/**
 * COGI main stylesheet — tokens, base, layout, components.
 */

/* -------------------------------------------------------------------------- */
/* Design tokens                                                              */
/* -------------------------------------------------------------------------- */
:root {
  --cogi-color-bg: #fcfcfc;
  --cogi-color-surface: #ffffff;
  --cogi-color-text: #0f172a;
  --cogi-color-text-muted: #64748b;
  --cogi-color-border: #e2e8f0;
  --cogi-color-border-soft: #f1f5f9;
  --cogi-color-accent-blue: #4285f4;
  --cogi-color-accent-purple: #4f46e5;
  --cogi-color-accent-rose: #d96570;
  --cogi-color-accent-green: #10b981;
  --cogi-color-accent-amber: #f59e0b;
  --cogi-color-accent-red: #ef4444;
  --cogi-color-accent-cyan: #06b6d4;
  --cogi-gradient-brand: linear-gradient(
    to right,
    var(--cogi-color-accent-blue),
    var(--cogi-color-accent-purple),
    var(--cogi-color-accent-rose)
  );

  --cogi-font-sans: "Vazirmatn", system-ui, sans-serif;
  --cogi-font-tech: "Vazirmatn", system-ui, sans-serif;

  --cogi-space-1: 4px;
  --cogi-space-2: 8px;
  --cogi-space-3: 12px;
  --cogi-space-4: 16px;
  --cogi-space-5: 24px;
  --cogi-space-6: 32px;
  --cogi-space-7: 48px;

  --cogi-radius-sm: 6px;
  --cogi-radius-md: 8px;
  --cogi-radius-lg: 16px;
  --cogi-radius-pill: 999px;

  --cogi-container: 48rem;
  --cogi-container-wide: 64rem;
  --cogi-container-home: 87.5rem;
  --cogi-header-height: 3.5rem;
  --cogi-gutter: var(--cogi-space-4);
  --cogi-popular-sticky-top: calc(
    var(--cogi-header-height) + var(--cogi-space-5)
  );

  --cogi-shadow-soft: 0 8px 24px rgba(15, 23, 42, 0.08);
  --cogi-transition: 0.25s ease;
}

[data-theme="dark"] {
  --cogi-color-bg: #0b1121;
  --cogi-color-surface: #161e31;
  --cogi-color-text: #f8fafc;
  --cogi-color-text-muted: #94a3b8;
  --cogi-color-border: #1e293b;
  --cogi-color-border-soft: #161e31;
  --cogi-color-accent-purple: #818cf8;
  --cogi-color-accent-cyan: #22d3ee;
  --cogi-shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  font-family: var(--cogi-font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--cogi-color-text);
  background: var(--cogi-color-bg);
  -webkit-font-smoothing: antialiased;
  /* Avoid theme flash repaint jump; theme is set before paint via inline script. */
  background-color: var(--cogi-color-bg);
  /* Vazirmatn stylistic set 1 → Persian digits (۰۱۲…) */
  -webkit-font-feature-settings: "ss01" 1;
  font-feature-settings: "ss01" 1;
}

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

.article-body img {
  width: 100%;
  height: auto;
  border-radius: var(--cogi-radius-md);
}

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

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

a:hover {
  color: var(--cogi-color-accent-purple);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

.skip-link {
  position: absolute;
  inset-inline-start: var(--cogi-space-4);
  top: -100%;
  z-index: 100;
  padding: var(--cogi-space-2) var(--cogi-space-4);
  border-radius: var(--cogi-radius-sm);
  background: var(--cogi-color-surface);
  color: var(--cogi-color-text);
}

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

.icon {
  display: block;
  flex-shrink: 0;
}

/* -------------------------------------------------------------------------- */
/* Layout                                                                     */
/* -------------------------------------------------------------------------- */
.container {
  width: min(100% - (var(--cogi-gutter) * 2), var(--cogi-container-wide));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - (var(--cogi-gutter) * 2), var(--cogi-container));
}

.container--home {
  width: min(100% - (var(--cogi-gutter) * 2), var(--cogi-container-home));
}

.site-main {
  padding-block: calc(var(--cogi-header-height) + var(--cogi-space-7))
    var(--cogi-space-7);
}

.site-main__shell {
  position: relative;
  min-height: 28rem;
}

.page-content {
  display: grid;
  gap: 0;
}

body.is-ready .page-content {
  animation: cogi-fade-in 0.28s ease both;
}

body.is-loading .page-content {
  opacity: 0;
  pointer-events: none;
}

/* -------------------------------------------------------------------------- */
/* Header                                                                     */
/* -------------------------------------------------------------------------- */
.scroll-progress {
  position: fixed;
  top: 0;
  inset-inline: 0 auto;
  z-index: 100;
  width: 0;
  height: 2px;
  background: linear-gradient(
    to left,
    var(--cogi-color-accent-purple),
    var(--cogi-color-accent-cyan)
  );
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--cogi-color-bg);
  border-bottom: 1px solid var(--cogi-color-border);
}

.site-header__bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--cogi-space-3);
  height: var(--cogi-header-height);
}

.site-header__start {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__end {
  display: flex;
  align-items: center;
  gap: var(--cogi-space-2);
  justify-self: end;
}

