/* ============================================================
   course.css — «Code Quest» дизайн-система витрины ЦОР
   «Игровые основы программирования». Тёмная премиум-тема
   со светлым переключателем, живыми анимациями и canvas-героем.
   ============================================================ */

:root{
  --blue:#4f8cff; --cyan:#22d3ee; --violet:#a78bfa; --green:#34d399; --amber:#fbbf24; --pink:#f472b6; --red:#fb7185;
  --grad:linear-gradient(135deg,#4f8cff,#22d3ee);
  --grad-warm:linear-gradient(135deg,#a78bfa,#f472b6);
  --grad-soft:linear-gradient(135deg,rgba(79,140,255,.18),rgba(34,211,238,.12));

  --bg:#080b16; --bg2:#0d1424; --bg3:#111a30;
  --surface:rgba(255,255,255,.04); --surface2:rgba(255,255,255,.07);
  --border:rgba(255,255,255,.09); --border2:rgba(255,255,255,.17);
  --t1:#eef3fb; --t2:#aab7cd; --t3:#6e7d96;
  --glow:0 0 0 1px rgba(79,140,255,.25),0 18px 50px -12px rgba(34,211,238,.35);
  --sh:0 14px 50px -18px rgba(0,0,0,.7);
  --sh-sm:0 6px 22px -10px rgba(0,0,0,.6);
  --r:16px; --r-lg:24px; --r-xl:32px;
  --maxw:1160px;
  --ff:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --fd:'Unbounded','Inter',sans-serif;
  --fm:'JetBrains Mono',ui-monospace,monospace;
}
[data-theme="light"]{
  --bg:#eef3fb; --bg2:#ffffff; --bg3:#f3f7fd;
  --surface:rgba(13,30,60,.035); --surface2:rgba(13,30,60,.06);
  --border:rgba(13,30,60,.10); --border2:rgba(13,30,60,.18);
  --t1:#0c1730; --t2:#42526b; --t3:#76869c;
  --glow:0 0 0 1px rgba(79,140,255,.18),0 22px 50px -16px rgba(79,140,255,.30);
  --sh:0 18px 50px -20px rgba(20,50,90,.30);
  --sh-sm:0 8px 26px -14px rgba(20,50,90,.22);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--ff);background:var(--bg);color:var(--t1);line-height:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;position:relative;min-height:100vh;
}
a{color:var(--cyan);text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(79,140,255,.35);color:#fff}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ---------- ambient background ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.bg-fx::before{
  content:"";position:absolute;inset:-2px;
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:48px 48px;-webkit-mask-image:radial-gradient(circle at 50% 0%,#000,transparent 75%);mask-image:radial-gradient(circle at 50% 0%,#000,transparent 75%);
  opacity:.6;
}
.blob{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;animation:float 18s ease-in-out infinite}
.blob.b1{width:520px;height:520px;background:radial-gradient(circle,#4f8cff,transparent 70%);top:-160px;right:-120px}
.blob.b2{width:480px;height:480px;background:radial-gradient(circle,#22d3ee,transparent 70%);top:30%;left:-180px;animation-delay:-6s}
.blob.b3{width:440px;height:440px;background:radial-gradient(circle,#a78bfa,transparent 70%);bottom:-160px;right:10%;animation-delay:-11s}
@keyframes float{0%,100%{transform:translateY(0) translateX(0) scale(1)}50%{transform:translateY(-40px) translateX(20px) scale(1.08)}}

.container{max-width:var(--maxw);margin:0 auto;padding:0 1.4rem}
section{padding:5.5rem 0;position:relative}
@media(max-width:680px){section{padding:3.5rem 0}}

