/* Kyalami Exhausts: shared layout, hero engine styling, and motion system. */

*{margin:0;padding:0;box-sizing:border-box}
html,body{overflow-x:hidden;overflow-x:clip;background:var(--canvas);color:var(--text-primary)}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;position:relative}

h1,h2,h3{font-family:var(--font-display);font-weight:700;letter-spacing:.01em;line-height:1.05;text-transform:uppercase}
h1{font-size:clamp(34px,4.8vw,66px)}
h2{font-size:clamp(26px,3vw,42px)}
h3{font-size:clamp(17px,1.5vw,21px);letter-spacing:.03em}
p{max-width:58ch;color:var(--text-secondary)}
a{color:inherit}
img,svg,video{max-width:100%;display:block}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--ink);padding:10px 18px;z-index:200}
.skip:focus{left:0}

.wrap{max-width:1240px;margin:0 auto;padding-left:5vw;padding-right:5vw}
section{padding:clamp(64px,9vw,120px) 0;position:relative}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12.5px;
  letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent)}

/* ---------- the weld-spine: the site's one signature element ---------- */
/* a persistent line down the left margin, its draw-length tied to whole-page scroll progress */
#spine{position:fixed;left:22px;top:0;width:2px;height:100vh;z-index:40;pointer-events:none;display:block}
@media (max-width:780px){#spine{left:10px}}
#spine .track{stroke:var(--line);stroke-width:2}
#spine .draw{stroke:var(--accent);stroke-width:2;stroke-dasharray:1 1;filter:drop-shadow(0 0 4px var(--accent-muted))}
#spine .head{fill:var(--accent);filter:drop-shadow(0 0 6px var(--accent))}

/* ---------- nav ---------- */
.site-nav{position:fixed;top:0;left:0;right:0;z-index:60;display:flex;align-items:center;gap:30px;
  padding:0 5vw 0 calc(5vw + 20px);height:72px;background:rgba(10,11,13,.7);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.site-nav__brand{margin-right:auto;font-family:var(--font-display);font-weight:700;font-size:19px;
  letter-spacing:.06em;text-transform:uppercase;text-decoration:none;color:var(--text-primary)}
.site-nav__brand b{color:var(--accent)}
.site-nav__menu{display:flex;align-items:center;gap:26px;list-style:none}
.site-nav__menu a{text-decoration:none;font-size:14px;font-weight:500;color:var(--text-secondary);
  transition:color .25s var(--ease)}
.site-nav__menu a:hover{color:var(--text-primary)}
.site-nav__cta{color:var(--ink) !important;font-family:var(--font-mono) !important;font-weight:600 !important;
  font-size:12.5px !important;letter-spacing:.08em;text-transform:uppercase;background:var(--accent);
  padding:9px 16px;transition:background .25s var(--ease),transform .25s var(--ease)}
.site-nav__cta:hover{background:var(--accent-hover);transform:translateY(-1px)}
.site-nav__toggle{display:none;background:none;border:0;width:44px;height:44px;cursor:pointer;
  flex-direction:column;justify-content:center;align-items:center;gap:5px}
.site-nav__toggle span{display:block;width:22px;height:2px;background:var(--text-primary)}
@media (max-width:880px){
  .site-nav__toggle{display:flex}
  .site-nav__menu{position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--panel);border-bottom:1px solid var(--line);max-height:0;overflow:hidden;
    transition:max-height .4s var(--ease)}
  .site-nav__menu.open{max-height:70vh}
  .site-nav__menu li{border-top:1px solid var(--line)}
  .site-nav__menu a{display:block;padding:16px 6vw}
  .site-nav__cta{margin:14px 6vw}
}

/* ---------- buttons ---------- */
.btn{display:inline-block;background:var(--accent);color:var(--ink);text-decoration:none;
  font-family:var(--font-mono);font-weight:600;font-size:13px;letter-spacing:.06em;text-transform:uppercase;
  padding:16px 30px;border:0;cursor:pointer;transition:transform .3s var(--ease),background .3s var(--ease);
  text-shadow:none}
.btn:hover{background:var(--accent-hover);transform:translateY(-2px)}
.btn:focus-visible{outline:2px solid var(--text-primary);outline-offset:3px}
.btn.ghost{background:transparent;color:var(--text-primary);box-shadow:inset 0 0 0 1.5px var(--line-strong)}
.btn.ghost:hover{box-shadow:inset 0 0 0 1.5px var(--accent);color:var(--accent)}
@media (pointer:coarse){.btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center}}

/* ---------- entrances (choreography, retired after play) ---------- */
.rv .part{opacity:0;transform:translate3d(0,20px,0)}
.rv.in .part{opacity:1;transform:translate3d(0,0,0);transition:opacity .7s var(--ease-out),transform .7s var(--ease-out)}
.rv.in .part:nth-child(2){transition-delay:.09s}
.rv.in .part:nth-child(3){transition-delay:.18s}
.rv.in .part:nth-child(4){transition-delay:.27s}
.rv.in .part:nth-child(5){transition-delay:.36s}
.rv.in .part:nth-child(6){transition-delay:.45s}
.rv.done .part{transition-delay:0s !important}
.rv.in:not(.done) .part{will-change:transform,opacity}

@media (prefers-reduced-motion:reduce){
  .rv .part{opacity:1 !important;transform:none !important;transition:none !important}
}

