/* =============================================
   BLOG.CSS — Blog index, category pages, post pages
   All colours use base.css variables.
   body.dark overrides only for gradients and values
   genuinely outside the token system.
   ============================================= */

/* ---- BLOG HERO ---- */
.blog-hero {
  padding: 80px 0 0;
  background: linear-gradient(160deg, var(--color-bg-alt) 0%, var(--color-tag-blue-bg) 100%);
}
body.dark .blog-hero {
  background: linear-gradient(160deg, #0f172a 0%, #0a1f44 100%);
}
.blog-hero-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 max(8%, 24px) 72px;
}
.blog-hero h1 {
  font-size: 52px; font-weight: 800;
  max-width: 680px; line-height: 1.1; margin-bottom: 20px;
  color: var(--color-text);
}
.blog-hero p {
  font-size: 18px; opacity: 0.72;
  max-width: 580px; line-height: 1.75;
}
body.dark .blog-hero p { color: var(--color-tag-gray-text); opacity: 1; }

/* ---- CATEGORY CARDS ---- */
.blog-cat-cards-section { padding: 56px 0; }
.blog-cat-cards-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 max(8%, 24px);
}

.blog-cat-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 24px;
}

.blog-cat-card {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 22px; border: 1px solid var(--color-border);
  border-radius: 16px; background: var(--color-bg);
  cursor: pointer; user-select: none;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
body.dark .blog-cat-card {
  border-color: var(--color-border-card); background: var(--color-bg-card);
}
.blog-cat-card:hover {
  border-color: var(--color-brand);
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(37,99,235,0.1);
}
body.dark .blog-cat-card:hover { box-shadow: 0 10px 28px rgba(37,99,235,0.18); }

.blog-cat-card-icon { font-size: 26px; flex-shrink: 0; line-height: 1; margin-top: 2px; }

.blog-cat-card-info { flex: 1; min-width: 0; }
.blog-cat-card-info h2 {
  font-size: 14px; font-weight: 800; margin-bottom: 5px;
  color: var(--color-text);
}
.blog-cat-card-info p {
  font-size: 12px; opacity: 0.68; line-height: 1.6; margin-bottom: 10px;
}
body.dark .blog-cat-card-info p { color: var(--color-tag-gray-text); opacity: 1; }

.blog-cat-card-meta {
  display: flex; align-items: center; justify-content: space-between;
}
.blog-cat-card-count { font-size: 11px; color: var(--color-brand); font-weight: 600; }
.blog-cat-card-arrow { font-size: 13px; opacity: 0.35; transition: opacity 0.2s, transform 0.2s; }
.blog-cat-card:hover .blog-cat-card-arrow { opacity: 1; transform: translateX(3px); }

/* ---- SCROLL ANCHOR ---- */
#blogListAnchor { scroll-margin-top: 80px; }

/* =============================================
   BLOG INDEX — SIDEBAR LAYOUT
   ============================================= */
.blog-index-section { padding: 0 0 100px; }
.blog-index-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 max(4%, 16px);
}

.blog-index-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  align-items: flex-start;
}

/* ---- CATEGORY SIDEBAR ---- */
.blog-cat-sidebar {
  border-right: 1px solid var(--color-border);
  padding: 40px 0;
  position: sticky;
  top: 65px;
  max-height: calc(80vh - 65px);
  overflow-y: auto;
  align-self: flex-start;
}
body.dark .blog-cat-sidebar { border-color: var(--color-border-card); }

.blog-cat-sidebar-title {
  font-size: 10px; letter-spacing: 3px;
  font-weight: 800; color: var(--color-brand);
  padding: 0 20px 16px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 8px;
}
body.dark .blog-cat-sidebar-title { border-color: var(--color-border-card); }

.blog-cat-btn {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 12px 20px;
  background: none; border: none;
  text-align: left; cursor: pointer;
  font-size: 14px; font-weight: 500;
  color: var(--color-text); opacity: 0.7;
  transition: background 0.2s, opacity 0.2s, color 0.2s;
  font-family: inherit;
}
.blog-cat-btn:hover { background: var(--color-tag-gray-bg); opacity: 1; }
body.dark .blog-cat-btn:hover { background: #1e293b; opacity: 1; }

