/* ============================================================
   FLANGU BLOG — blog.css
   Blog-specific styles that layer on top of landing.css (tokens,
   header, footer) and docs.css (article typography, TOC sidebar,
   scroll-spy, view transitions, progress bar).

   Architecture:
     landing.css  — loaded by landing_base.html (all design tokens)
     docs.css     — loaded by blog/base.html (article typography + TOC)
     blog.css     — THIS FILE (listing, cards, category filter, etc.)

   BEM prefix: bl- (blog)
   ============================================================ */


/* ── 1. PAGE LAYOUT WRAPPER ─────────────────────────────────── */

.bl-listing {
  min-height: 60vh;
  padding-bottom: var(--sp-2xl);
}

.bl-listing__main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}


/* ── 2. LISTING HERO HEADER ─────────────────────────────────── */

.bl-listing__hero {
  padding: calc(80px + var(--sp-2xl)) var(--sp-lg) var(--sp-xl);
  max-width: 1100px;
  margin: 0 auto;
}

.bl-listing__hero-inner {
  max-width: 680px;
  margin-bottom: var(--sp-xl);
}

.bl-listing__title {
  font-family: var(--font-primary);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  color: var(--c-navy);
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 var(--sp-sm);
}

.bl-listing__subtext {
  font-family: var(--font-primary);
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.55;
  line-height: 1.65;
  margin: 0;
}

.bl-listing__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  margin-bottom: var(--sp-sm);
  font-size: 14px;
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.5;
}

.bl-listing__breadcrumb-link {
  color: var(--c-navy);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity var(--t-fast);
}

.bl-listing__breadcrumb-link:hover {
  opacity: 1;
}

.bl-listing__breadcrumb-sep {
  opacity: 0.35;
}

.bl-listing__breadcrumb-current {
  color: var(--c-navy);
}


/* ── 3. CATEGORY FILTER PILLS ───────────────────────────────── */

.bl-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-xs);
  align-items: center;
}

.bl-filter__pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--r-pill);
  font-family: var(--font-primary);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-navy);
  background: var(--c-white);
  border: 1px solid var(--c-navy-08);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background var(--t-fast),
    color var(--t-fast),
    border-color var(--t-fast),
    box-shadow var(--t-fast);
  box-shadow: var(--shadow-soft);
}

.bl-filter__pill:hover {
  border-color: var(--c-mainblue);
  color: var(--c-mainblue);
}

.bl-filter__pill.is-active {
  background: var(--c-mainblue);
  color: #fff;
  border-color: var(--c-mainblue);
  box-shadow: 0 2px 12px rgba(86, 135, 232, 0.28);
}

.bl-filter__pill:focus-visible {
  outline: 2px solid var(--c-mainblue);
  outline-offset: 3px;
}


/* ── 4. POST GRID ───────────────────────────────────────────── */

.bl-listing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (max-width: 1023px) {
  .bl-listing__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 599px) {
  .bl-listing__grid { grid-template-columns: 1fr; }
}


/* ── 5. POST CARD ───────────────────────────────────────────── */

.bl-card {
  background: var(--c-white);
  border: 1px solid var(--c-navy-08);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition:
    transform var(--t-medium) var(--ease-expo),
    box-shadow var(--t-medium) var(--ease-expo),
    border-color var(--t-medium);
}

.bl-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 32px rgba(26, 50, 98, 0.10);
  border-color: var(--c-navy-12);
}

/* Invisible full-card link overlay */
.bl-card__link {
  display: block;
  position: relative;
}

/* Cover image */
.bl-card__cover-wrap {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-whitesmoke);
}

.bl-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease-expo);
}

.bl-card:hover .bl-card__cover {
  transform: scale(1.03);
}

/* Card body */
.bl-card__body {
  padding: var(--sp-md) var(--sp-lg) var(--sp-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: var(--sp-xs);
}

/* Category pills on card */
.bl-card__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.bl-card__cat-pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-family: var(--font-primary);
  font-size: 11px;
  font-weight: 700;
  color: var(--c-mainblue);
  background: rgba(86, 135, 232, 0.08);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: background var(--t-fast);
}

.bl-card__cat-pill:hover {
  background: rgba(86, 135, 232, 0.16);
}

/* Card title */
.bl-card__title {
  font-family: var(--font-primary);
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  color: var(--c-navy);
  line-height: 1.35;
  margin: 0;
  /* Two-line clamp */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bl-card__title-link {
  color: inherit;
  text-decoration: none;
  transition: color var(--t-fast);
}

.bl-card__title-link:hover {
  color: var(--c-mainblue);
}

/* Card excerpt */
.bl-card__excerpt {
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.65;
  line-height: 1.6;
  margin: 0;
  flex: 1;
  /* Three-line clamp */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card meta row */
.bl-card__meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--sp-xs);
}

.bl-card__date,
.bl-card__reading-time {
  font-family: var(--font-primary);
  font-size: 12px;
  font-weight: 600;
  color: var(--c-navy);
  opacity: 0.45;
}

.bl-card__meta-sep {
  font-size: 12px;
  color: var(--c-navy);
  opacity: 0.3;
}