/* ---------- garage grid (car marques) ---------- */
.garage{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:44px}
.garage__cell{flex:1 1 150px;background:var(--canvas);padding:26px 14px;text-align:center;font-family:var(--font-mono);
  font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--text-secondary);
  transition:color .25s var(--ease),background .25s var(--ease)}
.garage__cell:hover{color:var(--accent);background:var(--panel)}

/* ---------- process / craft steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-top:48px}
.step{border-top:2px solid var(--line-strong);padding-top:18px;transition:border-color .3s var(--ease)}
.step:hover{border-top-color:var(--accent)}
.step__num{font-family:var(--font-mono);font-size:12.5px;color:var(--accent);letter-spacing:.08em}
.step h3{margin-top:10px;color:var(--text-primary)}
.step p{margin-top:8px;font-size:15px}
@media (max-width:880px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.steps{grid-template-columns:1fr}}

/* ---------- craft split: interactive moment + still ---------- */
.craft-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,64px);align-items:stretch;margin-top:48px}
.hold-widget{display:flex;flex-direction:column;justify-content:center}
@media (max-width:900px){.craft-grid{grid-template-columns:1fr}}
.craft-still{position:relative;border-radius:4px;overflow:hidden;border:1px solid var(--line);
  box-shadow:0 30px 70px rgba(0,0,0,.5)}
.craft-still img{width:100%;height:100%;object-fit:cover;display:block}

.hold-widget{background:radial-gradient(ellipse 120% 90% at 50% 0%,rgba(247,134,56,.07),transparent 60%),var(--panel);
  border:1px solid var(--line);border-radius:4px;padding:32px 28px;text-align:center;overflow:hidden}

.valve-scene{position:relative;margin-bottom:20px}
.valve-readout{position:relative;display:flex;align-items:baseline;justify-content:center;gap:6px;margin-bottom:10px}
.valve-db{font-family:var(--font-display);font-size:2.5rem;font-weight:700;line-height:1;color:var(--text-primary)}
.valve-db-unit{font-family:var(--font-mono);font-size:.82rem;color:var(--text-tertiary);align-self:flex-end;margin-bottom:5px}
.valve-state{position:absolute;right:0;bottom:4px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;
  color:var(--text-tertiary);transition:color .3s var(--ease)}

.valve-svg{width:100%;height:auto;display:block;overflow:visible}
.wave-baseline{stroke:var(--line);stroke-width:1}
.wave-path{stroke:var(--accent);stroke-width:2.4;fill:none;stroke-linejoin:round;stroke-linecap:round;
  filter:drop-shadow(0 0 4px var(--accent-muted))}

.hold-btn{width:96px;height:96px;border-radius:50%;border:1.5px solid var(--line-strong);background:var(--panel-alt);
  color:var(--text-primary);font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  cursor:pointer;margin:0 auto;display:flex;align-items:center;justify-content:center;position:relative;isolation:isolate;
  transition:border-color .3s var(--ease),color .3s var(--ease),box-shadow .3s var(--ease);
  -webkit-tap-highlight-color:transparent}
.hold-btn__ring{position:absolute;inset:-10px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,var(--accent-muted) 0%,transparent 68%);
  opacity:.5;animation:idle-breathe 4.5s ease-in-out infinite -1.4s}
@keyframes idle-breathe{0%,100%{transform:scale(.92);opacity:.4}50%{transform:scale(1.08);opacity:.75}}
.hold-btn::before{content:"";position:absolute;inset:-1.5px;border-radius:50%;z-index:-1;
  background:conic-gradient(var(--accent) calc(var(--hp,0) * 1%),transparent 0);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 4px),#000 calc(100% - 3px));
  mask:radial-gradient(farthest-side,transparent calc(100% - 4px),#000 calc(100% - 3px))}
.hold-btn[data-active="true"]{box-shadow:0 0 26px var(--accent-muted)}
.hold-btn:hover,.hold-btn:focus-visible{border-color:var(--accent);color:var(--accent)}
.hold-widget p.caption{margin-top:16px;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--text-tertiary)}

@media (prefers-reduced-motion:reduce){
  .hold-btn__ring{animation:none;opacity:.5}
  .hold-btn::before{display:none}
}

/* ---------- FAQ ---------- */
.faq{margin-top:44px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:20px 0}
.faq summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;
  gap:20px;font-family:var(--font-display);font-weight:600;font-size:16px;letter-spacing:.01em;
  color:var(--text-primary);text-transform:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-mono);font-size:20px;color:var(--accent);
  transition:transform .3s var(--ease);flex:none}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{margin-top:14px;font-size:15px}

/* ---------- final CTA ---------- */
.cta-band{background:var(--panel);border:1px solid var(--line);border-radius:4px;
  padding:clamp(36px,6vw,64px);text-align:center;margin-top:16px}
.cta-band p{max-width:52ch;margin:14px auto 0}
.cta-band .btn{margin-top:28px}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:44px 5vw 44px calc(5vw + 20px);display:flex;flex-wrap:wrap;
  gap:20px;align-items:center;justify-content:space-between;font-size:13.5px;color:var(--text-tertiary)}
.site-footer a{color:var(--text-secondary);text-decoration:none}
.site-footer a:hover{color:var(--accent)}
.site-footer__links{display:flex;gap:20px;flex-wrap:wrap}

@media (max-width:780px){
  .wrap{padding-left:calc(5vw + 12px)}
  .site-footer{padding-left:calc(5vw + 12px)}
}