/* ===== NISSA INTERNATIONAL — blog.css ===== */
/* Built on top of shared design tokens in css/style.css.
   Do NOT redefine palette, font, or spacing tokens here. */

/* ---------- BLOG HERO / PAGE HEADER ---------- */
.blog-hero {
  background: var(--col-ink);
  padding: calc(var(--header-h) + var(--sp-6)) 0 var(--sp-6);
  position: relative;
  overflow: hidden;
}

.blog-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,.18) 0%, rgba(8,145,178,.12) 100%);
  pointer-events: none;
}

.blog-hero .container { position: relative; z-index: 2; }

.blog-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #93C5FD;
  margin-bottom: var(--sp-2);
}

.blog-hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: #93C5FD;
  border-radius: 2px;
  flex-shrink: 0;
}

.blog-hero h1 {
  font-size: clamp(28px, 5vw, 56px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.08;
  max-width: 700px;
  margin-bottom: var(--sp-3);
}

.blog-hero-desc {
  font-size: 18px;
  color: #94A3B8;
  max-width: 600px;
  line-height: 1.72;
  margin: 0;
}

/* ---------- BREADCRUMB ---------- */
.breadcrumb {
  padding: var(--sp-3) 0 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13.5px;
  color: var(--col-muted);
}

.breadcrumb li + li::before {
  content: '/';
  color: var(--col-line);
  font-size: 12px;
}

.breadcrumb a {
  color: var(--col-primary);
  transition: color var(--dur);
  font-weight: 500;
}

.breadcrumb a:hover { color: var(--col-primary-dk); }

.breadcrumb [aria-current="page"] {
  color: var(--col-body);
}

/* ---------- BLOG LISTING PAGE ---------- */
.blog-listing { background: var(--col-surface); }

.blog-intro {
  background: var(--col-white);
  padding: var(--sp-6) 0 var(--sp-5);
  border-bottom: 1px solid var(--col-line);
}

.blog-intro-inner {
  max-width: 720px;
}

.blog-intro h2 {
  font-size: clamp(22px, 3.5vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}

.blog-intro p {
  font-size: 17px;
  color: var(--col-body);
  line-height: 1.75;
  margin: 0;
}

/* post card grid */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  padding: var(--sp-6) 0;
}

.post-card {
  background: var(--col-white);
  border: 1px solid var(--col-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  transition: transform var(--dur) var(--ease-spring),
              box-shadow var(--dur) var(--ease-out),
              border-color var(--dur);
}

.post-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: #BFDBFE;
}

.post-card-thumb {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--col-ink) 0%, #1e3a5f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

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

.post-card-thumb-placeholder {
  font-size: 44px;
  color: #93C5FD;
  opacity: 0.7;
}

.post-card-body {
  padding: var(--sp-3) var(--sp-3) var(--sp-4);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--sp-2);
}

.post-category {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--col-teal);
  background: var(--col-teal-lt);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.post-date {
  font-size: 12.5px;
  color: var(--col-muted);
}

.post-read-time {
  font-size: 12.5px;
  color: var(--col-muted);
}

.post-card h2,
.post-card h3 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin: 0 0 var(--sp-2);
  color: var(--col-ink);
}

.post-card h2 a,
.post-card h3 a {
  color: inherit;
  transition: color var(--dur);
}

.post-card h2 a:hover,
.post-card h3 a:hover { color: var(--col-primary); }

.post-excerpt {
  color: var(--col-muted);
  font-size: 15px;
  line-height: 1.65;
  margin: 0 0 auto;
}

.post-card-footer {
  margin-top: var(--sp-3);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--col-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.post-card-footer .btn {
  font-size: 13px;
  padding: 9px 20px;
}

/* ---------- ARTICLE LAYOUT ---------- */
.article-wrapper {
  padding: var(--sp-5) 0 var(--sp-7);
  background: var(--col-white);
}

.article-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--sp-6);
  align-items: start;
}

/* allow grid children to shrink below their content's intrinsic width
   (prevents wide tables from forcing horizontal page overflow on mobile) */
.article-grid > * { min-width: 0; }

/* link-based language switcher (blog uses <a> instead of <button>) */
.lang-switch a {
  display: inline-block;
  text-decoration: none;
  color: #94A3B8;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: 0.5px;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  transition: color var(--dur), background var(--dur);
}
.lang-switch a:hover { color: #fff; }
.lang-switch a.active { background: var(--col-primary); color: #fff; }

/* featured (cover) image at the top of an article */
.article-hero {
  margin: 0 0 var(--sp-4);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.article-hero img { width: 100%; height: auto; display: block; }

