/* ==========================================================================
   TRACE — shared design system
   Dark motorsport telemetry theme. Used by every page on the site.
   ========================================================================== */

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

:root {
  /* surfaces */
  --bg:     #07080c;
  --bg-1:   #0d1017;
  --bg-2:   #141824;
  --bg-3:   #1b2130;
  --cbg:    #050609;

  /* lines */
  --line:   rgba(255,255,255,.08);
  --line-2: rgba(255,255,255,.16);

  /* accents */
  --orange:      #ff6a22;
  --orange-dim:  #c65217;
  --orange-glow: rgba(255,106,34,.35);

  --blue:      #4a7bb3;
  --blue-2:    #5fa6ff;
  --blue-glow: rgba(95,166,255,.28);

  --green:     #2ed99a;
  --green-glow:rgba(46,217,154,.28);

  --gold:      #f2bc3c;
  --gold-glow: rgba(242,188,60,.28);

  /* text */
  --txt: #f4f6fa;
  --mid: #99a6bd;
  --dim: #6e7f99;

  --radius: 3px;
  --font-display: 'Rajdhani', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
  --font-mono: 'Space Mono', monospace;
}

html { scroll-behavior: smooth; scrollbar-gutter: stable; scrollbar-width: thin; scrollbar-color: var(--blue) var(--bg-1); }

::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg-1); }
::-webkit-scrollbar-thumb { background: var(--blue); border-radius: 6px; border: 2px solid var(--bg-1); }
::-webkit-scrollbar-thumb:hover { background: var(--orange); }

body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  opacity: 0;
  animation: page-fade-in .4s ease forwards;
}
@keyframes page-fade-in { to { opacity: 1; } }

/* ── SKIP LINK ── */
.skip-link {
  position: fixed; top: -100px; left: 12px; z-index: 200;
  background: var(--orange); color: #150900; text-decoration: none;
  padding: 10px 18px; border-radius: var(--radius);
  font-family: var(--font-display); font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase; font-size: .85rem;
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

/* ── SCREEN-READER-ONLY ── */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* faint telemetry-grid texture, sits behind all content */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  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: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 75%);
}

nav, .hero, .page-hdr, main, footer, section, .wrap { position: relative; z-index: 1; }

a { color: inherit; }
code {
  font-family: var(--font-mono); font-size: .85em;
  background: var(--cbg); border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2px 7px; color: var(--blue-2);
  overflow-wrap: anywhere;
}

::selection { background: var(--orange); color: #100b06; }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ── EYEBROW TAG ── */
.eyebrow {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-mono);
  font-size: .68rem; letter-spacing: .28em; text-transform: uppercase;
  color: var(--blue-2);
}
.eyebrow::before {
  content: ''; width: 7px; height: 7px; flex-shrink: 0;
  background: currentColor;
}
.eyebrow.dim    { color: var(--dim); }
.eyebrow.orange { color: var(--orange); }
.eyebrow.green  { color: var(--green); }
.eyebrow.gold   { color: var(--gold); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  border-radius: var(--radius);
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, opacity .2s ease;
  white-space: nowrap;
}
.btn-sm  { font-size: .88rem; padding: 10px 22px; }
.btn-md  { font-size: 1.05rem; padding: 15px 34px; }
.btn-lg  { font-size: 1.35rem; padding: 20px 56px; letter-spacing: .12em; }

.btn-primary { background: var(--orange); color: #150900; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px var(--orange-glow); }
.btn-primary:active { transform: translateY(0); }


.btn-outline {
  background: transparent; border-color: var(--line); color: var(--mid);
}
.btn-outline:hover { border-color: var(--blue-2); color: var(--txt); background: rgba(95,166,255,.06); }

.btn-arrow::after { content: '→'; margin-left: 2px; transition: transform .2s ease; }
.btn:hover .btn-arrow::after,
.btn.btn-arrow:hover::after { transform: translateX(3px); }

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 17px 52px;
  padding-top: max(17px, env(safe-area-inset-top));
  padding-left: max(52px, env(safe-area-inset-left));
  padding-right: max(52px, env(safe-area-inset-right));
  background: rgba(5,6,9,.88);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
}
nav::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: linear-gradient(90deg, var(--blue-2) 0%, transparent 35%, transparent 65%, var(--orange) 100%);
  opacity: .5;
}
.logo {
  font-family: var(--font-display);
  font-weight: 600; font-size: 1.1rem;
  letter-spacing: .12em; text-transform: uppercase;
  text-decoration: none; color: var(--txt);
  display: inline-flex; align-items: center; gap: 2px;
}
.logo span { color: var(--orange); }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
  text-decoration: none; color: var(--mid);
  font-family: var(--font-display);
  font-weight: 700; font-size: .86rem;
  letter-spacing: .1em; text-transform: uppercase;
  padding: 9px 16px; position: relative;
  transition: color .2s ease;
}
.nav-link::after {
  content: ''; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: var(--blue-2); transform: scaleX(0); transform-origin: left;
  transition: transform .2s ease;
}
.nav-link:hover { color: var(--txt); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link.active { color: var(--blue-2); }
.nav-link.active::after { transform: scaleX(1); }

