/* ── Variables ── */
:root {
  --clr-primary: #0071e3;
  --clr-primary-dim: #0062c4;
  --clr-accent: #0077ed;
  --clr-dark: #004aad;

  --bg-page: #f5f5f7;
  --bg-surface: #ffffff;
  --bg-surface-2: #f0f0f2;
  --bg-nav: rgba(255, 255, 255, 0.82);

  --txt-primary: #1d1d1f;
  --txt-secondary: #424245;
  --txt-muted: #86868b;

  --font-base: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --container-max: 1200px;
  --content-max: 720px;
  --nav-height: 64px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-pill: 999px;

  --border-subtle: 1px solid rgba(0, 0, 0, 0.08);
  --border-accent: 1px solid var(--clr-accent);

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-hover:
    0 12px 40px rgba(0, 113, 227, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);

  --ease-fast: 150ms ease;
  --ease-base: 250ms ease;
  --ease-slow: 400ms ease;
}

/* ── Reset ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg-page);
  color: var(--txt-primary);
  font-family: var(--font-base);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--clr-primary);
  text-decoration: none;
}
a:hover {
  color: var(--clr-primary-dim);
  text-decoration: none;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ── Accessibility ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--clr-primary);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 999;
  transition: top 0.15s;
}
.skip-link:focus {
  top: 0;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Breadcrumbs ── */
.breadcrumbs {
  margin-bottom: 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  line-height: 1;
}
.breadcrumbs a {
  color: var(--txt-muted);
  transition: color var(--ease-fast);
}
.breadcrumbs a:hover {
  color: var(--clr-primary);
}
.breadcrumbs__sep {
  margin: 0 0.5rem;
  color: var(--txt-muted);
  opacity: 0.5;
  font-size: 0.7rem;
}
.breadcrumbs [aria-current="page"] {
  color: var(--txt-secondary);
}

/* ── Layout utilities ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section {
  padding: 2rem 0;
}

/* ── Navigation ── */
.nav__checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: var(--border-subtle);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav__logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-primary);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.nav__logo:hover {
  color: var(--clr-primary-dim);
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}
.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--txt-secondary);
  position: relative;
  transition: color var(--ease-fast);
}
.nav__links a::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px;
  transition: width var(--ease-base);
}
.nav__links a:hover {
  color: var(--clr-primary);
}
.nav__links a:hover::after {
  width: 100%;
}
.nav__links .nav__link--active {
  color: var(--clr-primary);
}
.nav__links .nav__link--active::after {
  width: 100%;
}

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-shrink: 0;
}
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--txt-primary);
  border-radius: 2px;
  transition:
    transform var(--ease-base),
    opacity var(--ease-base);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 30vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--clr-dark);
  overflow: hidden;
  margin-bottom: 24px;
}
.hero__bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.15) 0%,
    rgba(0, 0, 0, 0.4) 50%,
    rgba(245, 245, 247, 0.95) 100%
  );
  z-index: 1;
}
.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 820px;
  padding: 4rem 1.5rem;
  animation: fadeSlideUp var(--ease-slow) both;
}
.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  font-weight: 700;
  color: var(--txt-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--txt-secondary);
  font-weight: 400;
  max-width: 620px;
  margin: 0 auto 2rem;
  line-height: 1.65;
}

/* ── Section title ── */
.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--txt-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--clr-accent);
  letter-spacing: -0.01em;
}

/* ── Card grid ── */
.card-grid {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.75rem;
}
.card-grid--single-column {
  grid-template-columns: 1fr;
}

/* ── Home layout ── */
.home-layout {
  display: flex;
  justify-content: space-between;
  gap: 2.5rem;
}
.home-layout__main {
  flex: 1;
  min-width: 0;
}
.home-layout__sidebar {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.home-layout__sidebar .sidebar-widget {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: var(--border-subtle);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}
.home-layout__sidebar .sidebar-widget .section-title {
  margin-bottom: 1rem;
  border-bottom: none;
  padding-bottom: 0;
}
.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.sidebar-tags__item {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--clr-primary);
  background: rgba(54, 191, 177, 0.08);
  border: 1px solid rgba(54, 191, 177, 0.2);
  border-radius: var(--radius-pill);
  transition:
    background var(--ease-fast),
    border-color var(--ease-fast);
}
.sidebar-tags__item:hover {
  background: rgba(54, 191, 177, 0.15);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

