/* ═══════════════════════════════════════════════
   SERASMAC v2 — Header
   Data contract: data-sm-header, data-sm-nav-toggle,
   data-sm-nav-drawer, data-sm-nav-overlay, data-sm-nav-close
   ═══════════════════════════════════════════════ */

/* ── Utility bar ── */
.sm-header__utility {
  background: var(--sm-navy-deep);
  color: rgba(255,255,255,0.7);
  font-size: var(--sm-text-xs);
  padding: var(--sm-space-2) 0;
}

.sm-header__util-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sm-space-2);
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color var(--sm-duration-fast);
}
.sm-header__util-link:hover { color: #fff; }
.sm-header__util-link .sm-icon { width: 14px; height: 14px; }

/* ── Header bar ── */
.sm-header__bar {
  background: var(--sm-surface);
  border-bottom: 1px solid var(--sm-line);
  padding: var(--sm-space-3) 0;
  position: relative;
  z-index: var(--sm-z-sticky);
  transition: box-shadow var(--sm-duration-normal) var(--sm-ease-out);
}

.sm-header.stuck .sm-header__bar {
  box-shadow: var(--sm-shadow-sm);
}

/* ── Brand ── */
.sm-brand {
  display: flex;
  align-items: center;
  gap: var(--sm-space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.sm-brand__name {
  font-family: var(--sm-font-display);
  font-size: var(--sm-text-xl);
  font-weight: 700;
  color: var(--sm-navy);
  letter-spacing: var(--sm-tracking-tight);
}

.sm-brand__name--light { color: #fff; }

.sm-brand__tagline {
  font-size: var(--sm-text-xs);
  color: var(--sm-ink-muted);
  letter-spacing: var(--sm-tracking-wide);
  border-left: 1px solid var(--sm-line);
  padding-left: var(--sm-space-3);
}

/* ── Desktop nav ── */
.sm-nav__list {
  display: flex;
  align-items: center;
  gap: var(--sm-space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.sm-nav__link {
  display: flex;
  align-items: center;
  padding: var(--sm-space-2) var(--sm-space-3);
  font-size: var(--sm-text-sm);
  font-weight: 500;
  color: var(--sm-ink-soft);
  text-decoration: none;
  border-radius: var(--sm-radius-md);
  transition: color var(--sm-duration-fast), background var(--sm-duration-fast);
  white-space: nowrap;
  min-height: 44px;
}

.sm-nav__link:hover {
  color: var(--sm-teal);
  background: var(--sm-canvas-deep);
}

/* ── Header actions ── */
.sm-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sm-space-3);
}

/* ── Toggle button ── */
.sm-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--sm-line);
  border-radius: var(--sm-radius-md);
  background: var(--sm-surface);
  color: var(--sm-ink);
  cursor: pointer;
  transition: border-color var(--sm-duration-fast);
}
.sm-nav-toggle:hover { border-color: var(--sm-ink-muted); }
.sm-nav-toggle__glyph {
  display: grid;
  gap: 4px;
  width: 20px;
}
.sm-nav-toggle__glyph i {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
}

/* ── Mobile drawer ── */
.sm-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(360px, 85vw);
  height: 100vh;
  background: var(--sm-surface);
  z-index: var(--sm-z-drawer);
  transform: translateX(100%);
  transition: transform var(--sm-duration-slow) var(--sm-ease-out);
  overflow-y: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  box-shadow: var(--sm-shadow-xl);
}

.sm-nav-drawer[aria-hidden="false"] {
  transform: translateX(0);
}

.sm-nav-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sm-space-4) var(--sm-space-6);
  border-bottom: 1px solid var(--sm-line);
}

.sm-nav-drawer__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--sm-line);
  border-radius: var(--sm-radius-md);
  background: transparent;
  color: var(--sm-ink);
  cursor: pointer;
}
.sm-nav-close__glyph {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
}
.sm-nav-close__glyph::before,
.sm-nav-close__glyph::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
}
.sm-nav-close__glyph::before { transform: rotate(45deg); }
.sm-nav-close__glyph::after { transform: rotate(-45deg); }

.sm-nav-drawer__list {
  list-style: none;
  padding: var(--sm-space-4) var(--sm-space-6);
  margin: 0;
  flex: 1;
}

.sm-nav-drawer__link {
  display: block;
  padding: var(--sm-space-3) 0;
  font-size: var(--sm-text-md);
  font-weight: 500;
  color: var(--sm-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--sm-line);
  min-height: 44px;
  display: flex;
  align-items: center;
}
.sm-nav-drawer__link:hover { color: var(--sm-teal); }

.sm-nav-drawer__cta {
  padding: var(--sm-space-4) var(--sm-space-6);
  border-top: 1px solid var(--sm-line);
}

/* ── Overlay ── */
.sm-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13,27,30,0.4);
  z-index: calc(var(--sm-z-drawer) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--sm-duration-slow) var(--sm-ease-out);
}

.sm-nav-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* ── Breakpoint: mobile ── */
@media (max-width: 1080px) {
  .sm-nav { display: none; }
  .sm-header__actions { display: none; }
  .sm-header__utility { display: none; }
  .sm-brand__tagline { display: none; }
  .sm-nav-toggle { display: flex; }
}