/* ===== Reset & Variables ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol, address { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
address { font-style: normal; }

:root {
  --color-navy: #0a1f3c;
  --color-navy-deep: #071529;
  --color-gold: #c9a84c;
  --color-gold-light: #e6d9b8;
  --color-red: #e05a33;
  --color-cream: #f7f2e7;
  --color-ink: #1f1f1f;
  --color-teal: #1e5a6e;
  --color-glass: rgba(255, 255, 255, 0.7);
  --color-line: rgba(10, 31, 60, 0.12);
  --color-gold-alpha: rgba(201, 168, 76, 0.35);
  --font-heading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Consolas, monospace;
  --container-max: 1200px;
  --transition: 160ms ease;
}

::selection { background: var(--color-gold); color: var(--color-navy); }

:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px var(--color-navy);
  border-radius: 2px;
}

body {
  background: var(--color-cream);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-navy);
  line-height: 1.3;
  font-weight: 700;
}
h1 { font-size: clamp(2rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); }
h3 { font-size: 1.25rem; }

#main-content:focus { outline: none; }

/* ===== Utilities ===== */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.site-skip {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 300;
  background: var(--color-gold);
  color: var(--color-navy);
  border: 2px solid var(--color-navy);
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  transition: top var(--transition);
}
.site-skip:focus { top: 0.75rem; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-red));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 400;
  pointer-events: none;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.06em;
  border: 2px solid var(--color-gold);
  border-radius: 2px;
  color: var(--color-navy);
  background: transparent;
  text-align: center;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.btn:hover { background: var(--color-gold); color: var(--color-navy); }
.btn--primary { background: var(--color-navy); border-color: var(--color-navy); color: #fff; }
.btn--primary:hover { background: var(--color-gold); border-color: var(--color-gold); color: var(--color-navy); }
.btn--ghost { border-color: rgba(255, 255, 255, 0.4); color: #fff; }
.btn--ghost:hover { border-color: var(--color-gold); background: rgba(201, 168, 76, 0.15); color: var(--color-gold); }
.btn--small { padding: 0.4rem 0.9rem; font-size: 0.85rem; }

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 100;
  background:
    linear-gradient(135deg, rgba(201, 168, 76, 0.06) 0%, transparent 45%),
    linear-gradient(180deg, var(--color-navy) 0%, #0d2440 100%);
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--color-gold-alpha);
  box-shadow: 0 2px 0 0 rgba(201, 168, 76, 0.18), 0 10px 30px rgba(10, 31, 60, 0.28);
}

.site-header__topbar { border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.site-header__topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
}
.site-header__tagline { color: var(--color-gold-light); }
.site-header__toplink {
  color: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.site-header__toplink:hover { color: var(--color-gold); border-bottom-color: var(--color-gold); }

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  padding-block: 1.15rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  justify-self: start;
  min-width: 0;
}
.brand__mark {
  position: relative;
  display: block;
  width: 1.9rem;
  height: 2.3rem;
  flex: none;
}
.brand__mark::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0.95rem;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  z-index: 2;
}
.brand__mark::after {
  content: "";
  position: absolute;
  top: 0.55rem;
  left: 0;
  width: 100%;
  height: calc(100% - 0.55rem);
  border: 2px solid var(--color-gold);
  border-top: none;
  box-sizing: border-box;
}
.brand__door {
  position: absolute;
  bottom: 0.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0.55rem;
  height: 0.8rem;
  background: var(--color-gold);
  z-index: 2;
}
.brand__text {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #fff;
  line-height: 1;
  white-space: nowrap;
}
.brand__text em {
  font-style: normal;
  color: var(--color-gold);
  margin-left: 0.25rem;
}

