/* ══════════════════════════════════════════
   INTERIOR PAGES (Blog, Tutorials)
══════════════════════════════════════════ */

/* ── Page Hero ───────────────────── */
.page-hero {
  padding: calc(var(--nav-h) + var(--sp-20)) 0 var(--sp-20);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(34, 197, 94, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-4);
  background: var(--clr-primary-subtle);
  border: 1px solid var(--clr-primary-border);
  border-radius: var(--r-full);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: var(--sp-6);
}

.page-hero h1 {
  font-size: var(--text-5xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--clr-text);
  max-width: 680px;
  margin: 0 auto var(--sp-5);
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--clr-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.65;
}

@media (max-width: 768px) {
  .page-hero h1 {
    font-size: var(--text-4xl);
  }
  .page-hero p {
    font-size: var(--text-base);
  }
}

/* ── Filter Bar ──────────────────── */
.page-filters {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-12);
}

.filter-btn {
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--r-full);
  border: 1px solid var(--clr-border);
  background: transparent;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--clr-text-secondary);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
  font-family: var(--font);
}

.filter-btn:hover {
  border-color: rgba(255,255,255,0.15);
  color: var(--clr-text);
  background: rgba(255,255,255,0.04);
}

.filter-btn.active {
  background: var(--clr-primary-subtle);
  border-color: var(--clr-primary-border);
  color: var(--clr-primary);
}

/* ── Article Grid ────────────────── */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-bottom: var(--sp-16);
}

/* ── Featured Article (first card, spans 2 cols) */
.article-card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-8);
  align-items: center;
  padding: var(--sp-8) var(--sp-10);
}

.article-card--featured .article-card__visual {
  height: 280px;
  border-radius: var(--r-xl);
  border-bottom: none;
  display: block;
}

.article-card--featured .article-card__visual::after {
  display: none;
}

.article-card--featured .article-card__visual img {
  position: static;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── Article Card ────────────────── */
.article-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-2xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--t-base) var(--ease),
              transform var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
  cursor: pointer;
  text-decoration: none;
}

.article-card:hover {
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

/* ── Visual Placeholder ──────────── */
.article-card__visual {
  height: 200px;
  background: linear-gradient(135deg, rgba(34,197,94,0.08) 0%, rgba(8,17,37,0.8) 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--clr-border);
}

.article-card__visual-icon {
  width: 64px;
  height: 64px;
  background: var(--clr-primary-subtle);
  border: 1px solid var(--clr-primary-border);
  border-radius: var(--r-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-primary);
  position: relative;
  z-index: 1;
}

.article-card__visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.article-card__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, var(--clr-bg-card) 100%);
}

/* ── Body ────────────────────────── */
.article-card__body {
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  flex: 1;
}

/* ── Featured body override */
.article-card--featured .article-card__body {
  padding: 0;
  gap: var(--sp-5);
}

/* ── Meta ────────────────────────── */
.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.article-card__category {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-primary);
  background: var(--clr-primary-subtle);
  border: 1px solid var(--clr-primary-border);
  padding: 2px var(--sp-2);
  border-radius: var(--r-full);
}

.article-card__date,
.article-card__read-time {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
}

/* ── Title ───────────────────────── */
.article-card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--clr-text);
  line-height: 1.3;
}

.article-card--featured .article-card__title {
  font-size: var(--text-3xl);
  letter-spacing: -0.03em;
}

/* ── Excerpt ─────────────────────── */
.article-card__excerpt {
  font-size: var(--text-sm);
  color: var(--clr-text-secondary);
  line-height: 1.65;
  flex: 1;
}

/* ── Footer ──────────────────────── */
.article-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--sp-2);
}

.article-card__author {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  color: var(--clr-text-secondary);
}

.article-card__avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--clr-primary-subtle);
  border: 1px solid var(--clr-primary-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--clr-primary);
}