.site-header__tools {
  display: flex;
  align-items: center;
  border: 1px solid var(--cogi-color-border);
  border-radius: var(--cogi-radius-pill);
  overflow: hidden;
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.375rem;
  height: 2.375rem;
  color: var(--cogi-color-text-muted);
  background: transparent;
}

.tool-button + .tool-button {
  border-inline-start: 1px solid var(--cogi-color-border);
}

.tool-button:hover {
  color: var(--cogi-color-text);
  background: color-mix(in srgb, var(--cogi-color-border) 35%, transparent);
}

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

.icon-swap {
  position: relative;
  width: 1.25rem;
  height: 1.25rem;
  display: block;
}

.icon-swap > [data-icon] {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-swap > [data-icon="sun"],
.icon-swap > [data-icon="close"] {
  opacity: 0;
  visibility: hidden;
}

[data-theme="light"] .icon-swap > [data-icon="moon"],
[data-theme="dark"] .icon-swap > [data-icon="sun"] {
  opacity: 1;
  visibility: visible;
}

.site-header.is-menu-open .icon-swap > [data-icon="menu"] {
  opacity: 0;
  visibility: hidden;
}

.site-header.is-menu-open .icon-swap > [data-icon="close"] {
  opacity: 1;
  visibility: visible;
}

.site-header__menu-toggle {
  display: inline-flex;
  border: 1px solid var(--cogi-color-border);
  border-radius: var(--cogi-radius-pill);
}

.site-brand {
  display: inline-flex;
  align-items: flex-end;
  gap: 0.4rem;
  min-width: 0;
  line-height: 1;
  text-decoration: none;
}

.site-brand:hover {
  color: inherit;
}

.site-brand__mark {
  flex-shrink: 0;
  font-size: 0.5625rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cogi-color-text-muted);
  transform: translateY(-0.55rem);
}

.site-brand__name {
  font-size: 1.625rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cogi-color-text);
}

.site-nav {
  display: none;
}

.site-nav__list,
.mobile-nav__list,
.site-footer__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--cogi-space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__list {
  gap: var(--cogi-space-1);
}

.site-nav__list a {
  position: relative;
  display: inline-flex;
  padding: var(--cogi-space-1) var(--cogi-space-3);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--cogi-color-text-muted);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  inset-inline: var(--cogi-space-3);
  bottom: 0;
  height: 1px;
  background: currentColor;
  opacity: 0;
  transform: scaleX(0);
  transform-origin: center;
  transition:
    opacity var(--cogi-transition),
    transform var(--cogi-transition);
}

.site-nav__list .current-menu-item a,
.site-nav__list a:hover {
  color: var(--cogi-color-text);
}

.site-nav__list .current-menu-item a::after,
.site-nav__list a:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.mobile-nav {
  border-top: 1px solid var(--cogi-color-border);
  background: var(--cogi-color-bg);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav__list {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding-block: var(--cogi-space-2) var(--cogi-space-3);
}

.mobile-nav__list a {
  display: block;
  padding: var(--cogi-space-3) 0;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cogi-color-text-muted);
  border-bottom: 1px solid var(--cogi-color-border-soft);
}

.mobile-nav__list .current-menu-item a,
.mobile-nav__list a:hover {
  color: var(--cogi-color-text);
}

.mobile-nav__list li:last-child a {
  border-bottom: 0;
}

/* -------------------------------------------------------------------------- */
/* Feed & cards                                                               */
/* -------------------------------------------------------------------------- */
.reading-group {
  display: grid;
  gap: 0;
  counter-reset: cogi-feed;
}

.feed-sentinel {
  display: grid;
  place-items: center;
  min-height: 3rem;
  padding-block: var(--cogi-space-5) var(--cogi-space-7);
}

.feed-loader {
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--cogi-color-border);
  border-top-color: var(--cogi-color-text-muted);
  border-radius: 50%;
  animation: cogi-spin 0.7s linear infinite;
}

.feed-loader[hidden] {
  display: none;
}

@keyframes cogi-spin {
  to {
    transform: rotate(360deg);
  }
}

body.home .site-main {
  padding-block: calc(var(--cogi-header-height) + var(--cogi-space-5))
    var(--cogi-space-7);
}

/* -------------------------------------------------------------------------- */
/* Home layout + popular news                                                 */
/* -------------------------------------------------------------------------- */
.home-layout {
  display: grid;
  gap: var(--cogi-space-6);
  align-items: start;
}

.home-layout__main {
  min-width: 0;
}

.popular-news {
  --ticker-duration: calc(var(--ticker-items, 6) * 7s);
  min-width: 0;
  background: transparent;
}

.popular-news__label {
  display: inline-flex;
  align-items: center;
  gap: var(--cogi-space-2);
  flex-shrink: 0;
}

.popular-news__marker {
  width: 0.75rem;
  height: 2px;
  flex-shrink: 0;
  border-radius: 1px;
  background: var(--cogi-color-accent-cyan);
}

.popular-news__title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--cogi-color-text-muted);
}