/* ---------- typography helpers ---------- */
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan);background:var(--surface);border:1px solid var(--border);padding:.4rem .9rem;border-radius:100px;margin-bottom:1.1rem}
.eyebrow .pulse{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 rgba(34,211,238,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,211,238,.6)}70%{box-shadow:0 0 0 9px rgba(34,211,238,0)}100%{box-shadow:0 0 0 0 rgba(34,211,238,0)}}
h2.sec-title{font-family:var(--fd);font-size:clamp(1.7rem,4vw,2.6rem);font-weight:700;letter-spacing:-.01em;line-height:1.1;margin-bottom:.7rem}
.sec-sub{color:var(--t2);font-size:1.05rem;max-width:640px;margin-bottom:2.4rem}
.g{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.gw{background:var(--grad-warm);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}.reveal[data-d="2"]{transition-delay:.16s}.reveal[data-d="3"]{transition-delay:.24s}.reveal[data-d="4"]{transition-delay:.32s}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:100;backdrop-filter:blur(16px);background:color-mix(in srgb,var(--bg) 72%,transparent);
  border-bottom:1px solid transparent;transition:border-color .3s,background .3s}
.nav.scrolled{border-color:var(--border)}
.nav-progress{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--grad);box-shadow:0 0 12px var(--cyan)}
.nav-in{max-width:var(--maxw);margin:0 auto;padding:.85rem 1.4rem;display:flex;align-items:center;gap:1rem}
.brand{display:flex;align-items:center;gap:.65rem;font-weight:800;color:var(--t1);font-family:var(--fd);font-size:15px}
.brand .logo{width:38px;height:38px;border-radius:11px;background:var(--grad);display:flex;align-items:center;justify-content:center;
  font-family:var(--fm);font-weight:700;color:#04101f;box-shadow:var(--glow)}
.brand small{display:block;font-family:var(--ff);font-size:10.5px;font-weight:600;color:var(--t3);letter-spacing:.02em}
.nav-links{margin-left:auto;display:flex;gap:.25rem;align-items:center}
.nav-links a{padding:.5rem .85rem;border-radius:10px;font-size:14px;font-weight:600;color:var(--t2);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--t1);background:var(--surface)}
.nav-links a.ghost{border:1px solid var(--border2);color:var(--t1)}
.icon-btn{width:40px;height:40px;border-radius:11px;border:1px solid var(--border);background:var(--surface);color:var(--t1);cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:background .2s,transform .2s}
.icon-btn:hover{background:var(--surface2);transform:translateY(-1px)}
.icon-btn svg{width:19px;height:19px}
.nav-burger{display:none;flex-direction:column;gap:5px;width:40px;height:40px;border:1px solid var(--border);border-radius:11px;background:var(--surface);cursor:pointer;align-items:center;justify-content:center}
.nav-burger span{width:20px;height:2px;background:var(--t1);border-radius:2px;transition:.25s}
@media(max-width:880px){
  .nav-links{position:fixed;inset:64px 1rem auto 1rem;flex-direction:column;background:var(--bg2);border:1px solid var(--border);
    border-radius:var(--r-lg);padding:.7rem;box-shadow:var(--sh);transform:translateY(-12px);opacity:0;pointer-events:none;transition:.25s}
  .nav-links.open{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{width:100%}
  .nav-burger{display:flex}
}

/* ---------- buttons ---------- */
.btn{position:relative;display:inline-flex;align-items:center;gap:.55rem;padding:.95rem 1.7rem;border-radius:100px;font-weight:700;font-size:15px;
  cursor:pointer;border:none;transition:transform .18s,box-shadow .25s;font-family:var(--ff);white-space:nowrap;overflow:hidden}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--grad);color:#04101f;box-shadow:0 12px 34px -10px rgba(79,140,255,.7)}
.btn-primary:hover{box-shadow:0 18px 44px -10px rgba(34,211,238,.75)}
.btn-primary::after{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(120deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-20deg);transition:left .6s}
.btn-primary:hover::after{left:140%}
.btn-ghost{background:var(--surface);color:var(--t1);border:1px solid var(--border2)}
.btn-ghost:hover{background:var(--surface2)}