.article-card__link {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--clr-primary);
  transition: gap var(--t-fast);
}

.article-card:hover .article-card__link {
  gap: var(--sp-2);
}

/* ── Tutorial Card Extras ─────────── */
.tutorial-card__difficulty {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
}

.difficulty-dots {
  display: flex;
  gap: 3px;
}

.difficulty-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-border);
}

.difficulty-dots span.filled {
  background: var(--clr-primary);
}

/* ── CTA Banner ──────────────────── */
.page-cta {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.08) 0%, var(--clr-bg-card) 100%);
  border: 1px solid var(--clr-primary-border);
  border-radius: var(--r-2xl);
  padding: var(--sp-12) var(--sp-16);
  text-align: center;
  margin-bottom: var(--sp-32);
  position: relative;
  overflow: hidden;
}

.page-cta::before {
  content: '';
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 200px;
  background: radial-gradient(ellipse, rgba(34, 197, 94, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.page-cta h2 {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--clr-text);
  margin-bottom: var(--sp-3);
}

.page-cta p {
  font-size: var(--text-base);
  color: var(--clr-text-secondary);
  margin-bottom: var(--sp-8);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.page-cta__actions {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ══════════════════════════════════════════
   VIDEO TUTORIALS
══════════════════════════════════════════ */

/* ── Category Section ────────────── */
.tutorial-category {
  margin-bottom: var(--sp-16);
}

.tutorial-category__header {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid var(--clr-border);
}

.tutorial-category__icon {
  width: 40px;
  height: 40px;
  background: var(--clr-primary-subtle);
  border: 1px solid var(--clr-primary-border);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-primary);
  flex-shrink: 0;
}

.tutorial-category__title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--clr-text);
}

.tutorial-category__count {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--clr-text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--clr-border);
  padding: 2px var(--sp-2);
  border-radius: var(--r-full);
  margin-left: auto;
}

/* ── Video Grid ──────────────────── */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-5);
}

/* ── Video Card ──────────────────── */
.video-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--t-base) var(--ease),
              transform var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
}

.video-card:not(.video-card--placeholder):hover {
  border-color: rgba(255,255,255,0.14);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

/* ── Thumbnail ───────────────────── */
.video-card__thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #050e1f;
  overflow: hidden;
  cursor: pointer;
}

.video-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--t-slow) var(--ease), opacity var(--t-base) var(--ease);
}

.video-card:not(.video-card--placeholder):hover .video-card__thumb img {
  transform: scale(1.04);
  opacity: 0.85;
}

/* ── Play button ─────────────────── */
.video-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.25);
  transition: background var(--t-fast) var(--ease);
}

.video-card:hover .video-card__play {
  background: rgba(0,0,0,0.1);
}

.video-card__play-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.92);
  border: 2px solid rgba(255,255,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--t-base) var(--ease),
              background var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
  box-shadow: 0 4px 24px rgba(34, 197, 94, 0.5);
}

.video-card:hover .video-card__play-btn {
  transform: scale(1.1);
  background: var(--clr-primary);
  box-shadow: 0 6px 32px rgba(34, 197, 94, 0.7);
}

.video-card__play-btn svg {
  margin-left: 3px; /* optical center for triangle */
}

/* ── Embedded iframe (shown after click) */
.video-card__thumb iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ── Placeholder state ───────────── */
.video-card--placeholder {
  opacity: 0.7;
  cursor: default;
}

.video-card--placeholder .video-card__thumb {
  cursor: default;
  background: linear-gradient(135deg, #0a1628 0%, #0d1a35 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-card__placeholder-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  color: var(--clr-text-muted);
}

.video-card__placeholder-inner svg {
  opacity: 0.4;
}

.video-card__coming-soon {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-full);
}

/* ── Card Body ───────────────────── */
.video-card__body {
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  flex: 1;
}

.video-card__title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--clr-text);
  line-height: 1.35;
}

