/* ==========================================================================
   I-Cost Blogs & Insights - Editorial Stylesheet
   Designed to complement homepage.css with a clean, high-readability
   editorial layout inspired by leading industry publications.
   ========================================================================== */

/* Page Hero */
.blog-hero {
  padding: 60px 0 44px;
  background: radial-gradient(800px 400px at 80% 0%, rgba(79, 212, 223, 0.08), transparent 70%), var(--icost-bg);
  border-bottom: 1px solid var(--icost-border);
}

.blog-hero-inner {
  margin: 0;
  padding: 0;
  text-align: left;
}

.blog-hero .breadcrumbs {
  margin-bottom: 18px;
  font-size: 0.82rem;
  color: var(--icost-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.blog-hero .breadcrumbs a {
  color: var(--icost-text);
  transition: color 0.15s ease;
}

.blog-hero .breadcrumbs a:hover {
  color: var(--icost-cyan);
}

.blog-hero .breadcrumbs span[aria-hidden="true"] {
  color: rgba(255, 255, 255, 0.25);
}

.blog-hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1.1;
  margin-bottom: 16px;
  color: var(--icost-white);
  max-width: 860px;
}

.blog-hero h1 span {
  color: var(--icost-cyan);
  display: block;
}

.blog-hero .hero-lead {
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--icost-text);
  max-width: 780px;
  margin: 0;
}

/* Search & Filter Toolbar */
.blog-toolbar {
  position: sticky;
  top: 82px;
  z-index: 15;
  background: var(--icost-bg-deep);
  border-bottom: 1px solid var(--icost-border);
  padding: 16px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.toolbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.search-box {
  position: relative;
  min-width: 280px;
  flex: 1;
  max-width: 440px;
}

.search-box svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  stroke: var(--icost-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 44px;
  padding: 10px 40px 10px 42px;
  background: var(--icost-panel);
  border: 1px solid var(--icost-border);
  border-radius: 6px;
  color: var(--icost-white);
  font-size: 0.9rem;
  transition: border-color 0.2s, background 0.2s;
}

.search-input::placeholder {
  color: var(--icost-muted);
}

.search-input:focus {
  outline: none;
  border-color: var(--icost-cyan);
  background: var(--icost-panel-soft);
}

.search-clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--icost-muted);
  cursor: pointer;
  padding: 4px;
  display: none;
  line-height: 1;
  font-size: 1.1rem;
}

.search-clear:hover {
  color: var(--icost-white);
}

.search-clear.visible {
  display: block;
}

.results-count {
  font-size: 0.82rem;
  color: var(--icost-muted);
  white-space: nowrap;
}

.results-count strong {
  color: var(--icost-cyan);
}

/* Category Filter Chips */
.category-filter-nav {
  padding: 14px 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.category-filter-nav::-webkit-scrollbar {
  height: 4px;
}

.category-filter-nav::-webkit-scrollbar-thumb {
  background: var(--icost-panel-soft);
  border-radius: 4px;
}

.cat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--icost-border);
  background: var(--icost-panel);
  color: var(--icost-text);
  font-size: 0.82rem;
  font-weight: 550;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.18s ease;
}

.cat-chip:hover {
  background: var(--icost-panel-soft);
  border-color: rgba(79, 212, 223, 0.4);
  color: var(--icost-white);
}

.cat-chip.active,
.cat-chip[aria-pressed="true"] {
  background: var(--icost-cyan);
  border-color: var(--icost-cyan);
  color: var(--icost-bg-deep);
  font-weight: 700;
}

/* Featured Article Section */
.featured-section {
  padding: 48px 0 24px;
}

.featured-card {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
  background: var(--icost-panel);
  border: 1px solid var(--icost-border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.featured-card:hover {
  border-color: rgba(79, 212, 223, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.featured-img-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #0d3042;
}

.featured-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.featured-card:hover .featured-img-wrap img {
  transform: scale(1.03);
}

.featured-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 6px 12px;
  background: var(--icost-pink);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 4px;
}

.featured-content {
  padding: 32px 36px 32px 0;
  display: flex;
  flex-direction: column;
}

.article-category-tag {
  align-self: flex-start;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--icost-cyan);
  margin-bottom: 12px;
}

.featured-title {
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
  line-height: 1.2;
  margin-bottom: 14px;
}

.featured-title a {
  color: var(--icost-white);
  transition: color 0.15s ease;
}

.featured-title a:hover {
  color: var(--icost-cyan);
}

.featured-summary {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--icost-text);
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  font-size: 0.8rem;
  color: var(--icost-muted);
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--icost-border);
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.featured-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--icost-cyan);
  font-weight: 700;
  font-size: 0.92rem;
  margin-top: 18px;
  transition: gap 0.2s ease;
}

.featured-link:hover {
  gap: 12px;
  color: var(--icost-cyan-bright);
}

/* Articles Grid */
.articles-section {
  padding: 36px 0 80px;
}

.section-subhead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--icost-border);
}

.section-subhead h2 {
  font-size: clamp(1.5rem, 2vw, 1.9rem);
  color: var(--icost-white);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--icost-panel);
  border: 1px solid var(--icost-border);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 212, 223, 0.45);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3);
}

.card-img-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #0d3042;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.article-card:hover .card-img-wrap img {
  transform: scale(1.04);
}

.card-category-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  padding: 4px 10px;
  background: rgba(4, 21, 33, 0.88);
  border: 1px solid var(--icost-border);
  backdrop-filter: blur(4px);
  color: var(--icost-cyan);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 4px;
}

.card-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title {
  font-size: 1.15rem;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--icost-white);
}

.card-title a {
  color: var(--icost-white);
  transition: color 0.15s ease;
}

.card-title a:hover {
  color: var(--icost-cyan);
}

.card-summary {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--icost-text);
  margin-bottom: 18px;
  flex: 1;
}