/* ---------- hero ---------- */
.hero{padding:3.5rem 0 4.5rem;position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:3rem;align-items:center}
@media(max-width:880px){.hero-grid{grid-template-columns:1fr;gap:2.2rem}}
.hero h1{font-family:var(--fd);font-size:clamp(1.9rem,5.6vw,3.9rem);font-weight:700;line-height:1.05;letter-spacing:-.02em;margin:.4rem 0 1.1rem;overflow-wrap:break-word}
@media(max-width:400px){.hero h1{font-size:1.75rem}}
.hero .lead{font-size:1.15rem;color:var(--t2);max-width:540px;margin-bottom:1.7rem}
.hero-meta{display:flex;flex-wrap:wrap;gap:.55rem;margin-bottom:2rem}
.chip{display:inline-flex;align-items:center;gap:.4rem;background:var(--surface);border:1px solid var(--border);border-radius:100px;
  padding:.45rem .9rem;font-size:13px;font-weight:600;color:var(--t2)}
.cta-row{display:flex;gap:.8rem;flex-wrap:wrap}

/* console frame for canvas */
.console{position:relative;border-radius:var(--r-xl);background:linear-gradient(160deg,var(--bg2),var(--bg3));
  border:1px solid var(--border2);box-shadow:var(--sh),var(--glow);padding:14px;overflow:hidden}
.console::before{content:"";position:absolute;inset:0;border-radius:var(--r-xl);padding:1px;
  background:linear-gradient(140deg,rgba(79,140,255,.6),transparent 40%,transparent 60%,rgba(34,211,238,.5));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.console-bar{display:flex;align-items:center;gap:6px;padding:4px 6px 12px}
.console-bar i{width:11px;height:11px;border-radius:50%;display:block}
.console-bar i:nth-child(1){background:#fb7185}.console-bar i:nth-child(2){background:#fbbf24}.console-bar i:nth-child(3){background:#34d399}
.console-bar span{margin-left:auto;font-family:var(--fm);font-size:11px;color:var(--t3)}
.console .stage{position:relative;aspect-ratio:520 / 420;border-radius:16px;overflow:hidden;background:radial-gradient(circle at 50% 38%,var(--bg3),var(--bg2))}
.console .stage > canvas,.console .stage > #hero3d{position:absolute;inset:0;width:100%;height:100%;display:block}
.console .stage > #hero3d canvas{width:100%;height:100%;display:block}
.console-cap{display:block;margin:.9rem auto 2px;text-align:center;font-size:12.5px;line-height:1.45;color:var(--t2);max-width:36ch}
.console-cap b{color:var(--t1);font-weight:700}
.float-sym{position:absolute;font-family:var(--fm);font-weight:700;color:var(--t3);opacity:.5;animation:bob 6s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}

/* ---------- stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;margin-top:1rem}
@media(max-width:680px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--bg2);padding:1.5rem 1rem;text-align:center}
.stat .v{font-family:var(--fd);font-size:clamp(1.6rem,3.5vw,2.2rem);font-weight:700;line-height:1}
.stat .l{font-size:12.5px;color:var(--t3);margin-top:.4rem}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:1.3rem}
.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:820px){.g3{grid-template-columns:1fr}.g2{grid-template-columns:1fr}}
.card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:1.7rem;
  transition:transform .25s,border-color .25s,box-shadow .25s;backdrop-filter:blur(4px)}
.card:hover{transform:translateY(-4px);border-color:var(--border2);box-shadow:var(--sh-sm)}
.card h3{font-size:1.12rem;font-weight:800;margin-bottom:.6rem;display:flex;align-items:center;gap:.6rem;letter-spacing:-.01em}
.card p{color:var(--t2);font-size:14.5px}
.card ul{padding-left:1.15rem;color:var(--t2);font-size:14.5px}
.card ul li{margin:.32rem 0}
.card ul li::marker{color:var(--cyan)}
.ic{width:46px;height:46px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0;
  background:var(--grad-soft);border:1px solid var(--border)}
.card.tinted{background:var(--grad-soft)}

