/* ============================================================
   StudyLab — "Börja plugga" intro sequence
   Drop-in. Depends only on the tokens already in studylab.css
   (--bg, --text, --gold, --font-display, --font-mono).
   ============================================================ */

:root{
  --intro-flame:#ff6a00;
  --intro-flame-hot:#ffd166;
  --intro-flame-deep:#b41d00;
}

/* ---------- the extra bits inside the existing welcome notice ---------- */
.notice__audio{
  display:flex;align-items:center;gap:.7rem;
  margin-top:1.4rem;padding:.85rem 1rem;
  border:1px solid var(--border-strong);border-radius:10px;
  background:var(--bg-cell);cursor:pointer;
  transition:border-color .2s,background .2s;
}
.notice__audio:hover{border-color:var(--gold-soft);background:var(--bg-cell-hover)}
.notice__audio input{
  appearance:none;-webkit-appearance:none;
  width:38px;height:22px;border-radius:999px;flex-shrink:0;
  background:var(--border-strong);position:relative;cursor:pointer;
  transition:background .2s;
}
.notice__audio input::after{
  content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;
  background:var(--text-faint);transition:transform .2s,background .2s;
}
.notice__audio input:checked{background:var(--gold)}
.notice__audio input:checked::after{transform:translateX(16px);background:#0b0b0b}
.notice__audio .lbl{font-size:14px;color:var(--text)}
.notice__audio .hint{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--text-faint);margin-left:auto;
}
.btn--fire{
  background:linear-gradient(180deg,var(--intro-flame-hot),var(--intro-flame) 55%,var(--intro-flame-deep));
  color:#1a0500;font-weight:600;border:none;
  box-shadow:0 0 0 1px rgba(255,150,60,.5),0 8px 26px -8px rgba(255,90,0,.75);
}
.btn--fire:hover{transform:translateY(-1px);filter:brightness(1.08)}

/* ============================================================
   THE INTRO
   ============================================================ */
#sl-intro{
  position:fixed;inset:0;z-index:9999;
  background:#050505;overflow:hidden;
  opacity:0;visibility:hidden;
  contain:strict;
}
#sl-intro.live{opacity:1;visibility:visible}
#sl-intro.out{animation:slOut .85s cubic-bezier(.6,0,.3,1) forwards}
@keyframes slOut{
  0%{opacity:1;transform:scale(1);filter:blur(0)}
  35%{opacity:1;transform:scale(1.12);filter:blur(2px)}
  100%{opacity:0;transform:scale(1.5);filter:blur(18px)}
}
html.sl-locked,html.sl-locked body{overflow:hidden!important}

/* --- layers --- */
.sl-plate{
  position:absolute;inset:-6%;
  background:#050505 center/cover no-repeat;
  opacity:0;filter:grayscale(.35) contrast(1.25) brightness(.5);
  transform:scale(1.15);
}
#sl-intro.live .sl-plate{animation:plateIn 11s cubic-bezier(.2,.5,.3,1) forwards}
@keyframes plateIn{
  0%{opacity:0;transform:scale(1.28)}
  8%{opacity:.55}
  100%{opacity:.36;transform:scale(1.02)}
}
.sl-tint{
  position:absolute;inset:0;
  background:radial-gradient(ellipse 90% 70% at 50% 78%,rgba(255,90,0,.42),transparent 62%),
             radial-gradient(ellipse at center,transparent 28%,rgba(0,0,0,.9) 100%);
}
.sl-canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
#sl-fire{z-index:3}
#sl-fx{z-index:4}

.sl-strobe{position:absolute;inset:0;z-index:6;background:radial-gradient(circle at 50% 45%,#fff,#ffd9a0 55%,#ff8c2e);opacity:0;pointer-events:none;mix-blend-mode:screen}
.sl-scan{
  position:absolute;inset:0;z-index:14;pointer-events:none;opacity:.15;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,.9) 0 1px,transparent 1px 3px);
}

/* --- hard-edged flame border, top and bottom --- */
.sl-border{
  position:absolute;left:0;right:0;height:clamp(58px,11vh,120px);z-index:8;
  background-repeat:repeat-x;background-size:auto 100%;
  filter:drop-shadow(0 0 22px rgba(255,90,0,.85));
  opacity:0;
}
.sl-border--b{bottom:-2px}
.sl-border--t{top:-2px;transform:scaleY(-1)}
#sl-intro.live .sl-border{animation:bordIn .55s .12s ease forwards,slide 5.5s linear infinite}
@keyframes bordIn{to{opacity:1}}
@keyframes slide{to{background-position-x:-1055px}}