.blog-cat-btn.active {
  background: var(--color-tag-blue-bg); color: var(--color-brand);
  opacity: 1; font-weight: 700;
  border-right: 3px solid var(--color-brand);
}
body.dark .blog-cat-btn.active {
  background: var(--color-tag-blue-bg); color: var(--color-brand-muted);
  border-color: var(--color-brand-muted);
}
.blog-cat-btn-icon { font-size: 16px; flex-shrink: 0; }
.blog-cat-btn-count {
  margin-left: auto; font-size: 11px;
  background: var(--color-border); color: var(--color-tag-gray-text);
  padding: 1px 7px; border-radius: 20px; font-weight: 600;
}
body.dark .blog-cat-btn-count { background: var(--color-border-card); }
.blog-cat-btn.active .blog-cat-btn-count {
  background: #dbeafe; color: var(--color-brand-hover);
}
body.dark .blog-cat-btn.active .blog-cat-btn-count {
  background: var(--color-tag-blue-bg); color: var(--color-tag-blue-text);
}

/* ---- BLOG CONTENT AREA ---- */
.blog-content-area { padding: 40px 40px; }

.blog-content-cat-header {
  position: sticky; top: 65px;
  background: var(--color-bg);
  z-index: 10;
  padding: 20px 0 16px;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 24px;
}
body.dark .blog-content-cat-header { border-color: var(--color-border-card); }

.blog-content-cat-header-inner {
  display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.blog-content-cat-name {
  font-size: 22px; font-weight: 800;
  display: flex; align-items: center; gap: 10px;
  color: var(--color-text);
}
.blog-content-cat-icon { font-size: 24px; }

.blog-cat-all-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700;
  color: var(--color-brand); text-decoration: none;
  padding: 7px 14px; border: 1.5px solid var(--color-brand);
  border-radius: 8px; transition: background 0.2s;
}
.blog-cat-all-link:hover { background: var(--color-tag-blue-bg); }
body.dark .blog-cat-all-link { color: var(--color-brand-muted); border-color: var(--color-brand-muted); }
body.dark .blog-cat-all-link:hover { background: var(--color-tag-blue-bg); }

/* ---- POST LIST ---- */
.blog-post-list { display: flex; flex-direction: column; gap: 0; }

/* Scrollable panel — blog index only.
   Portrait (vertical > horizontal): 65vh cap.
   Landscape (horizontal > vertical): 80vh cap.
   Category pages are unaffected (they use .blog-cat-post-grid). */
.blog-content-area .blog-post-list {
  overflow-y: auto;
  max-height: 65vh;
  -webkit-overflow-scrolling: touch;
}
@media (orientation: landscape) {
  .blog-content-area .blog-post-list {
    max-height: 80vh;
  }
}

.blog-post-list[hidden] {
    display: none !important;
}

.blog-post-item {
  display: block; text-decoration: none; color: inherit;
  padding: 18px 0; border-bottom: 1px solid var(--color-border);
}
body.dark .blog-post-item { border-color: var(--color-border-card); }
.blog-post-item:last-child { border-bottom: none; }
.blog-post-item:hover .blog-post-title { color: var(--color-brand); }

.blog-post-item-top {
  display: flex; align-items: baseline;
  gap: 10px; margin-bottom: 4px; flex-wrap: wrap;
}
.blog-post-title {
  font-size: 15px; font-weight: 700;
  line-height: 1.3; transition: color 0.15s;
  color: var(--color-text);
}
.blog-post-date { font-size: 12px; font-style: italic; opacity: 0.5; white-space: nowrap; flex-shrink: 0; }
body.dark .blog-post-date { color: var(--color-tag-gray-text); opacity: 1; }
.blog-post-desc { font-size: 13px; opacity: 0.68; line-height: 1.6; }
body.dark .blog-post-desc { color: var(--color-tag-gray-text); opacity: 1; }