.popular-news__title-short {
  display: none;
}

.popular-news__viewport {
  min-width: 0;
  overflow: hidden;
}

.popular-news__track {
  display: flex;
  width: max-content;
}

.popular-news__list {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.popular-news__item {
  position: relative;
  flex: 0 0 auto;
  border: 0;
  padding: 0;
}

.popular-news__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding-block: 1.2rem;
  color: inherit;
  transition: color var(--cogi-transition);
}

.popular-news__rank {
  align-self: start;
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  -webkit-font-feature-settings:
    "ss01" 1,
    "tnum" 1;
  font-feature-settings:
    "ss01" 1,
    "tnum" 1;
  color: var(--cogi-color-text-muted);
  opacity: 0.5;
  transition:
    color 0.3s ease,
    opacity 0.3s ease;
}

.popular-news__headline {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--cogi-color-text);
  transition:
    color 0.3s ease,
    transform 0.3s ease;
}

.popular-news__link:hover .popular-news__headline,
.popular-news__link:focus-visible .popular-news__headline {
  color: var(--cogi-color-accent-purple);
  transform: translateX(0.25rem);
}

.popular-news__link:hover .popular-news__rank,
.popular-news__link:focus-visible .popular-news__rank {
  color: var(--cogi-color-accent-purple);
  opacity: 1;
}

[data-theme="dark"] .popular-news__link:hover .popular-news__headline,
[data-theme="dark"] .popular-news__link:focus-visible .popular-news__headline,
[data-theme="dark"] .popular-news__link:hover .popular-news__rank,
[data-theme="dark"] .popular-news__link:focus-visible .popular-news__rank {
  color: var(--cogi-color-accent-cyan);
}

@keyframes cogi-ticker-scroll {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(50%, 0, 0);
  }
}

@media (min-width: 64rem) {
  .home-layout {
    grid-template-columns: minmax(0, 2fr) minmax(14rem, 1fr);
    gap: 4rem;
    align-items: start;
  }

  .home-layout__main {
    min-width: 0;
    padding-inline-end: 0;
    border-inline-end: 0;
  }

  .popular-news {
    position: sticky;
    top: var(--cogi-popular-sticky-top);
    align-self: start;
    max-height: calc(
      100vh - var(--cogi-popular-sticky-top) - var(--cogi-space-5)
    );
    overflow: auto;
    overscroll-behavior: contain;
    padding-inline-start: 2rem;
    border-inline-start: 1px solid var(--cogi-color-border);
    scrollbar-width: thin;
  }

  .popular-news__label {
    margin-bottom: 0.5rem;
  }

  .popular-news__viewport {
    overflow: visible;
    margin-top: var(--cogi-space-5);
  }

  .popular-news__track {
    display: block;
    width: auto;
    animation: none;
  }

  /* Decorative marquee clone — desktop sidebar only needs one list. */
  .popular-news__list[aria-hidden="true"] {
    display: none;
  }

  .popular-news__list {
    display: block;
  }

  .popular-news__item {
    width: auto;
    border-block-end: 1px solid var(--cogi-color-border);
  }

  .popular-news__item:last-child {
    border-block-end: 0;
  }

  .popular-news__link {
    padding-inline-end: 1.25rem;
  }

  .popular-news__headline {
    font-size: 1.1rem;
  }
}

@media (max-width: 63.99rem) {
  .popular-news {
    order: -1;
    display: flex;
    align-items: stretch;
    gap: 0;
    margin: 0 calc(-1 * var(--cogi-gutter)) var(--cogi-space-5);
    padding: 0;
    border-block: 1px solid var(--cogi-color-border);
    background: color-mix(in srgb, var(--cogi-color-surface) 72%, transparent);
  }

  .popular-news__label {
    position: relative;
    z-index: 1;
    gap: var(--cogi-space-2);
    padding-block: 0.65rem;
    padding-inline: var(--cogi-gutter) var(--cogi-space-3);
    background: var(--cogi-color-bg);
    box-shadow: calc(-1 * var(--cogi-space-4)) 0 0 0 var(--cogi-color-bg);
  }

  .popular-news__label::after {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-end: -1.25rem;
    width: 1.25rem;
    pointer-events: none;
    background: linear-gradient(to left, transparent, var(--cogi-color-bg));
  }

  [dir="rtl"] .popular-news__label::after {
    background: linear-gradient(to right, transparent, var(--cogi-color-bg));
  }

  .popular-news__marker {
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 50%;
    background: var(--cogi-color-accent-cyan);
    box-shadow: 0 0 0 3px
      color-mix(in srgb, var(--cogi-color-accent-cyan) 22%, transparent);
  }

  .popular-news__title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0;
    white-space: nowrap;
  }

  .popular-news__title-long {
    display: none;
  }

  .popular-news__title-short {
    display: inline;
  }

  .popular-news__viewport {
    flex: 1 1 auto;
    mask-image: linear-gradient(
      to left,
      transparent 0,
      #000 1rem,
      #000 calc(100% - 0.75rem),
      transparent 100%
    );
  }

  [dir="rtl"] .popular-news__viewport {
    mask-image: linear-gradient(
      to right,
      transparent 0,
      #000 1rem,
      #000 calc(100% - 0.75rem),
      transparent 100%
    );
  }

  .popular-news__track {
    align-items: center;
    animation: cogi-ticker-scroll var(--ticker-duration) linear infinite;
    will-change: transform;
  }

