/* ═══════════════════════════════════════════
   Layout — nav, hero, sections, footer
   ═══════════════════════════════════════════ */

/* ─── Navigation ─── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: color-mix(in srgb, var(--bg) 45%, transparent);
  backdrop-filter: blur(1rem);
  -webkit-backdrop-filter: blur(1rem);
  z-index: 100;
  border-bottom: 1px solid var(--bg-border);
  transform: translateY(0);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav--hidden {
  transform: translateY(-100%);
  opacity: 0;
}

/* Scroll progress line along the bottom edge */
.nav__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--aurora-2));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* Logo — mono, glows on hover, scrambles via js/nav.js */
.nav__logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--accent);
  position: relative;
  display: inline-block;
  overflow: hidden;
  padding: 0.25rem 0.625rem;
  margin: -0.25rem -0.625rem;
  transition: text-shadow 0.3s ease;
}

.nav__logo:hover,
.nav__logo:focus-visible {
  text-shadow:
    0 0 0.75rem var(--accent-glow),
    0 0 1.75rem var(--accent-glow);
}

/* Links — dual-label flip on hover */

.nav__links {
  list-style: none;
  display: flex;
  gap: 1.625rem;
}

.nav__link {
  position: relative;
  display: inline-block;
  overflow: hidden;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-muted);
  white-space: nowrap;
  transform: scale(1) rotate(0deg);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav__link:hover,
.nav__link:focus-visible {
  transform: scale(1.12) rotate(-2.5deg);
}

.nav__link-label {
  display: block;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Accent duplicate parked below the clip, flips up on hover */
.nav__link::after {
  content: attr(data-text);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  color: var(--accent);
  transform: translateY(105%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

.nav__link:hover .nav__link-label,
.nav__link:focus-visible .nav__link-label {
  transform: translateY(-105%);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
  transform: translateY(0);
}

/* Active section — accent color + underline sweep */
.nav__link--active {
  color: var(--accent);
}

.nav__link--active::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform-origin: 0 50%;
  animation: growX 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ─── Noise overlay ─── */

#noise {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  width: 100%;
  height: 100%;
  opacity: 0.4;
}

/* ─── Hero ─── */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: 0 1.5rem;
}

.hero__content {
  text-align: center;
}

.hero__name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1.25rem;
}

.hero__tagline {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  margin-bottom: 1rem;
}

.tagline-prompt {
  color: var(--accent);
  font-weight: 500;
}

.tagline-text {
  color: var(--text-primary);
}

.tagline-cursor {
  color: var(--accent);
  font-weight: 500;
}

.hero__sub {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  color: var(--text-muted);
  opacity: 0.5;
}

.hero__scroll svg {
  width: 1.25rem;
  height: 1.75rem;
}

/* ─── Generic sections ─── */

.section {
  padding: var(--section-gap) 1.5rem;
  position: relative;
  z-index: 1;
}

.section--last {
  padding-bottom: 3.75rem;
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
  display: inline-block;
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.section__body {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 36.25rem;
}

.section__body p + p {
  margin-top: 1rem;
}

/* ─── Footer ─── */

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

.footer__text {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}