/* =============================================
   CATEGORY PAGE
   ============================================= */
.blog-cat-page-hero {
  padding: 56px 0 0;
  background: linear-gradient(160deg, var(--color-bg-alt) 0%, var(--color-tag-blue-bg) 100%);
}
body.dark .blog-cat-page-hero {
  background: linear-gradient(160deg, #0f172a 0%, #0a1f44 100%);
}
.blog-cat-page-hero-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 max(8%, 24px) 56px;
}

.blog-breadcrumb {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600;
  color: var(--color-brand); margin-bottom: 24px;
  text-decoration: none; transition: opacity 0.2s;
}
.blog-breadcrumb:hover { opacity: 0.75; }

.blog-cat-page-meta { display: flex; gap: 20px; align-items: flex-start; }
.blog-cat-page-icon { font-size: 48px; flex-shrink: 0; line-height: 1; }

.blog-cat-page-meta h1 {
  font-size: 42px; font-weight: 800;
  line-height: 1.1; margin-bottom: 10px;
  color: var(--color-text);
}
.blog-cat-page-meta p { font-size: 16px; opacity: 0.7; max-width: 520px; }
body.dark .blog-cat-page-meta p { color: var(--color-tag-gray-text); opacity: 1; }

.blog-cat-page-section { padding: 48px 0 100px; }
.blog-cat-page-inner {
  max-width: 860px; margin: 0 auto;
  padding: 0 max(8%, 24px);
}

.blog-cat-post-grid { display: flex; flex-direction: column; gap: 16px; }

.blog-cat-post-card {
  display: block; text-decoration: none; color: inherit;
  padding: 24px 28px; border: 1px solid var(--color-border);
  border-radius: 14px; background: var(--color-bg);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
body.dark .blog-cat-post-card { border-color: var(--color-border-card); background: var(--color-bg-card); }
.blog-cat-post-card:hover {
  border-color: var(--color-brand); transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.09);
}

.blog-cat-post-card-top {
  display: flex; align-items: baseline;
  justify-content: space-between; gap: 12px;
  margin-bottom: 6px; flex-wrap: wrap;
}
.blog-cat-post-card h2 {
  font-size: 17px; font-weight: 800; line-height: 1.3; flex: 1;
  color: var(--color-text);
}
.blog-cat-post-card-date { font-size: 12px; font-style: italic; opacity: 0.5; white-space: nowrap; flex-shrink: 0; }
body.dark .blog-cat-post-card-date { color: var(--color-tag-gray-text); opacity: 1; }
.blog-cat-post-card p { font-size: 14px; opacity: 0.72; line-height: 1.7; }
body.dark .blog-cat-post-card p { color: var(--color-tag-gray-text); opacity: 1; }

/* Empty state on category pages */
.blog-cat-empty {
  padding: 48px 24px; text-align: center;
  border: 1px dashed var(--color-border); border-radius: 14px;
}
body.dark .blog-cat-empty { border-color: var(--color-border-card); }
.blog-cat-empty .empty-icon { font-size: 36px; margin-bottom: 12px; }
.blog-cat-empty p { font-size: 15px; opacity: 0.5; }

/* ---- PRE-RENDERED PANEL EMPTY STATE ---- */
.blog-cat-empty-state {
  padding: 40px 24px; text-align: center; opacity: 0.5; font-size: 15px;
}
.blog-cat-empty-state p:first-child { font-size: 28px; margin-bottom: 10px; }

/* ---- CATEGORY CARD ACTIVE STATE ---- */
.blog-cat-card.active {
  border-color: var(--color-brand);
  box-shadow: 0 10px 28px rgba(37,99,235,0.1);
}
body.dark .blog-cat-card.active { box-shadow: 0 10px 28px rgba(37,99,235,0.18); }

