/* ==========================================
   Blog (index and article pages)
   Loaded by lib/features/blog/ui. Shared primitives live in ui.css.
   ========================================== */

/* ---------- Index hero ---------- */
.blog-hero {
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.blog-hero .ui-hero__glow {
  left: var(--mx, 50%);
  top: var(--my, 30%);
}

.blog-hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 50rem;
  margin-inline: auto;
  text-align: center;
}

.blog-hero .ui-hero__body {
  margin-inline: auto;
  margin-bottom: 0;
}

/* ---------- Filter ---------- */
.blog-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.blog-filter__chip {
  padding: 0.65rem 1.15rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-text-main);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s, transform 0.4s var(--ui-ease);
}

.blog-filter__chip:hover {
  border-color: var(--color-text-main);
  transform: translateY(-2px);
}

.blog-filter__chip[aria-pressed="true"] {
  border-color: var(--color-black);
  background: var(--color-black);
  color: var(--color-primary);
}

:root[data-theme="dark"] .blog-filter__chip[aria-pressed="true"] {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-black);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .blog-filter__chip[aria-pressed="true"] {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-black);
  }
}

/* ---------- Cards ---------- */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.blog-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--ui-line);
  border-radius: 1.75rem;
  background: var(--ui-card);
  color: var(--color-text-main);
  text-decoration: none;
  transition: transform 0.5s var(--ui-ease), box-shadow 0.5s var(--ui-ease), border-color 0.3s;
}

.blog-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--ui-shadow-lg);
}

.blog-card[hidden] {
  display: none;
}

.blog-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
}

.blog-card__tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.blog-card__featured {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--color-error);
}

.blog-card__featured .ui-icon {
  width: 0.9rem;
  height: 0.9rem;
}

.blog-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.blog-card__excerpt {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.blog-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--ui-line);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.blog-card__meta > span:not(.blog-card__arrow) {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.blog-card__meta .ui-icon {
  width: 0.95rem;
  height: 0.95rem;
}

.blog-card__arrow {
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  margin-left: auto;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-black);
  transition: transform 0.5s var(--ui-ease);
}

.blog-card:hover .blog-card__arrow {
  transform: rotate(45deg);
}

.blog-card--featured {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
}

.blog-card--featured .blog-card__body {
  justify-content: center;
  gap: 1rem;
  padding: clamp(1.75rem, 4vw, 3rem);
}

.blog-card--featured .blog-card__title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.blog-card--featured .blog-card__excerpt {
  font-size: 1.02rem;
}

.blog-card--featured .blog-card__meta {
  margin-top: 0.5rem;
}

/* Typographic cover art. */
.blog-cover {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  isolation: isolate;
  background: var(--color-primary);
  color: var(--color-black);
}

.blog-cover--large {
  aspect-ratio: auto;
  min-height: 18rem;
}

.blog-cover--grammar {
  background: linear-gradient(145deg, #ffd24d, var(--color-primary) 55%, #ff9a1f);
}

.blog-cover--tips {
  background: linear-gradient(145deg, #2a2a33, var(--color-black));
  color: var(--color-primary);
}

.blog-cover--exams {
  background: linear-gradient(145deg, #ff8a4c, var(--color-error));
  color: var(--color-white);
}

.blog-cover--culture {
  background: linear-gradient(145deg, #3dd6c4, var(--color-success));
  color: var(--color-black);
}

.blog-cover--relocation {
  background: linear-gradient(145deg, #f4f2fc, #d9d4f2);
  color: var(--color-black);
}

.blog-cover__ring {
  position: absolute;
  width: 70%;
  aspect-ratio: 1;
  border: 2px dashed currentColor;
  border-radius: 50%;
  opacity: 0.25;
  animation: ui-spin 50s linear infinite;
}

.blog-cover__word {
  position: relative;
  padding: 0 1rem;
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  text-align: center;
  transition: transform 0.8s var(--ui-ease);
}

.blog-cover--large .blog-cover__word {
  font-size: clamp(2.6rem, 7vw, 5.5rem);
}

.blog-card:hover .blog-cover__word {
  transform: scale(1.06) rotate(-2deg);
}

.blog-cover__bee {
  position: absolute;
  right: 8%;
  bottom: 10%;
  width: 3.5rem;
  height: auto;
  animation: ui-wobble 3s ease-in-out infinite;
}

.blog-cover--large .blog-cover__bee {
  width: 5rem;
}

/* ---------- Article ---------- */
.blog-article__hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
  width: min(100%, calc(var(--container-max-width) + 2 * var(--page-gutter)));
  margin-inline: auto;
}

