/* ==========================================================================
   Site Header — Sticky bar with desktop nav, burger drawer, theme + lang toggles.
   Markup is loaded from partials/header.html
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background-color: var(--bg);
  border-bottom: 2px solid var(--stroke);
  padding-top: var(--safe-top);
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  height: var(--header-h);
  padding-inline: var(--gutter);
}

@media (max-width: 768px) {
  .site-header__inner {
    height: var(--header-h-sm);
  }
}

/* ---- Wordmark (left) --------------------------------------------------- */

.site-header__brand {
  font-family: var(--ff-display);
  font-size: 1.5rem;
  letter-spacing: var(--ls-tight);
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: none;
}

.site-header__brand::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background-color: var(--accent);
  border: 2px solid var(--stroke);
  margin-left: 2px;
}

/* ---- Desktop nav (center/right) --------------------------------------- */

.site-header__nav {
  display: none;
}

@media (min-width: 900px) {
  .site-header__nav {
    display: flex;
    gap: var(--sp-2);
    align-items: center;
  }
}

.site-header__nav a {
  font-family: var(--ff-mono);
  font-size: var(--fs-mono);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
  color: var(--ink);
  padding: 0.5rem 0.75rem;
  border: 2px solid transparent;
  background: none;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.site-header__nav a:hover {
  border-color: var(--stroke);
  background-color: var(--surface);
}

.site-header__nav a[aria-current="page"] {
  background-color: var(--accent);
  border-color: var(--stroke);
  color: var(--ink-on-accent);
  box-shadow: var(--sh-xs);
}

/* ---- Right cluster (toggles + burger) --------------------------------- */

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Mobile: theme + language only in drawer — keep header bar to brand + burger */
@media (max-width: 899px) {
  .site-header__actions > [data-theme-toggle],
  .site-header__actions > [data-lang-toggle] {
    display: none;
  }
}

/* ===== Burger button ===================================================== */

.burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--surface);
  border: 2px solid var(--stroke);
  box-shadow: var(--sh-xs);
  cursor: pointer;
  position: relative;
  transition: box-shadow var(--dur-quick) var(--ease),
              transform var(--dur-quick) var(--ease);
}

@media (min-width: 900px) {
  .burger { display: none; }
}

.burger:active {
  transform: translate(2px, 2px);
  box-shadow: var(--sh-press);
}

.burger__box {
  position: relative;
  width: 22px;
  height: 16px;
}

.burger__line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2.5px;
  background-color: var(--ink);
  transition: transform var(--dur) var(--ease),
              opacity   var(--dur) var(--ease),
              top       var(--dur) var(--ease);
}

.burger__line:nth-child(1) { top: 0; }
.burger__line:nth-child(2) { top: 50%; transform: translateY(-50%); }
.burger__line:nth-child(3) { top: 100%; transform: translateY(-100%); }

/* Active state — morph to X */
.burger[aria-expanded="true"] .burger__line:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

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

.burger[aria-expanded="true"] .burger__line:nth-child(3) {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

/* ===== Off-canvas Drawer ================================================ */

.drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  pointer-events: none;
  visibility: hidden;
}

.drawer[data-open="true"] {
  pointer-events: auto;
  visibility: visible;
}

.drawer__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(17, 17, 17, 0.55);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.drawer[data-open="true"] .drawer__backdrop { opacity: 1; }

.drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(86vw, 380px);
  background-color: var(--bg);
  border-left: 3px solid var(--stroke);
  box-shadow: -8px 0 0 0 var(--accent);   /* signature lime "spine" */
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease);
  display: flex;
  flex-direction: column;
  padding: calc(var(--safe-top) + var(--sp-6)) var(--sp-6) calc(var(--safe-bottom) + var(--sp-6));
  gap: var(--sp-6);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.drawer[data-open="true"] .drawer__panel {
  transform: translateX(0);
}

.drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-2);
}

.drawer__title {
  font-family: var(--ff-mono);
  font-size: var(--fs-kicker);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-extra);
  color: var(--ink-dim);
}

.drawer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.drawer__nav a {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 7vw, 2.5rem);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--ink);
  text-decoration: none;
  background: none;
  padding-block: var(--sp-2);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.drawer__nav a::before {
  content: "→";
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  color: var(--accent);
}

.drawer__nav a:hover,
.drawer__nav a:focus-visible {
  padding-left: var(--sp-2);
}

.drawer__nav a:hover::before,
.drawer__nav a:focus-visible::before,
.drawer__nav a[aria-current="page"]::before {
  opacity: 1;
  transform: translateX(0);
}

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

.drawer__footer {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding-top: var(--sp-6);
  border-top: 2px solid var(--stroke);
}

.drawer__socials {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.drawer__socials a {
  font-family: var(--ff-mono);
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--stroke);
  background-color: var(--surface);
  color: var(--ink);
  background-image: none;
  transition: background-color var(--dur) var(--ease);
}

.drawer__socials a:hover { background-color: var(--accent); }

/* Lock body scroll while drawer is open — class set by JS */
/* (Already declared in base.css as body.is-locked) */