.posts {
  width: 100%;
}

/* ── Card ── */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: var(--border-subtle);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition:
    transform var(--ease-base),
    border-color var(--ease-base),
    box-shadow var(--ease-base);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 113, 227, 0.25);
  box-shadow: var(--shadow-hover);
}
.card__image-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-surface-2);
  flex-shrink: 0;
}
.card__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-slow);
}
.card:hover .card__image-wrap img {
  transform: scale(1.05);
}
.card__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--txt-muted);
}
.card__badge {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  background: rgba(255, 255, 255, 0.88);
  color: var(--clr-primary);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 113, 227, 0.2);
  backdrop-filter: blur(4px);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background var(--ease-fast);
}
.card__badge:hover {
  background: rgba(0, 113, 227, 0.1);
  color: var(--clr-primary);
}
.card__body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 1;
}
.card__title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}
.card__title a {
  color: var(--txt-primary);
  transition: color var(--ease-fast);
}
.card__title a:hover {
  color: var(--clr-primary);
}
.card__excerpt {
  color: var(--txt-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  flex: 1;
}
.card__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 0.75rem;
  border-top: var(--border-subtle);
  margin-top: auto;
}
.card__date,
.card__reading-time {
  color: var(--txt-muted);
  font-size: 0.75rem;
}

/* ── Sidebar list ── */
.sidebar-list {
  list-style: none;
}
.sidebar-list li {
  border-bottom: var(--border-subtle);
}
.sidebar-list li:last-child {
  border-bottom: none;
}
.sidebar-list__link {
  display: block;
  padding: 0.55rem 0;
  font-size: 0.875rem;
  color: var(--txt-secondary);
  transition: color var(--ease-fast);
}
.sidebar-list__link:hover {
  color: var(--clr-primary);
}
.sidebar-list--nested {
  padding-left: 1rem;
  border-left: 2px solid rgba(0, 0, 0, 0.08);
  margin: 0;
}
.sidebar-list--nested .sidebar-list__link {
  font-size: 0.82rem;
  color: var(--txt-muted);
}
.sidebar-list--nested .sidebar-list__link:hover {
  color: var(--clr-primary);
}

/* ── Post hero ── */
.post-hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
}
.post-hero img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
}

/* ── Post header ── */
.post-header {
  padding-top: 2.5rem;
}
.post-header__back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--txt-muted);
  margin-bottom: 1.5rem;
  transition: color var(--ease-fast);
}
.post-header__back:hover {
  color: var(--clr-primary);
}
.post-header__back svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}
.post-header__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--txt-primary);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}
.post-header__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--txt-muted);
  font-size: 0.85rem;
}
.post-header__meta-sep {
  color: var(--txt-muted);
  opacity: 0.4;
  user-select: none;
}
.post-badge {
  display: inline-block;
  background: rgba(0, 113, 227, 0.08);
  color: var(--clr-primary);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 113, 227, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: background var(--ease-fast);
}
.post-badge:hover {
  background: rgba(0, 113, 227, 0.15);
  color: var(--clr-primary);
}