/* ---------- metrics ---------- */
.metrics{display:grid;grid-template-columns:repeat(5,1fr);gap:1rem}
@media(max-width:820px){.metrics{grid-template-columns:repeat(2,1fr)}}
.metric{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:1.3rem 1rem;text-align:center;transition:transform .2s,border-color .2s}
.metric:hover{transform:translateY(-3px);border-color:var(--border2)}
.metric .v{font-family:var(--fd);font-size:1.7rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.05}
.metric .l{font-size:12px;color:var(--t3);margin-top:.35rem}

/* ---------- timeline ---------- */
.timeline{position:relative;margin-top:1rem}
.timeline::before{content:"";position:absolute;left:19px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--blue),var(--cyan),var(--violet))}
.tl{position:relative;padding:0 0 1.6rem 3.4rem}
.tl::before{content:attr(data-n);position:absolute;left:0;top:-2px;width:40px;height:40px;border-radius:12px;background:var(--bg2);border:1px solid var(--border2);
  display:flex;align-items:center;justify-content:center;font-family:var(--fd);font-weight:700;font-size:15px;color:var(--t2)}
.tl.hot::before{background:var(--grad);color:#04101f;border:none;box-shadow:var(--glow)}
.tl h4{font-size:1.05rem;font-weight:700}
.tl p{font-size:14px;color:var(--t2)}
.tl-badge{display:inline-block;font-size:11px;font-weight:700;color:#04101f;background:var(--amber);border-radius:100px;padding:.12rem .6rem;margin-left:.5rem;vertical-align:middle}

/* ---------- module section ---------- */
.module-hero{display:flex;align-items:center;gap:1.4rem;flex-wrap:wrap;padding:2rem;border-radius:var(--r-xl);
  background:var(--grad-soft);border:1px solid var(--border2);box-shadow:var(--sh-sm);margin-bottom:2.6rem;position:relative;overflow:hidden}
.module-hero .big-ic{width:74px;height:74px;border-radius:20px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:36px;box-shadow:var(--glow);flex-shrink:0}
.module-hero h2{font-family:var(--fd);font-size:1.9rem;font-weight:700}
.module-hero p{color:var(--t2);font-size:14.5px;max-width:560px}
.step-tag{display:flex;align-items:center;gap:.7rem;font-size:13px;font-weight:700;letter-spacing:.02em;color:var(--t1);margin:0 0 1rem}
.step-tag .dot{width:30px;height:30px;border-radius:50%;background:var(--grad);color:#04101f;display:flex;align-items:center;justify-content:center;font-family:var(--fd);font-weight:700;font-size:14px;flex-shrink:0}

/* video */
.video-wrap{position:relative;border-radius:var(--r-lg);overflow:hidden;background:#000;aspect-ratio:16/9;border:1px solid var(--border2);box-shadow:var(--sh)}
.video-wrap video,.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:contain;background:#000}

/* lecture */
.lecture{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:2rem;backdrop-filter:blur(4px)}
.lecture h4{font-family:var(--fd);font-size:1.15rem;font-weight:700;margin:1.6rem 0 .55rem}
.lecture h4:first-child{margin-top:0}
.lecture p{color:var(--t2);margin:.5rem 0}
.lecture ul{padding-left:1.2rem;color:var(--t2);margin:.5rem 0}
.lecture ul li::marker{color:var(--cyan)}
.note{border-left:3px solid var(--cyan);background:var(--grad-soft);padding:.95rem 1.15rem;border-radius:0 var(--r) var(--r) 0;margin:1.1rem 0;font-size:14.5px;color:var(--t1)}
.note.ok{border-color:var(--green)}
.code{background:#060a14;border:1px solid var(--border);color:#cde0f7;font-family:var(--fm);font-size:14px;border-radius:14px;padding:1.1rem 1.3rem;margin:.9rem 0;line-height:1.75;overflow-x:auto}
[data-theme="light"] .code{background:#0b1426;color:#e2ecfb}
.code .kw{color:#7cc4ff}.code .num{color:#fbbf24}.code .cur{background:rgba(251,191,36,.22);border-radius:4px;padding:0 3px}