  .popular-news.is-paused .popular-news__track {
    animation-play-state: paused;
  }

  .popular-news__item {
    display: flex;
    align-items: center;
  }

  .popular-news__item::after {
    content: "";
    width: 3px;
    height: 3px;
    margin-inline: 1rem;
    border-radius: 50%;
    background: var(--cogi-color-text-muted);
    opacity: 0.45;
    flex-shrink: 0;
  }

  .popular-news__link {
    display: inline-flex;
    align-items: baseline;
    gap: 0.45rem;
    padding-block: 0.7rem;
    padding-inline: 0;
    white-space: nowrap;
  }

  .popular-news__rank {
    font-size: 0.72rem;
    font-weight: 800;
    line-height: 1;
    opacity: 0.55;
  }

  .popular-news__headline {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.35;
  }

  .popular-news__link:hover .popular-news__headline,
  .popular-news__link:focus-visible .popular-news__headline {
    transform: none;
  }

  .post-card__media {
    display: block;
  }

  .post-card__excerpt,
  .reading-group .post-card .post-card__excerpt {
    display: none;
  }

  .reading-group .post-card {
    padding-block: 1.75rem;
  }

  .reading-group .post-card .post-card__body {
    gap: 0.75rem;
  }

  .reading-group .post-card .post-card__title {
    font-size: clamp(1.2rem, 5.2vw, 1.55rem);
  }

  .reading-group .post-card::before {
    inset-inline-end: auto;
    inset-inline-start: 0;
    top: 0.75rem;
    transform: none;
    font-size: 5rem;
    opacity: 0.03;
  }

  .reading-group .post-card:hover::before {
    transform: none;
  }
}

.reading-group .post-card {
  position: relative;
  padding-block: 3rem;
  border-block-end: 1px solid var(--cogi-color-border);
  opacity: 0;
  transform: translateY(0.75rem);
  counter-increment: cogi-feed;
  transition:
    opacity 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.35s ease;
}

.reading-group .post-card:first-child {
  padding-top: 0;
}

.reading-group .post-card:last-child {
  border-block-end: 0;
  padding-bottom: 0;
}

.reading-group .post-card::before {
  content: counter(cogi-feed, decimal-leading-zero);
  position: absolute;
  inset-inline-end: 0;
  top: 50%;
  z-index: 0;
  transform: translateY(-50%);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cogi-color-text-muted);
  opacity: 0.04;
  pointer-events: none;
  -webkit-font-feature-settings:
    "ss01" 1,
    "tnum" 1;
  font-feature-settings:
    "ss01" 1,
    "tnum" 1;
  transition:
    transform 0.4s ease,
    opacity 0.4s ease,
    color 0.4s ease;
}

.reading-group .post-card::after {
  content: "";
  position: absolute;
  bottom: -1px;
  inset-inline-start: 0;
  width: 0;
  height: 1px;
  background: linear-gradient(
    to left,
    var(--cogi-color-accent-purple),
    transparent
  );
  transition: width 0.4s ease;
}

.reading-group .post-card:hover::before {
  transform: translateY(-50%) translateX(0.6rem);
  opacity: 0.08;
  color: var(--cogi-color-accent-purple);
}

.reading-group .post-card:hover::after {
  width: 100%;
}

.reading-group .post-card .post-card__body {
  position: relative;
  z-index: 1;
  gap: 1rem;
}

.reading-group .post-card .topic-label {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.reading-group .post-card .source-label {
  font-size: 0.8rem;
}

.reading-group .post-card .post-card__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
}

.reading-group .post-card .post-card__title a {
  display: inline-block;
  transition:
    color 0.3s ease,
    transform 0.4s ease;
}

.reading-group .post-card .post-card__excerpt {
  max-width: 100%;
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--cogi-color-text-muted);
}

@media (min-width: 64rem) {
  .reading-group .post-card .post-card__excerpt {
    max-width: 85%;
  }
}

.reading-group .post-card .post-card__meta {
  gap: 1.5rem;
  margin-top: 0.25rem;
  font-size: 0.85rem;
  justify-content: flex-end;
  width: 100%;
}

.reading-group .post-card .post-card__sep {
  opacity: 0.55;
}

.reading-group .post-card:hover .post-card__title a {
  transform: translateX(0.5rem);
}

.reading-group .post-card--ai:hover .post-card__title a {
  color: var(--cogi-color-accent-purple);
}

.reading-group
  .post-card--hardware:hover
  .post-card__title
  a,
.reading-group
  .post-card--default:hover
  .post-card__title
  a {
  color: var(--cogi-color-accent-blue);
}

.reading-group
  .post-card--software:hover
  .post-card__title
  a {
  color: var(--cogi-color-accent-green);
}

.reading-group
  .post-card--robotics:hover
  .post-card__title
  a {
  color: var(--cogi-color-accent-amber);
}

