/* ═══════════════════════════════════════
   Blog — Premium Dark Theme Extension
   ═══════════════════════════════════════ */

/* ── Blog Listing Page ── */
.blog-listing-section {
  padding: 0 0 80px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
  margin-top: 8px;
}

.blog-card {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.9) 0%, rgba(20, 17, 39, 0.97) 100%);
  border: 1px solid rgba(122, 110, 214, 0.22);
  border-radius: 20px;
  overflow: hidden;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 20px 42px rgba(0, 0, 0, 0.24);
}

.blog-card:hover {
  transform: translateY(-6px);
  border-color: rgba(170, 150, 255, 0.5);
  box-shadow: 0 28px 56px rgba(0, 0, 0, 0.36), 0 0 28px rgba(122, 110, 214, 0.18);
}

.blog-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.blog-card-body {
  padding: 26px 24px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.blog-card-tag {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-secondary);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.blog-card-body h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.blog-card-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: 18px;
}

.blog-card-link {
  color: #b9abff;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}

.blog-card:hover .blog-card-link { color: #f4eeff; }

/* ── Article Page ── */
.article-hero {
  padding: 80px 0 40px;
  text-align: center;
  position: relative;
  z-index: 100;
}

.article-hero > .container:first-child {
  position: relative;
  z-index: 10;
}

.article-hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 18px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-secondary) 50%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  flex-wrap: wrap;
}

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

.article-meta-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
}

.article-hero-image {
  max-width: 860px;
  margin: 32px auto 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(122, 110, 214, 0.22);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.35);
}

.article-hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Article Body ── */
.article-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 0 80px;
}

.article-body h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin: 48px 0 18px;
  letter-spacing: -0.03em;
  position: relative;
  padding-left: 18px;
}

.article-body h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 12px;
}

.article-body p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.9;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.85;
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

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

.article-body a {
  color: #f5c96d;
  text-decoration: none;
  transition: color 0.15s ease;
}

.article-body a:hover {
  text-decoration: underline;
}

/* ── In-article image ── */
.article-image {
  margin: 36px 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(122, 110, 214, 0.18);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
}

.article-image img {
  width: 100%;
  height: auto;
  display: block;
}

.article-image figcaption {
  padding: 14px 18px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  background: rgba(15, 20, 50, 0.65);
  font-style: italic;
}

/* ── Table of Contents ── */
.toc-box {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.92) 0%, rgba(19, 16, 38, 0.96) 100%);
  border: 1px solid rgba(142, 125, 255, 0.18);
  border-radius: 16px;
  padding: 24px 28px;
  margin-bottom: 40px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

.toc-box h4 {
  font-size: 0.78rem;
  font-weight: 700;
  color: #b9abff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  display: block;
  transition: all 0.15s ease;
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border-left-color: var(--accent-primary);
}

/* ── Interactive Katakana Chart ── */
.kana-chart-container {
  margin: 36px 0;
}

.kana-chart-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.kana-chart-btn {
  padding: 10px 20px;
  border: 1px solid rgba(122, 110, 214, 0.28);
  border-radius: 12px;
  background: rgba(31, 24, 56, 0.8);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-primary);
}

.kana-chart-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
}

.kana-chart-btn.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  border-color: var(--accent-primary);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.kana-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.kana-cell {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.85) 0%, rgba(20, 17, 39, 0.92) 100%);
  border: 1px solid rgba(122, 110, 214, 0.18);
  border-radius: 12px;
  padding: 14px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.kana-cell:hover {
  border-color: rgba(170, 150, 255, 0.5);
  background: rgba(99, 102, 241, 0.12);
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), 0 0 16px rgba(99, 102, 241, 0.15);
  z-index: 2;
}

.kana-cell.active {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.18);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.kana-cell.header-cell {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.25);
  cursor: default;
}

.kana-cell.header-cell:hover {
  transform: none;
  box-shadow: none;
}

.kana-char {
  font-family: var(--font-jp);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
}

.kana-romaji {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.kana-cell.empty {
  background: transparent;
  border-color: transparent;
  cursor: default;
}

.kana-cell.empty:hover {
  transform: none;
  box-shadow: none;
}

/* ── Audio Popup ── */
.kana-audio-popup {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.98) 0%, rgba(20, 17, 39, 0.99) 100%);
  border: 1px solid rgba(142, 125, 255, 0.3);
  border-radius: 16px;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(99, 102, 241, 0.15);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.kana-audio-popup.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}

.kana-audio-popup .popup-char {
  font-family: var(--font-jp);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.kana-audio-popup .popup-info {
  display: flex;
  flex-direction: column;
}

.kana-audio-popup .popup-romaji {
  font-size: 1rem;
  color: var(--accent-secondary);
  font-weight: 600;
}

.kana-audio-popup .popup-type {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ── Comparison Table ── */
.comparison-table-wrap {
  margin: 36px 0;
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid rgba(122, 110, 214, 0.22);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.comparison-table thead th {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.95) 0%, rgba(24, 20, 48, 0.95) 100%);
  color: #b9abff;
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(142, 125, 255, 0.18);
  position: sticky;
  top: 0;
}

