/* ==========================================================================
   layout.css — header, footer, page shells, grids
   ========================================================================== */

/* ---------------- Header ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  padding-top: clamp(0.75rem, 2vw, 1.25rem);
  transition: padding-top var(--transition-base);
}

.site-header.is-scrolled {
  padding-top: 0.5rem;
}

.header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.7rem 0.75rem 0.7rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(10, 16, 13, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  transition:
    padding var(--transition-base),
    background var(--transition-base),
    border-color var(--transition-base);
}

.site-header.is-scrolled .header__inner {
  padding-block: 0.45rem;
  background: rgba(5, 8, 7, 0.88);
  border-color: var(--color-border-strong);
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.16em;
  color: var(--color-text);
  min-width: 0;
}

.logo__mark {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.logo__mark circle,
.logo__mark path {
  transition: all var(--transition-base);
}

.logo:hover .logo__dot {
  fill: var(--color-pink);
}

/* Desktop nav */
.nav-desktop {
  display: none;
}

.nav-desktop ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.2vw, 2rem);
  list-style: none;
}

.nav-link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-2);
  padding-block: 0.35rem;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-green);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link[aria-current="page"]::after {
  background: var(--gradient-brand);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-self: end;
}

.header__cta {
  display: none !important;
}

/* Hamburger */
.hamburger {
  position: relative;
  width: 46px;
  height: 46px;
  min-height: 46px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.hamburger:hover {
  border-color: var(--color-border-green);
  background: var(--color-surface-hover);
}

.hamburger__box {
  position: relative;
  width: 19px;
  height: 12px;
}

.hamburger__box span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition:
    transform var(--transition-base),
    opacity 160ms linear,
    width var(--transition-base);
}

.hamburger__box span:nth-child(1) {
  top: 0;
}
.hamburger__box span:nth-child(2) {
  top: 5.25px;
  width: 72%;
}
.hamburger__box span:nth-child(3) {
  top: 10.5px;
}

.hamburger[aria-expanded="true"] .hamburger__box span:nth-child(1) {
  transform: translateY(5.25px) rotate(45deg);
}
.hamburger[aria-expanded="true"] .hamburger__box span:nth-child(2) {
  opacity: 0;
  width: 0;
}
.hamburger[aria-expanded="true"] .hamburger__box span:nth-child(3) {
  transform: translateY(-5.25px) rotate(-45deg);
}

/* ---------------- Mobile overlay menu ---------------- */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6.5rem var(--container-pad) 2.5rem;
  clip-path: circle(0% at calc(100% - 46px) 46px);
  transition: clip-path 620ms var(--ease-out);
  visibility: hidden;
  overflow-y: auto;
}

.nav-overlay.is-open {
  clip-path: circle(150% at calc(100% - 46px) 46px);
  visibility: visible;
}

.nav-overlay__close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 46px;
  height: 46px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background: var(--color-surface);
  color: var(--color-text);
  z-index: 10;
  transition: all var(--transition-fast);
}

.nav-overlay__close:hover {
  border-color: var(--color-border-pink);
  background: var(--color-surface-hover);
  color: var(--color-pink-soft);
}

.nav-overlay__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
  opacity: 0;
  transition: opacity 700ms var(--ease-out);
}

.nav-overlay.is-open .nav-overlay__glow {
  opacity: 1;
}

.nav-overlay__glow--green {
  width: 300px;
  height: 300px;
  background: rgba(57, 255, 136, 0.16);
  top: -60px;
  left: -80px;
  animation: drift-a 14s ease-in-out infinite;
}

.nav-overlay__glow--pink {
  width: 260px;
  height: 260px;
  background: rgba(255, 60, 172, 0.14);
  bottom: -70px;
  right: -60px;
  animation: drift-b 17s ease-in-out infinite;
}

.nav-overlay__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  position: relative;
}

.nav-overlay__list li {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 420ms var(--ease-out),
    transform 480ms var(--ease-out);
}

.nav-overlay.is-open .nav-overlay__list li {
  opacity: 1;
  transform: translateY(0);
}

.nav-overlay.is-open .nav-overlay__list li:nth-child(1) { transition-delay: 180ms; }
.nav-overlay.is-open .nav-overlay__list li:nth-child(2) { transition-delay: 240ms; }
.nav-overlay.is-open .nav-overlay__list li:nth-child(3) { transition-delay: 300ms; }
.nav-overlay.is-open .nav-overlay__list li:nth-child(4) { transition-delay: 360ms; }
.nav-overlay.is-open .nav-overlay__list li:nth-child(5) { transition-delay: 420ms; }

.nav-overlay__link {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding-block: 0.5rem;
  font-size: clamp(2rem, 11vw, 3.2rem);
  font-weight: 800;
  letter-spacing: var(--tracking-display);
  color: var(--color-text);
  line-height: 1.12;
}

.nav-overlay__link span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

.nav-overlay__link[aria-current="page"] {
  color: var(--color-green);
}

.nav-overlay__link:active span,
.nav-overlay__link[aria-current="page"] span {
  color: var(--color-pink-soft);
}

.nav-overlay__footer {
  margin-top: var(--space-xl);
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 420ms var(--ease-out),
    transform 480ms var(--ease-out);
  transition-delay: 480ms;
}

.nav-overlay.is-open .nav-overlay__footer {
  opacity: 1;
  transform: translateY(0);
}

.nav-overlay__meta {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-muted);
}

body.is-locked {
  overflow: hidden;
}

/* ---------------- Page hero shell ---------------- */
.page-hero {
  padding-top: clamp(4rem, 11vw, 8rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  position: relative;
}

.page-hero__inner {
  max-width: 22ch;
}

.page-hero h1 {
  margin-bottom: var(--space-md);
}

.page-hero .lead {
  max-width: 54ch;
}

.page-hero__inner {
  max-width: none;
}

/* ---------------- Grids ---------------- */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

.split {
  display: grid;
  gap: var(--space-xl);
  align-items: center;
}

/* ---------------- Footer ---------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-2);
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-lg);
  margin-top: auto;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.footer__brand p {
  margin-top: var(--space-sm);
  color: var(--color-text-2);
  max-width: 34ch;
  font-size: 0.94rem;
}

.footer__col h2 {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 400;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.footer__col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer__col a,
.footer__col span {
  font-size: 0.94rem;
  color: var(--color-text-2);
  transition: color var(--transition-fast);
}

.footer__col a:hover {
  color: var(--color-green);
}

.footer__bottom {
  margin-top: var(--space-2xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-small);
  color: var(--color-muted);
}

.footer__legal {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer__legal a:hover {
  color: var(--color-text);
}

/* ---------------- Scroll progress ---------------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--gradient-brand);
  z-index: var(--z-loader);
  pointer-events: none;
}