.site-nav {
  grid-column: 2;
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.site-nav__item { position: relative; }
.site-nav__item + .site-nav__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  width: 0.34rem;
  height: 0.34rem;
  background: var(--color-gold);
  opacity: 0.65;
  z-index: 1;
}
.site-nav__link {
  display: block;
  position: relative;
  padding: 0.8rem 1.35rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.82);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 1.35rem;
  right: 1.35rem;
  bottom: 0;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 200ms ease;
}
.site-nav__link:hover { color: var(--color-gold); background: rgba(201, 168, 76, 0.06); }
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--color-gold); background: rgba(201, 168, 76, 0.1); }

.site-header__card {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.4rem 0.7rem 0.4rem 0.4rem;
  border: 1px solid var(--color-gold-alpha);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.04);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.site-header__card:hover {
  background: rgba(201, 168, 76, 0.12);
  border-color: var(--color-gold);
  box-shadow: 0 0 0 1px rgba(201, 168, 76, 0.1);
}
.site-header__card-seal {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  background: var(--color-red);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  transform: rotate(-6deg);
  border-radius: 2px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}
.site-header__card-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.55);
}
.site-header__card-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-gold);
  letter-spacing: 0.08em;
}

.site-nav__mobile-card { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.6rem;
  border: 1px solid var(--color-gold-alpha);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.04);
  justify-self: end;
  transition: background var(--transition), border-color var(--transition);
}
.nav-toggle:hover { border-color: var(--color-gold); background: rgba(201, 168, 76, 0.12); }
.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--color-gold);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Footer ===== */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 6vw, 5rem);
  background: linear-gradient(180deg, var(--color-navy) 0%, var(--color-navy-deep) 100%);
  color: rgba(255, 255, 255, 0.75);
  border-top: 2px solid var(--color-gold);
  font-size: 0.95rem;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -0.6rem;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 1.1rem;
  height: 1.1rem;
  background: var(--color-gold);
  border: 2px solid var(--color-navy);
  box-shadow: inset 0 0 0 1px var(--color-gold-light);
  z-index: 1;
}

.site-footer__top { padding-block: clamp(2.5rem, 5vw, 4rem) 2rem; }

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.2fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.brand--footer .brand__text { font-size: 1.5rem; }

.site-footer__statement {
  max-width: 34ch;
  margin-block: 1rem 1.5rem;
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.9rem;
  line-height: 1.8;
}

.site-footer__switch {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.site-footer__switch-label {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.1em;
}
.site-footer__switch-group {
  display: inline-flex;
  border: 1px solid var(--color-gold-alpha);
  border-radius: 2px;
  overflow: hidden;
}
.site-footer__switch-btn {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.08em;
  transition: background var(--transition), color var(--transition);
}
.site-footer__switch-btn + .site-footer__switch-btn { border-left: 1px solid var(--color-gold-alpha); }
.site-footer__switch-btn:hover { color: var(--color-gold); background: rgba(201, 168, 76, 0.12); }
.site-footer__switch-btn[aria-pressed="true"] {
  background: var(--color-gold);
  color: var(--color-navy);
  font-weight: 700;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-gold);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(201, 168, 76, 0.25);
}
.site-footer__links { display: grid; gap: 0.55rem; }
.site-footer__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition), transform 200ms ease;
}
.site-footer__links a::before {
  content: "";
  width: 0.3rem;
  height: 0.3rem;
  background: var(--color-gold);
  opacity: 0.5;
  transform: rotate(45deg);
  transition: opacity var(--transition), background var(--transition);
}
.site-footer__links a:hover { color: var(--color-gold); }
.site-footer__links a:hover::before { opacity: 1; background: var(--color-gold-light); }