/* ── Article body typography ── */
.article-body {
  padding-top: 2.5rem;
  padding-bottom: 3rem;
  font-size: 1.05rem;
  line-height: 1.82;
  color: var(--txt-primary);
}
.article-body > *:first-child {
  margin-top: 0;
}
.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--txt-primary);
  margin: 2.5rem 0 0.85rem;
  letter-spacing: -0.02em;
  padding-bottom: 0.4rem;
  border-bottom: var(--border-subtle);
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--clr-primary);
  margin: 2rem 0 0.65rem;
}
.article-body h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--txt-secondary);
  margin: 1.5rem 0 0.5rem;
}
.article-body p {
  margin-bottom: 1.25rem;
}
.article-body p img {
  margin: 0.75rem auto;
}
.article-body a {
  color: var(--clr-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.article-body a:hover {
  color: var(--clr-primary-dim);
}
.article-body blockquote {
  border-left: 3px solid var(--clr-primary);
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  background: rgba(0, 113, 227, 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--txt-secondary);
  font-style: italic;
}
.article-body blockquote p {
  margin: 0;
}
.article-body code {
  background: var(--bg-surface-2);
  color: var(--clr-primary);
  font-family: "Courier New", Consolas, monospace;
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: var(--border-subtle);
}
.article-body pre {
  background: var(--bg-surface-2);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.7;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--txt-primary);
  font-size: inherit;
}
.article-body ul,
.article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.article-body li {
  margin-bottom: 0.35rem;
}
.article-body ul li::marker {
  color: var(--clr-primary);
}
.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}
.article-body hr {
  border: none;
  border-top: var(--border-subtle);
  margin: 2.5rem 0;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.article-body th,
.article-body td {
  padding: 0.6rem 0.9rem;
  border: var(--border-subtle);
  text-align: left;
}
.article-body th {
  background: var(--bg-surface-2);
  color: var(--txt-secondary);
  font-weight: 600;
}

/* ── Category header ── */
.category-header {
  padding-bottom: 2rem;
  border-bottom: var(--border-subtle);
  margin-bottom: 0;
}
.category-header__label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--clr-primary);
  margin-bottom: 0.5rem;
  margin-top: 2rem;
}
.category-header__name {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--txt-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.category-header__desc {
  margin-top: 1rem;
  color: var(--txt-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* ── Author header ── */
.author-header {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: var(--border-subtle);
}
.author-header__avatar {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.author-header__bio {
  margin-top: 0.75rem;
  color: var(--txt-secondary);
  line-height: 1.6;
  max-width: var(--content-max);
}
.author-header__link {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

/* ── Authors grid ── */
.authors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}
.author-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--bg-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  transition:
    box-shadow var(--ease-base),
    border-color var(--ease-base);
  text-decoration: none;
  color: inherit;
}
.author-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--clr-primary-dim);
  color: inherit;
}
.author-card__avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}
.author-card__avatar--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-2);
  border: var(--border-subtle);
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-primary);
}
.author-card__name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--txt-primary);
  margin-bottom: 0.5rem;
}
.author-card__bio {
  font-size: 0.85rem;
  color: var(--txt-secondary);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}
.author-card__count {
  font-size: 0.78rem;
  color: var(--clr-primary);
  font-weight: 500;
}
@media (max-width: 768px) {
  .authors-grid {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .authors-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Page title ── */
.page-header__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--txt-primary);
  letter-spacing: -0.025em;
  margin-bottom: 2rem;
}

/* ── Search form ── */
.search-form {
  display: flex;
  gap: 0;
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface);
  transition: border-color var(--ease-fast);
  box-shadow: var(--shadow-card);
}
.search-form:focus-within {
  border-color: var(--clr-primary);
}
.search-form__input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.6rem 0.85rem;
  color: var(--txt-primary);
  font-family: var(--font-base);
  font-size: 0.875rem;
  outline: none;
}
.search-form__input::placeholder {
  color: var(--txt-muted);
}
.search-form__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: 0.6rem 0.75rem;
  color: var(--txt-muted);
  cursor: pointer;
  transition: color var(--ease-fast);
}
.search-form__btn:hover {
  color: var(--clr-primary);
}

/* Search page large variant */
.search-form--lg {
  max-width: var(--content-max);
  border-radius: var(--radius-md);
}
.search-form--lg .search-form__input {
  padding: 0.85rem 1rem;
  font-size: 1rem;
}
.search-form--lg .search-form__btn {
  padding: 0.85rem 1rem;
}

/* Search empty state */
.search-empty {
  text-align: center;
  padding: 4rem 1.5rem;
}
.search-empty__title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--txt-primary);
  margin-bottom: 0.5rem;
}
.search-empty__hint {
  font-size: 0.9rem;
  color: var(--txt-muted);
}

