/* ============================================================
   SHARKLABS — production design system
   Graphite world · Satoshi / Inter / Geist Mono · Azure <5%
   ============================================================ */

:root {
  /* Canvas + elevation */
  --bg: #07090C;
  --s1: #0D1015;
  --s2: #10141A;
  --s3: #12161C;

  /* Text hierarchy */
  --tx: #F2F4F8;
  --tx2: #9BA3AF;
  --tx3: #6B7482; /* a11y: 5.4:1 on #07090C */

  /* Hairlines */
  --bd1: rgba(255, 255, 255, 0.06);
  --bd2: rgba(255, 255, 255, 0.08);
  --bd3: rgba(255, 255, 255, 0.10);

  /* Signal */
  --ac: #4D9FFF;
  --ac-soft: #8FCBFF;

  /* Radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  /* Type */
  --sans: 'Satoshi', 'Inter', system-ui, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'Cascadia Mono', monospace;
  --body: 'Inter', system-ui, sans-serif;

  --pad-x: clamp(22px, 5vw, 80px);
  --nav-h: 72px;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--tx);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

::selection { background: rgba(77, 159, 255, 0.28); color: #fff; }

:focus-visible {
  outline: 2px solid var(--ac);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed; top: -48px; left: 16px; z-index: 200;
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  background: var(--s2); color: var(--tx); border: 1px solid var(--bd3);
  padding: 10px 16px; border-radius: var(--r-sm);
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

/* ------------------------------------------------ typography */

.display {
  font-family: var(--sans);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 0.94;
  letter-spacing: -0.02em;
}
.h-sec {
  font-family: var(--sans);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.02;
  letter-spacing: -0.015em;
  font-size: clamp(34px, 5vw, 68px);
}
.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--tx3);
  display: flex;
  align-items: center;
  gap: 14px;
  text-transform: uppercase;
}
.kicker::before { content: ''; width: 36px; height: 1px; background: var(--ac); opacity: .8; flex: none; }
.lede {
  color: var(--tx2);
  font-size: clamp(14.5px, 1.25vw, 17px);
  line-height: 1.9;
  max-width: 52ch;
}
.lede b, .body-copy b { color: var(--tx); font-weight: 550; }
.body-copy { color: var(--tx2); line-height: 1.85; }
.mono-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--tx3);
  text-transform: uppercase;
}
.grad-text {
  color: transparent;
  background: linear-gradient(180deg, #FFFFFF 10%, #B9C3D2 55%, #6E7B8F 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* ------------------------------------------------ nav */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad-x);
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: height .25s ease, background-color .25s ease, border-color .25s ease;
}
.nav.is-scrolled {
  height: 58px;
  background: rgba(7, 9, 12, 0.78);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--bd1);
}
.wordmark {
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: 0.16em;
  font-size: 13px;
  color: var(--tx);
}
.wordmark .ac { color: var(--ac); }
.nav-links { display: flex; gap: 34px; align-items: center; }
.nav-links a {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--tx2);
  position: relative;
  padding: 6px 0;
  transition: color .2s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--ac);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s cubic-bezier(.3, .7, .3, 1);
}
.nav-links a:hover { color: var(--tx); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a[aria-current="page"] { color: var(--tx); }
.nav-links a[aria-current="page"]::after { transform: scaleX(1); }

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  padding: 8px;
  border: 1px solid var(--bd2);
  border-radius: var(--r-sm);
}
.nav-burger span {
  display: block; height: 1px; width: 100%;
  background: var(--tx2);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-3px) rotate(-45deg); }

.nav-sheet {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  z-index: 79;
  background: rgba(7, 9, 12, 0.97);
  border-bottom: 1px solid var(--bd2);
  padding: 18px var(--pad-x) 26px;
  flex-direction: column;
  gap: 4px;
}
.nav-sheet a {
  font-family: var(--sans);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--tx2);
  padding: 12px 0;
  border-bottom: 1px solid var(--bd1);
}
.nav-sheet a[aria-current="page"] { color: var(--tx); }
.nav-sheet a:hover { color: var(--tx); }
.nav-sheet.open { display: flex; }

