/* =========================================================
   Ventic HVAC — v2 Learning Center (blog index + articles)
   Loaded after styles-v2.css on blog.html, article.html, blog/<slug>/.
   Relies on the tokens defined in styles-v2.css.
   ========================================================= */

/* ---------- Blog hero ---------- */
.v2-learn .blog-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: min(62vh, 620px);
  padding: clamp(96px, 12vw, 160px) var(--v-gutter) clamp(48px, 6vw, 80px);
  color: var(--v-on-dark);
  background: var(--v-deep);
  overflow: hidden;
  isolation: isolate;
}

.v2-learn .blog-hero-backdrop {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.v2-learn .blog-hero-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 65% 50%;
  animation: v-kenburns 22s ease-out both;
}

.v2-learn .blog-hero-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(6, 18, 31, 0.9) 0%, rgba(6, 18, 31, 0.62) 40%, rgba(6, 18, 31, 0.1) 75%),
    linear-gradient(0deg, rgba(6, 18, 31, 0.7) 0%, rgba(6, 18, 31, 0) 45%);
}

.v2-learn .blog-hero .eyebrow {
  color: var(--v-on-dark-muted);
}

.v2-learn .blog-hero h1 {
  max-width: 760px;
  margin-bottom: 18px;
  color: #fff;
  font-size: clamp(44px, 6vw, 88px);
  line-height: 1;
}

.v2-learn .blog-hero p {
  max-width: 560px;
  margin: 0;
  color: var(--v-on-dark-muted);
  font-size: clamp(17px, 1.4vw, 20px);
}

/* ---------- Library ---------- */
.v2-learn .blog-library {
  display: block;
  padding: clamp(40px, 5vw, 64px) var(--v-gutter) var(--v-section);
  background: none;
}

.v2-learn .blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(28px, 3vw, 40px);
}

.v2-learn .blog-filters button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  color: var(--v-ink);
  font: 600 14px/1 var(--v-font-body);
  background: var(--v-card);
  border: 1px solid var(--v-line);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

.v2-learn .blog-filters button small {
  color: var(--v-muted);
  font-weight: 700;
  font-size: 12px;
}

.v2-learn .blog-filters button:hover {
  border-color: var(--v-ink);
}

.v2-learn .blog-filters button[aria-pressed="true"] {
  color: #fff;
  background: var(--v-navy);
  border-color: var(--v-navy);
}

.v2-learn .blog-filters button[aria-pressed="true"] small {
  color: var(--v-orange);
}

.v2-learn .blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.v2-learn .blog-library article.blog-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  background: var(--v-card);
  border: 1px solid var(--v-line);
  border-radius: var(--v-radius-md);
  box-shadow: var(--v-shadow-soft);
  transform: none;
  transition: transform 350ms var(--v-ease), box-shadow 350ms var(--v-ease);
}

.v2-learn .blog-library article.blog-card::after {
  display: none;
}

.v2-learn .blog-library article.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--v-shadow-lift);
}

.v2-learn .blog-card[hidden] {
  display: none !important;
}

.v2-learn .blog-card-media {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.v2-learn .blog-card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 700ms var(--v-ease);
}

.v2-learn .blog-card:hover .blog-card-media img {
  transform: scale(1.05);
}

.v2-learn .blog-card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 12px;
  padding: 24px 26px 26px;
}

.v2-learn .blog-library .blog-card-body span {
  padding: 0;
  color: var(--v-orange-2);
  background: none;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.v2-learn .blog-library .blog-card-body h2 {
  margin: 0;
  font-family: var(--v-font-display);
  font-weight: 500;
  font-size: 24px;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.v2-learn .blog-card-body h2 a:hover {
  color: var(--v-blue);
}

.v2-learn .blog-library .blog-card-body p {
  margin: 0;
  color: var(--v-muted);
  font-size: 15.5px;
}

.v2-learn .blog-card-body .text-link {
  margin-top: auto;
  padding-top: 6px;
  color: var(--v-ink);
  font-weight: 700;
}

.v2-learn .blog-card-body .text-link::after {
  content: " →";
  color: var(--v-orange);
}

/* Featured: first card spans the full row as a horizontal feature */
.v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
}

.v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured .blog-card-media {
  aspect-ratio: auto;
  min-height: 380px;
}

.v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured .blog-card-body {
  justify-content: center;
  padding: clamp(28px, 4vw, 56px);
}

.v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured h2 {
  font-size: clamp(30px, 3vw, 44px);
}

.v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured p {
  font-size: 17px;
}

/* ---------- Article ---------- */
.v2-learn .article-shell {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: clamp(32px, 5vw, 72px);
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--v-gutter) var(--v-section);
}

.v2-learn .article-aside {
  order: 2;
  top: 140px;
}

.v2-learn .article-aside > .text-link {
  color: var(--v-ink);
  font-weight: 700;
}

.v2-learn .article-aside > .text-link::before {
  content: "← ";
  color: var(--v-orange);
}

.v2-learn .article-cta-panel {
  gap: 16px;
  padding: 28px;
  background:
    radial-gradient(400px 200px at 100% 0%, rgba(31, 111, 209, 0.35), transparent 70%),
    var(--v-navy);
  border-radius: var(--v-radius-md);
  box-shadow: var(--v-shadow-lift);
}