/* ── Pagination ── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding-top: 2.5rem;
}
.pagination__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--txt-secondary);
  background: var(--bg-surface);
  border: var(--border-subtle);
  transition:
    color var(--ease-fast),
    background var(--ease-fast),
    border-color var(--ease-fast);
}
.pagination__link:hover {
  color: var(--clr-primary);
  border-color: var(--clr-primary);
}
.pagination__link--active {
  color: #ffffff;
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  font-weight: 600;
}
.pagination__dots {
  color: var(--txt-muted);
  padding: 0 0.25rem;
  user-select: none;
}

/* ── Post author box ── */
.post-author-box {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: var(--border-subtle);
}
.post-author-box__inner {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition:
    border-color var(--ease-base),
    box-shadow var(--ease-base);
}
.post-author-box__inner:hover {
  border-color: var(--clr-primary-dim);
  box-shadow: var(--shadow-hover);
  color: inherit;
}
.post-author-box__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.post-author-box__avatar--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-2);
  border: var(--border-subtle);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-primary);
}
.post-author-box__label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-primary);
  margin-bottom: 0.25rem;
}
.post-author-box__name {
  display: block;
  font-size: 1.05rem;
  color: var(--txt-primary);
}
.post-author-box__bio {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--txt-secondary);
  line-height: 1.5;
}

/* ── Post tags ── */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: var(--border-subtle);
}
.post-tags__item {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--clr-primary);
  background: rgba(54, 191, 177, 0.08);
  border: 1px solid rgba(54, 191, 177, 0.2);
  border-radius: var(--radius-pill);
  transition:
    background var(--ease-fast),
    border-color var(--ease-fast);
}
.post-tags__item:hover {
  background: rgba(54, 191, 177, 0.15);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

/* ── Related posts ── */
.related {
  max-width: 960px;
  padding-top: 3rem;
  border-top: var(--border-subtle);
}
.related .card-grid {
  grid-template-columns: repeat(3, 1fr);
}

/* ── Footer ── */
.site-footer {
  background: #e8e8ed;
  border-top: var(--border-subtle);
  margin-top: 5rem;
}
.footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 4rem 1.5rem 2.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
}
.footer__col h3 {
  color: var(--txt-primary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.footer__col p,
.footer__col a {
  color: var(--txt-muted);
  font-size: 0.875rem;
  line-height: 1.85;
  display: block;
}
.footer__col a:hover {
  color: var(--clr-primary);
}
.footer__bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--txt-muted);
}

/* ── Animations ── */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }
  .nav__links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: var(--border-subtle);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--ease-base);
  }
  /* Pure CSS nav toggle via checkbox sibling combinator */
  .nav__checkbox:checked ~ .nav .nav__links {
    max-height: 420px;
  }
  .nav__checkbox:checked ~ .nav .nav__toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav__checkbox:checked ~ .nav .nav__toggle span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  .nav__checkbox:checked ~ .nav .nav__toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  .nav__links li {
    width: 100%;
  }
  .nav__links a {
    display: block;
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
    border-bottom: var(--border-subtle);
  }
  .nav__links a::after {
    display: none;
  }

  .hero {
    min-height: 50vh;
  }
  .post-hero {
    padding: 1rem 1rem 0;
  }
  .post-header {
    padding-top: 1.5rem;
  }
  .related .card-grid {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
  }
  .footer__bottom {
    flex-direction: column;
    gap: 0.35rem;
    text-align: center;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
  .home-layout {
    flex-direction: column;
  }
  .home-layout__sidebar {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .footer__inner {
    grid-template-columns: 1fr;
  }
}

/* ── Page management ── */
.manage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}

.manage-header__title {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  color: var(--txt-primary);
  margin: 0;
}

.manage-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: rgba(0, 0, 0, 0.04);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.manage-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-surface);
  gap: 1rem;
}

.manage-list__info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.manage-list__title {
  color: var(--txt-primary);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.manage-list__title:hover {
  color: var(--clr-primary);
}

