/* ============================================================================
 * layout.css — site chrome: header, primary nav, mega-menu, mobile drawer,
 * footer, and page-section rhythm. Depends on tokens.css + base.css.
 * ==========================================================================*/

/* ---------------------------------------------------------------------------
 * HEADER
 * ------------------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 90;
  background: rgba(251, 251, 253, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
          backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex; align-items: center; gap: var(--s6);
  height: var(--header-h);
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.brand-lockup { display: inline-flex; align-items: center; flex: none; }
.brand-lockup img { height: 26px; width: auto; }
.brand-lockup:hover { opacity: 0.9; }

/* ---- Primary nav (desktop) --------------------------------------------- */
.primary-nav { display: none; }
.primary-nav ul { display: flex; align-items: center; gap: var(--s2); }
.nav-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 14px; border-radius: 10px;
  font-size: var(--fs-sm); font-weight: 600; color: var(--ink-soft);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.nav-link:hover, .nav-link[aria-expanded="true"] { background: var(--surface-2); color: var(--ink); }
.nav-link .caret {
  width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px); opacity: 0.6;
  transition: transform var(--dur-fast) var(--ease);
}
.nav-link[aria-expanded="true"] .caret { transform: rotate(-135deg) translateY(-1px); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: var(--s3); }
.header-actions .link-signin { display: none; font-size: var(--fs-sm); font-weight: 700; color: var(--ink-soft); padding: 9px 6px; }
.header-actions .link-signin:hover { color: var(--ink); }

/* ---- Dropdown / mega-menu (desktop) ------------------------------------ */
.has-menu { position: relative; }
.menu-panel {
  position: absolute; left: 0; top: calc(100% + 10px);
  min-width: 260px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-frame);
  padding: var(--s3);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  z-index: 95;
}
.has-menu.is-open .menu-panel { opacity: 1; visibility: visible; transform: none; }
.menu-panel.mega { left: 50%; transform: translateX(-50%) translateY(8px); width: min(920px, calc(100vw - 2 * var(--gutter))); }
.has-menu.is-open .menu-panel.mega { transform: translateX(-50%); }

.menu-head { display: flex; align-items: baseline; justify-content: space-between; padding: 6px 10px 12px; }
.menu-head b { font-family: var(--font-display); font-size: var(--fs-sm); font-weight: 600; }
.menu-head small { font-size: var(--fs-xs); color: var(--ink-mute); font-weight: 600; }

.menu-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.menu-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 11px; border-radius: 12px;
  transition: background var(--dur-fast) var(--ease);
}
.menu-item:hover { background: var(--surface-2); }
.menu-item .ti { width: 22px; height: 22px; flex: none; }
.menu-item b { font-size: var(--fs-sm); font-weight: 700; color: var(--ink); display: block; line-height: 1.1; }
.menu-item small { font-size: var(--fs-xs); color: var(--ink-mute); font-weight: 500; }

.menu-simple { display: flex; flex-direction: column; gap: 2px; }
.menu-simple .menu-item small { max-width: 34ch; }

/* ---- Hamburger (mobile) ------------------------------------------------- */
.nav-toggle {
  display: inline-grid; place-items: center;
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  border: 1px solid var(--line); background: #fff;
}
.nav-toggle:hover { background: var(--surface-2); }
.nav-toggle .bars { position: relative; width: 20px; height: 14px; }
.nav-toggle .bars span {
  position: absolute; left: 0; width: 100%; height: 2px; border-radius: 2px; background: var(--ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease);
}
.nav-toggle .bars span:nth-child(1) { top: 0; }
.nav-toggle .bars span:nth-child(2) { top: 6px; }
.nav-toggle .bars span:nth-child(3) { top: 12px; }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Mobile drawer ------------------------------------------------------ */
.nav-overlay {
  position: fixed; inset: 0; z-index: 96;
  background: rgba(14, 21, 37, 0.42);
  opacity: 0; visibility: hidden; transition: opacity var(--dur) var(--ease), visibility var(--dur);
}
.nav-overlay.is-open { opacity: 1; visibility: visible; }

