/* reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--nav-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, canvas { display: block; max-width: 100%; }
::selection { background: var(--accent); color: #0a0a0a; }

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

/* skip link */
.skip-link {
  position: absolute; left: -9999px; top: 8px; z-index: 100;
  background: var(--accent); color: #0a0a0a; padding: 8px 16px;
  font-family: var(--font-mono); font-size: 13px; border-radius: 4px;
}
.skip-link:focus { left: 16px; }

/* nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(16px, 5vw, 48px);
  transition: background-color 250ms ease, backdrop-filter 250ms ease, border-color 250ms ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 10, 10, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}
.nav-brand {
  font-family: var(--font-mono); font-size: 14px; font-weight: 500;
  letter-spacing: 0.02em; color: var(--text);
}
.nav-brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: clamp(12px, 2.5vw, 28px); align-items: center; }
.nav-links a {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--muted); transition: color 180ms var(--ease-out); position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-status {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 11px; color: var(--faint);
  text-transform: uppercase; letter-spacing: 0.1em;
}
.nav-status .led {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 8px var(--accent); animation: led-pulse 2.4s ease-in-out infinite;
}
@keyframes led-pulse { 0%,100%{opacity:1} 50%{opacity:0.35} }

/* mobile nav toggle (hamburger) */
.nav-toggle {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 10px;
  background: none; border: none; cursor: pointer; margin-left: auto;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; border-radius: 2px;
  background: var(--text);
  transition: transform 200ms var(--ease-out), opacity 150ms var(--ease-out);
}
#nav[data-menu-open] .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#nav[data-menu-open] .nav-toggle span:nth-child(2) { opacity: 0; }
#nav[data-menu-open] .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px clamp(16px, 5vw, 48px) 16px;
    background: rgba(10, 10, 10, 0.96);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  #nav[data-menu-open] .nav-links { display: flex; }
  .nav-links a {
    display: flex; align-items: center; min-height: 44px;
    font-size: 14px; border-bottom: 1px solid var(--border);
  }
  .nav-links a:last-child { border-bottom: none; }
  .nav-status { min-height: 44px; }
}

/* section rhythm */
main { display: block; }
.section {
  position: relative;
  padding: var(--section-pad) clamp(16px, 5vw, 48px);
}
.section-inner { max-width: var(--content-max); margin: 0 auto; width: 100%; }
.section--hero { padding: 0; min-height: 100vh; min-height: 100dvh; }

/* slash section headers */
.slash-header {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); margin-bottom: var(--s7);
  display: flex; align-items: center; gap: 10px;
}
.slash-header .slash { color: var(--accent); }
.slash-header .rule { flex: 1; height: 1px; background: var(--border); }

/* shared button / link primitives */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.02em;
  padding: 10px 18px; border: 1px solid var(--border); border-radius: 6px;
  color: var(--text); background: transparent;
  transition: border-color 150ms var(--ease-out), transform 150ms var(--ease-out), background-color 150ms var(--ease-out);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn--primary { border-color: var(--accent); color: var(--accent); }
.btn--primary:hover { background: rgba(214, 69, 69, 0.08); }

/* fade-in-on-scroll utility. Only hides once main.js confirms JS is live
   (html.js). Without JS the content stays fully visible (progressive enhancement). */
.js .reveal { opacity: 0; transform: translateY(8px); transition: opacity var(--fade-dur) var(--ease-out), transform var(--fade-dur) var(--ease-out); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .nav-status .led { animation: none; opacity: 1; }
}

/* footer / contact */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--s7) clamp(16px, 5vw, 48px) 0;
}
.footer-inner { max-width: var(--content-max); margin: 0 auto; width: 100%; }

/* two-column grid on an 8px baseline */
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: var(--s8);
  align-items: start;
  padding-bottom: var(--s9);
}

/* left column: lead + action */
.footer-lead { max-width: 30ch; }
.footer-title {
  font-size: clamp(32px, 4vw, 40px);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 var(--s2);
}
.footer-sub {
  font-size: 16px; line-height: 24px;
  color: var(--muted);
  margin: 0 0 var(--s4);
}
.footer-sub a {
  color: var(--text); text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: border-color 150ms var(--ease-out), color 150ms var(--ease-out);
}
.footer-sub a:hover { color: var(--accent); border-color: var(--accent); }

.footer-email {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px; line-height: 24px;
  color: var(--text);
  letter-spacing: 0.01em;
  user-select: all; -webkit-user-select: all;
  word-break: break-all;
  margin: 0 0 var(--s4);
}

.footer-email-btn { height: 48px; padding: 0 24px; }
.footer-arrow {
  font-family: var(--font-mono); font-size: 15px;
  transition: transform 150ms var(--ease-out);
}
.footer-email-btn:hover .footer-arrow { transform: translateX(3px); }

/* right column: tidy vertical link list */
.footer-links-nav { width: 100%; }
.footer-links {
  display: flex; flex-direction: column;
  margin: 0; padding: 6px 0 0; list-style: none;
}
.footer-links-item { margin: 0; }
.footer-link {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px;
  color: var(--text); text-decoration: none;
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--border);
  transition: color 150ms var(--ease-out);
}
.footer-links-item:first-child .footer-link { border-top: 1px solid var(--border); }
.footer-link-label { font-size: 15px; line-height: 24px; font-weight: 500; }
.footer-link-meta {
  font-family: var(--font-mono); font-size: 12px; line-height: 24px;
  color: var(--muted);
  transition: color 150ms var(--ease-out), transform 150ms var(--ease-out);
}
.footer-link:hover { color: var(--accent); }
.footer-link:hover .footer-link-meta { color: var(--accent); transform: translateX(3px); }

/* full-width bottom credit bar */
.footer-credit {
  border-top: 1px solid var(--border);
  margin: 0 calc(-1 * clamp(16px, 5vw, 48px));
  padding: var(--s5) clamp(16px, 5vw, 48px);
  background: var(--surface);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.footer-build {
  font-family: var(--font-mono);
  font-size: 12px; line-height: 16px; letter-spacing: 0.02em;
  color: var(--muted);
  margin: 0;
}
.footer-credit-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}

@media (max-width: 720px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--s6);
    padding-bottom: var(--s6);
  }
  .footer-lead { max-width: none; }
  .footer-links { padding-top: 0; }
  .footer-credit { flex-direction: column; align-items: flex-start; gap: var(--s2); }
}