/* --- text block --- */
.sl-stage{
  position:absolute;inset:0;z-index:12;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:.55rem;padding:8vh 4vw;text-align:center;pointer-events:none;
}
.sl-kicker{
  font-family:var(--font-mono),ui-monospace,monospace;
  font-size:clamp(11px,1.9vw,17px);letter-spacing:.55em;text-transform:uppercase;
  color:var(--gold,#cba75c);opacity:0;text-shadow:0 0 20px rgba(203,167,92,.8);
}
.sl-kicker.go{animation:kickIn .5s ease forwards}
@keyframes kickIn{from{opacity:0;letter-spacing:.9em}to{opacity:.95;letter-spacing:.42em}}

.sl-word{display:flex;justify-content:center;flex-wrap:wrap;line-height:1;margin-bottom:.1rem}
.sl-word span{
  display:inline-block;opacity:0;
  font-family:var(--font-display),Georgia,"Times New Roman",serif;
  font-weight:700;font-size:clamp(46px,12vw,146px);letter-spacing:-.03em;line-height:1;
  background:linear-gradient(180deg,#fff 0%,#ffe9b0 22%,var(--intro-flame-hot) 40%,
             var(--intro-flame) 62%,var(--intro-flame-deep) 84%,#4a0a00 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  -webkit-text-stroke:1.5px rgba(30,6,0,.85);
  filter:drop-shadow(0 0 34px rgba(255,110,0,.85));
  transform:translateY(-120vh) rotate(-18deg) scale(2.2);
}
.sl-word span.go{animation:slam .52s cubic-bezier(.2,1.65,.35,1) forwards}
@keyframes slam{
  0%{opacity:0;transform:translateY(-120vh) rotate(-18deg) scale(2.2)}
  62%{opacity:1;transform:translateY(12px) rotate(2.5deg) scale(.88)}
  80%{transform:translateY(-7px) rotate(-1.5deg) scale(1.06)}
  100%{opacity:1;transform:none}
}

.sl-logo{
  width:clamp(220px,44vw,560px);margin-top:.2rem;opacity:0;
  filter:drop-shadow(0 0 30px rgba(255,120,0,.9)) drop-shadow(0 0 70px rgba(203,167,92,.5));
}
.sl-logo.go{animation:logoIn .6s cubic-bezier(.2,1.6,.35,1) forwards,logoPulse 1.4s .6s ease-in-out infinite}
@keyframes logoIn{
  0%{opacity:0;transform:scale(3.2) rotate(9deg);filter:blur(14px)}
  70%{opacity:1;transform:scale(.93) rotate(-1.5deg);filter:blur(0)}
  100%{opacity:1;transform:none}
}
@keyframes logoPulse{50%{filter:drop-shadow(0 0 46px rgba(255,150,0,1)) drop-shadow(0 0 90px rgba(203,167,92,.7))}}

.sl-tag{
  margin-top:1.1rem;opacity:0;max-width:26ch;
  font-family:var(--font-display),Georgia,serif;font-style:italic;
  font-size:clamp(14px,2.4vw,26px);color:#fff;
  text-shadow:0 0 24px rgba(255,90,0,.95),0 2px 0 rgba(90,20,0,.9);
}
.sl-tag.go{animation:tagIn .5s cubic-bezier(.2,1.5,.4,1) forwards}
@keyframes tagIn{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}

/* --- the Corvette --- */
.sl-car{
  position:absolute;z-index:11;bottom:6vh;left:-46vw;
  width:clamp(300px,46vw,780px);opacity:0;pointer-events:none;
  filter:drop-shadow(0 26px 40px rgba(0,0,0,.95)) drop-shadow(0 0 60px rgba(255,90,0,.35));
}
.sl-car.go{animation:carIn 1.35s cubic-bezier(.15,.85,.25,1) forwards,carIdle 1.1s 1.35s ease-in-out infinite}
@keyframes carIn{
  0%{opacity:0;left:-52vw;transform:scale(.72) skewX(9deg)}
  12%{opacity:1}
  70%{left:6vw;transform:scale(1.04) skewX(-3deg)}
  100%{opacity:1;left:3vw;transform:scale(1) skewX(0)}
}
@keyframes carIdle{50%{transform:translateY(-7px) rotate(-.5deg)}}
.sl-headlight{
  position:absolute;z-index:10;bottom:16vh;left:14vw;width:min(64vw,900px);height:26vh;
  background:radial-gradient(ellipse at 0% 50%,rgba(255,255,255,.6),rgba(255,180,80,.22) 32%,transparent 68%);
  opacity:0;pointer-events:none;filter:blur(6px);
}
.sl-headlight.go{animation:beam 2.6s .9s ease-out forwards}
@keyframes beam{0%{opacity:0;transform:scaleX(.3)}18%{opacity:1}100%{opacity:.35;transform:scaleX(1)}}