/* real image inside blog index post cards */
.post-card-media {
  aspect-ratio: 16/9;
  overflow: hidden;
  flex-shrink: 0;
}
.post-card-media img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* prose area */
.article-prose {
  max-width: 72ch;
}

.article-byline {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--col-line);
}

.byline-publisher {
  display: flex;
  align-items: center;
  gap: 10px;
}

.byline-publisher img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.byline-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.byline-name {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  color: var(--col-ink);
}

.byline-date {
  font-size: 12.5px;
  color: var(--col-muted);
}

.byline-sep {
  width: 1px;
  height: 32px;
  background: var(--col-line);
  margin: 0 var(--sp-1);
}

.byline-readtime {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--col-muted);
}

.byline-readtime i { color: var(--col-teal); }

/* article heading hierarchy */
.article-prose h1 {
  font-size: clamp(26px, 4.5vw, 44px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--col-ink);
  margin-bottom: var(--sp-3);
}

.article-prose h2 {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--col-ink);
  margin: var(--sp-6) 0 var(--sp-2);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--col-line);
}

.article-prose h2:first-of-type {
  margin-top: var(--sp-4);
  padding-top: 0;
  border-top: none;
}

.article-prose h3 {
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--col-ink);
  margin: var(--sp-4) 0 var(--sp-2);
}

.article-prose h4 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--col-teal);
  margin: var(--sp-3) 0 var(--sp-1);
}

/* body copy */
.article-prose p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--col-body);
  margin: 0 0 var(--sp-3);
}

.article-prose a:not(.btn) {
  color: var(--col-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur);
}

.article-prose a:not(.btn):hover { color: var(--col-primary-dk); }

.article-prose strong { color: var(--col-ink); font-weight: 600; }

.article-prose em { font-style: italic; }

/* lists */
.article-prose ul,
.article-prose ol {
  margin: 0 0 var(--sp-3) var(--sp-3);
  padding: 0;
  list-style: revert;
}

.article-prose ul { list-style: disc; }
.article-prose ol { list-style: decimal; }

.article-prose li {
  color: var(--col-body);
  font-size: 17px;
  line-height: 1.75;
  margin-bottom: 6px;
}

/* definition / call-out box */
.definition-box {
  background: var(--col-teal-lt);
  border-left: 4px solid var(--col-teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--sp-3) var(--sp-4);
  margin: var(--sp-4) 0;
}

.definition-box .definition-label {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--col-teal);
  margin-bottom: 8px;
}

.definition-box p {
  font-size: 16.5px;
  color: var(--col-ink);
  margin: 0;
  font-weight: 500;
  line-height: 1.65;
}

/* comparison table */
.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--sp-4) 0;
  font-size: 15.5px;
  background: var(--col-white);
  border-radius: var(--radius-md);
  /* display:block + overflow-x lets wide comparison tables scroll horizontally
     on narrow screens instead of pushing the whole page sideways */
  display: block;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--col-line);
}

.article-prose th {
  background: var(--col-ink);
  color: #fff;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 13px 18px;
  text-align: left;
}

.article-prose td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--col-line);
  color: var(--col-body);
  vertical-align: top;
  line-height: 1.55;
}

.article-prose tr:last-child td { border-bottom: none; }
.article-prose tr:nth-child(even) td { background: var(--col-surface); }

/* FAQ section */
.faq-section {
  margin: var(--sp-6) 0 var(--sp-5);
  padding-top: var(--sp-5);
  border-top: 2px solid var(--col-line);
}

.faq-section .faq-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--col-teal);
  margin-bottom: var(--sp-2);
}

.faq-section .faq-eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--col-teal);
  border-radius: 2px;
}

.faq-section h2 {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--col-ink);
  margin: 0 0 var(--sp-4);
  border-top: none;
  padding-top: 0;
}

.faq-item {
  border: 1px solid var(--col-line);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-2);
  overflow: hidden;
  transition: box-shadow var(--dur);
}

.faq-item:hover { box-shadow: var(--shadow-sm); }

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--col-ink);
  letter-spacing: -0.01em;
  transition: background var(--dur), color var(--dur);
}

.faq-question:hover { background: var(--col-surface); }

.faq-question[aria-expanded="true"] {
  background: var(--col-surface);
  color: var(--col-primary);
}

.faq-question i {
  flex-shrink: 0;
  color: var(--col-teal);
  font-size: 14px;
  transition: transform var(--dur) var(--ease-out);
}

.faq-question[aria-expanded="true"] i {
  transform: rotate(45deg);
  color: var(--col-primary);
}