.reading-group
  .post-card--policy:hover
  .post-card__title
  a {
  color: var(--cogi-color-accent-red);
}

body.is-ready .reading-group .post-card.is-inview {
  opacity: 1;
  transform: translateY(0);
}

body.is-ready .reading-group .post-card.is-inview:nth-child(1) {
  transition-delay: 0.05s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(2) {
  transition-delay: 0.12s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(3) {
  transition-delay: 0.19s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(4) {
  transition-delay: 0.26s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(5) {
  transition-delay: 0.33s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(6) {
  transition-delay: 0.4s;
}
body.is-ready .reading-group .post-card.is-inview:nth-child(n + 7) {
  transition-delay: 0.47s;
}

body.is-ready .reading-group:hover .post-card.is-inview:not(:hover) {
  opacity: 0.3;
  transition-delay: 0s;
}

body.is-ready .reading-group .post-card.is-inview:hover {
  opacity: 1;
  filter: none;
  transform: none;
  transition-delay: 0s;
}

.post-card {
  display: block;
}

.post-card__body {
  display: grid;
  gap: var(--cogi-space-3);
  min-width: 0;
}

.post-card__media {
  display: none;
  margin: 0;
  overflow: hidden;
  border-radius: var(--cogi-radius-md);
  background: var(--cogi-color-surface);
  aspect-ratio: 16 / 9;
}

.post-card__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.post-card__meta,
.single-post__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--cogi-space-3);
  font-family: var(--cogi-font-tech);
  font-size: 0.75rem;
  color: var(--cogi-color-text-muted);
}

.post-card__read,
.single-post__read {
  display: inline-flex;
  align-items: center;
  gap: var(--cogi-space-2);
}

.topic-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.4;
  background: none;
  border: 0;
  padding: 0;
  transition:
    opacity var(--cogi-transition),
    color var(--cogi-transition);
}

.post-card__labels {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
}

.source-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--cogi-color-text-muted);
  transition: color var(--cogi-transition);
}

.source-label:hover {
  color: var(--cogi-color-text);
}

.topic-label:hover {
  opacity: 0.8;
}

.topic-label--ai {
  color: var(--cogi-color-accent-purple);
}

.topic-label--hardware,
.topic-label--default {
  color: var(--cogi-color-accent-blue);
}

.topic-label--software {
  color: var(--cogi-color-accent-green);
}

.topic-label--robotics {
  color: var(--cogi-color-accent-amber);
}

.topic-label--policy {
  color: var(--cogi-color-accent-red);
}

.post-card__title {
  margin: 0;
  font-size: clamp(1.15rem, 2.5vw, 1.5rem);
  font-weight: 700;
  line-height: 1.6;
}

.post-card__title a {
  transition: color 0.28s ease;
}

.post-card__title a:hover {
  color: var(--cogi-color-accent-purple);
}

.post-card--ai .post-card__title a:hover {
  color: var(--cogi-color-accent-purple);
}

.post-card--hardware .post-card__title a:hover,
.post-card--default .post-card__title a:hover {
  color: var(--cogi-color-accent-blue);
}

.post-card--software .post-card__title a:hover {
  color: var(--cogi-color-accent-green);
}

.post-card--robotics .post-card__title a:hover {
  color: var(--cogi-color-accent-amber);
}

.post-card--policy .post-card__title a:hover {
  color: var(--cogi-color-accent-red);
}

.post-card__excerpt {
  margin: 0;
  color: var(--cogi-color-text-muted);
  text-align: justify;
  font-weight: 400;
}

/* -------------------------------------------------------------------------- */
/* Single                                                                     */
/* -------------------------------------------------------------------------- */
.single-post {
  display: grid;
  gap: var(--cogi-space-6);
}

.single-post__header {
  display: grid;
  gap: var(--cogi-space-5);
}

.single-post--typography .single-post__header,
.single-post--typography .single-post__meta {
  justify-items: center;
  text-align: center;
  justify-content: center;
}

.single-post__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 900;
  line-height: 1.35;
}

.single-post__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--cogi-radius-lg);
  box-shadow: var(--cogi-shadow-soft);
}

.single-post__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.article-body {
  font-size: 1.125rem;
  line-height: 1.9;
  text-align: justify;
  color: color-mix(
    in srgb,
    var(--cogi-color-text) 88%,
    var(--cogi-color-text-muted)
  );
}

.article-body > *:first-child {
  margin-top: 0;
}

.article-body p {
  margin: 0 0 1.75em;
}

.article-body h2,
.article-body h3 {
  margin: 2em 0 1em;
  font-weight: 800;
  line-height: 1.4;
  color: var(--cogi-color-text);
}

.article-body h2 {
  font-size: 1.75rem;
}
.article-body h3 {
  font-size: 1.5rem;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: var(--cogi-space-4) var(--cogi-space-5);
  border-inline-start: 4px solid var(--cogi-color-accent-purple);
  border-radius: var(--cogi-radius-md);
  background: linear-gradient(
    to left,
    color-mix(in srgb, var(--cogi-color-accent-purple) 5%, transparent),
    transparent
  );
  font-size: 1.25rem;
  font-style: italic;
  color: var(--cogi-color-text-muted);
}

.single-post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cogi-space-2);
  padding-top: var(--cogi-space-6);
  border-top: 1px solid var(--cogi-color-border);
}

.share-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--cogi-space-3) var(--cogi-space-4);
  padding-block: var(--cogi-space-5);
}