.mobile-drawer {
  position: fixed; top: 0; right: 0; z-index: 97;
  width: min(400px, 88vw); height: 100dvh;
  background: #fff; box-shadow: var(--shadow-frame);
  transform: translateX(100%);
  transition: transform var(--dur) var(--ease);
  display: flex; flex-direction: column;
  overflow-y: auto;
}
.mobile-drawer.is-open { transform: none; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: var(--s5) var(--s6); border-bottom: 1px solid var(--line); position: sticky; top: 0; background: #fff; }
.drawer-head img { height: 24px; }
.drawer-close { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; border: 1px solid var(--line); }
.drawer-close svg { width: 18px; height: 18px; stroke: var(--ink); fill: none; }
.drawer-body { padding: var(--s5) var(--s6) var(--s8); }

.acc { border-bottom: 1px solid var(--line-soft); }
.acc-trigger {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 16px 2px; font-family: var(--font-display); font-size: 1.0625rem; font-weight: 600; color: var(--ink);
}
.acc-trigger .caret { width: 9px; height: 9px; border-right: 2px solid var(--ink-mute); border-bottom: 2px solid var(--ink-mute); transform: rotate(45deg); transition: transform var(--dur) var(--ease); }
.acc-trigger[aria-expanded="true"] .caret { transform: rotate(-135deg); }
.acc-panel { overflow: hidden; max-height: 0; transition: max-height var(--dur) var(--ease); }
.acc-panel-inner { padding: 2px 2px 16px; display: flex; flex-direction: column; gap: 2px; }
.acc-panel-inner a { display: flex; align-items: center; gap: 10px; padding: 10px 8px; border-radius: 10px; font-size: var(--fs-sm); font-weight: 600; color: var(--ink-soft); }
.acc-panel-inner a:hover { background: var(--surface-2); }
.acc-panel-inner a .ti { width: 20px; height: 20px; flex: none; }

.drawer-link { display: block; padding: 16px 2px; font-family: var(--font-display); font-size: 1.0625rem; font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--line-soft); }
.drawer-actions { margin-top: var(--s7); display: flex; flex-direction: column; gap: var(--s3); }

/* ---------------------------------------------------------------------------
 * FOOTER
 * ------------------------------------------------------------------------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,0.72); padding-block: var(--s12) var(--s8); }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: var(--s8);
  max-width: var(--container-wide); margin-inline: auto; padding-inline: var(--gutter);
}
.footer-lockup { display: inline-flex; align-items: center; gap: 10px; margin-bottom: var(--s4); }
.footer-lockup img { height: 30px; width: auto; }
.footer-lockup span { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.02em; color: #fff; }
.footer-brand img { height: 30px; width: auto; margin-bottom: var(--s4); }
.menu-all { display: block; margin-top: 6px; padding: 12px 11px; border-radius: 12px; font-size: var(--fs-sm); font-weight: 800; color: var(--blue-deep); }
.menu-all:hover { background: var(--surface-2); }
.footer-brand p { font-size: var(--fs-sm); color: rgba(255,255,255,0.6); max-width: 34ch; line-height: 1.6; }
.footer-brand .parent { margin-top: var(--s4); font-size: var(--fs-xs); color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: var(--fs-xs); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: var(--s4); }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: var(--fs-sm); color: rgba(255,255,255,0.74); font-weight: 500; }
.footer-col a:hover { color: #fff; }
.footer-band { height: 4px; border-radius: 4px; background: var(--band); max-width: var(--container-wide); margin: var(--s10) auto var(--s6); margin-inline: auto; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s4); flex-wrap: wrap;
  max-width: var(--container-wide); margin-inline: auto; padding-inline: var(--gutter);
  font-size: var(--fs-xs); color: rgba(255,255,255,0.5);
}
.footer-bottom .contact { display: flex; gap: var(--s5); flex-wrap: wrap; }
.footer-bottom a { color: rgba(255,255,255,0.66); }

/* ---------------------------------------------------------------------------
 * RESPONSIVE — nav collapse at lg (1024px)
 * ------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .primary-nav { display: block; }
  .nav-toggle { display: none; }
  .header-actions .link-signin { display: inline-flex; }
}
@media (max-width: 1023.98px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s7); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}