/* ============================================================
   QUIZVERSE · Theme
   "Electric Lab" — a light, technical palette: cool slate
   neutrals, an indigo → violet → cyan signal gradient, and
   dark IDE panels for every piece of code.
   Designed & built by Arham Ashraf
   ============================================================ */

:root{
  /* ---- canvas ---- */
  --bg:#F5F7FB;
  --bg-2:#ECEFF6;
  --surface:#FFFFFF;
  --surface-2:#F8F9FC;
  --glass:rgba(255,255,255,.78);

  /* ---- ink ---- */
  --ink:#0B1221;
  --ink-2:#38435E;
  --ink-3:#69748F;
  --ink-4:#A1A9BF;

  /* ---- signal ---- */
  --brand:#4F46E5;
  --brand-2:#7C3AED;
  --brand-3:#06B6D4;
  --brand-ink:#3730A3;
  --brand-soft:#EEF0FF;
  --brand-soft-2:#E0E4FF;
  --grad:linear-gradient(120deg,#4F46E5 0%,#7C3AED 50%,#06B6D4 100%);
  --grad-h:linear-gradient(90deg,#4F46E5,#7C3AED 55%,#06B6D4);
  --grad-soft:linear-gradient(120deg,rgba(79,70,229,.10),rgba(124,58,237,.08) 50%,rgba(6,182,212,.10));
  --ring-brand:0 0 0 4px rgba(79,70,229,.16);

  /* ---- semantic ---- */
  --ok:#059669;   --ok-2:#10B981;  --ok-soft:#E6F7F0;
  --bad:#E11D48;  --bad-2:#F43F5E; --bad-soft:#FDEBEF;
  --warn:#D97706; --warn-2:#F59E0B;--warn-soft:#FEF3E2;
  --info:#0284C7; --info-2:#0EA5E9;--info-soft:#E4F4FC;

  /* ---- IDE ---- */
  --ide-bg:#0B1020;
  --ide-bg-2:#121A33;
  --ide-bar:#0E1529;
  --ide-line:rgba(255,255,255,.07);
  --ide-text:#E4E9F6;
  --ide-dim:#5D6789;
  --syn-kw:#C792EA;
  --syn-fn:#82AAFF;
  --syn-str:#C3E88D;
  --syn-num:#F78C6C;
  --syn-cm:#66708F;
  --syn-op:#89DDFF;

  /* ---- lines ---- */
  --line:rgba(11,18,33,.08);
  --line-2:rgba(11,18,33,.14);

  /* ---- elevation ---- */
  --e1:0 1px 2px rgba(11,18,33,.05),0 1px 3px rgba(11,18,33,.04);
  --e2:0 2px 4px rgba(11,18,33,.04),0 8px 24px rgba(11,18,33,.06);
  --e3:0 4px 10px rgba(11,18,33,.05),0 18px 44px rgba(11,18,33,.09);
  --e4:0 10px 20px rgba(11,18,33,.06),0 32px 72px rgba(11,18,33,.13);
  --e-brand:0 10px 28px rgba(79,70,229,.30);

  /* ---- radii ---- */
  --r-xs:8px; --r-sm:10px; --r-md:14px; --r-lg:20px; --r-xl:28px; --r-pill:999px;

  /* ---- type ---- */
  --font-display:"Space Grotesk","Segoe UI Variable Display","Segoe UI",system-ui,-apple-system,sans-serif;
  --font-body:"Inter","Segoe UI Variable Text","Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
  --font-mono:"JetBrains Mono","Cascadia Code","Cascadia Mono",Consolas,"SF Mono",Menlo,monospace;

  /* ---- motion ---- */
  --ease:cubic-bezier(.22,1,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --ease-swift:cubic-bezier(.65,0,.35,1);

  /* ---- layout ---- */
  --shell:1200px;
  --gutter:clamp(16px,4vw,44px);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  font-family:var(--font-body);
  font-size:15.5px;
  line-height:1.6;
  color:var(--ink-2);
  background:var(--bg);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  font-feature-settings:"cv11","ss01","ss03";
}

html.has-luxe-cursor,
html.has-luxe-cursor *{cursor:none !important}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-family:var(--font-display);color:var(--ink);font-weight:700;letter-spacing:-.025em;line-height:1.08}
h1{font-size:clamp(2.5rem,6.2vw,4.6rem);letter-spacing:-.04em}
h2{font-size:clamp(1.65rem,3.4vw,2.5rem);letter-spacing:-.03em}
h3{font-size:clamp(1.15rem,2vw,1.4rem)}
h4{font-size:1rem;font-family:var(--font-body);font-weight:700;letter-spacing:-.01em}
p{max-width:68ch}
a{color:inherit;text-decoration:none}
strong,b{color:var(--ink);font-weight:700}
code,kbd,pre{font-family:var(--font-mono)}

