;color:var(--text);font-size:.88rem;transition:.18s}
.opt:hover{border-color:var(--gold);transform:translateX(5px)}
.ex.done .opt{cursor:default;transform:none!important}
.opt.ok{border-color:var(--teal);background:rgba(79,216,196,.09)} .opt.ok::after{content:'  ✓';color:var(--teal)}
.opt.bad{border-color:var(--coral);background:rgba(255,122,107,.08);animation:shake .4s}
@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}
.fill-row{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.fill-row input{flex:1;min-width:230px;background:#0c1729;border:1px solid var(--line);border-radius:10px;padding:11px 15px;color:#ffd88a;font:500 .9rem var(--mono);outline:0;transition:.2s}
.fill-row input:focus{border-color:var(--gold)}
.fill-row input.ok{border-color:var(--teal);color:var(--teal)}
.fill-row input.bad{border-color:var(--coral)}
.fill-row input.shake{animation:shake .4s}
.fb{display:none;margin-top:12px;font:500 .8rem var(--mono)}
.fb.show{display:block}
.fb.good{color:var(--teal)} .fb.badx{color:var(--coral)}
.ex.final{border:1px solid rgba(255,200,97,.55);background:linear-gradient(180deg,rgba(255,200,97,.08),rgba(255,200,97,.02));scroll-margin-top:90px}
.steps{margin-left:22px}
.hint{margin-top:14px;border-top:1px solid rgba(255,200,97,.2);padding-top:10px}
.hint summary{cursor:pointer;font:600 .8rem var(--mono);color:var(--gold);letter-spacing:.06em;list-style:none}
.hint summary::before{content:'▸ '}
.hint[open] summary::before{content:'▾ '}
.hint p,.hint pre{margin-top:10px}
.complete{margin-top:20px}
.complete.did{background:linear-gradient(135deg,var(--teal),#2fae9c);pointer-events:none}
.pager{display:flex;justify-content:space-between;gap:14px;margin-top:48px;padding-top:24px;border-top:1px solid var(--line);flex-wrap:wrap}

/* ---------- practice ---------- */
.pmeter{display:flex;align-items:center;gap:14px;margin-top:20px}
#pCount{font-size:.75rem;color:var(--mut);letter-spacing:.08em}
.practice-set{max-width:760px}
.practice-set .ex{margin-top:26px}
.practice-cta{display:inline-flex;align-items:center;gap:8px;margin-top:34px;padding:13px 20px;border:1px dashed rgba(79,216,196,.5);border-radius:12px;color:var(--teal);font:600 .85rem var(--mono);letter-spacing:.04em;background:rgba(79,216,196,.05);transition:.22s}
.practice-cta:hover{transform:translateX(5px);border-color:var(--teal);background:rgba(79,216,196,.1)}
/* drill selector */
.drill-row{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 6px}
.drill{display:flex;align-items:center;gap:14px;flex:1;min-width:180px;padding:16px 18px;border-radius:13px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-left:3px solid var(--line2);cursor:pointer;transition:.22s;text-align:left;font:inherit;color:inherit}
.drill:hover{transform:translateY(-3px);border-color:var(--gold)}
.drill.cur{border-left-color:var(--gold);background:#16233c;box-shadow:0 8px 22px -12px rgba(255,200,97,.45)}
.drill.done{border-left-color:var(--teal)}
.drill .d-num{font-size:1.05rem;font-weight:700;color:var(--dim)}
.drill.cur .d-num{color:var(--gold)}
.drill .d-body{flex:1;display:flex;flex-direction:column;gap:2px}
.drill .d-body b{font:600 .95rem var(--body)}
.drill .d-body .dim{font-size:.64rem;letter-spacing:.1em;text-transform:uppercase}
.drill .d-st{font-size:1rem;color:var(--dim)}
.drill.done .d-st{color:var(--teal)}
#drillStage .ex{margin-top:22px}