.card-footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--icost-muted);
}

.card-readmore {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--icost-cyan);
  font-weight: 700;
  font-size: 0.85rem;
  transition: gap 0.15s ease;
}

.article-card:hover .card-readmore {
  gap: 8px;
  color: var(--icost-cyan-bright);
}

/* Empty State */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 20px;
  background: var(--icost-panel);
  border: 1px dashed var(--icost-border);
  border-radius: 10px;
  display: none;
}

.no-results.visible {
  display: block;
}

.no-results h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.no-results p {
  color: var(--icost-muted);
  margin-bottom: 20px;
}

/* Existing Guides Section on Insights Page */
.existing-guides-section {
  padding: 60px 0;
  background: #fff;
  color: #0b1f2e;
}

.existing-guides-section h2 {
  color: #0b1f2e;
}

.existing-guides-section p {
  color: #4a5d69;
}

/* ==========================================================================
   Single Article Detail Page Layout
   ========================================================================== */
.article-header {
  padding: 56px 0 40px;
  background: var(--icost-bg);
  border-bottom: 1px solid var(--icost-border);
}

.article-header-inner {
  max-width: 860px;
}

.article-header h1 {
  font-size: clamp(2.2rem, 3.8vw, 3.2rem);
  line-height: 1.15;
  margin: 16px 0 20px;
  color: var(--icost-white);
}

.article-header .lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--icost-text);
  margin-bottom: 24px;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  font-size: 0.84rem;
  color: var(--icost-muted);
  padding-top: 18px;
  border-top: 1px solid var(--icost-border);
}

.article-byline strong {
  color: var(--icost-white);
}

.article-featured-media {
  margin: 36px 0 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--icost-border);
  background: #0d3042;
}

.article-featured-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.article-content-layout {
  padding: 56px 0 80px;
  background: #fff;
  color: #1a2a36;
}

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: start;
}

.article-main {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #2b3b47;
}

.article-main h2 {
  color: #0b1f2e;
  font-size: clamp(1.6rem, 2.2vw, 2.1rem);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e3e9ee;
}

.article-main h3 {
  color: #0b1f2e;
  font-size: 1.25rem;
  margin: 28px 0 12px;
}

.article-main p {
  color: #2b3b47;
  margin: 0 0 18px;
}

.article-main ul,
.article-main ol {
  margin: 0 0 22px;
  padding-left: 24px;
}

.article-main li {
  margin-bottom: 8px;
  color: #2b3b47;
}

.article-main table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: 0.94rem;
}

.article-main th {
  background: #061b2a;
  color: #fff;
  text-align: left;
  padding: 12px 14px;
  font-weight: 650;
  font-size: 0.88rem;
}

.article-main td {
  padding: 12px 14px;
  border-bottom: 1px solid #e3e9ee;
  color: #2b3b47;
}

.article-main tr:nth-child(even) td {
  background: #f8fafc;
}

.article-callout {
  padding: 20px 24px;
  margin: 26px 0;
  border-left: 4px solid var(--icost-cyan);
  background: #f0f9fa;
  border-radius: 0 8px 8px 0;
}

.article-callout strong {
  color: #074b53;
  display: block;
  margin-bottom: 6px;
  font-size: 0.98rem;
}

.article-callout p {
  margin: 0;
  font-size: 0.96rem;
  color: #1a424a;
}

.article-key-takeaways {
  background: #f4f7f9;
  border: 1px solid #dbe3e8;
  border-radius: 8px;
  padding: 24px 28px;
  margin: 36px 0;
}

.article-key-takeaways h3 {
  margin-top: 0;
  color: #0b1f2e;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-key-takeaways ul {
  margin-bottom: 0;
}

.article-product-cta {
  background: linear-gradient(135deg, #061b2a, #0a2f46);
  color: #fff;
  padding: 32px;
  border-radius: 10px;
  margin: 44px 0;
  border: 1px solid rgba(79, 212, 223, 0.25);
}

.article-product-cta h3 {
  color: #fff;
  font-size: 1.4rem;
  margin-top: 0;
  margin-bottom: 12px;
}

.article-product-cta p {
  color: var(--icost-text);
  margin-bottom: 20px;
  max-width: 650px;
}

/* Article Sidebar */
.article-sidebar {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-box {
  background: #f8fafc;
  border: 1px solid #e3e9ee;
  border-radius: 8px;
  padding: 22px;
}

.sidebar-box h4 {
  margin: 0 0 14px;
  font-size: 0.95rem;
  color: #0b1f2e;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sidebar-toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.sidebar-toc a {
  font-size: 0.88rem;
  color: #3f5564;
  line-height: 1.35;
  transition: color 0.15s ease;
}

.sidebar-toc a:hover {
  color: #0b6aa8;
  text-decoration: underline;
}

.sidebar-cta {
  background: #061b2a;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar-cta h4 {
  color: #fff;
}

.sidebar-cta p {
  color: var(--icost-text);
  font-size: 0.86rem;
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Related Articles Band */
.related-articles-section {
  padding: 60px 0 80px;
  background: var(--icost-bg);
  border-top: 1px solid var(--icost-border);
}

.related-articles-section h2 {
  font-size: clamp(1.6rem, 2.2vw, 2.2rem);
  margin-bottom: 28px;
}

/* Responsive Media Queries */
@media (max-width: 1080px) {
  .articles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .featured-card {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .featured-content {
    padding: 24px;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 680px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .toolbar-inner {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    max-width: 100%;
  }
  .featured-title {
    font-size: 1.45rem;
  }
  .article-featured-media img {
    aspect-ratio: 16 / 9;
  }
  .article-header {
    padding: 36px 0 28px;
  }
}