*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#06060f;--surface:#10131d;--surface-2:#151a25;--text:#f6f8ff;--muted:#a8b1c7;
  --teal:#5eead4;--green:#4ade80;--gold:#fbbf24;--coral:#fb7185;--violet:#c4b5fd;
  --border:rgba(255,255,255,.11);--content:min(1320px,calc(100vw - 132px));
  --pad-top:74px;--pad-bottom:72px;--body:1.28rem;
  --emoji:'Apple Color Emoji','Segoe UI Emoji','Noto Color Emoji','Twemoji Mozilla',sans-serif;
}
html,body{width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif}
body{isolation:isolate}
body::before,body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:-2}
body::before{
  background:
    radial-gradient(ellipse at 12% 16%,rgba(94,234,212,.2),transparent 30%),
    radial-gradient(ellipse at 88% 20%,rgba(251,191,36,.1),transparent 26%),
    radial-gradient(ellipse at 74% 84%,rgba(196,181,253,.14),transparent 32%),
    linear-gradient(145deg,#06060f 0%,#0a1017 45%,#080712 100%);
}
body::after{
  background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:44px 44px;mask-image:radial-gradient(ellipse at center,#000 22%,transparent 78%);
  animation:gridDrift 24s ease-in-out infinite alternate;opacity:.62;
}
@keyframes gridDrift{to{transform:translate3d(18px,12px,0);opacity:.82}}
button,a{font:inherit}
a{color:inherit}
.topbar{
  position:fixed;inset:0 0 auto;height:54px;z-index:30;display:flex;align-items:center;gap:1rem;padding:0 22px;
  background:rgba(6,6,15,.82);backdrop-filter:blur(18px);border-bottom:1px solid var(--border);
}
.topbar-home{color:var(--muted);text-decoration:none;font-size:.82rem;font-weight:700}
.topbar-home:hover{color:var(--teal)}
.deck-name{margin:auto;color:var(--muted);font-size:.76rem;font-weight:750;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lang-picker{position:relative}
.lang-button,.toc-button{
  min-height:36px;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.05);color:var(--text);
  padding:.45rem .68rem;cursor:pointer;font-weight:800;font-size:.76rem;
}
.lang-menu{
  display:none;position:absolute;right:0;top:calc(100% + 8px);width:178px;max-height:min(430px,70vh);overflow:auto;
  padding:.35rem;background:#0d111a;border:1px solid var(--border);border-radius:8px;box-shadow:0 18px 60px rgba(0,0,0,.5);
}
.lang-picker.open .lang-menu{display:block}
.lang-menu a{display:flex;gap:.55rem;padding:.55rem .62rem;border-radius:6px;color:var(--muted);text-decoration:none;font-size:.78rem}
.lang-menu a:hover,.lang-menu a.active{background:rgba(94,234,212,.09);color:var(--teal)}
.deck{position:relative;width:100%;height:100%}
.slide{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:var(--pad-top) 66px var(--pad-bottom);
  opacity:0;pointer-events:none;transform:translateX(32px);transition:opacity .34s ease,transform .34s ease;overflow:auto;
}
.slide.active{opacity:1;pointer-events:auto;transform:none}
.slide.past{transform:translateX(-32px)}
.slide-inner{width:var(--content);max-width:100%;margin:auto;display:grid;gap:22px;min-width:0}
.slide.center .slide-inner{text-align:center;justify-items:center}
.slide.section .slide-inner{text-align:center;justify-items:center;max-width:920px}
.eyebrow{font-family:'Fira Code',monospace;color:var(--teal);font-size:.78rem;font-weight:800;text-transform:uppercase}
h1{font-size:4.4rem;line-height:1.02;letter-spacing:0;text-wrap:balance;overflow-wrap:anywhere}
.section h1{background:linear-gradient(120deg,var(--teal),#7dd3fc,var(--violet));background-clip:text;-webkit-background-clip:text;color:transparent}
.lead{max-width:980px;color:var(--muted);font-size:var(--body);line-height:1.58;text-wrap:pretty}
.bullets{display:grid;gap:12px;list-style:none;max-width:1050px}
.bullets li{position:relative;padding-left:1.45rem;color:var(--muted);font-size:var(--body);line-height:1.5}
.bullets li::before{content:"";position:absolute;left:0;top:.67em;width:8px;height:8px;border-radius:50%;background:var(--teal)}
.bullets li strong{color:var(--text)}
.quote{max-width:1000px;font-size:2.7rem;line-height:1.28;font-weight:850;text-wrap:balance}