.nav-back {
  text-decoration: none; color: var(--mid);
  font-family: var(--font-display);
  font-weight: 700; font-size: .86rem;
  letter-spacing: .1em; text-transform: uppercase;
  padding: 9px 16px; transition: color .2s ease;
}
.nav-back:hover { color: var(--txt); }

.nav-btn {
  font-family: var(--font-display); font-weight: 700;
  font-size: .86rem; letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; padding: 9px 22px; margin-left: 6px;
  border-radius: var(--radius); transition: opacity .2s ease, transform .15s ease;
}
.nav-btn.orange { background: var(--orange); color: #150900; }
.nav-btn.gold   { background: var(--gold);   color: #191204; }
.nav-btn:hover  { opacity: .85; }

/* ── MOBILE NAV ── */
.nav-burger {
  display: none; flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  width: 44px; height: 44px; background: none; border: none; cursor: pointer; padding: 0; z-index: 101;
}
.nav-burger span { display: block; width: 22px; height: 2px; background: var(--txt); transition: transform .2s ease, opacity .2s ease; }
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(80vw, 320px);
  background: var(--bg-1); border-left: 1px solid var(--line);
  padding: 100px 30px 32px; display: flex; flex-direction: column; gap: 2px;
  transform: translateX(100%); transition: transform .3s ease; z-index: 99;
  overflow-y: auto;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  text-decoration: none; color: var(--mid);
  font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 16px 2px; border-bottom: 1px solid var(--line);
  min-height: 44px; display: flex; align-items: center;
}
.mobile-menu a:hover { color: var(--txt); }
.mobile-menu a.active { color: var(--blue-2); }
.mobile-menu a.mm-btn.orange { color: var(--orange); }
.mobile-menu a.mm-btn.gold   { color: var(--gold); }
.menu-scrim {
  position: fixed; inset: 0; background: rgba(3,4,6,.6);
  opacity: 0; pointer-events: none; transition: opacity .3s ease; z-index: 98;
}
.menu-scrim.open { opacity: 1; pointer-events: auto; }

/* ── PAGE HEADER (about / features / setup) ── */
.page-hdr {
  padding: 152px 52px 56px;
  max-width: 940px; margin: 0 auto;
  border-bottom: 1px solid var(--line);
}
.page-hdr .eyebrow { margin-bottom: 18px; }
.page-hdr h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.6rem, 6.6vw, 5.2rem);
  text-transform: uppercase; line-height: .92;
  margin-bottom: 22px; letter-spacing: -.01em;
}
.page-hdr h1 em  { color: var(--orange); font-style: italic; }
.page-hdr h1 span{ color: var(--blue-2); }
.page-hdr p {
  font-size: 1rem; color: var(--mid);
  max-width: 600px; line-height: 1.8;
}

/* ── FOOTER ── */
footer {
  text-align: center; padding: 32px 20px;
  font-family: var(--font-mono);
  font-size: .58rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--dim); border-top: 1px solid var(--line);
  line-height: 1.9;
}
footer a { color: var(--dim); text-decoration: none; }
footer a:hover { color: var(--mid); }
footer img { border-radius: var(--radius); }

/* ── SCROLL REVEAL ── */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--bg-1); border: 1px solid var(--line-2);
  color: var(--txt); display: flex; align-items: center; justify-content: center;
  cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: opacity .25s ease, transform .25s ease, border-color .2s ease, background .2s ease;
  box-shadow: 0 12px 30px rgba(0,0,0,.4);
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { border-color: var(--blue-2); background: var(--bg-2); }
.back-to-top svg { width: 18px; height: 18px; }
@media(max-width:480px){ .back-to-top{ right:16px; bottom:16px; width:42px; height:42px; } }

@media (prefers-reduced-motion: reduce) {
  .reveal, html { transition: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  body { animation: none !important; opacity: 1 !important; }
  .back-to-top { transition: opacity .01s linear; }
}

/* ==========================================================================
   RESPONSIVE — shared breakpoints
   ========================================================================== */
@media (max-width: 780px) {
  nav { padding: 14px 20px; }
  .nav-link, .nav-links .nav-btn, .nav-back { display: none; }
  .nav-burger { display: flex; }
  .page-hdr { padding: 116px 20px 40px; }
  .btn-lg { font-size: 1.1rem; padding: 17px 20px; width: 100%; }
}

@media (max-width: 420px) {
  .logo { font-size: .98rem; }
  .page-hdr h1 { letter-spacing: -.005em; }
}