:root {
  --bg: #0a0a0b;
  --bg-raised: #151517;
  --ink: #f4f4f5;
  --ink-dim: #9a9a9f;
  --ink-faint: #505055;
  --line: #262629;
  --accent: #ffffff;
  --accent-dim: #6e6e73;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Faint blueprint grid, fixed to viewport */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 0%, transparent 75%);
}

nav {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(8px);
  padding: 1.1rem 0;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid var(--line);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  transition: top 0.3s ease-in-out;
  box-sizing: border-box;
}

.logo {
  height: 34px;
  width: auto;
  transition: transform 0.4s ease;
}

.logo-link {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-mark path {
  stroke: var(--ink);
}

.section {
  min-height: 100vh;
  padding: 12vh 2rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Registration ticks in hero corners, technical-drawing style */
.main-header {
  text-align: center;
  align-items: center;
  justify-content: center;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
}

.tick {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--ink-faint);
  opacity: 0.6;
}
.tick.tl { top: 8vh; left: 2rem; border-right: none; border-bottom: none; }
.tick.tr { top: 8vh; right: 2rem; border-left: none; border-bottom: none; }
.tick.bl { bottom: 8vh; left: 2rem; border-right: none; border-top: none; }
.tick.br { bottom: 8vh; right: 2rem; border-left: none; border-top: none; }

.eyebrow {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--ink-faint);
  display: inline-block;
}

.main-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  letter-spacing: -0.02em;
  margin: 1.4rem 0 0.9rem;
  color: var(--ink);
}

.main-tagline {
  font-family: 'Space Grotesk', sans-serif;
  font-style: italic;
  font-weight: 400;
  font-size: 1.05rem;
  color: var(--ink-dim);
  letter-spacing: 0.01em;
  margin-bottom: 0;
}

.main-tagline span {
  color: var(--ink-faint);
  font-style: normal;
  margin-left: 0.6rem;
}

.gr {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  margin-bottom: 1.2rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h3.gr {
  font-size: 1.2rem;
  margin-top: 2rem;
  margin-bottom: 0.9rem;
  color: var(--ink-dim);
}

.s {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin-bottom: 1.1rem;
  max-width: 68ch;
}

.s a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-faint);
  transition: all 0.2s ease;
}

.s a:hover {
  color: var(--accent);
  border-bottom-color: var(--ink);
}

.rule {
  width: 100%;
  max-width: 68ch;
  height: 1px;
  background: var(--line);
  margin: 0.4rem 0 2rem;
}

.section {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.section.v {
  opacity: 1;
  transform: translateY(0);
}

footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 3rem 1.5rem 2.5rem;
  border-top: 1px solid var(--line);
}

.footer-legal {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.footer-legal a, .footer-legal button {
  color: var(--ink-dim);
  text-decoration: none;
  background: none;
  border: none;
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  padding: 0;
  transition: color 0.2s ease;
}

.footer-legal a:hover, .footer-legal button:hover {
  color: var(--ink);
}

.footer-legal .sep {
  color: var(--line);
}

.footer-copy {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

.footer-copy a {
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-faint);
  transition: all 0.2s ease;
}

.footer-copy a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* Redirect-warning modal, shown before sending visitors to an external GFM site */
#redirect-modal {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(5, 5, 6, 0.72);
  backdrop-filter: blur(3px);
  padding: 1.5rem;
}

#redirect-modal.visible {
  display: flex;
}

.redirect-card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2rem 2rem 1.6rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
}

.redirect-card p.eyebrow {
  justify-content: center;
  margin-bottom: 0.9rem;
}

.redirect-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  color: var(--ink);
  margin: 0 0 0.8rem;
}

.redirect-card p.detail {
  font-size: 0.9rem;
  color: var(--ink-dim);
  line-height: 1.6;
  margin: 0 0 1.5rem;
}

.redirect-card .redirect-target {
  color: var(--ink);
}

.redirect-count {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.4rem;
  color: var(--ink);
  margin-bottom: 1.5rem;
  font-variant-numeric: tabular-nums;
}

.redirect-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.redirect-actions button {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.6rem 1.1rem;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  transition: all 0.2s ease;
}

.redirect-actions button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0a0b;
}

.redirect-actions button.primary:hover {
  background: #d4d4d8;
}

.redirect-actions button:not(.primary):hover {
  border-color: var(--ink-faint);
  color: var(--ink);
}

#scroll-arrow {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  opacity: 1;
  user-select: none;
  z-index: 1000;
  transition: opacity 0.5s ease, transform 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  border-radius: 3px;
}

#scroll-arrow:hover {
  color: var(--ink);
  border-color: var(--ink-faint);
  transform: translateY(-2px);
}

#scroll-arrow svg {
  animation: arrowFloat 2s ease-in-out infinite;
}

@keyframes arrowFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(3px); }
}

/* Cookie consent banner */
#cookie-banner {
  position: fixed;
  left: 1.5rem;
  right: 1.5rem;
  bottom: 1.5rem;
  max-width: 640px;
  margin: 0 auto;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.4rem 1.5rem;
  z-index: 1200;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  transform: translateY(140%);
  transition: transform 0.5s cubic-bezier(.16,1,.3,1);
}

#cookie-banner.visible {
  transform: translateY(0);
}

#cookie-banner p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--ink-dim);
  margin: 0 0 1rem;
}

#cookie-banner a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-faint);
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.cookie-actions button {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.6rem 1.1rem;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  transition: all 0.2s ease;
}

.cookie-actions button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0a0b;
}

.cookie-actions button.primary:hover {
  background: #d4d4d8;
}

.cookie-actions button:not(.primary):hover {
  border-color: var(--ink-faint);
  color: var(--ink);
}

@media (max-width: 600px) {
  .section { padding: 9vh 1.4rem; }
  .tick { display: none; }
}