.note{max-width:1050px;padding:18px 22px;border:1px solid rgba(94,234,212,.28);border-left:4px solid var(--teal);border-radius:8px;background:rgba(94,234,212,.06);font-size:var(--body);line-height:1.5}
.columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;width:100%}
.column{min-width:0;padding:22px;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.045)}
.column.good{border-color:rgba(74,222,128,.32)}.column.bad{border-color:rgba(251,113,133,.3)}
.column h2{font-size:1.65rem;margin-bottom:12px}
.column.good h2{color:var(--green)}.column.bad h2{color:var(--coral)}
.column ul{display:grid;gap:9px;list-style:none}
.column li{color:var(--muted);font-size:calc(var(--body)*.88);line-height:1.45}
.flow{display:flex;align-items:stretch;gap:8px;width:100%;overflow:auto;padding-bottom:4px}
.flow-step{flex:1 0 120px;display:grid;place-items:center;min-height:88px;padding:12px;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.045);font-weight:800;text-align:center}
.flow-arrow{align-self:center;color:var(--gold);font-size:1.3rem}
.code{
  width:100%;padding:20px 22px;border:1px solid rgba(125,211,252,.2);border-radius:8px;background:#080c12;
  color:#d8e3f4;font:.92rem/1.55 'Fira Code',monospace;white-space:pre;overflow:auto;
}
.comparison{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;width:100%}
.comparison .code{height:100%}
.metric-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;width:100%}
.metric{padding:20px;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.045)}
.metric strong{display:block;color:var(--teal);font-size:1.3rem;margin-bottom:5px}
.metric span{color:var(--muted);line-height:1.4}
.nav-arrow{
  position:fixed;top:50%;z-index:25;width:44px;height:44px;border:1px solid var(--border);border-radius:50%;
  background:rgba(8,10,18,.72);color:var(--muted);cursor:pointer;transform:translateY(-50%);
}
.nav-arrow:hover{color:var(--teal);border-color:rgba(94,234,212,.35)}
.nav-prev{left:12px}.nav-next{right:12px}
.progress{position:fixed;left:0;bottom:0;height:3px;background:linear-gradient(90deg,var(--teal),var(--gold),var(--violet));transition:width .25s;z-index:30}
.counter{position:fixed;right:20px;bottom:14px;z-index:30;color:var(--muted);font:700 .78rem 'Fira Code',monospace;direction:ltr;unicode-bidi:isolate}
.toc{
  display:none;position:fixed;inset:0;z-index:50;padding:78px 24px 36px;background:rgba(6,6,15,.96);backdrop-filter:blur(22px);overflow:auto;
}
.toc.open{display:block}.toc-inner{width:min(1100px,100%);margin:auto}
.toc-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.toc-head h2{font-size:1.8rem}.toc-close{border:0;background:none;color:var(--muted);font-size:1.7rem;cursor:pointer}
.toc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.toc-item{display:flex;gap:.7rem;padding:.75rem;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.035);color:var(--muted);cursor:pointer;text-align:left}
.toc-item:hover,.toc-item.section{color:var(--teal);border-color:rgba(94,234,212,.25)}
.toc-num{font-family:'Fira Code',monospace;color:var(--teal)}
[dir=rtl] .bullets li{padding-left:0;padding-right:1.45rem}
[dir=rtl] .bullets li::before{left:auto;right:0}
[dir=rtl] .note{border-left:1px solid rgba(94,234,212,.28);border-right:4px solid var(--teal)}
[dir=rtl] .lang-menu{right:auto;left:0}
@media(max-width:820px){
  :root{--content:calc(100vw - 36px);--pad-top:68px;--pad-bottom:58px;--body:1.02rem}
  .topbar{padding:0 10px;gap:.45rem}.deck-name{display:none}.topbar-home{font-size:.72rem}
  .toc-button{padding:.4rem .55rem}.slide{align-items:flex-start;padding:var(--pad-top) 18px var(--pad-bottom)}
  .slide-inner{gap:16px}.columns,.comparison,.metric-row{grid-template-columns:1fr}
  h1{font-size:2.5rem}.quote{font-size:1.65rem}
  .column{padding:16px}.note{padding:14px 16px}.code{padding:14px;font-size:.72rem}
  .nav-arrow{display:none}.toc-grid{grid-template-columns:1fr}.counter{right:12px;bottom:10px;font-size:.7rem}
}
@media(max-height:760px) and (min-width:821px){
  :root{--pad-top:62px;--pad-bottom:42px;--body:1rem}
  .slide-inner{gap:14px}.column{padding:16px}.note{padding:13px 17px}h1{font-size:3.35rem}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}