/* ---- TOPIC CARD (groups multiple posts under one subject) ---- */
.blog-cat-topic-card {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 28px; border: 1px solid var(--color-border);
  border-radius: 14px; background: var(--color-bg);
  text-decoration: none; color: inherit; gap: 16px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
body.dark .blog-cat-topic-card { border-color: var(--color-border-card); background: var(--color-bg-card); }
.blog-cat-topic-card:hover {
  border-color: var(--color-brand); transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.09);
}
.blog-cat-topic-card-left { flex: 1; min-width: 0; }
.blog-cat-topic-card-icon { font-size: 20px; margin-bottom: 6px; }
.blog-cat-topic-card h2 { font-size: 17px; font-weight: 800; margin-bottom: 4px; color: var(--color-text); }
.blog-cat-topic-card p { font-size: 13px; opacity: 0.68; line-height: 1.6; }
body.dark .blog-cat-topic-card p { color: var(--color-tag-gray-text); opacity: 1; }
.blog-cat-topic-badge {
  font-size: 12px; font-weight: 700; white-space: nowrap; flex-shrink: 0;
  color: var(--color-brand); background: var(--color-tag-blue-bg);
  padding: 4px 12px; border-radius: 20px;
}
.blog-cat-topic-arrow { font-size: 18px; opacity: 0.4; flex-shrink: 0; transition: opacity 0.2s, transform 0.2s; }
.blog-cat-topic-card:hover .blog-cat-topic-arrow { opacity: 1; transform: translateX(4px); }

/* =============================================
   MOBILE — COLLAPSIBLE SIDEBAR
   ============================================= */
.blog-mobile-cat-toggle {
  display: none;
  width: 100%; padding: 14px max(5%, 16px);
  background: var(--color-bg); border: none;
  border-bottom: 1px solid var(--color-border);
  font-size: 30px; font-weight: 700;
  color: var(--color-brand); cursor: pointer;
  text-align: left;
  position: sticky; top: 65px; z-index: 20;
  font-family: inherit;
}
body.dark .blog-mobile-cat-toggle { border-color: var(--color-border-card); color: var(--color-brand-muted); }

/* z-index 1100 — above navbar (1000) so it isn't clipped */
.blog-mobile-cat-drawer {
  display: none;
  position: fixed; top: 75px; left: 0; right: 0; bottom: 0;
  z-index: 999;
}
.blog-mobile-cat-drawer.open { display: block; }

.blog-mobile-cat-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.5); }

.blog-mobile-cat-panel {
  position: absolute; left: 0; top: 0px; bottom: 0;
  width: 280px; max-width: 80vw;
  background: var(--color-bg); overflow-y: auto;
  padding: 24px 0;
}

.blog-mobile-cat-panel-title {
  font-size: 10px; letter-spacing: 3px;
  font-weight: 800; color: var(--color-brand);
  padding: 0 20px 16px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 8px;
}
body.dark .blog-mobile-cat-panel-title { border-color: var(--color-border-card); }

.blog-mobile-close {
  position: absolute; top: 16px; right: 16px;
  background: none; border: none;
  font-size: 22px; cursor: pointer;
  color: var(--color-text); font-family: inherit;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .blog-cat-cards-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .blog-index-layout { grid-template-columns: 1fr; }
  .blog-cat-sidebar { display: none; }
  .blog-mobile-cat-toggle { display: flex; align-items: center; justify-content: space-between; }
  .blog-content-area { padding: 24px max(5%, 16px); }
  .blog-content-cat-header { top: calc(65px + 48px); }
  .blog-suggestions-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-post-title { font-size: 32px; }
}

@media (max-width: 700px) {
  .blog-cat-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .blog-hero h1 { font-size: 36px; }
  .blog-cat-cards-section { padding: 36px 0; }
  .blog-cat-page-meta { flex-direction: column; gap: 12px; }
  .blog-cat-page-meta h1 { font-size: 30px; }
  .blog-post-nav { grid-template-columns: 1fr; }
  .blog-post-nav-link.nav-next { text-align: left; }
  .blog-suggestions-grid { grid-template-columns: 1fr; }
  .blog-post-title { font-size: 26px; }
}

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