.container {
  width: min(100% - 2.25rem, var(--container-max));
  margin-inline: auto;
}

.container-narrow {
  width: min(100% - 2.25rem, var(--container-narrow));
  margin-inline: auto;
}

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

.section-tight {
  padding-block: clamp(2.1rem, 4vw, 3.2rem);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--content-gap);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: saturate(1.2) blur(14px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  transition: background var(--transition-med), border-color var(--transition-med), min-height var(--transition-med);
  min-height: var(--header-height);
}

.site-header.is-sticky {
  background: var(--header-bg-sticky);
  border-color: var(--header-border-sticky);
  min-height: var(--header-height-sticky);
  box-shadow: var(--header-shadow-sticky);
}

.header-inner {
  min-height: inherit;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: 0.7rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.62rem;
  color: var(--text-100);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--brand-mark-border);
  background: var(--brand-mark-bg);
  color: var(--brand-mark-color);
  font-size: 0.92rem;
  box-shadow: var(--brand-mark-inset);
}

.brand-text {
  line-height: 1.1;
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.site-nav {
  margin-left: auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.14rem;
  padding: 0.22rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--surface-faq);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.nav-list li {
  position: relative;
}

.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.38rem;
  min-height: 38px;
  padding: 0.52rem 0.76rem;
  border-radius: 0.65rem;
  color: var(--text-300);
  font-size: 0.89rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    opacity var(--transition-fast);
}

.nav-list a::after,
.nav-kong-toggle::after {
  content: "";
  position: absolute;
  left: 0.72rem;
  right: 0.72rem;
  bottom: 0.3rem;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  opacity: 0;
  transform: scaleX(0.66);
  transform-origin: center;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.nav-list a.nav-priority {
  color: var(--text-100);
  border-color: rgba(132, 169, 252, 0.42);
  background: linear-gradient(145deg, rgba(32, 213, 255, 0.12), rgba(79, 141, 255, 0.14));
}

:root[data-theme="light"] .nav-list a.nav-priority {
  border-color: rgba(97, 132, 202, 0.44);
  background: linear-gradient(145deg, rgba(28, 126, 224, 0.12), rgba(54, 107, 223, 0.13));
}

.nav-list a.nav-priority::before {
  display: none;
}

.nav-list a:hover,
.nav-kong-toggle:hover,
.nav-kong-menu.is-open > .nav-kong-toggle {
  color: var(--text-100);
  background: var(--surface-icon);
  border-color: var(--line-soft);
}

.nav-list a:hover::after,
.nav-kong-toggle:hover::after,
.nav-kong-menu.is-open > .nav-kong-toggle::after {
  opacity: 0.92;
  transform: scaleX(1);
}

.nav-list a[aria-current="page"],
.nav-kong-toggle[aria-current="page"] {
  color: var(--text-100);
  border-color: var(--surface-chip-border);
  background: linear-gradient(130deg, rgba(32, 213, 255, 0.13), rgba(79, 141, 255, 0.16));
}

.nav-list a[aria-current="page"]::after,
.nav-kong-toggle[aria-current="page"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.site-header.is-sticky .nav-list {
  background: var(--surface-faq);
}

.nav-kong-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.42rem;
  min-height: 38px;
  padding: 0.52rem 0.76rem;
  border-radius: 0.65rem;
  border: 1px solid transparent;
  color: var(--text-300);
  font-size: 0.89rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    opacity var(--transition-fast);
}

.nav-kong-caret {
  width: 0.48rem;
  height: 0.48rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform var(--transition-fast);
  opacity: 0.86;
}

.nav-kong-menu.is-open .nav-kong-caret {
  transform: rotate(225deg) translateY(-1px);
}

.nav-kong-submenu {
  position: absolute;
  top: calc(100% + 0.45rem);
  left: 0;
  width: min(248px, 74vw);
  display: grid;
  gap: 0.2rem;
  padding: 0.4rem;
  border: 1px solid var(--line-soft);
  border-radius: 0.8rem;
  background: var(--surface-card);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 1200;
}

.nav-kong-submenu a {
  width: 100%;
  justify-content: flex-start;
  min-height: 36px;
  padding: 0.54rem 0.68rem;
  font-size: 0.85rem;
}

.nav-kong-menu.is-open .nav-kong-submenu,
.nav-kong-menu:focus-within .nav-kong-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.mobile-nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  background: var(--mobile-toggle-bg);
  border: 1px solid var(--mobile-toggle-border);
}

.mobile-nav-toggle .bar {
  width: 18px;
  height: 2px;
  background: var(--mobile-toggle-bar);
  margin: 2px 0;
  border-radius: var(--radius-pill);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  height: 42px;
  padding: 0.52rem 0.82rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--theme-toggle-border);
  background: var(--theme-toggle-bg);
  color: var(--theme-toggle-text);
  font-weight: 700;
  font-size: 0.88rem;
  margin-left: 0.25rem;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--theme-toggle-hover-bg);
  transform: translateY(-1px);
}

.header-cta {
  margin-left: 0.25rem;
  white-space: nowrap;
}

.theme-toggle-icon {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--theme-toggle-icon), var(--theme-toggle-icon-alt));
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.theme-toggle-text {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-header {
  padding-top: clamp(2.2rem, 3.3vw, 3.3rem);
}

.breadcrumbs {
  margin-bottom: var(--space-lg);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.breadcrumb-list li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: rgba(188, 204, 248, 0.4);
}

.breadcrumb-list a {
  color: var(--text-300);
}

.breadcrumb-list span[aria-current="page"] {
  color: var(--text-100);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(1.6rem, 4.1vw, 3.8rem);
  align-items: center;
}

.hero-copy p {
  font-size: 1.06rem;
  max-width: 62ch;
}

.hero-actions {
  margin-top: var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.section-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.35rem, 3vw, 2.5rem);
}

.flow > * + * {
  margin-top: var(--space-md);
}

.site-footer {
  margin-top: var(--space-3xl);
  border-top: 1px solid var(--line-soft);
  background: var(--surface-footer);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr 0.9fr;
  gap: clamp(1.25rem, 2.5vw, 2.2rem);
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.footer-title {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

.footer-nav {
  display: grid;
  gap: 0.35rem;
}

.footer-nav a {
  color: var(--text-300);
  font-size: 0.94rem;
}

.footer-meta {
  border-top: 1px solid var(--line-soft);
  padding: var(--space-md) 0 var(--space-xl);
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.84rem;
}