:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-muted: #555555;
  --color-border: #e5e5e5;
  --color-primary: #111111;
  --color-primary-text: #ffffff;
  --color-primary-hover: #333333;
  --font-sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-display: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --container: 42rem;
  --container-wide: 56rem;
  --radius: 0.5rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-text);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--color-text-muted);
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:focus-visible,
.lang-dropdown__toggle:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
}

p {
  margin: 0 0 var(--space-4);
}

ul,
ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.25rem;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - 2rem, var(--container-wide));
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.15rem;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-primary-text);
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  color: var(--color-primary-text);
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-primary-text);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  z-index: 10;
  text-decoration: none;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

/* Breadcrumbs */
.breadcrumbs {
  margin-bottom: var(--space-5);
  font-size: 0.875rem;
}

.breadcrumbs__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: var(--color-text-muted);
}

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-2);
  color: var(--color-border);
}

.breadcrumbs__item a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumbs__item a:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--color-text);
}

.not-found {
  padding: var(--space-6) 0 var(--space-8);
}

.not-found__title {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
}

.not-found__text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.site-footer__meta {
  display: grid;
  gap: var(--space-2);
}

.site-footer__links {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.site-footer__links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--color-text);
  text-decoration: underline;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  margin-bottom: var(--space-7);
  position: relative;
  z-index: 40;
}

.site-header__inner {
  width: min(100% - 2rem, var(--container-wide));
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "logo tools"
    "nav nav";
  align-items: center;
  column-gap: var(--space-4);
  row-gap: var(--space-3);
}

.site-logo {
  grid-area: logo;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-text);
}

.site-header__tools {
  grid-area: tools;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-self: end;
}

.site-nav {
  grid-area: nav;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3);
}

.site-nav[hidden] {
  display: none !important;
}

.site-nav__link {
  text-decoration: none;
  font-size: 1rem;
  color: var(--color-text);
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-border);
}

.site-nav__link:last-child {
  border-bottom: 0;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--color-text);
  text-decoration: underline;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 1.1rem;
  height: 0.85rem;
}

.nav-toggle__line {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.site-header.is-nav-open .nav-toggle__line:nth-child(1) {
  transform: translateY(0.3rem) rotate(45deg);
}

.site-header.is-nav-open .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.site-header.is-nav-open .nav-toggle__line:nth-child(3) {
  transform: translateY(-0.35rem) rotate(-45deg);
}

.lang-dropdown {
  position: relative;
}

.lang-dropdown__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.5rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.lang-dropdown__toggle:hover {
  border-color: #cfcfcf;
}

.lang-dropdown__code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.75rem;
  padding: 0.1rem 0.3rem;
  border-radius: 0.25rem;
  background: var(--color-primary);
  color: var(--color-primary-text);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.lang-dropdown__label {
  max-width: 6.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lang-dropdown__chevron {
  width: 0.4rem;
  height: 0.4rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.7;
}

.lang-dropdown.is-open .lang-dropdown__chevron {
  transform: rotate(-135deg) translateY(-1px);
}

.lang-dropdown__menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  z-index: 50;
  min-width: 11rem;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.lang-dropdown__menu[hidden] {
  display: none !important;
}

.lang-dropdown__option {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.55rem 0.6rem;
  border-radius: 0.35rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  box-sizing: border-box;
}

.lang-dropdown__option:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

a.lang-dropdown__option:hover {
  background: #f5f5f5;
  color: var(--color-text);
}

.lang-dropdown__option.is-current {
  font-weight: 650;
  background: #f3f3f3;
}

.lang-dropdown__option-code {
  display: inline-flex;
  min-width: 1.7rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
}

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

@media (min-width: 768px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
    grid-template-areas: "logo nav tools";
    row-gap: 0;
  }

  .site-nav {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-2) var(--space-4);
    border-top: 0;
    padding-top: 0;
  }

  .site-nav__link {
    padding: 0;
    border-bottom: 0;
    font-size: 0.95rem;
    color: var(--color-text-muted);
  }

  .nav-toggle {
    display: none;
  }

  .lang-dropdown__label {
    max-width: none;
  }
}

@media (max-width: 420px) {
  .lang-dropdown__label {
    display: none;
  }
}

/* Home */
.home-hero {
  margin-bottom: var(--space-7);
}

.home-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  margin-bottom: var(--space-3);
}

.home-hero__dek {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 36rem;
}

.home-hero__actions {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.silo-grid {
  display: grid;
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.silo-card {
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.silo-card:last-child {
  border-bottom: 0;
}

.silo-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

.silo-card__title a {
  text-decoration: none;
}

.silo-card__title a:hover {
  text-decoration: underline;
}

.silo-card__dek {
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.silo-card__link {
  font-weight: 600;
  text-decoration: none;
}

.silo-card__link:hover {
  text-decoration: underline;
}

.latest {
  margin-bottom: var(--space-8);
}

.latest__title {
  font-size: 1.35rem;
  margin-bottom: var(--space-4);
}

/* Silo + post lists */
.silo__header,
.post__header {
  margin-bottom: var(--space-6);
}

.silo__title,
.post__title {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
}

.silo__dek,
.post__dek {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

.post__silo {
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  text-transform: capitalize;
  color: var(--color-text-muted);
}

.post__silo a {
  color: inherit;
  text-decoration: none;
}

.post__silo a:hover {
  text-decoration: underline;
}

.post__date,
.post-list__date {
  display: inline;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.post__meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.post__meta-sep {
  margin: 0 0.35rem;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
}

.post-list__item {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list__item:first-child {
  border-top: 1px solid var(--color-border);
}

.post-list__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-decoration: none;
  margin-bottom: var(--space-2);
}

.post-list__title {
  font-weight: 650;
}

.post-list__excerpt {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.post-list__empty {
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
}

.post-list:not(.post-list--detailed) li {
  margin-bottom: var(--space-2);
}

/* Prose */
.prose > *:first-child {
  margin-top: 0;
}

.prose h2 {
  margin-top: var(--space-6);
  font-size: 1.35rem;
}

.prose h3 {
  margin-top: var(--space-5);
  font-size: 1.15rem;
}

.prose a {
  text-decoration: underline;
}

.prose code {
  font-size: 0.9em;
  background: #f4f4f4;
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
}

/* CTA */
.cta {
  margin: var(--space-7) 0;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta__title {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

.cta__text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* Related */
.related {
  margin: var(--space-7) 0 var(--space-8);
}

.related__title {
  font-size: 1.15rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-8);
  padding: var(--space-6) 0;
}

.site-footer__inner {
  width: min(100% - 2rem, var(--container-wide));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-footer__copy {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  max-width: 28rem;
}

.site-footer__product {
  margin: 0;
}

@media (max-width: 640px) {
  .site-header {
    margin-bottom: var(--space-6);
  }
}