/* interactive loop demo */
.demo{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;align-items:center;margin:1.3rem 0;padding:1.4rem;
  background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r-lg)}
@media(max-width:680px){.demo{grid-template-columns:1fr}}
.demo canvas{width:100%;height:auto;border-radius:14px;background:radial-gradient(circle at 50% 45%,var(--bg3),var(--bg2));border:1px solid var(--border)}
.demo-code{font-family:var(--fm);font-size:13.5px;line-height:1.9;background:#060a14;border:1px solid var(--border);border-radius:14px;padding:1rem 1.2rem;color:#cde0f7}
.demo-code .line{padding:0 .4rem;border-radius:5px;transition:background .2s}
.demo-code .line.on{background:rgba(79,140,255,.22)}
.demo-ctrls{display:flex;gap:.6rem;margin-top:.9rem;flex-wrap:wrap}
.demo-iter{font-family:var(--fm);font-size:13px;color:var(--cyan);margin-top:.6rem}

/* infographics */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
@media(max-width:820px){.info-grid{grid-template-columns:1fr}}
.info-grid figure{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:transform .25s,border-color .25s}
.info-grid figure:hover{transform:translateY(-4px);border-color:var(--border2)}
.info-grid img{cursor:zoom-in;width:100%;background:#fff}
.info-grid figcaption{padding:.8rem 1rem;font-size:12.5px;color:var(--t2)}
.info-grid figcaption b{display:block;color:var(--cyan);text-transform:uppercase;font-size:10.5px;letter-spacing:.05em;margin-bottom:.2rem}

/* embeds */
.embed{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:1.1rem 1.2rem;margin-bottom:1.2rem}
.embed-head{display:flex;justify-content:space-between;align-items:center;gap:.6rem;margin-bottom:.8rem;flex-wrap:wrap}
.embed-head b{font-size:14.5px;font-weight:700}
.embed-head .tag{font-size:10.5px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--green);border:1px solid color-mix(in srgb,var(--green) 50%,transparent);border-radius:100px;padding:.15rem .6rem}
.embed iframe{width:100%;border:0;border-radius:12px;background:#fff;display:block}

/* task boxes */
.task-box{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:1.2rem 1.4rem;margin-bottom:1rem;overflow:hidden}
.task-box::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--grad)}
.task-box h4{font-size:15px;font-weight:700;margin-bottom:.3rem}
.task-box p{font-size:14px;color:var(--t2)}

/* table */
.tablecard{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:.6rem;overflow-x:auto}
table.t{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
table.t thead th{text-align:left;color:var(--t3);font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;padding:.85rem .9rem;font-weight:700}
table.t td{padding:.8rem .9rem;border-top:1px solid var(--border);color:var(--t2)}
table.t tbody tr:hover td{background:var(--surface)}
.scale{display:flex;border-radius:100px;overflow:hidden;border:1px solid var(--border);font-size:12px;font-weight:700;color:#04101f;margin:.4rem 0 1rem}
.scale span{padding:.5rem;text-align:center}

