/* Xandriq - header.css
 * Telemetry-bar header (UNIKÁLIS) - top-row 32px + main 60px + paired-rule + scroll-collapse.
 */

.site-header {
  position: sticky;
  top: 0;
  background: var(--c-bg);
  z-index: 100;
}

/* ===== Top row: telemetry-bar (32px) ===== */
.telemetry-bar {
  height: 32px;
  border-bottom: 1px solid var(--c-border);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--s-32);
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  transition: height var(--dur) var(--ease), opacity var(--dur) var(--ease);
  overflow: hidden;
}

.telemetry-bar__left {
  text-align: left;
}

.telemetry-bar__center {
  color: var(--c-success);
  text-align: center;
}

.telemetry-bar__center::before {
  content: "● ";
  color: var(--c-success);
}

.telemetry-bar__right {
  text-align: right;
}

.site-header.is-scrolled .telemetry-bar {
  height: 0;
  opacity: 0;
  border-bottom: 0;
}

/* ===== Main row (60px) ===== */
.main-row {
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--s-32);
  position: relative;
}

.main-row::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(
    to bottom,
    var(--c-accent) 0 1px,
    transparent 1px 5px,
    var(--c-border) 5px 6px
  );
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--f-heading);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--c-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.wordmark:hover {
  color: var(--c-accent);
  text-decoration: none;
}

.wordmark::after {
  content: "/INDEX";
  margin-left: var(--s-8);
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--c-text-dim);
  letter-spacing: 0.04em;
}

/* ===== Main nav ===== */
.main-nav {
  display: flex;
}

.main-nav ul {
  display: flex;
  gap: var(--s-24);
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  font-family: var(--f-body);
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--c-text);
  text-decoration: none;
  position: relative;
  padding: var(--s-8) 0;
}

.main-nav a:hover {
  color: var(--c-accent);
  text-decoration: none;
}

.main-nav a.is-active {
  color: var(--c-accent);
}

.main-nav a.is-active::after {
  content: "▣";
  position: absolute;
  left: 50%;
  bottom: -2px;
  transform: translateX(-50%);
  font-family: var(--f-mono);
  font-size: 0.625rem;
  color: var(--c-accent);
}

/* ===== Mobile hamburger ===== */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  position: relative;
  cursor: pointer;
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  height: 1px;
  background: var(--c-text);
}

.nav-toggle__bar {
  top: 19px;
}

.nav-toggle__bar::before {
  top: -6px;
  left: 0;
  right: 0;
}

.nav-toggle__bar::after {
  top: 6px;
  left: 0;
  right: 0;
}

.nav-toggle:hover {
  border-color: var(--c-accent);
}

.nav-toggle:hover .nav-toggle__bar,
.nav-toggle:hover .nav-toggle__bar::before,
.nav-toggle:hover .nav-toggle__bar::after {
  background: var(--c-accent);
}

/* ===== Mobile overlay nav ===== */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--c-special);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
  overflow-y: auto;
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__inner {
  padding: var(--s-24) var(--s-32);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.mobile-nav__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
  margin-bottom: var(--s-40);
}

.mobile-nav__close {
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text);
  font-family: var(--f-mono);
  font-size: 1rem;
  cursor: pointer;
}

.mobile-nav__close:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav li {
  margin: 0;
  border-bottom: 1px solid var(--c-border);
}

.mobile-nav li:first-child {
  border-top: 1px solid var(--c-border);
}

.mobile-nav a {
  display: block;
  padding: var(--s-24) 0;
  font-family: var(--f-heading);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--c-text);
  text-decoration: none;
}

.mobile-nav a:hover,
.mobile-nav a.is-active {
  color: var(--c-accent);
}

.mobile-nav__meta {
  margin-top: auto;
  padding-top: var(--s-40);
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
  text-transform: uppercase;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .telemetry-bar {
    display: none;
  }
  .main-nav {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .main-row {
    padding: 0 var(--s-24);
  }
}

body.xq-nav-open {
  overflow: hidden;
}