.blog-article__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.blog-article__back {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.3s;
}

.blog-article__back:hover {
  color: var(--color-text-main);
}

.blog-article__back .ui-icon {
  width: 1rem;
  height: 1rem;
  transition: transform 0.4s var(--ui-ease);
}

.blog-article__back:hover .ui-icon {
  transform: translateX(-4px);
}

.blog-article__title {
  font-size: clamp(2rem, 4.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.blog-article__lead {
  max-width: 38rem;
  font-size: 1.12rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

.blog-article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.blog-article__meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.blog-article__meta .ui-icon {
  width: 1rem;
  height: 1rem;
}

.blog-article__hero .blog-cover {
  border-radius: var(--ui-radius-2xl);
}

.blog-article__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20rem;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  width: min(calc(100% - 2 * var(--page-gutter)), var(--container-max-width));
  padding-block: clamp(1rem, 3vw, 2rem) var(--ui-section-y);
}

.blog-article__body {
  max-width: 44rem;
}

.blog-article__body p {
  margin: 0 0 1.35rem;
  font-size: 1.12rem;
  line-height: 1.8;
  color: var(--color-text-main);
}

.blog-article__body p:first-child::first-letter {
  float: left;
  margin: 0.35rem 0.6rem 0 0;
  font-size: 4rem;
  font-weight: 800;
  line-height: 0.8;
  color: var(--color-error);
}

.blog-article__subtitle {
  position: relative;
  margin: 2.5rem 0 1rem;
  padding-left: 1.1rem;
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.blog-article__subtitle::before {
  content: '';
  position: absolute;
  top: 0.15em;
  bottom: 0.15em;
  left: 0;
  width: 0.3rem;
  border-radius: 1rem;
  background: var(--color-primary);
}

.blog-aside {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.75rem;
  border-radius: 1.75rem;
  background: var(--ui-ink);
  color: var(--color-white);
}

.blog-aside__bee {
  width: 4rem;
  height: auto;
  animation: ui-bob 5s ease-in-out infinite;
}

.blog-aside__title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.blog-aside__text {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.blog-related__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.blog-related__title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.blog-related__all {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 800;
  color: var(--color-text-main);
  text-decoration: none;
  background-image: linear-gradient(var(--color-primary), var(--color-primary));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 0.3em;
  transition: background-size 0.4s var(--ui-ease);
}

.blog-related__all:hover {
  background-size: 100% 100%;
}

.blog-related__all .ui-icon {
  width: 1rem;
  height: 1rem;
}

/* ---------- Telegram channel band ---------- */
.blog-channel {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.blog-channel .ui-heading {
  margin-bottom: 2rem;
}

.blog-channel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.blog-channel__bubbles {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.blog-channel__bubble {
  padding: 0.85rem 1.25rem;
  border-radius: 1.25rem 1.25rem 1.25rem 0.3rem;
  background: rgba(255, 255, 255, 0.08);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 800;
  animation: ui-bob 6s ease-in-out infinite;
}

.blog-channel__bubble:nth-child(2) {
  align-self: flex-end;
  border-radius: 1.25rem 1.25rem 0.3rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-black);
  animation-delay: -1.5s;
}

.blog-channel__bubble:nth-child(3) {
  margin-left: 2rem;
  animation-delay: -3s;
}

.blog-channel__bubble:nth-child(4) {
  align-self: flex-end;
  border-radius: 1.25rem 1.25rem 0.3rem 1.25rem;
  background: var(--color-error);
  animation-delay: -4.5s;
}

/* ---------- Responsive ---------- */
@media (max-width: 64rem) {
  .blog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .blog-article__hero,
  .blog-article__layout,
  .blog-channel {
    grid-template-columns: 1fr;
  }

  .blog-aside {
    position: static;
    max-width: 30rem;
  }
}

@media (max-width: 48rem) {
  .blog-grid,
  .blog-card--featured {
    grid-template-columns: 1fr;
  }

  .blog-cover--large {
    min-height: 13rem;
  }

  .blog-filter {
    flex-wrap: nowrap;
    justify-content: flex-start;
    margin-inline: calc(-1 * var(--page-gutter));
    padding: 0.25rem var(--page-gutter);
    overflow-x: auto;
    scrollbar-width: none;
  }

  .blog-filter::-webkit-scrollbar {
    display: none;
  }

  .blog-filter__chip {
    flex-shrink: 0;
  }

  .blog-article__body p {
    font-size: 1.04rem;
  }
}