/* quiz */
.quiz{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:1.9rem;backdrop-filter:blur(4px)}
.q{border-bottom:1px solid var(--border);padding:1.3rem 0}
.q:first-of-type{padding-top:.4rem}.q:last-of-type{border-bottom:none}
.q-head{display:flex;justify-content:space-between;gap:.6rem;align-items:baseline;margin-bottom:.8rem;flex-wrap:wrap}
.q-num{font-weight:700;font-size:15px}
.q-type{font-size:10.5px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--violet);background:color-mix(in srgb,var(--violet) 14%,transparent);
  border:1px solid color-mix(in srgb,var(--violet) 40%,transparent);border-radius:100px;padding:.15rem .6rem}
.opt{display:flex;align-items:center;gap:.7rem;padding:.7rem .95rem;border:1px solid var(--border);border-radius:12px;margin:.45rem 0;cursor:pointer;font-size:14.5px;color:var(--t2);transition:border-color .15s,background .15s,color .15s}
.opt:hover{border-color:var(--border2);background:var(--surface2);color:var(--t1)}
.opt input{accent-color:var(--blue);width:18px;height:18px;flex-shrink:0}
.q input[type=text]{width:100%;max-width:300px;padding:.7rem .9rem;border:1px solid var(--border2);border-radius:12px;font-size:14.5px;font-family:inherit;background:var(--bg2);color:var(--t1)}
.q select{padding:.55rem .8rem;border:1px solid var(--border2);border-radius:10px;font-size:14px;font-family:inherit;background:var(--bg2);color:var(--t1);margin:.2rem .4rem .2rem 0}
.match-row{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;margin:.45rem 0;font-size:14.5px;color:var(--t2)}
.q.right{background:color-mix(in srgb,var(--green) 8%,transparent);border-radius:14px;padding-left:.9rem;padding-right:.9rem}
.q.wrong{background:color-mix(in srgb,var(--red) 7%,transparent);border-radius:14px;padding-left:.9rem;padding-right:.9rem}
.q-fb{font-size:13.5px;font-weight:600;margin-top:.6rem;display:none}
.q.right .q-fb.ok{display:block;color:var(--green)}
.q.wrong .q-fb.no{display:block;color:var(--red)}
.quiz-actions{display:flex;align-items:center;gap:1rem;margin-top:1.6rem;flex-wrap:wrap}
.score{font-weight:700}
.score .big{font-family:var(--fd);background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* footer */
footer{border-top:1px solid var(--border);padding:3.5rem 0 2.6rem;margin-top:2rem;background:var(--bg2)}
.f-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
@media(max-width:820px){.f-grid{grid-template-columns:1fr}}
footer h4{font-family:var(--fd);font-size:1.05rem;margin-bottom:.7rem}
footer p,footer li{font-size:14px;color:var(--t2)}
footer ul{list-style:none}footer ul li{margin:.4rem 0}
footer a{color:var(--t2)}footer a:hover{color:var(--cyan)}
.f-bottom{max-width:var(--maxw);margin:2rem auto 0;padding:1.4rem 1.4rem 0;border-top:1px solid var(--border);
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:13px;color:var(--t3)}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(4,8,16,.92);backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center;z-index:3000;padding:2rem;cursor:zoom-out}
.lb.on{display:flex}
.lb img{max-width:100%;max-height:90vh;border-radius:12px;box-shadow:0 30px 80px rgba(0,0,0,.7)}
.lb-x{position:absolute;top:18px;right:24px;width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.25);font-size:1.6rem;cursor:pointer}

/* to-top */
.totop{position:fixed;right:1.4rem;bottom:1.4rem;width:46px;height:46px;border-radius:14px;background:var(--grad);color:#04101f;border:none;
  cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transform:translateY(10px);transition:.3s;box-shadow:var(--glow);z-index:90}
.totop.show{opacity:1;pointer-events:auto;transform:none}

.divider{height:1px;background:var(--border);max-width:var(--maxw);margin:0 auto}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1!important;transform:none!important}
}

/* ============ ПРЕМИУМ-СЛОЙ (fx) ============ */
.grain{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.04;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
[data-theme="light"] .grain{opacity:.055;mix-blend-mode:multiply}
[data-tilt]{transition:transform .25s cubic-bezier(.22,1,.36,1);will-change:transform}
[data-magnetic]{transition:transform .2s cubic-bezier(.22,1,.36,1)}
.console[data-spotlight]::after{content:"";position:absolute;inset:0;border-radius:var(--r-xl);pointer-events:none;z-index:3;
  background:radial-gradient(280px circle at var(--mx,50%) var(--my,0%),rgba(79,140,255,.20),transparent 62%);opacity:0;transition:opacity .35s}
.console[data-spotlight]:hover::after{opacity:1}
.hero h1 .g{background-size:220% auto;animation:shine 7s linear infinite}
@keyframes shine{to{background-position:220% center}}