.v2-learn .article-cta-panel strong {
  font-family: var(--v-font-display);
  font-weight: 500;
  font-size: 24px;
  line-height: 1.15;
}

.v2-learn .article-cta-panel p {
  color: var(--v-on-dark-muted);
}

.v2-learn .article-reader {
  order: 1;
  max-width: 760px;
  padding: 0;
  background: none;
  border: 0;
  box-shadow: none;
}

.v2-learn .article-reader .result-label {
  color: var(--v-orange-2);
  background: none;
  padding: 0;
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.v2-learn .article-reader h1 {
  margin: 14px 0 16px;
  font-size: clamp(38px, 4.6vw, 62px);
  line-height: 1.04;
  text-wrap: balance;
}

.v2-learn .article-reader .article-meta {
  margin: 0 0 28px;
  color: var(--v-muted);
  font-size: 14px;
  font-weight: 600;
}

.v2-learn .article-banner {
  margin: 0 0 40px;
  overflow: hidden;
  border-radius: var(--v-radius-lg);
  box-shadow: var(--v-shadow-lift);
}

.v2-learn .article-banner img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.v2-learn .article-reader h2 {
  margin: 52px 0 14px;
  font-size: clamp(28px, 2.8vw, 38px);
  line-height: 1.12;
}

.v2-learn .article-reader h3 {
  margin: 32px 0 10px;
  font-size: 21px;
}

.v2-learn .article-reader p,
.v2-learn .article-reader li {
  color: var(--v-ink);
  font-size: 18.5px;
  line-height: 1.75;
}

.v2-learn .article-reader > p:first-of-type {
  font-size: 21px;
  line-height: 1.6;
}

.v2-learn .article-reader ul {
  gap: 10px;
  padding-left: 0;
  list-style: none;
}

.v2-learn .article-reader ul li {
  position: relative;
  padding-left: 28px;
}

.v2-learn .article-reader ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--v-orange);
  transform: rotate(45deg);
}

.v2-learn .article-reader a:not(.button) {
  color: var(--v-blue);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.v2-learn .article-reader strong {
  color: var(--v-ink);
}

/* FAQ accordions inside articles */
.v2-learn .faq-item {
  background: var(--v-card);
  border: 1px solid var(--v-line);
  border-radius: var(--v-radius-md);
}

.v2-learn .faq-item[open] {
  border-color: rgba(242, 113, 43, 0.45);
  box-shadow: var(--v-shadow-soft);
}

.v2-learn .faq-item summary {
  color: var(--v-ink);
  font-weight: 700;
}

/* ---------- Legal pages (privacy, terms) ---------- */
.v2-learn .legal-page {
  padding: clamp(40px, 6vw, 80px) var(--v-gutter) var(--v-section);
  background: none;
}

.v2-learn .legal-card {
  max-width: 820px;
  margin: 0 auto;
  padding: clamp(28px, 5vw, 64px);
  color: var(--v-ink);
  background: var(--v-card);
  border: 1px solid var(--v-line);
  border-radius: var(--v-radius-lg);
  box-shadow: var(--v-shadow-soft);
}

.v2-learn .legal-card h1 {
  color: var(--v-ink);
  font-size: clamp(36px, 4.4vw, 56px);
  line-height: 1.05;
}

.v2-learn .legal-card h2 {
  margin-top: 40px;
  color: var(--v-ink);
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.2;
}

.v2-learn .legal-card p,
.v2-learn .legal-card li {
  color: var(--v-ink);
  font-size: 17px;
  line-height: 1.7;
}

.v2-learn .legal-card a {
  color: var(--v-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.v2-learn .legal-kicker {
  color: var(--v-orange-2);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.v2-learn .legal-card .legal-updated {
  color: var(--v-muted);
  font-size: 14px;
}

/* ---------- Dark mode: neutralize legacy dark surfaces from styles.css ---------- */
:root[data-theme="dark"] .v2-learn .article-reader {
  background: none;
  border: 0;
  box-shadow: none;
}

:root[data-theme="dark"] .v2-learn .article-reader a:not(.button),
:root[data-theme="dark"] .v2-learn .legal-card a {
  color: var(--v-sky);
}

:root[data-theme="dark"] .v2-learn .faq-item summary::after {
  color: var(--v-sky);
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .v2-learn .blog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .v2-learn .article-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .v2-learn .article-aside {
    position: static;
    order: 2;
  }

  .v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured {
    grid-template-columns: minmax(0, 1fr);
  }

  .v2-learn .blog-library:not(.is-filtered) .blog-card.is-featured .blog-card-media {
    min-height: 0;
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 640px) {
  .v2-learn .blog-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .v2-learn .blog-filters {
    flex-wrap: nowrap;
    margin-right: calc(var(--v-gutter) * -1);
    padding-right: var(--v-gutter);
    overflow-x: auto;
    scrollbar-width: none;
  }

  .v2-learn .blog-filters button {
    flex: none;
  }

  .v2-learn .article-reader p,
  .v2-learn .article-reader li {
    font-size: 17.5px;
  }

  .v2-learn .article-reader > p:first-of-type {
    font-size: 19px;
  }

  .v2-learn .blog-hero {
    min-height: 70vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .v2-learn .blog-hero-backdrop img {
    animation: none;
  }

  .v2-learn .blog-card,
  .v2-learn .blog-card-media img {
    transition: none;
  }
}