/* =====================================================================
   Keystone Reg Advisory — layout.css
   Container, grid, header / navigation, mobile menu, frames, footer.
   Breakpoints: 600 (small), 900 (desktop layout), 1100 (wide nav), 1200.
   ===================================================================== */

/* ---------- Container & grid ---------- */
.container {
  width: 100%;
  max-width: calc(var(--max) + 2 * var(--margin));
  margin-inline: auto;
  padding-inline: var(--margin);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--gutter);
}
.grid > * { grid-column: 1 / -1; min-width: 0; }

.section { padding-block: var(--section-y); }

/* Faint architectural column rules, aligned to the container */
.column-rules {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.column-rules::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: min(100% - 2 * var(--margin), var(--max));
  transform: translateX(-50%);
  background-image: repeating-linear-gradient(
    to right,
    var(--rule-faint) 0 1px,
    transparent 1px 100%
  );
  background-size: calc(100% / 6) 100%;
  border-right: 1px solid var(--rule-faint);
}
@media (max-width: 899px) {
  .column-rules::before { background-size: calc(100% / 3) 100%; }
}

/* ---------- Header ---------- */
.site-header {
  --hdr-fg: var(--ivory-100);
  --hdr-fg-2: var(--mist-300);
  --hdr-bg: rgba(11, 17, 32, 0.84);
  --hdr-rule: rgba(244, 240, 231, 0.12);
  --hdr-accent: var(--bronze-300);
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  color: var(--hdr-fg);
  transition:
    transform 0.7s var(--ease-out),
    background-color 0.45s ease,
    box-shadow 0.45s ease,
    color 0.35s ease;
  view-transition-name: site-header;
}
.site-header[data-surface="light"] {
  --hdr-fg: var(--ink-900);
  --hdr-fg-2: var(--graphite-700);
  --hdr-bg: rgba(244, 240, 231, 0.86);
  --hdr-rule: rgba(11, 17, 32, 0.1);
  --hdr-accent: var(--bronze-700);
}
.site-header.is-scrolled {
  background-color: var(--hdr-bg);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: inset 0 -1px 0 var(--hdr-rule);
}
.site-header.is-hidden { transform: translateY(-101%); }

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.4vw, 2.75rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-right: auto;
  color: inherit;
  text-decoration: none;
  min-height: 44px;
}
.brand__mark { width: 26px; height: 26px; flex: none; }
.brand__name {
  font-family: var(--serif);
  font-size: 1.1875rem;
  font-weight: 450;
  letter-spacing: -0.005em;
  white-space: nowrap;
}
.brand__short { display: none; }
@media (max-width: 359px) {
  .brand__name { display: none; }
  .brand__short { display: inline; }
}

.site-nav ul { display: flex; gap: clamp(1.5rem, 2.6vw, 2.75rem); }
.site-nav a {
  position: relative;
  display: inline-block;
  padding-block: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--hdr-fg-2);
  text-decoration: none;
  transition: color var(--dur-micro) ease;
}
.site-nav a::before {
  content: "";
  position: absolute;
  left: -0.85rem;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--hdr-accent);
  transform: translateY(-50%) scale(0);
  transition: transform 0.45s var(--ease-out);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.45rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--ease-out);
}
.site-nav a:hover { color: var(--hdr-fg); }
.site-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.site-nav a[aria-current="page"] { color: var(--hdr-fg); }
.site-nav a[aria-current="page"]::before { transform: translateY(-50%) scale(1); }

.site-header__mail {
  padding-left: clamp(1.25rem, 2.2vw, 2.5rem);
  border-left: 1px solid var(--hdr-rule);
  font-size: 0.8125rem;
  color: var(--hdr-fg-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-micro) ease;
}
.site-header__mail:hover { color: var(--hdr-fg); }

.menu-toggle {
  display: none;
  align-items: center;
  gap: 0.75rem;
  min-height: 44px;
  min-width: 44px;
  padding: 0 0 0 0.75rem;
  background: none;
  border: 0;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
}
.menu-toggle__icon { position: relative; width: 22px; height: 9px; }
.menu-toggle__icon::before,
.menu-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 0.5s var(--ease-out), top 0.5s var(--ease-out);
}
.menu-toggle__icon::before { top: 0; }
.menu-toggle__icon::after { top: 8px; }
.menu-toggle[aria-expanded="true"] .menu-toggle__icon::before { top: 4px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__icon::after { top: 4px; transform: rotate(-45deg); }