.site-footer__address p {
  margin-bottom: 0.45rem;
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.9rem;
}
.site-footer__address strong {
  display: inline-block;
  min-width: 2.4em;
  margin-right: 0.6rem;
  color: var(--color-gold-light);
  font-weight: 600;
  letter-spacing: 0.1em;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-block: 1.25rem;
  background: rgba(0, 0, 0, 0.15);
}
.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}
.site-footer__inspect { display: inline-flex; align-items: center; gap: 0.5rem; }
.site-footer__inspect-code {
  font-family: var(--font-mono);
  color: var(--color-gold);
  border: 1px dashed var(--color-gold-alpha);
  padding: 0.15rem 0.6rem;
  font-size: 0.8rem;
}
.site-footer__meta { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; }
.site-footer__divider { color: var(--color-gold); font-size: 0.6rem; opacity: 0.7; }
.site-footer__meta-link { color: var(--color-gold-light); transition: color var(--transition); }
.site-footer__meta-link:hover { color: var(--color-gold); text-decoration: underline; }

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 200;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--color-gold);
  background: var(--color-navy);
  color: var(--color-gold);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  line-height: 1;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition: opacity var(--transition), transform var(--transition), background var(--transition), color var(--transition);
}
.back-to-top[data-visible] { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { background: var(--color-gold); color: var(--color-navy); }

/* ===== Shared content components ===== */
.breadcrumb { font-size: 0.85rem; margin-bottom: 1.5rem; }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.breadcrumb__list li { display: inline-flex; align-items: center; gap: 0.5rem; }
.breadcrumb__list li + li::before {
  content: "";
  width: 0.3rem;
  height: 0.3rem;
  background: var(--color-gold);
  transform: rotate(45deg);
}
.breadcrumb__list a { color: var(--color-teal); transition: color var(--transition); }
.breadcrumb__list a:hover { color: var(--color-red); }
.breadcrumb__list [aria-current="page"] { color: var(--color-navy); font-weight: 600; }

.prose { max-width: 75ch; line-height: 1.9; }
.prose p { margin-bottom: 1.25rem; }
.prose h2, .prose h3 { margin-top: 2.5rem; margin-bottom: 1rem; }
.prose ul, .prose ol { margin: 0 0 1.25rem 1.2rem; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose a { color: var(--color-teal); border-bottom: 1px solid var(--color-gold); transition: color var(--transition), border-color var(--transition); }
.prose a:hover { color: var(--color-red); border-bottom-color: var(--color-red); }
.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.8rem 1.25rem;
  border-left: 4px solid var(--color-gold);
  background: rgba(201, 168, 76, 0.08);
  font-family: var(--font-heading);
}

.section-heading { margin-bottom: 2rem; }
.section-heading__kicker {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--color-red);
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.section-heading__title { display: inline-block; position: relative; padding-bottom: 0.6rem; }
.section-heading__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2.5rem;
  height: 3px;
  background: var(--color-gold);
}

.grid { display: grid; gap: 1.5rem; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: 3px;
  padding: 1.75rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform 200ms ease;
}
.card:hover {
  border-color: var(--color-gold);
  box-shadow: 0 8px 24px rgba(10, 31, 60, 0.08);
  transform: translateY(-3px);
}
.card__title { font-size: 1.3rem; margin-bottom: 0.75rem; }
.card__text { color: rgba(31, 31, 31, 0.75); font-size: 0.95rem; }
.card__link {
  display: inline-block;
  margin-top: 1.25rem;
  color: var(--color-red);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.card__link:hover { border-bottom-color: var(--color-red); color: var(--color-navy); }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--color-gold);
  color: var(--color-navy);
  background: transparent;
}
.tag--hot { background: var(--color-red); border-color: var(--color-red); color: #fff; }
.tag--new { background: var(--color-teal); border-color: var(--color-teal); color: #fff; }

.img-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.1), rgba(201, 168, 76, 0.03)), var(--color-navy);
  border: 1px solid var(--color-gold-alpha);
  overflow: hidden;
}
.img-frame::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  width: 2rem;
  height: 2rem;
  border-top: 2px solid var(--color-gold);
  border-left: 2px solid var(--color-gold);
  opacity: 0.8;
}
.img-frame::after {
  content: "";
  position: absolute;
  right: 0.5rem;
  bottom: 0.5rem;
  width: 0.35rem;
  height: 0.35rem;
  background: var(--color-red);
  transform: rotate(45deg);
}
.img-frame--portrait { aspect-ratio: 3 / 4; }
.img-frame--wide { aspect-ratio: 21 / 9; }