.manage-list__slug {
  font-size: 0.8rem;
  color: var(--txt-muted);
  font-family: monospace;
}

.manage-list__actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.manage-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--txt-secondary);
}

.manage-confirm {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  color: var(--txt-secondary);
}

.manage-confirm strong {
  color: var(--txt-primary);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition:
    background 0.2s,
    opacity 0.2s;
  background: var(--clr-primary);
  color: #ffffff;
}

.btn:hover {
  background: var(--clr-primary-dim);
  color: #ffffff;
}

.btn--secondary {
  background: transparent;
  border: var(--border-subtle);
  color: var(--txt-secondary);
}

.btn--secondary:hover {
  color: var(--txt-primary);
  border-color: rgba(0, 0, 0, 0.15);
  background: transparent;
}

.btn--danger {
  background: #c0392b;
  color: #fff;
}

.btn--danger:hover {
  background: #a93226;
}

.btn--small {
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
}

/* ── Forms ── */
.page-form {
  max-width: 100%;
}

.form__row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.form__group--grow {
  flex: 1;
}

.form__label {
  font-size: 0.8rem;
  color: var(--txt-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.form__input,
.form__textarea {
  background: var(--bg-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--txt-primary);
  padding: 0.6rem 0.8rem;
  font-size: 0.95rem;
  font-family: var(--font-base);
  width: 100%;
  box-sizing: border-box;
  transition: border-color 0.2s;
}

.form__input:focus-visible,
.form__textarea:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
  border-color: var(--clr-primary);
}

.form__textarea {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  resize: vertical;
  min-height: 300px;
  line-height: 1.6;
}

.form__error {
  color: #e74c3c;
  font-size: 0.8rem;
}

.form__help {
  color: var(--txt-muted);
  font-size: 0.85rem;
  font-style: italic;
}

.form__details {
  margin-bottom: 1.5rem;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  background: var(--bg-surface);
}

.form__summary {
  cursor: pointer;
  color: var(--txt-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form__details[open] .form__summary {
  margin-bottom: 1rem;
}

.form__actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ── Markdown editor (split-pane) ── */
.editor {
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface);
}

.editor__tabs {
  display: flex;
  border-bottom: var(--border-subtle);
  background: var(--bg-surface-2);
}

.editor__tab {
  padding: 0.5rem 1.2rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: none;
  border: none;
  color: var(--txt-muted);
  cursor: pointer;
  transition: color 0.2s;
}

.editor__tab:hover {
  color: var(--txt-secondary);
}

.editor__tab--active {
  color: var(--clr-primary);
  box-shadow: inset 0 -2px 0 var(--clr-primary);
}

.editor__panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.editor__source {
  border-right: var(--border-subtle);
}

.editor__source .form__textarea {
  border: none;
  border-radius: 0;
  min-height: 400px;
}

.editor__preview {
  padding: 1rem 1.25rem;
  overflow-y: auto;
  max-height: 500px;
}

.editor__pane--hidden {
  display: none;
}

/* Mobile: stack editor panes */
@media (max-width: 768px) {
  .form__row {
    flex-direction: column;
  }

  .editor__panes {
    grid-template-columns: 1fr;
  }

  .editor__preview {
    display: none;
  }

  .editor__pane--hidden {
    display: none;
  }

  .editor__source.editor__pane--hidden + .editor__preview,
  .editor__preview:not(.editor__pane--hidden) {
    display: block;
  }

  .manage-list__item {
    flex-direction: column;
    align-items: flex-start;
  }

  .manage-list__actions {
    width: 100%;
  }
}

/* ── Staff FAB ── */
.admin-fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
}

.admin-fab__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  background: var(--clr-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 113, 227, 0.25);
  transition:
    background 0.2s,
    transform 0.2s;
}

.admin-fab__link:hover {
  background: var(--clr-primary-dim);
  color: #ffffff;
  transform: translateY(-2px);
}

.admin-edit-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--clr-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 0.5rem;
}

.admin-edit-link:hover {
  text-decoration: underline;
}

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