/* --- taillights flashing in the deep background --- */
.sl-tail{
  position:absolute;z-index:5;top:16%;right:4%;width:min(38vw,520px);
  opacity:0;pointer-events:none;filter:blur(1px) drop-shadow(0 0 40px rgba(255,0,0,.9));
}
.sl-tail.go{animation:tailIn .6s ease forwards,tailFlick 1.7s .6s steps(1,end) infinite}
@keyframes tailIn{to{opacity:.85}}
@keyframes tailFlick{0%,58%{opacity:.85}60%,66%{opacity:.25}68%,100%{opacity:.85}}

/* --- rotating sticker ring --- */
.sl-ring{
  position:absolute;left:50%;top:50%;width:0;height:0;z-index:9;pointer-events:none;
  opacity:0;transition:opacity .7s ease;
  animation:spin 13s linear infinite;
}
.sl-ring.go{opacity:1}
@keyframes spin{to{transform:rotate(360deg)}}
.sl-orbit{
  position:absolute;transform:translate(-50%,-50%);
  animation:spinBack 13s linear infinite;
}
@keyframes spinBack{to{transform:translate(-50%,-50%) rotate(-360deg)}}
.sl-sticker{
  font-family:var(--font-mono),ui-monospace,monospace;
  font-size:clamp(9px,1.15vw,13px);font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  white-space:nowrap;padding:.5rem .75rem;border-radius:4px;
  color:#fff;background:rgba(10,10,10,.86);
  border:1px solid var(--gold,#cba75c);
  box-shadow:0 0 24px rgba(0,0,0,.9),0 0 18px rgba(203,167,92,.35);
  animation:wob 1.3s ease-in-out infinite;
}
.sl-sticker--hot{background:linear-gradient(180deg,var(--intro-flame),var(--intro-flame-deep));
  border-color:#ffd9a0;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.6)}
@keyframes wob{50%{transform:scale(1.13) rotate(5deg)}}
.sl-can{
  width:clamp(56px,7vw,104px);
  filter:drop-shadow(0 0 22px rgba(255,255,255,.55)) drop-shadow(0 8px 18px rgba(0,0,0,.9));
  animation:canSpin 2.6s linear infinite;
}
@keyframes canSpin{
  0%{transform:rotate(-14deg) scaleX(1)}
  50%{transform:rotate(14deg) scaleX(.55)}
  100%{transform:rotate(-14deg) scaleX(1)}
}

/* --- bouncing meme cards --- */
.sl-meme{
  position:absolute;top:0;left:0;z-index:10;
  width:clamp(88px,11vw,172px);opacity:0;pointer-events:none;
  will-change:transform;
  filter:drop-shadow(0 0 20px rgba(255,120,0,.6)) drop-shadow(0 10px 26px rgba(0,0,0,.9));
  transition:opacity .4s ease;
}
.sl-meme.go{opacity:1}
@media (max-width:640px){.sl-meme{width:clamp(78px,26vw,120px)}}

/* --- chrome --- */
.sl-skip{
  position:absolute;right:clamp(12px,2.5vw,26px);top:clamp(12px,2.5vw,26px);z-index:40;
  pointer-events:auto;cursor:pointer;
  font-family:var(--font-mono),ui-monospace,monospace;
  font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:#fff;background:rgba(0,0,0,.6);
  border:1px solid rgba(255,255,255,.3);border-radius:999px;
  padding:.7rem 1.1rem;transition:background .2s,color .2s,border-color .2s;
}
.sl-skip:hover{background:#fff;color:#000;border-color:#fff}
.sl-bar{
  position:absolute;left:0;bottom:0;height:2px;z-index:41;width:0%;
  background:linear-gradient(90deg,var(--gold,#cba75c),var(--intro-flame-hot),var(--intro-flame));
  box-shadow:0 0 14px rgba(255,120,0,.9);
}

.sl-shake{animation:shk .11s infinite}
@keyframes shk{
  0%{transform:translate(0,0)}25%{transform:translate(-5px,3px)}
  50%{transform:translate(4px,-5px)}75%{transform:translate(-3px,-2px)}
  100%{transform:translate(5px,2px)}
}

@media (max-width:640px){
  .sl-car{bottom:4vh;width:80vw;left:-80vw}
  @keyframes carIn{0%{opacity:0;left:-85vw;transform:scale(.7)}12%{opacity:1}
    70%{left:14vw;transform:scale(1.04)}100%{opacity:1;left:10vw;transform:none}}
  .sl-tail{display:none}
}

/* Respect the OS setting: no strobe, no shake, no 10 seconds of noise. */
@media (prefers-reduced-motion:reduce){
  #sl-intro{display:none!important}
}