.video-card--placeholder .video-card__title {
  color: var(--clr-text-secondary);
}

.video-card__duration {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
}

/* ── Responsive ─────────────────── */
@media (max-width: 1024px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
  .tutorial-category__header {
    flex-wrap: wrap;
  }
  .tutorial-category__count {
    margin-left: 0;
  }
}

/* ════════════════════════════════════
   ARTICLE DETAIL PAGE
════════════════════════════════════ */

.article-page {
  padding-top: calc(var(--nav-h) + var(--sp-12));
  padding-bottom: var(--sp-24);
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-sm);
  color: var(--clr-text-secondary);
  text-decoration: none;
  margin-bottom: var(--sp-6);
  transition: color var(--t-fast);
}

.article-back:hover {
  color: var(--clr-primary);
}

.article-page__header {
  max-width: 780px;
  margin: 0 auto;
  padding-bottom: var(--sp-8);
}

.article-page__header h1 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: var(--sp-5) 0 var(--sp-6);
  color: var(--clr-text);
}

.article-page__author {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.article-page__author-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--clr-text);
}

.article-page__author-title {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
  margin-top: 2px;
}

.article-page__hero {
  max-width: 780px;
  margin: 0 auto var(--sp-12);
  max-height: 480px;
  overflow: hidden;
  border-radius: var(--r-2xl);
}

.article-page__hero img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  display: block;
}

.article-page__body {
  max-width: 780px;
  margin: 0 auto;
}

.article-page__lead {
  font-size: var(--text-lg);
  color: var(--clr-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--sp-8);
}

.article-page__body h2 {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-text);
  margin: var(--sp-10) 0 var(--sp-4);
}

.article-page__body h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--clr-text);
  margin: var(--sp-7) 0 var(--sp-3);
}

.article-page__body p {
  font-size: var(--text-base);
  color: var(--clr-text-secondary);
  line-height: 1.85;
  margin-bottom: var(--sp-5);
}

.article-page__body ul,
.article-page__body ol {
  padding-left: var(--sp-6);
  margin-bottom: var(--sp-5);
}

.article-page__body li {
  font-size: var(--text-base);
  color: var(--clr-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--sp-2);
}

.article-page__body strong {
  color: var(--clr-text);
  font-weight: 600;
}

.article-callout {
  background: rgba(34, 197, 94, 0.05);
  border: 1px solid var(--clr-primary-border);
  border-left: 3px solid var(--clr-primary);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  padding: var(--sp-5) var(--sp-6);
  margin: var(--sp-8) 0;
}

.article-callout p {
  margin: 0;
  color: var(--clr-text);
  font-style: italic;
  line-height: 1.7;
}

.article-page__divider {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin: var(--sp-10) 0;
}

.article-page__cta {
  background: linear-gradient(135deg, rgba(34,197,94,0.06) 0%, rgba(13,26,53,0.4) 100%);
  border: 1px solid var(--clr-primary-border);
  border-radius: var(--r-2xl);
  padding: var(--sp-8) var(--sp-10);
  text-align: center;
  margin-top: var(--sp-14);
  position: relative;
  overflow: hidden;
}

.article-page__cta::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--clr-primary), transparent);
}

.article-page__cta h3 {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--clr-text);
  margin-bottom: var(--sp-2);
}

.article-page__cta p {
  color: var(--clr-text-secondary);
  margin-bottom: var(--sp-5);
  line-height: 1.7;
}

/* ── Responsive ─────────────────── */
@media (max-width: 1024px) {
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-card--featured {
    grid-column: 1 / -1;
    grid-template-columns: 1fr;
  }
  .article-card--featured .article-card__visual {
    height: 200px;
  }
}

@media (max-width: 640px) {
  .article-grid {
    grid-template-columns: 1fr;
  }
  .page-cta {
    padding: var(--sp-8) var(--sp-6);
  }
  .page-cta h2 {
    font-size: var(--text-2xl);
  }
}