.faq-question:focus-visible {
  outline: 2px solid var(--col-primary);
  outline-offset: -2px;
}

.faq-answer {
  display: none;
  padding: 0 var(--sp-4) var(--sp-3);
  background: var(--col-surface);
  border-top: 1px solid var(--col-line);
}

.faq-answer.open { display: block; }

.faq-answer p {
  font-size: 16px;
  line-height: 1.72;
  color: var(--col-body);
  margin: var(--sp-2) 0 0;
}

/* article CTA box */
.article-cta-box {
  background: linear-gradient(135deg, var(--col-ink) 0%, #1e3a8a 100%);
  border-radius: var(--radius-lg);
  padding: var(--sp-5) var(--sp-5);
  margin: var(--sp-6) 0 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.article-cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,.25) 0%, rgba(8,145,178,.20) 100%);
}

.article-cta-box .container,
.article-cta-box > * { position: relative; z-index: 2; }

.article-cta-box .cta-eyebrow {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #93C5FD;
  display: block;
  margin-bottom: var(--sp-1);
}

.article-cta-box h3 {
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}

.article-cta-box p {
  color: #94A3B8;
  font-size: 16px;
  max-width: 480px;
  margin: 0 auto var(--sp-4);
  line-height: 1.65;
}

/* sidebar */
.article-sidebar {
  position: sticky;
  top: calc(var(--header-h) + var(--sp-3));
}

.sidebar-widget {
  background: var(--col-surface);
  border: 1px solid var(--col-line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  margin-bottom: var(--sp-3);
}

.sidebar-widget-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--col-ink);
  margin-bottom: var(--sp-2);
  padding-bottom: var(--sp-1);
  border-bottom: 2px solid var(--col-teal);
  display: block;
}

.sidebar-toc ol {
  list-style: decimal;
  padding-left: 20px;
  margin: 0;
}

.sidebar-toc li {
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 8px;
  color: var(--col-body);
}

.sidebar-toc a {
  color: var(--col-body);
  transition: color var(--dur);
  text-decoration: none;
}

.sidebar-toc a:hover { color: var(--col-primary); }

.sidebar-contact-widget {
  background: linear-gradient(135deg, var(--col-primary) 0%, var(--col-teal) 100%);
  border: none;
  text-align: center;
}

.sidebar-contact-widget .sidebar-widget-title {
  color: rgba(255,255,255,.9);
  border-bottom-color: rgba(255,255,255,.3);
}

.sidebar-contact-widget p {
  color: rgba(255,255,255,.85);
  font-size: 14px;
  line-height: 1.6;
  margin: 0 0 var(--sp-2);
}

.sidebar-contact-widget .btn {
  background: #fff;
  color: var(--col-primary);
  width: 100%;
}

.sidebar-contact-widget .btn:hover {
  background: var(--col-ink);
  color: #fff;
}

/* related posts in article */
.related-posts {
  padding: var(--sp-6) 0;
  background: var(--col-surface);
  border-top: 1px solid var(--col-line);
}

.related-posts .section-head {
  text-align: left;
  max-width: none;
  margin-bottom: var(--sp-4);
}

.related-posts .section-head h2 {
  font-size: 24px;
  text-transform: none;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}

.related-card {
  background: var(--col-white);
  border: 1px solid var(--col-line);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
  display: flex;
  gap: var(--sp-2);
  align-items: flex-start;
  transition: box-shadow var(--dur), border-color var(--dur), transform var(--dur) var(--ease-spring);
}

.related-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: #BFDBFE;
  transform: translateY(-3px);
}

.related-card-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--col-teal-lt);
  color: var(--col-teal);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.related-card-body h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--col-ink);
  letter-spacing: -0.01em;
  text-transform: none;
  margin-bottom: 4px;
}

.related-card-body h4 a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur);
}

.related-card-body h4 a:hover { color: var(--col-primary); }

.related-card-body p {
  font-size: 13.5px;
  color: var(--col-muted);
  line-height: 1.55;
  margin: 0;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 980px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .article-sidebar { position: static; }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .blog-hero { padding: calc(var(--header-h) + var(--sp-4)) 0 var(--sp-5); }
  .article-byline { flex-wrap: wrap; }
  .byline-sep { display: none; }
  .post-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
}

@media (max-width: 520px) {
  .faq-question { font-size: 15px; padding: var(--sp-2) var(--sp-3); }
  .faq-answer   { padding: 0 var(--sp-3) var(--sp-2); }
  .article-cta-box { padding: var(--sp-4) var(--sp-3); }
}