/* nav.css — site navigation styles */

:root {
  --nav-height: 92px;
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: var(--border-subtle) solid var(--color-border);
  transition:
    box-shadow var(--duration-fast) var(--ease-out);
}

.site-nav.is-scrolled {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(245, 245, 245, 0.85);
  box-shadow: 0 1px 12px rgba(28, 26, 24, 0.06);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-5) var(--page-margin);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: inline-grid;
  text-decoration: none;
  line-height: 1;
}

.logo-a,
.logo-s {
  grid-area: 1 / 1;
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 400;
  line-height: 1;
  mix-blend-mode: multiply;
  transition: color var(--duration-base) var(--ease-out);
  user-select: none;
}

.logo-a { color: var(--color-ruby); }
.logo-s { color: var(--color-cyan); }

.nav-logo:hover .logo-a { color: var(--color-cyan); }
.nav-logo:hover .logo-s { color: var(--color-ruby); }

.nav-links {
  list-style: none;
  display: flex;
  gap: var(--space-8);
  align-items: center;
}

.nav-links a,
.nav-work-toggle {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--text-body-lg);
  font-weight: 400;
  line-height: 1;
  color: var(--color-text);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: inline-block;
  transition:
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
}

.nav-links a:hover,
.nav-work-toggle:hover {
  color: var(--color-ruby);
  transform: translateX(6px);
}

.nav-links a::after,
.nav-work-toggle::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-cyan);
  border-radius: var(--radius-none);
  opacity: 0;
  transform: scaleX(0.6);
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.nav-links a.is-active,
.nav-work-toggle.is-active {
  color: var(--color-ruby);
}

.nav-links a.is-active::after,
.nav-work-toggle.is-active::after {
  opacity: 1;
  transform: scaleX(1);
}

/* ── Work panel ── */
.work-panel {
  position: fixed;
  top: var(--nav-height);
  right: 0;
  bottom: 0;
  width: 100%;
  background: var(--color-bg);
  z-index: 99;
  overflow-y: auto;
  transform: translateY(-100%);
  transition: transform 900ms var(--ease-out);
  padding: var(--space-16) 0;
}

.work-panel.is-open {
  transform: translateY(0);
}

/* Close button — desktop only */
.work-panel-close {
  display: none;
}

@media (min-width: 768px) {
  .work-panel-close {
    display: block;
    position: absolute;
    top: var(--space-16);
    right: max(var(--page-margin), calc((100% - var(--max-width)) / 2 + var(--page-margin)));
    width: 56px;
    height: 56px;
    background: var(--color-cyan);
    mix-blend-mode: multiply;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    color: #fff;
    transition: background var(--duration-fast) var(--ease-out);
  }

  .work-panel-close:hover {
    background: var(--color-ruby);
  }

  .work-panel-close::before,
  .work-panel-close::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 22px;
    height: 1.5px;
    background: currentColor;
    transition: transform 100ms var(--ease-out);
  }

  /* Parallel lines by default — cross into X when panel is open */
  .work-panel-close::before {
    transform: translate(-50%, -50%) rotate(0deg);
  }

  .work-panel-close::after {
    transform: translate(-50%, -50%) rotate(0deg);
  }

  .work-panel.is-open .work-panel-close::before {
    transform: translate(-50%, -50%) rotate(45deg);
  }

  .work-panel.is-open .work-panel-close::after {
    transform: translate(-50%, -50%) rotate(-45deg);
  }
}

.work-panel-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--page-margin);
}

.work-panel-list a {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: 400;
  color: var(--color-text);
  text-decoration: none;
  display: inline-block;
  transition:
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
}

.work-panel-list a:hover {
  color: var(--color-ruby);
  transform: translateX(6px);
}

/* ── Hamburger button ── */
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
}

.nav-burger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition:
    transform var(--duration-base) var(--ease-out),
    opacity var(--duration-base) var(--ease-out);
}

/* X state — lines cross at their shared midpoint (gap: 5px + line: 1.5px = 6.5px between centers / 2 = 3.25px) */
@media (prefers-reduced-motion: no-preference) {
  .nav-burger.is-open span:first-child {
    transform: translateY(3.25px) rotate(45deg);
  }
  .nav-burger.is-open span:last-child {
    transform: translateY(-3.25px) rotate(-45deg);
  }
}

/* ── Mobile menu overlay ── */
.nav-mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--color-bg);
  flex-direction: column;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
}

.nav-mobile-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav-mobile-inner {
  padding: calc(var(--nav-height) + var(--space-10)) var(--page-margin) var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

/* Primary links — Work, About, Contact */
.nav-mobile-primary {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.nav-mobile-primary > li {
  display: flex;
  flex-direction: column;
}

.nav-mobile-primary a,
.nav-mobile-work-trigger {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: 400;
  color: var(--color-text);
  text-decoration: none;
  text-align: left;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition:
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
}

.nav-mobile-primary a:hover,
.nav-mobile-work-trigger:hover {
  color: var(--color-ruby);
  transform: translateX(6px);
}

/* Chevron */
.nav-mobile-chevron {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-1px, -2px);
  transition: transform var(--duration-base) var(--ease-out);
  flex-shrink: 0;
}

.nav-mobile-work-trigger.is-open .nav-mobile-chevron {
  transform: rotate(-135deg) translate(-1px, -2px);
}

/* Accordion */
.nav-mobile-accordion {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--duration-slow) var(--ease-default);
}

.nav-mobile-accordion.is-open {
  grid-template-rows: 1fr;
}

.nav-mobile-work-list {
  list-style: none;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-3);
  padding-left: var(--space-4);
}

.nav-mobile-work-list a {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 400;
  color: var(--color-text);
  text-decoration: none;
  display: inline-block;
  transition:
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
}

.nav-mobile-work-list a:hover {
  color: var(--color-ruby);
  transform: translateX(6px);
}

/* Prevent scroll when mobile menu open */
body.menu-open {
  overflow: hidden;
}

/* ── Mobile ── */
@media (max-width: 767px) {
  .nav-links {
    display: none;
  }

  .nav-burger {
    display: flex;
  }

  .nav-mobile-menu {
    display: flex;
  }

  .work-panel {
    padding: var(--space-10) 0;
  }

  .work-panel-list {
    padding: 0 var(--space-6);
  }
}