.comparison-table tbody tr {
  transition: background 0.15s ease;
}

.comparison-table tbody tr:hover {
  background: rgba(99, 102, 241, 0.06);
}

.comparison-table tbody td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
}

.comparison-table tbody td:first-child {
  color: var(--text-primary);
  font-weight: 600;
}

.comparison-table .jp-char {
  font-family: var(--font-jp);
  font-size: 1.3rem;
  font-weight: 700;
}

.comparison-table .hiragana-col {
  color: #f5a0b0;
}

.comparison-table .katakana-col {
  color: #a0b0f5;
}

/* ── Info Callout Boxes ── */
.info-callout {
  padding: 20px 24px;
  border-radius: 14px;
  margin: 28px 0;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.info-callout.tip {
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.info-callout.warning {
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.info-callout.note {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.callout-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.callout-content {
  flex: 1;
}

.callout-content strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.92rem;
}

.info-callout.tip .callout-content strong { color: var(--accent-success); }
.info-callout.warning .callout-content strong { color: var(--accent-warning); }
.info-callout.note .callout-content strong { color: var(--accent-tertiary); }

.callout-content p {
  margin: 0 !important;
  font-size: 0.92rem !important;
  line-height: 1.7 !important;
}

/* ── Stats / Metrics Row ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin: 36px 0;
}

.stat-box {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.9) 0%, rgba(20, 17, 39, 0.95) 100%);
  border: 1px solid rgba(122, 110, 214, 0.22);
  border-radius: 14px;
  padding: 22px 18px;
  text-align: center;
  transition: all 0.2s ease;
}

.stat-box:hover {
  border-color: rgba(170, 150, 255, 0.4);
  transform: translateY(-2px);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 6px;
}

/* ── Interactive Quiz ── */
.quiz-container {
  background: linear-gradient(180deg, rgba(31, 24, 56, 0.92) 0%, rgba(19, 16, 38, 0.96) 100%);
  border: 1px solid rgba(142, 125, 255, 0.18);
  border-radius: 18px;
  padding: 32px;
  margin: 40px 0;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

.quiz-container h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.quiz-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.quiz-question {
  text-align: center;
  margin-bottom: 24px;
}

.quiz-kana {
  font-family: var(--font-jp);
  font-size: 4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.quiz-prompt {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.quiz-option {
  padding: 14px;
  border: 1px solid rgba(122, 110, 214, 0.22);
  border-radius: 12px;
  background: rgba(15, 20, 50, 0.5);
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-primary);
  text-align: center;
}

.quiz-option:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
}

.quiz-option.correct {
  background: rgba(52, 211, 153, 0.15);
  border-color: var(--accent-success);
  color: var(--accent-success);
}

.quiz-option.wrong {
  background: rgba(248, 113, 113, 0.15);
  border-color: var(--accent-error);
  color: var(--accent-error);
}

.quiz-option.disabled {
  pointer-events: none;
  opacity: 0.5;
}

.quiz-score {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: rgba(15, 20, 50, 0.5);
  border-radius: 12px;
  border: 1px solid rgba(122, 110, 214, 0.15);
}

.quiz-score-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.quiz-score-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-secondary);
}

.quiz-next-btn {
  margin-top: 14px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  font-family: var(--font-primary);
}

.quiz-next-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

/* ── Progress Bar (for learning sections) ── */
.progress-container {
  margin: 28px 0;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.progress-bar {
  height: 8px;
  background: rgba(15, 20, 50, 0.6);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid rgba(122, 110, 214, 0.15);
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Timeline ── */
.timeline {
  position: relative;
  padding-left: 32px;
  margin: 36px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary), transparent);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -25px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid var(--bg-deep);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.timeline-date {
  font-size: 0.78rem;
  color: var(--accent-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.timeline-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ── CTA Box ── */
.article-cta {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(167, 139, 250, 0.08) 100%);
  border: 1px solid rgba(142, 125, 255, 0.22);
  border-radius: 18px;
  padding: 36px 32px;
  text-align: center;
  margin: 48px 0 0;
}

.article-cta h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.article-cta p {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 20px;
  font-size: 0.95rem;
}

.article-cta .btn-primary {
  display: inline-flex;
  text-decoration: none;
  padding: 14px 32px;
}

/* ── Related Articles ── */
.related-articles {
  padding: 60px 0 80px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 0;
}

.related-articles .section-title {
  margin-bottom: 32px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .blog-grid { grid-template-columns: 1fr; }
  .kana-grid { grid-template-columns: repeat(5, 1fr); gap: 4px; }
  .kana-cell { padding: 10px 4px; }
  .kana-char { font-size: 1.1rem; }
  .kana-romaji { font-size: 0.62rem; }
  .quiz-options { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .article-body h2 { font-size: 1.3rem; }
  .article-body { padding: 32px 0 60px; }
  .quiz-container { padding: 22px; }
  .comparison-table { font-size: 0.82rem; }
  .article-hero { padding: 50px 0 24px; }
}

@media (max-width: 480px) {
  .kana-grid { grid-template-columns: repeat(5, 1fr); gap: 3px; }
  .kana-char { font-size: 0.95rem; }
  .kana-cell { padding: 8px 3px; border-radius: 8px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .blog-card-image { height: 180px; }
}