.share-bar__label {
  font-size: 0.8125rem;
  color: var(--cogi-color-text-muted);
}

.share-bar__actions {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--cogi-color-border);
  border-radius: var(--cogi-radius-pill);
  overflow: hidden;
}

.share-bar__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--cogi-color-text-muted);
  background: transparent;
  transition:
    color var(--cogi-transition),
    background-color var(--cogi-transition);
}

.share-bar__button + .share-bar__button {
  border-inline-start: 1px solid var(--cogi-color-border);
}

.share-bar__button:hover {
  color: var(--cogi-color-text);
  background: color-mix(in srgb, var(--cogi-color-border) 35%, transparent);
}

.share-bar__button.is-copied {
  color: var(--cogi-color-accent-green);
}

.share-bar__button .icon {
  width: 17px;
  height: 17px;
}

.share-bar__button.is-copied [data-state="idle"],
.share-bar__button:not(.is-copied) [data-state="done"] {
  display: none;
}

.share-bar__button.is-copied [data-state="done"] {
  display: inline-flex;
}

.related-posts {
  margin-top: var(--cogi-space-7);
  padding-top: var(--cogi-space-6);
  border-top: 1px solid var(--cogi-color-border);
}

.related-posts__title {
  display: flex;
  align-items: center;
  gap: var(--cogi-space-2);
  margin: 0 0 var(--cogi-space-5);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cogi-color-text-muted);
}

.related-posts__marker {
  width: 0.75rem;
  height: 2px;
  flex-shrink: 0;
  border-radius: 1px;
  background: var(--cogi-color-accent-cyan);
}

.related-posts__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.related-posts__item {
  border-block-end: 1px solid var(--cogi-color-border);
}

.related-posts__item:last-child {
  border-block-end: 0;
}

.related-posts__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--cogi-space-4);
  align-items: start;
  padding-block: var(--cogi-space-4);
  color: inherit;
  transition: color var(--cogi-transition);
}

.related-posts__rank {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  -webkit-font-feature-settings: "ss01" 1, "tnum" 1;
  font-feature-settings: "ss01" 1, "tnum" 1;
  color: var(--cogi-color-text-muted);
  opacity: 0.5;
  transition: color 0.3s ease, opacity 0.3s ease;
}

.related-posts__body {
  display: grid;
  gap: var(--cogi-space-2);
  min-width: 0;
}

.related-posts__headline {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cogi-color-text);
  transition: color 0.3s ease, transform 0.3s ease;
}

.related-posts__time {
  font-size: 0.8125rem;
  color: var(--cogi-color-text-muted);
}

.related-posts__link:hover .related-posts__headline,
.related-posts__link:focus-visible .related-posts__headline {
  transform: translateX(0.25rem);
}

.related-posts__link:hover .related-posts__rank,
.related-posts__link:focus-visible .related-posts__rank {
  opacity: 1;
}

.related-posts__item--ai .related-posts__link:hover .related-posts__headline,
.related-posts__item--ai .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--ai .related-posts__link:hover .related-posts__rank,
.related-posts__item--ai .related-posts__link:focus-visible .related-posts__rank {
  color: var(--cogi-color-accent-purple);
}

.related-posts__item--hardware .related-posts__link:hover .related-posts__headline,
.related-posts__item--default .related-posts__link:hover .related-posts__headline,
.related-posts__item--hardware .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--default .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--hardware .related-posts__link:hover .related-posts__rank,
.related-posts__item--default .related-posts__link:hover .related-posts__rank,
.related-posts__item--hardware .related-posts__link:focus-visible .related-posts__rank,
.related-posts__item--default .related-posts__link:focus-visible .related-posts__rank {
  color: var(--cogi-color-accent-blue);
}

.related-posts__item--software .related-posts__link:hover .related-posts__headline,
.related-posts__item--software .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--software .related-posts__link:hover .related-posts__rank,
.related-posts__item--software .related-posts__link:focus-visible .related-posts__rank {
  color: var(--cogi-color-accent-green);
}

.related-posts__item--robotics .related-posts__link:hover .related-posts__headline,
.related-posts__item--robotics .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--robotics .related-posts__link:hover .related-posts__rank,
.related-posts__item--robotics .related-posts__link:focus-visible .related-posts__rank {
  color: var(--cogi-color-accent-amber);
}

.related-posts__item--policy .related-posts__link:hover .related-posts__headline,
.related-posts__item--policy .related-posts__link:focus-visible .related-posts__headline,
.related-posts__item--policy .related-posts__link:hover .related-posts__rank,
.related-posts__item--policy .related-posts__link:focus-visible .related-posts__rank {
  color: var(--cogi-color-accent-red);
}

.tag-chip {
  padding: var(--cogi-space-1) var(--cogi-space-3);
  border-radius: var(--cogi-radius-pill);
  background: color-mix(in srgb, var(--cogi-color-border) 55%, transparent);
  font-size: 0.875rem;
  color: var(--cogi-color-text-muted);
}

.tag-chip:hover {
  background: var(--cogi-color-border);
  color: var(--cogi-color-text);
}

/* -------------------------------------------------------------------------- */
/* Buttons, empty, pagination, footer                                         */
/* -------------------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--cogi-space-2) var(--cogi-space-5);
  border-radius: var(--cogi-radius-md);
  font-weight: 600;
  transition: opacity var(--cogi-transition);
}