/* ── 6. PAGINATION ──────────────────────────────────────────── */

.bl-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-md);
  margin-top: var(--sp-2xl);
}

.bl-pagination__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-navy);
  background: var(--c-white);
  border: 1px solid var(--c-navy-08);
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  transition:
    background var(--t-fast),
    border-color var(--t-fast),
    color var(--t-fast);
}

.bl-pagination__btn:not(.is-disabled):hover {
  border-color: var(--c-mainblue);
  color: var(--c-mainblue);
}

.bl-pagination__btn.is-disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.bl-pagination__info {
  font-family: var(--font-primary);
  font-size: 13px;
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.5;
}


/* ── 7. EMPTY STATE ─────────────────────────────────────────── */

.bl-empty {
  text-align: center;
  padding: var(--sp-2xl) var(--sp-lg);
}

.bl-empty__text {
  font-family: var(--font-primary);
  font-size: 17px;
  color: var(--c-navy);
  opacity: 0.6;
  line-height: 1.65;
  margin: 0 0 var(--sp-lg);
}

.bl-empty__link {
  font-family: var(--font-primary);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-mainblue);
  text-decoration: none;
  transition: opacity var(--t-fast);
}

.bl-empty__link:hover {
  opacity: 0.75;
}


/* ── 8. ARTICLE LAYOUT (two-column) ────────────────────────── */

.bl-article-layout {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 0 48px;
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(80px + var(--sp-xl)) var(--sp-lg) var(--sp-2xl);
  align-items: start;
}

/* On tablet and below: single column (TOC shown in <details> at top) */
@media (max-width: 1279px) {
  .bl-article-layout {
    grid-template-columns: 1fr;
  }
}


/* ── 9. ARTICLE ELEMENT OVERRIDES ──────────────────────────── */

/* Cover hero */
.bl-article__hero-wrap {
  margin-bottom: var(--sp-xl);
  border-radius: var(--r-card);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--c-navy-08);
}

.bl-article__hero {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Article header */
.bl-article__header {
  margin-bottom: var(--sp-lg);
}

/* Meta row */
.bl-article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: var(--sp-sm);
  margin-bottom: var(--sp-md);
}

.bl-article__meta-item {
  font-family: var(--font-primary);
  font-size: 13px;
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.5;
}

.bl-article__meta-item--updated {
  font-style: italic;
}

.bl-article__meta-sep {
  font-size: 13px;
  color: var(--c-navy);
  opacity: 0.3;
}

/* Category pills row below title */
.bl-article__cats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--sp-xs);
}


/* ── 10. RIGHT TOC SIDEBAR (blog overrides to dc-otp) ──────── */

.bl-otp {
  position: sticky;
  top: calc(80px + var(--sp-lg));
  max-height: calc(100vh - 80px - var(--sp-lg) * 2);
  overflow-y: auto;
  scrollbar-width: thin;
  /* Hide on narrow viewports */
}

@media (max-width: 1279px) {
  .bl-otp {
    display: none;
  }
}


/* ── 11. SHARE BUTTON ───────────────────────────────────────── */

.bl-share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 0;
  margin: 0 0 4px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-primary);
  font-size: 13px;
  font-weight: 400;
  color: var(--c-navy);
  opacity: 0.5;
  text-align: left;
  transition: opacity var(--t-fast), color var(--t-fast);
}

.bl-share-btn:hover {
  opacity: 1;
  color: var(--c-mainblue);
}

.bl-share-btn:focus-visible {
  outline: 2px solid var(--c-mainblue);
  outline-offset: 3px;
  border-radius: 4px;
}

.bl-share-btn__text {
  transition: color var(--t-fast);
}

/* "Copied!" feedback state */
.bl-share-btn.is-copied .bl-share-btn__text::after {
  content: " — Copied!";
  color: var(--c-mainblue);
  font-weight: 600;
}


/* ── 12. RELATED ARTICLES SECTION ───────────────────────────── */

.bl-related {
  background: var(--c-whitesmoke);
  border-top: 1px solid var(--c-navy-08);
  padding: var(--sp-2xl) var(--sp-lg);
}

.bl-related__inner {
  max-width: 1100px;
  margin: 0 auto;
}

.bl-related__heading {
  font-family: var(--font-primary);
  font-size: clamp(20px, 2.5vw, 24px);
  font-weight: 700;
  color: var(--c-navy);
  letter-spacing: -0.02em;
  margin: 0 0 var(--sp-xl);
}

.bl-related__grid {
  /* Inherits .bl-listing__grid grid spec */
}


/* ── 13. RESPONSIVE ARTICLE ADJUSTMENTS ─────────────────────── */

@media (max-width: 767px) {
  .bl-article-layout {
    padding: calc(72px + var(--sp-lg)) var(--sp-md) var(--sp-xl);
  }

  .bl-listing__hero {
    padding: calc(72px + var(--sp-xl)) var(--sp-md) var(--sp-lg);
  }

  .bl-listing__hero-inner {
    margin-bottom: var(--sp-lg);
  }

  .bl-related {
    padding: var(--sp-xl) var(--sp-md);
  }

  .bl-related__heading {
    margin-bottom: var(--sp-lg);
  }
}