/* ---------- modal / toast / sparks / reveal ---------- */
.mroot{position:fixed;inset:0;z-index:120;display:grid;place-items:center;background:rgba(4,8,18,.72);backdrop-filter:blur(5px);opacity:0;transition:opacity .2s}
.mroot.open{opacity:1}
.modal{position:relative;width:min(460px,92vw);max-height:86vh;overflow:auto;background:#0f1b31;border:1px solid var(--line2);border-radius:16px;padding:26px;box-shadow:0 40px 80px -30px #000;transform:translateY(14px) scale(.97);transition:transform .22s}
.mroot.open .modal{transform:none}
.mx{position:absolute;top:14px;right:14px;background:none;border:0;color:var(--dim);font-size:1rem;padding:6px;transition:.2s}
.mx:hover{color:var(--coral);transform:rotate(90deg)}
.pf{display:flex;align-items:center;gap:16px;margin:16px 0 20px}
.pf b{font:700 1.2rem var(--disp);display:block}
.pf-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.pf-stats div{background:#0c1729;border:1px solid var(--line);border-radius:11px;padding:14px;text-align:center}
.pf-stats b{display:block;font-size:1.15rem;color:var(--gold)}
.pf-stats span{font-size:.64rem;color:var(--dim);text-transform:uppercase;letter-spacing:.1em}
.set{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 4px;border-bottom:1px solid var(--line);font-size:.92rem;cursor:pointer}
.set input{accent-color:var(--gold);width:17px;height:17px;cursor:pointer}
#toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,90px);z-index:200;background:#101c33;border:1px solid rgba(255,200,97,.5);color:var(--text);font:500 .82rem var(--mono);padding:13px 22px;border-radius:12px;box-shadow:0 18px 40px -14px #000;opacity:0;transition:.35s cubic-bezier(.2,.9,.3,1.2);max-width:92vw}
#toast.show{transform:translate(-50%,0);opacity:1}
.spark{position:fixed;z-index:210;color:var(--gold);pointer-events:none;animation:fly .85s ease-out forwards;text-shadow:0 0 8px rgba(255,200,97,.8)}
@keyframes fly{to{transform:translate(var(--dx),var(--dy)) scale(.25) rotate(140deg);opacity:0}}
.rv{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.rv.on{opacity:1;transform:none}
.rm *,.rm *::before,.rm *::after{animation:none!important;transition:none!important}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .hero{grid-template-columns:1fr;min-height:0;gap:34px}
  .h-right{flex-direction:row;flex-wrap:wrap}
  .tile{flex:1;min-width:150px}
  .lesson{grid-template-columns:1fr}
  .side{position:static}
  .chap{max-height:none;flex-direction:row;overflow-x:auto;padding-bottom:6px}
  .ch{flex:none}
}
@media(max-width:880px){ .nav{display:none} .burger{display:flex} }
@media(max-width:620px){
  .hd .search{display:none}
  .hd-in{gap:12px}
  .cont{flex-wrap:wrap}
  .lh-top{flex-direction:column}
}

/* ---------- exercises · grouped by language ---------- */
.exlang{margin-top:48px;padding-left:22px;border-left:3px solid color-mix(in srgb,var(--bc) 55%,transparent)}
.exlang-h{display:flex;align-items:center;gap:16px;margin-bottom:8px;flex-wrap:wrap}
.exlang-h h2{font-size:1.55rem}
.exlang-h .more{margin-left:auto}

/* ---------- mobile menu ---------- */
.burger{display:none;flex-direction:column;gap:5px;width:42px;height:42px;border:1px solid var(--line2);border-radius:10px;background:#0d1830;align-items:center;justify-content:center;flex:none;cursor:pointer;transition:.2s}
.burger span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:.25s}
.burger:hover{border-color:var(--gold)}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mnav{position:absolute;left:0;right:0;top:100%;background:rgba(7,12,24,.97);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line2);padding:0 22px;max-height:0;overflow:hidden;opacity:0;pointer-events:none;transition:max-height .3s ease,opacity .25s ease,padding .3s ease;z-index:55}
.mnav.open{max-height:440px;opacity:1;pointer-events:auto;padding:16px 22px 22px}
.mnav-search{display:flex;align-items:center;gap:9px;background:#0d1830;border:1px solid var(--line);border-radius:10px;padding:10px 13px;color:var(--dim);margin-bottom:12px}
.mnav-search input{flex:1;background:none;border:0;outline:0;color:var(--text);font:400 .9rem var(--body);min-width:0}
.mnav-links{display:flex;flex-direction:column;gap:2px}
.mnav-links a{padding:12px 6px;font:600 1rem var(--disp);color:var(--mut);border-bottom:1px solid var(--line);transition:.18s}
.mnav-links a:hover{color:var(--gold);padding-left:12px}
.link-forgot{font:500 .72rem var(--mono);color:var(--dim);letter-spacing:.04em;transition:.18s}
.link-forgot:hover{color:var(--gold)}
.fl-row{display:flex;justify-content:flex-end;margin-top:-2px}

/* ---------- 404 ---------- */
.notfound{max-width:1220px;margin:0 auto;padding:70px 26px 90px;display:grid;grid-template-columns:auto 1fr;gap:48px;align-items:center;min-height:64vh}
.nf-ghost{font:700 clamp(7rem,22vw,16rem)/.8 var(--disp);letter-spacing:-.04em;color:transparent;-webkit-text-stroke:2px color-mix(in srgb,var(--gold) 55%,transparent);position:relative;user-select:none}
.nf-ghost::after{content:'404';position:absolute;inset:0;color:color-mix(in srgb,var(--gold) 12%,transparent);-webkit-text-stroke:0;z-index:-1;filter:blur(2px)}
.nf-body .eyebrow{display:block;margin-bottom:14px}
.nf-body h1{font-size:clamp(1.8rem,4vw,2.8rem);margin-bottom:12px}
.nf-body h1 em{font-style:normal;color:var(--gold)}
.nf-body p{color:var(--mut);max-width:46ch;margin-bottom:26px}
.nf-actions{display:flex;gap:12px;flex-wrap:wrap}
@media(max-width:760px){ .notfound{grid-template-columns:1fr;gap:14px} .nf-ghost{font-size:clamp(6rem,30vw,10rem)} }