@media (max-width: 1099px) { .site-header__mail { display: none; } }
@media (max-width: 899px) {
  .site-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .brand__name { font-size: 1.0625rem; }
}

/* ---------- Mobile menu ---------- */
.menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  overflow-y: auto;
  overscroll-behavior: contain;
  visibility: hidden;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.75s var(--ease-out), visibility 0s linear 0.75s;
}
.menu.is-open {
  visibility: visible;
  clip-path: inset(0 0 0 0);
  transition: clip-path 0.75s var(--ease-out), visibility 0s;
}
.menu__inner {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 3rem;
  padding-top: calc(var(--nav-h) + 1.5rem);
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
}
.menu__list { border-top: 1px solid var(--rule); }
.menu__list li {
  border-bottom: 1px solid var(--rule);
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.5s ease, transform 0.8s var(--ease-out);
  transition-delay: calc(0.12s + var(--i, 0) * 0.06s);
}
.menu.is-open .menu__list li { opacity: 1; transform: none; }
.menu__list a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-block: 1.1rem;
  font-family: var(--serif);
  font-size: clamp(2.25rem, 10vw, 3.25rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.menu__num {
  min-width: 2rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.menu__list a[aria-current="page"] .menu__text { font-style: italic; }

.menu__contact {
  display: grid;
  gap: 1.25rem;
  font-size: 0.9375rem;
  color: var(--fg-2);
}
.menu__contact .label { margin-bottom: 0.25rem; }
.menu__person { display: grid; gap: 0.2rem; }
.menu__person strong { font-weight: 500; color: var(--fg); }
.menu__person a { justify-self: start; }

html.menu-open { overflow: hidden; }
html.menu-open .site-header {
  --hdr-fg: var(--ivory-100);
  --hdr-fg-2: var(--mist-300);
  background: transparent;
  box-shadow: none;
  transform: none;
}

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

/* ---------- Frames: a panel that opens from a framed inset ---------- */
.frame { position: relative; }
.frame__panel { position: relative; }

/* ---------- Footer ---------- */
.site-footer .frame__panel {
  padding-top: clamp(5rem, 3.5rem + 6vw, 9.5rem);
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  overflow: hidden;
}

.footer__grid { row-gap: clamp(3rem, 6vw, 5.5rem); }

.footer__title {
  margin-top: 1.75rem;
  max-width: 17ch;
  font-family: var(--serif);
  font-size: var(--step-4);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.footer__contacts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2.5rem var(--gutter);
}
.contact {
  display: grid;
  align-content: start;
  gap: 0.35rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9375rem;
  color: var(--fg-2);
}
.contact__name {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1.2;
  color: var(--fg);
}
.contact__role { margin-bottom: 0.6rem; }
.contact a { justify-self: start; color: var(--fg); }
.contact__places { color: var(--fg); font-size: 1.0625rem; }

.footer__device {
  --ks-stroke: 0.32;
  display: none;
  align-self: start;
  justify-self: end;
  width: min(100%, 380px);
  aspect-ratio: 1;
  color: var(--rule-2);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
}
.footer__base .brand { margin-right: 0; }
.footer__nav ul { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; }
.footer__nav a {
  display: inline-block;
  padding-block: 0.5rem;
  font-size: 0.875rem;
  color: var(--fg-2);
  text-decoration: none;
  transition: color var(--dur-micro);
}
.footer__nav a:hover,
.footer__nav a[aria-current="page"] { color: var(--fg); }
.footer__legal {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  font-size: 0.8125rem;
  color: var(--fg-3);
}

@media (min-width: 700px) {
  .footer__device { display: block; }
}
@media (min-width: 900px) {
  .footer__intro { grid-column: 1 / span 7; }
  .footer__device { grid-column: 9 / -1; grid-row: 1 / span 2; }
  .footer__contacts { grid-column: 1 / span 7; }
  .footer__base { grid-column: 1 / -1; }
}
@media (min-width: 700px) and (max-width: 899px) {
  .footer__intro { grid-column: 1 / span 8; }
  .footer__device { grid-column: 9 / -1; grid-row: 1; width: 100%; }
}
@media (max-width: 599px) {
  .footer__contacts { grid-template-columns: 1fr; gap: 2rem; }
}