.mono{font-family:var(--font-mono);letter-spacing:-.01em}
.nums{font-variant-numeric:tabular-nums}
.muted{color:var(--ink-3)}
.tiny{font-size:.8rem}
.lede{font-size:clamp(1rem,1.4vw,1.12rem);line-height:1.7;color:var(--ink-2)}

.grad-text{
  background:var(--grad);background-size:200% auto;
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  animation:gradShift 8s ease-in-out infinite;
}

/* terminal-style kicker:  > section_name */
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.74rem;font-weight:600;letter-spacing:.02em;
  color:var(--brand);text-transform:lowercase;
}
.kicker::before{content:">";color:var(--brand-3);font-weight:700}

/* inline code in prose */
p code,li code,.explain code,.prose code{
  font-size:.86em;padding:2px 6px;border-radius:6px;
  background:var(--brand-soft);color:var(--brand-ink);
}

/* ---------- layout ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.shell-wide{max-width:1420px}
.row{display:flex;align-items:center}
.col{display:flex;flex-direction:column}
.between{justify-content:space-between}
.center{justify-content:center;align-items:center}
.wrap{flex-wrap:wrap}
.grow{flex:1;min-width:0}
.g4{gap:4px}.g6{gap:6px}.g8{gap:8px}.g10{gap:10px}.g12{gap:12px}.g16{gap:16px}.g20{gap:20px}.g24{gap:24px}.g32{gap:32px}
.hidden{display:none !important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.rule{height:1px;background:var(--line);border:0}

/* ---------- ambient background ---------- */
.ambient{position:fixed;inset:0;z-index:-3;overflow:hidden;pointer-events:none;background:var(--bg)}
.ambient__grid{
  position:absolute;inset:0;
  background-image:radial-gradient(rgba(79,70,229,.16) 1px,transparent 1.3px);
  background-size:24px 24px;
  -webkit-mask-image:radial-gradient(ellipse 80% 65% at 50% 0%,#000 25%,transparent 75%);
  mask-image:radial-gradient(ellipse 80% 65% at 50% 0%,#000 25%,transparent 75%);
}
.ambient__orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;will-change:transform}
.ambient__orb.o1{width:44vw;height:44vw;left:-12vw;top:-18vw;background:radial-gradient(circle,rgba(99,102,241,.55),transparent 68%);animation:orbit 26s var(--ease) infinite}
.ambient__orb.o2{width:38vw;height:38vw;right:-10vw;top:-6vw;background:radial-gradient(circle,rgba(6,182,212,.42),transparent 68%);animation:orbit 32s var(--ease) infinite reverse}
.ambient__orb.o3{width:40vw;height:40vw;left:30vw;bottom:-28vw;background:radial-gradient(circle,rgba(168,85,247,.32),transparent 68%);animation:orbit 38s var(--ease) infinite}

/* ---------- watermark — Arham Ashraf ---------- */
.watermark{
  position:fixed;inset:0;z-index:-1;pointer-events:none;user-select:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='420' height='260'%3E%3Ctext x='50%25' y='50%25' text-anchor='middle' dominant-baseline='middle' transform='rotate(-22 210 130)' font-family='Segoe UI,Arial,sans-serif' font-size='21' font-weight='700' letter-spacing='7' fill='%234F46E5' fill-opacity='0.055'%3EARHAM ASHRAF%3C/text%3E%3C/svg%3E");
  background-repeat:repeat;
}

.signature{
  position:fixed;left:16px;bottom:16px;z-index:690;
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 14px 7px 8px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(14px) saturate(160%);-webkit-backdrop-filter:blur(14px) saturate(160%);
  box-shadow:var(--e2),inset 0 0 0 1px var(--line);
  font-size:.74rem;color:var(--ink-3);font-weight:600;
  pointer-events:none;user-select:none;
}
.signature__mark{
  width:24px;height:24px;border-radius:7px;display:grid;place-items:center;
  background:var(--grad);color:#fff;font-family:var(--font-mono);font-size:.62rem;font-weight:700;
}
.signature strong{color:var(--ink);font-weight:750;letter-spacing:-.005em}
@media (max-width:640px){.signature{left:10px;bottom:10px;font-size:.68rem}}

/* ---------- scrollbar / selection / focus ---------- */
*::-webkit-scrollbar{width:11px;height:11px}
*::-webkit-scrollbar-track{background:transparent}
*::-webkit-scrollbar-thumb{background:linear-gradient(#6366F1,#06B6D4);border-radius:99px;border:3px solid var(--bg)}
::selection{background:rgba(79,70,229,.18);color:var(--ink)}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}

@media (max-width:720px){body{font-size:15px}p{max-width:100%}}