/* Portfolio topbar styles, mirrored from main.css. Shared behavior stays in main.js. */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--gutter);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition:
    border-color 0.3s var(--ease),
    background 0.3s var(--ease);
}

.nav.is-scrolled {
  border-bottom-color: var(--rule);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
}

.nav__brand-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.nav__mark {
  width: 48px;
  height: 34px;
  box-sizing: border-box;
  padding: 7px 6px;
  display: block;
  border: 1px solid var(--ink);
  color: var(--ink);
  fill: currentColor;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink-soft);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--ink-mute);
  background: var(--bg-soft);
}

.theme-toggle__icon {
  width: 17px;
  height: 17px;
  display: grid;
  place-items: center;
  line-height: 0;
}

.theme-toggle__icon svg {
  width: 17px;
  height: 17px;
  display: block;
}

.settings-toggle {
  text-decoration: none;
}

.settings-toggle[aria-current="page"] {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--bg-soft);
}

/* hamburger — mobile only */
.nav__burger {
  display: none;
  background: none;
  border: 0;
  padding: 0.4rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  position: relative;
  z-index: 70;
}

.nav__burger-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  margin: 5px auto;
  transition:
    transform 0.3s var(--ease),
    opacity 0.2s var(--ease);
  transform-origin: center;
}

.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(2) {
  opacity: 0;
}

.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.nav__links {
  display: flex;
  gap: 1.75rem;
  align-items: center;
}

.nav__links > a {
  font-size: 0.9rem;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.2s var(--ease);
}

.nav__links > a:hover {
  color: var(--ink);
}

.nav__links > a[aria-current="page"] {
  color: var(--ink);
}

.nav__links > a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav__links > a:hover::after,
.nav__links > a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* dropdown group */
.nav__group {
  position: relative;
}

.nav__toggle {
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--ink-soft);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  position: relative;
  transition: color 0.2s var(--ease);
}

.nav__toggle:hover,
.nav__toggle[aria-expanded="true"] {
  color: var(--ink);
}

.nav__toggle::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav__toggle:hover::after,
.nav__toggle[aria-expanded="true"]::after {
  transform: scaleX(1);
}

.nav__caret {
  display: inline-block;
  width: 0.42rem;
  height: 0.42rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  font-size: 0;
  transition: transform 0.25s var(--ease);
  transform-origin: center;
  transform: translateY(-0.12rem) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__caret {
  transform: translateY(0.08rem) rotate(225deg);
}

.nav__menu {
  position: absolute;
  top: calc(100% + 14px);
  right: 0;
  min-width: 320px;
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 0.35rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 0.25s var(--ease),
    transform 0.25s var(--ease);
  pointer-events: none;
  z-index: 60;
}

.nav__menu:not([hidden]) {
  opacity: 1;
  visibility: visible;
  transform: none;
  pointer-events: auto;
}

.nav__menu[hidden] {
  display: block;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.nav__menu-head {
  display: block;
  padding: 0.9rem 1rem 1rem;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: background 0.2s var(--ease);
}

.nav__menu-head:hover {
  background: var(--bg-soft);
}

.nav__menu-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.nav__menu-sub {
  display: block;
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

.nav__menu-kind {
  display: block;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.35rem;
}

.nav__menu-section {
  margin: 0;
  padding: 0.85rem 1rem 0.25rem;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.nav__menu-list {
  display: flex;
  flex-direction: column;
  padding: 0.35rem 0;
}

.nav__menu-list a {
  display: block;
  padding: 0.55rem 1rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  transition:
    background 0.15s var(--ease),
    color 0.15s var(--ease);
}

.nav__menu-list a:hover {
  background: var(--bg-soft);
  color: var(--ink);
}

.nav__menu-list a[aria-current="page"] {
  color: var(--ink);
  background: var(--bg-soft);
  position: relative;
}

.nav__menu-list a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}

/* ---- mobile nav drawer ---- */
@media (max-width: 820px) {
  .nav {
    padding: 0.9rem var(--gutter);
  }

  .nav__burger {
    display: block;
  }

  .nav__links {
    position: fixed;
    inset: 0;
    background: var(--bg);
    padding: 6rem var(--gutter) 2rem;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition:
      opacity 0.3s var(--ease),
      transform 0.3s var(--ease);
    overflow-y: auto;
    z-index: 60;
  }

  .nav__links.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav__links > a,
  .nav__group {
    border-top: 1px solid var(--rule);
  }

  .nav__links > a {
    padding: 1.1rem 0;
    font-size: 1.05rem;
    color: var(--ink);
  }

  .nav__links > a::after {
    display: none;
  }

  .nav__group {
    display: block;
    padding: 0;
  }

  .nav__toggle {
    width: 100%;
    padding: 1.1rem 0;
    font-size: 1.05rem;
    color: var(--ink);
    justify-content: space-between;
  }

  .nav__toggle::after {
    display: none;
  }

  /* on mobile, the submenu becomes an inline expanded list, not a popover */
  .nav__menu {
    position: static;
    min-width: 0;
    width: 100%;
    border: 0;
    padding: 0 0 0.75rem;
    background: transparent;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    max-height: none;
    overflow: visible;
  }

  .nav__menu[hidden] {
    display: none;
  }

  .nav__menu-head {
    padding: 0.5rem 0 0.75rem;
    border-bottom: 1px solid var(--rule);
  }

  .nav__menu-section {
    padding: 0.85rem 0 0.25rem;
  }

  .nav__menu-list a {
    padding: 0.65rem 0 0.65rem 1rem;
    font-size: 0.95rem;
  }

  .nav__menu-list {
    max-height: none;
    overflow: visible;
  }

  .nav__menu-list a[aria-current="page"] {
    background: transparent;
  }

  .nav__menu-list a[aria-current="page"]::before {
    left: 0;
    width: 2px;
  }
}

@media (max-width: 480px) {
  .nav__links > a,
  .nav__toggle {
    font-size: 1rem;
  }
}