.button--primary {
  background: var(--cogi-gradient-brand);
  color: #fff;
}

.button--primary:hover {
  opacity: 0.92;
  color: #fff;
}

.empty-state {
  display: grid;
  gap: var(--cogi-space-4);
  justify-items: start;
  padding-block: var(--cogi-space-7);
}

.empty-state__title {
  margin: 0;
  font-size: 2rem;
  font-weight: 900;
}

.empty-state__text {
  margin: 0;
  color: var(--cogi-color-text-muted);
}

.navigation.pagination {
  margin-top: var(--cogi-space-7);
}

.navigation.pagination .nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cogi-space-2);
}

.navigation.pagination a,
.navigation.pagination .current {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  min-height: 2.5rem;
  padding: var(--cogi-space-2) var(--cogi-space-3);
  border-radius: var(--cogi-radius-md);
  background: color-mix(in srgb, var(--cogi-color-border) 45%, transparent);
  font-size: 0.875rem;
}

.navigation.pagination .current {
  background: var(--cogi-color-surface);
  font-weight: 700;
}

/* Infinite scroll enhances UX; keep crawlable links in DOM for bots / no-JS. */
.has-infinite-feed .feed-pagination.is-enhanced {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-footer {
  margin-top: auto;
  padding-block: var(--cogi-space-6) var(--cogi-space-7);
  border-top: 1px solid var(--cogi-color-border);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--cogi-space-3) var(--cogi-space-6);
  /* Large-site footer: brand/© on physical left, links on right. */
  direction: ltr;
}

.site-footer__copy {
  display: inline-flex;
  align-items: center;
  gap: var(--cogi-space-2);
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--cogi-color-text-muted);
}

.site-footer__brand {
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cogi-color-text);
}

.site-footer__sep {
  opacity: 0.45;
}

.site-footer__nav {
  margin-inline-start: auto;
}

.site-footer__list {
  gap: var(--cogi-space-5);
  direction: rtl;
}

.site-footer__list a {
  font-size: 0.8125rem;
  color: var(--cogi-color-text-muted);
}

.site-footer__list a:hover {
  color: var(--cogi-color-text);
}

/* -------------------------------------------------------------------------- */
/* Feed page headers (archive / search)                                       */
/* -------------------------------------------------------------------------- */
.feed-header {
  display: grid;
  gap: var(--cogi-space-3);
  margin-bottom: var(--cogi-space-6);
  padding-bottom: var(--cogi-space-5);
  border-bottom: 1px solid var(--cogi-color-border);
}

.feed-header__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.feed-header__lead {
  margin: 0;
  max-width: 36rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--cogi-color-text-muted);
}

.feed-header__lead p {
  margin: 0;
}

.feed-header__meta {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--cogi-color-text-muted);
}

.feed-header--search {
  gap: var(--cogi-space-4);
}

.feed-header--search .search-panel {
  margin: 0;
}

/* -------------------------------------------------------------------------- */
/* Search                                                                     */
/* -------------------------------------------------------------------------- */
.search-panel {
  display: grid;
  gap: var(--cogi-space-3);
  width: 100%;
}

.search-panel__field {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: var(--cogi-space-3);
  min-height: 3rem;
  padding: var(--cogi-space-2) var(--cogi-space-4);
  border: 1px solid var(--cogi-color-border);
  border-radius: var(--cogi-radius-md);
  background: var(--cogi-color-surface);
}

.search-panel__icon {
  display: inline-flex;
  color: var(--cogi-color-text-muted);
}

.search-panel__input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--cogi-color-text);
  font: inherit;
  font-size: 1rem;
  outline: none;
}

.search-panel__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

.search-panel__submit {
  width: 100%;
  min-height: 3rem;
  padding-inline: var(--cogi-space-4);
  border: 1px solid var(--cogi-color-border);
  background: transparent;
  color: var(--cogi-color-text);
  font-weight: 600;
}

.search-panel__submit:hover {
  background: color-mix(in srgb, var(--cogi-color-border) 40%, transparent);
  opacity: 1;
}

/* -------------------------------------------------------------------------- */
/* Skeleton                                                                   */
/* -------------------------------------------------------------------------- */
.page-skeleton {
  position: absolute;
  inset-inline: 0;
  top: 0;
  width: 100%;
  z-index: 1;
  gap: var(--cogi-space-7);
  pointer-events: none;
}

.page-skeleton__intro,
.page-skeleton__single,
.page-skeleton__empty,
.page-skeleton__card-body {
  display: grid;
  gap: var(--cogi-space-3);
}

.page-skeleton__intro {
  padding-bottom: var(--cogi-space-6);
  margin-bottom: var(--cogi-space-2);
  border-bottom: 1px solid var(--cogi-color-border);
}

.page-skeleton__list {
  display: grid;
  gap: 0;
}

.page-skeleton__home {
  display: grid;
  gap: var(--cogi-space-6);
}

.page-skeleton__popular {
  display: none;
  gap: var(--cogi-space-3);
}

@media (max-width: 63.99rem) {
  .page-skeleton__home {
    gap: var(--cogi-space-5);
  }

