/**
 * KoreAves — Shared SurfaceHeader Styles
 * Contemporary Editorial Evidence Atlas
 * Minimal, restrained site-wide navigation bar.
 */

.ka-surface-header {
  width: 100%;
  background-color: var(--ka-color-paper-base, #f7f6f2);
  border-bottom: 1px solid var(--ka-color-rule-hairline, #e2ded5);
  box-sizing: border-box;
  z-index: 100;
  position: relative;
}

.ka-surface-header-inner {
  width: min(calc(100% - var(--ka-space-40)), var(--ka-width-atlas-canvas, 1320px));
  max-width: none;
  margin: 0 auto;
  padding: 0;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-sizing: border-box;
}

.ka-brand-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.ka-brand-link {
  text-decoration: none;
  color: var(--ka-color-ink-primary, #181c19);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.ka-brand-logo {
  font-family: var(--ka-font-latin-serif, "Libre Baskerville", Georgia, serif);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ka-color-ink-primary, #181c19);
}

.ka-brand-divider {
  color: var(--ka-color-rule-strong, #8a968f);
  font-size: 14px;
  user-select: none;
}

.ka-brand-edition {
  font-family: var(--ka-font-hangul-sans, system-ui, sans-serif);
  font-size: 11px;
  font-weight: 500;
  color: var(--ka-color-ink-quiet, #616b64);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.ka-surface-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.ka-surface-nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ka-surface-nav-item {
  margin: 0;
  padding: 0;
}

.ka-learn-menu {
  position: relative;
}

.ka-learn-menu-trigger {
  border: 0;
  background: transparent;
  cursor: pointer;
}

.ka-learn-menu-caret {
  margin-left: 5px;
  font-size: 11px;
  transform: translateY(-1px);
}

.ka-learn-menu-panel {
  position: absolute;
  z-index: 40;
  top: calc(100% + 4px);
  right: 0;
  width: min(280px, calc(100vw - 32px));
  padding: 6px;
  border: 1px solid var(--ka-color-rule-subtle, #d1ccc0);
  border-radius: 6px;
  background: var(--ka-color-paper-base, #f7f6f2);
  box-shadow: 0 8px 24px rgba(24, 28, 25, 0.12);
}

.ka-learn-menu-link {
  display: block;
  padding: 9px 10px;
  border-radius: 4px;
  color: var(--ka-color-ink-secondary, #3b433d);
  font-family: var(--ka-font-hangul-sans, system-ui, sans-serif);
  font-size: 13px;
  text-decoration: none;
}

.ka-learn-menu-link:hover,
.ka-learn-menu-link:focus-visible {
  background: var(--ka-color-paper-sunken, #edebe4);
  color: var(--ka-color-ink-primary, #181c19);
}

.ka-learn-menu-link:focus-visible {
  outline: 2px solid var(--ka-color-focus-ring, #163626);
  outline-offset: -2px;
}

.ka-learn-menu-link.is-active {
  color: var(--ka-color-evidence-present-ink, #163626);
  font-weight: 700;
}

.ka-surface-nav-link,
.ka-learn-menu-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 10px;
  border-radius: 6px;
  text-decoration: none;
  font-family: var(--ka-font-hangul-sans, system-ui, sans-serif);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ka-color-ink-secondary, #3b433d);
  transition: background-color 0.12s ease, color 0.12s ease;
  white-space: nowrap;
}

.ka-surface-nav-link:hover,
.ka-learn-menu-trigger:hover {
  background-color: var(--ka-color-paper-sunken, #edebe4);
  color: var(--ka-color-ink-primary, #181c19);
}

.ka-surface-nav-link:focus-visible,
.ka-learn-menu-trigger:focus-visible {
  outline: 2px solid var(--ka-color-focus-ring, #163626);
  outline-offset: -2px;
}

.ka-surface-nav-link.is-active,
.ka-learn-menu-trigger.is-active {
  color: var(--ka-color-evidence-present-ink, #163626);
  font-weight: 600;
  background-color: transparent;
  border-radius: 0;
  box-shadow: inset 0 -2px 0 var(--ka-color-evidence-present-fill, #244837);
}

.nav-label-full {
  display: inline;
}

.nav-label-short {
  display: none;
}

.ka-surface-header-context {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.ka-surface-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--ka-color-ink-primary, #181c19);
  cursor: pointer;
  flex-shrink: 0;
}

.ka-surface-nav-toggle:hover {
  background-color: var(--ka-color-paper-sunken, #edebe4);
}

.ka-surface-nav-mobile-panel {
  border-top: 1px solid var(--ka-color-rule-hairline, #e2ded5);
  background-color: var(--ka-color-paper-base, #f7f6f2);
  padding: 8px 12px 12px;
}

.ka-mobile-nav-group + .ka-mobile-nav-group {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--ka-color-rule-hairline, #e2ded5);
}

.ka-mobile-nav-group-label {
  display: block;
  padding: 0 8px 4px;
  color: var(--ka-color-ink-quiet, #616b64);
  font-family: var(--ka-font-mono, monospace);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ka-surface-nav-mobile-panel .ka-surface-nav-list {
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
}

.ka-surface-nav-mobile-panel .ka-surface-nav-link {
  justify-content: flex-start;
  width: 100%;
  padding: 10px 8px;
  font-size: 14px;
}

.ka-context-pill {
  font-family: var(--ka-font-mono, monospace);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ka-color-ink-quiet, #616b64);
  background: var(--ka-color-paper-sunken, #edebe4);
  border: 1px solid var(--ka-color-rule-hairline, #e2ded5);
  border-radius: 4px;
  padding: 2px 8px;
}

@media (max-width: 1100px) {
  .nav-label-full {
    display: none;
  }
  .nav-label-short {
    display: inline;
  }
  .ka-surface-nav-link,
  .ka-learn-menu-trigger {
    padding: 0 8px;
    font-size: 12px;
  }
  .ka-surface-header-context {
    display: none;
  }
}

@media (max-width: 768px) {
  .ka-surface-header-inner {
    width: min(calc(100% - var(--ka-space-24)), var(--ka-width-atlas-canvas, 1320px));
  }
}

@media (max-width: 900px) {
  .ka-brand-divider,
  .ka-brand-edition {
    display: none;
  }
  .ka-surface-header-inner { height: 44px; }
}

@media (max-width: 600px) {
  .ka-brand-divider,
  .ka-brand-edition {
    display: none;
  }
  .ka-surface-header-inner {
    gap: 6px;
  }
  /* At 600px and below, top-level navigation no longer fits comfortably next to
     the brand — collapse into a hamburger disclosure instead of continuing
     to shrink text/padding. */
  .ka-surface-nav {
    display: none;
  }
  .ka-surface-nav-toggle {
    display: inline-flex;
  }
}

/* Ownership: SurfaceHeader owns navigation-toggle interaction. */
.ka-surface-nav-toggle {
  background-color: var(--ka-control-face);
  border: 1px solid var(--ka-control-edge);
  box-shadow: var(--ka-control-press-inset);
  transition: var(--ka-control-transition);
}
.ka-surface-nav-toggle:hover { border-color: var(--ka-control-edge-strong); }
.ka-surface-nav-toggle:active {
  transform: translateY(1px);
  box-shadow: var(--ka-control-active-inset);
}