/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 12, 16, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ivory-12);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 2rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-right: auto;
}

.brand__mark { width: 1.5rem; height: 1.5rem; color: var(--gold); }

.brand__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 500;
  white-space: nowrap;
}

.brand__name span { color: var(--ivory-70); font-weight: 400; }

.site-nav { display: flex; gap: 2rem; }

.site-nav a {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ivory-70);
}

.site-nav a:hover { color: var(--ivory); }

.lang-nav {
  display: flex;
  gap: 0.9rem;
  padding-left: 2rem;
  border-left: 1px solid var(--ivory-12);
}

.lang-nav a {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--ivory-45);
}

.lang-nav a:hover { color: var(--ivory); }
.lang-nav a[aria-current="page"] { color: var(--gold); }

@media (max-width: 60rem) {
  .site-nav { display: none; }
}

@media (max-width: 40rem) {
  .brand__name span { display: none; }
  .lang-nav { gap: 0.6rem; padding-left: 1rem; }
}

/* Hero */
.hero {
  padding-block: calc(var(--section) * 1.15) var(--section);
  border-bottom: 1px solid var(--ivory-12);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 1fr);
  align-items: start;
  gap: clamp(2rem, 6vw, 6rem);
}

.hero h1 {
  font-size: clamp(2.5rem, 1.8rem + 3vw, 4.5rem);
  max-width: 20ch;
  margin-top: 1.25rem;
}

.hero h1:lang(zh-Hans) {
  max-width: none;
  font-size: clamp(2.25rem, 1.6rem + 2.6vw, 4rem);
}

.hero .lede { margin-top: 1.75rem; }

.hero__actions { margin-top: 2.5rem; }

.link-line {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--gold);
}

.link-line:hover { color: var(--gold); }

.hero__mark {
  justify-self: end;
  width: clamp(7rem, 12vw, 11rem);
  color: var(--gold);
  margin-top: 0.5rem;
}

@media (max-width: 52rem) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__mark { display: none; }
}

/* Sections */
.section { padding-block: var(--section); border-bottom: 1px solid var(--ivory-12); }

.section h2 {
  font-size: clamp(1.9rem, 1.4rem + 1.6vw, 3rem);
  margin-top: 0.75rem;
  max-width: 22ch;
}

.section__head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }

.section__split {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: clamp(2rem, 5vw, 6rem);
  align-items: start;
}

.prose p { color: var(--ivory-70); max-width: var(--measure); }
.prose p + p { margin-top: 1.25rem; }

@media (max-width: 52rem) {
  .section__split { grid-template-columns: 1fr; }
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 3vw, 3rem) clamp(2rem, 5vw, 5rem);
}

@media (max-width: 52rem) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.card { padding-top: 1.25rem; border-top: 1px solid var(--ivory-12); }

.card__index {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.card h3 { font-size: 1.45rem; margin-top: 0.8rem; }
.card p { margin-top: 0.8rem; color: var(--ivory-70); }

.principle { padding-top: 1.25rem; border-top: 1px solid var(--ivory-12); }
.principle h3 { font-size: 1.4rem; }
.principle p { margin-top: 0.7rem; color: var(--ivory-70); }

/* Contact */
.contact { border-bottom: 0; }

.contact__mail {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 1rem + 1.2vw, 2.1rem);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 0.25rem;
  display: inline-block;
  margin-top: 0.5rem;
}

.contact__mail:hover { color: var(--gold); }

.contact__meta {
  margin-top: 1.25rem;
  color: var(--ivory-45);
  font-size: 0.88rem;
  letter-spacing: 0.03em;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--ivory-12);
  padding-block: 2rem;
  font-size: 0.76rem;
  color: var(--ivory-45);
  letter-spacing: 0.04em;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  justify-content: space-between;
}

.site-footer a:hover { color: var(--ivory); }