  .page-skeleton__popular {
    order: -1;
    display: flex;
    align-items: center;
    gap: var(--cogi-space-3);
    margin: 0 calc(-1 * var(--cogi-gutter));
    padding: 0.75rem var(--cogi-gutter);
    border-block: 1px solid var(--cogi-color-border);
  }

  .page-skeleton__popular .skel--meta {
    width: 4.5rem;
    flex-shrink: 0;
  }

  .page-skeleton__popular .skel--line {
    flex: 1 1 auto;
    margin: 0;
  }

  .page-skeleton__popular .skel--line:nth-child(n + 3) {
    display: none;
  }
}

@media (min-width: 64rem) {
  .page-skeleton__home {
    grid-template-columns: minmax(0, 2fr) minmax(14rem, 1fr);
    gap: 4rem;
    align-items: start;
  }

  .page-skeleton__list {
    padding-inline-end: 0;
    border-inline-end: 0;
  }

  .page-skeleton__popular {
    display: grid;
    padding-inline-start: 2rem;
    border-inline-start: 1px solid var(--cogi-color-border);
  }
}

.page-skeleton__card {
  display: block;
  padding-block: var(--cogi-space-6);
  border-block-end: 1px solid
    color-mix(in srgb, var(--cogi-color-border) 65%, transparent);
}

.page-skeleton__card:first-child {
  padding-top: 0;
}

.page-skeleton__card:last-child {
  border-block-end: 0;
  padding-bottom: 0;
}

.skel {
  display: block;
  border-radius: var(--cogi-radius-md);
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--cogi-color-border) 70%, transparent) 0%,
    color-mix(
        in srgb,
        var(--cogi-color-border-soft) 90%,
        var(--cogi-color-surface)
      )
      45%,
    color-mix(in srgb, var(--cogi-color-border) 70%, transparent) 100%
  );
  background-size: 200% 100%;
  animation: cogi-shimmer 1.2s ease-in-out infinite;
}

.skel--meta {
  width: 11rem;
  height: 0.85rem;
}

.skel--title {
  width: min(100%, 22rem);
  height: 1.5rem;
}

.skel--title-lg {
  width: min(100%, 28rem);
  height: 2.5rem;
}

.skel--line {
  width: 100%;
  height: 0.85rem;
}

.skel--w-40 {
  width: 40%;
}
.skel--w-60 {
  width: 60%;
}
.skel--w-70 {
  width: 70%;
}
.skel--w-80 {
  width: 80%;
}

.page-skeleton__card-media {
  display: none;
  margin-block: 0;
  border-radius: var(--cogi-radius-md);
}

@media (max-width: 63.99rem) {
  .page-skeleton__card-media {
    display: block;
  }

  .page-skeleton__card-body > .skel--line {
    display: none;
  }
}

.skel--search {
  width: 100%;
  height: 3.25rem;
  border-radius: var(--cogi-radius-lg);
}

.skel--button {
  width: 9rem;
  height: 2.75rem;
}

/* -------------------------------------------------------------------------- */
/* Motion                                                                     */
/* -------------------------------------------------------------------------- */
@keyframes cogi-shimmer {
  0% {
    background-position: 100% 0;
  }
  100% {
    background-position: -100% 0;
  }
}

@keyframes cogi-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@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;
  }

  .reading-group .post-card,
  body.is-ready .reading-group .post-card.is-inview,
  body.is-ready .reading-group:hover .post-card.is-inview:not(:hover),
  body.is-ready .reading-group .post-card.is-inview:hover {
    opacity: 1;
    filter: none;
    transform: none;
  }

  body.is-ready .page-content {
    animation: none;
    opacity: 1;
  }

  .popular-news__track {
    animation: none !important;
    transform: none !important;
  }

  @media (max-width: 63.99rem) {
    .popular-news__viewport {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }

    .popular-news__viewport::-webkit-scrollbar {
      display: none;
    }

    .popular-news__list[aria-hidden="true"] {
      display: none;
    }
  }

  .popular-news__link:hover .popular-news__headline,
  .popular-news__link:focus-visible .popular-news__headline,
  .reading-group .post-card:hover .post-card__title a,
  .reading-group .post-card:hover::before {
    transform: none;
  }

  .related-posts__link:hover .related-posts__headline,
  .related-posts__link:focus-visible .related-posts__headline {
    transform: none;
  }
}

/* -------------------------------------------------------------------------- */
/* Breakpoints                                                                */
/* -------------------------------------------------------------------------- */
@media (min-width: 48rem) {
  :root {
    --cogi-gutter: var(--cogi-space-5);
  }

  .site-header__bar {
    grid-template-columns: 1fr auto 1fr;
    gap: var(--cogi-space-5);
  }

  .site-header__start {
    justify-self: start;
  }

  .site-nav {
    display: block;
    justify-self: center;
  }

  .site-header__end {
    justify-self: end;
  }

  .site-header__menu-toggle,
  .mobile-nav {
    display: none !important;
  }

  .search-panel {
    grid-template-columns: 1fr auto;
    align-items: stretch;
  }

  .search-panel__submit {
    width: auto;
    min-width: 8.5rem;
  }
}