.glass-panel {
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  padding: 1.5rem;
}

.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--color-gold);
}
.timeline__item { position: relative; padding-bottom: 2rem; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  top: 0.4rem;
  left: -2.4rem;
  width: 0.7rem;
  height: 0.7rem;
  background: var(--color-cream);
  border: 3px solid var(--color-gold);
  transform: rotate(45deg);
}

.accordion {
  border: 1px solid var(--color-line);
  background: var(--color-cream);
}
.accordion + .accordion { border-top: none; }
.accordion summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-navy);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background var(--transition), color var(--transition);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::before {
  content: "＋";
  color: var(--color-gold);
  font-size: 0.9rem;
  transition: transform var(--transition);
}
.accordion[open] summary::before { content: "－"; }
.accordion summary:hover { background: rgba(201, 168, 76, 0.12); }
.accordion__body {
  padding: 0 1.25rem 1.25rem 2.75rem;
  color: rgba(31, 31, 31, 0.8);
  font-size: 0.95rem;
}

.notice {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--color-red);
  background: rgba(224, 90, 51, 0.06);
}
.notice--gold { border-left-color: var(--color-gold); background: rgba(201, 168, 76, 0.08); }
.notice__label {
  flex: none;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-red);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
}
.notice--gold .notice__label { color: var(--color-navy); }

.page-hero {
  background: linear-gradient(120deg, var(--color-navy) 0%, #0d2440 55%, #123a4d 100%);
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--color-gold);
  padding-block: clamp(2.5rem, 6vw, 5rem);
}
.page-hero__title { color: #fff; margin-bottom: 0.75rem; }
.page-hero__intro { max-width: 60ch; color: rgba(255, 255, 255, 0.7); }

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .site-header__inner { column-gap: 0.75rem; }
  .site-nav__link { padding: 0.8rem 0.9rem; font-size: 0.95rem; }
  .site-nav__link::after { left: 0.9rem; right: 0.9rem; }
  .site-header__card-name { font-size: 0.9rem; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; gap: 2rem 1.5rem; }
  .site-footer__brand-col { grid-column: 1 / -1; }
}

@media (max-width: 1024px) {
  .site-header__card-text { display: none; }
  .site-header__card {
    padding: 0.3rem;
  }
  .site-header__card-seal { width: 2.2rem; height: 2.2rem; }
}

@media (max-width: 860px) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: 1rem;
  }
  .site-header__card { display: none; }
  .nav-toggle { display: flex; grid-column: 2; grid-row: 1; }
  .brand { grid-column: 1; grid-row: 1; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 120;
    display: none;
    background: linear-gradient(180deg, #0a1f3c, var(--color-navy-deep));
    border-top: 1px solid var(--color-gold-alpha);
    border-bottom: 1px solid var(--color-gold-alpha);
    box-shadow: 0 18px 36px rgba(4, 12, 24, 0.45);
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list { flex-direction: column; padding: 0.5rem 1.25rem 0; }
  .site-nav__item + .site-nav__item::before { display: none; }
  .site-nav__link {
    padding: 0.9rem 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] {
    color: var(--color-gold);
    background: rgba(201, 168, 76, 0.1);
    box-shadow: inset 3px 0 0 var(--color-gold);
  }
  .site-nav__mobile-card {
    display: block;
    padding: 1rem 1.25rem 1.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }
  .site-nav__mobile-card .site-header__card {
    display: flex;
    width: 100%;
    justify-content: center;
    justify-self: stretch;
  }
  .site-nav__mobile-card .site-header__card-text { display: block; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .site-header__topbar { display: none; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .site-footer__brand-col { grid-column: auto; }
  .site-footer__bottom-inner { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
  .site-footer__switch { flex-wrap: wrap; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .back-to-top { right: 1rem; bottom: 1rem; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}