@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
}

/* ------------------------------------------------ buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--body);
  font-size: 13px;
  font-weight: 550;
  letter-spacing: 0.06em;
  padding: 13px 22px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .22s cubic-bezier(.3, .7, .3, 1);
  white-space: nowrap;
}
.btn .arr { transition: transform .22s cubic-bezier(.3, .7, .3, 1); display: inline-block; }
.btn:hover .arr { transform: translateX(3px); }

.btn-solid { background: var(--ac); color: #05070A; }
.btn-solid:hover { background: #6FB2FF; }

.btn-ghost { border-color: var(--bd3); color: var(--tx); background: transparent; }
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.22); background: rgba(255, 255, 255, 0.03); }

.btn-text { padding: 13px 2px; color: var(--tx2); letter-spacing: 0.08em; }
.btn-text:hover { color: var(--tx); }
.btn-text:hover .arr { transform: translateX(4px); }

/* ------------------------------------------------ layout scaffolding */

.wrap { max-width: 1280px; margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }
.wrap-wide { max-width: 1440px; margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }

.section { padding: clamp(90px, 14vh, 160px) 0; border-bottom: 1px solid var(--bd1); position: relative; }
.section-quiet { padding: clamp(70px, 10vh, 120px) 0; border-bottom: 1px solid var(--bd1); }

.sec-head { display: flex; flex-direction: column; gap: 22px; margin-bottom: clamp(40px, 6vh, 72px); }
.sec-head .lede { margin-top: -8px; }

/* registration-mark separator — the site's quiet motif */
.sep {
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.14);
  padding: 6px 0;
  user-select: none;
}
.sep::before { content: '+'; }

/* ------------------------------------------------ frames for real UI */

.frame {
  border: 1px solid var(--bd3);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--s1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 44px 120px -60px rgba(0, 0, 0, 0.92);
}
.frame-cap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 13px 20px;
  border-bottom: 1px solid var(--bd2);
}
.frame-cap .id {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--tx3);
  display: flex;
  align-items: center;
  gap: 12px;
  text-transform: uppercase;
}
.frame-cap .id i {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--ac);
  box-shadow: 0 0 6px rgba(77, 159, 255, .65);
  flex: none;
}
.frame-cap .id b { color: var(--tx2); font-weight: 500; }
.frame-cap .fig { font-family: var(--mono); font-size: 10.5px; letter-spacing: .22em; color: var(--tx3); white-space: nowrap; }
.frame-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--bd1);
  background: rgba(11, 14, 19, .55);
}
.frame-foot span { font-family: var(--mono); font-size: 9.5px; letter-spacing: .18em; color: var(--tx3); text-transform: uppercase; }

.shot { overflow: hidden; background: var(--s2); }
.shot img { width: 100%; height: auto; display: block; }

/* ------------------------------------------------ reveal utility */

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .6, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: .08s; }
.reveal-d2 { transition-delay: .16s; }
.reveal-d3 { transition-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ------------------------------------------------ footer */

.site-footer {
  border-top: 1px solid var(--bd1);
  padding: clamp(60px, 9vh, 100px) 0 44px;
  background: linear-gradient(180deg, var(--bg), #05070A);
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: clamp(28px, 5vw, 72px);
  margin-bottom: clamp(48px, 8vh, 90px);
}
.foot-mark {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--tx);
  margin-bottom: 16px;
}
.foot-mark .ac { color: var(--ac); }
.foot-line { color: var(--tx3); font-size: 13.5px; line-height: 1.8; max-width: 34ch; }
.foot-col h3 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .24em;
  color: var(--tx3);
  text-transform: uppercase;
  margin-bottom: 18px;
  font-weight: 500;
}
.foot-col a {
  display: block;
  font-size: 13.5px;
  color: var(--tx2);
  padding: 5px 0;
  transition: color .2s;
}
.foot-col a:hover { color: var(--tx); }
.foot-base {
  border-top: 1px solid var(--bd1);
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.foot-base span { font-family: var(--mono); font-size: 10px; letter-spacing: .18em; color: var(--tx3); text-transform: uppercase; }
@media (max-width: 860px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .foot-grid { grid-template-columns: 1fr; }
  .foot-base { flex-direction: column; align-items: flex-start; }
}

/* ------------------------------------------------ a11y helpers */

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}