/*
 * ============================================================
 *  blog-core.css  —  Sam-Theme5 | Blog Post Base Styles v2
 * ============================================================
 */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Lora:ital,wght@0,400;0,600;1,400&display=swap');

/* ── 1. CSS Custom Properties ─────────────────────────────── */

:root {
  --brand-green:       #16a34a;
  --brand-green-dark:  #15803d;
  --brand-green-light: #dcfce7;
  --brand-green-glow:  rgba(22,163,74,.15);

  --bg-page:           #f8fafc;
  --bg-surface:        #ffffff;
  --bg-surface-2:      #f1f5f9;
  --bg-surface-3:      #e2e8f0;

  --text-primary:      #0f172a;
  --text-secondary:    #334155;
  --text-muted:        #64748b;
  --text-link:         #1d4ed8;
  --text-link-hover:   #1e40af;

  --border-light:      #e2e8f0;
  --border-medium:     #cbd5e1;

  --shadow-xs:  0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.06);

  --font-body:  'Lora', Georgia, serif;
  --font-ui:    'Plus Jakarta Sans', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;

  --radius-sm:  5px;
  --radius-md:  10px;
  --radius-lg:  16px;

  --article-max-width: 820px;
  --transition-base:   0.22s cubic-bezier(.16,1,.3,1);

  /* Category accent (overridden per category) */
  --accent-primary:    #16a34a;
  --accent-secondary:  #15803d;
  --accent-bg:         #f0fdf4;
  --accent-border:     #bbf7d0;
  --code-bg:           #f0f9ff;
  --code-color:        #0369a1;
  --code-border:       #bae6fd;
  --highlight-border:  #16a34a;
  --highlight-bg:      #f0fdf4;
  --blockquote-border: #cbd5e1;
  --blockquote-bg:     #f8fafc;
}

/* ── 2. Dark Mode Tokens ─────────────────────────────────── */

[data-theme="dark"] {
  --bg-page:        #0b0f1a;
  --bg-surface:     #111827;
  --bg-surface-2:   #1a2234;
  --bg-surface-3:   #243048;

  --text-primary:   #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted:     #64748b;
  --text-link:      #60a5fa;
  --text-link-hover:#93c5fd;

  --border-light:   #1e2d45;
  --border-medium:  #2a3f5f;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.5);
  --shadow-md:  0 4px 6px rgba(0,0,0,.5);
  --shadow-lg:  0 10px 15px rgba(0,0,0,.55);

  --accent-bg:           #0d2218;
  --accent-border:       #16a34a;
  --code-bg:             #0d1b2a;
  --code-color:          #7dd3fc;
  --code-border:         #1e3a5f;
  --highlight-bg:        #0d2218;
  --highlight-border:    #16a34a;
  --blockquote-bg:       #131c2e;
  --blockquote-border:   #2a3f5f;
}

/* ── 3. Global Theme Transitions ─────────────────────────── */

body, .site-header, .site-footer, .main-navigation,
.sliding-sidebar, .post-content, .course-text {
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

/* ── 4. Site-Shell Dark Mode ─────────────────────────────── */

[data-theme="dark"] body { background: var(--bg-page); color: var(--text-primary); }

[data-theme="dark"] .site-header {
  background: linear-gradient(135deg, #0d2218 0%, #0f2e1a 50%, #1a3d26 100%);
  box-shadow: 0 2px 20px rgba(0,0,0,.6);
}

[data-theme="dark"] .main-navigation a,
[data-theme="dark"] .site-title a,
[data-theme="dark"] .menu-toggle { color: #d1fae5; }

[data-theme="dark"] .site-footer { background: #06090f; color: #64748b; }
[data-theme="dark"] .site-footer a { color: #4ade80; }
[data-theme="dark"] .sliding-sidebar { background: var(--bg-surface); }
[data-theme="dark"] body.sidebar-open::before { background: rgba(0,0,0,.7); }
[data-theme="dark"] .site-content { background: var(--bg-page); }

/* ── 5. Dark Mode Toggle ─────────────────────────────────── */

.dark-mode-toggle {
  position: fixed;
  bottom: 28px; right: 28px;
  z-index: 9999;
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 1.5px solid var(--border-medium);
  cursor: pointer;
  display: flex;
  align-items: center; justify-content: center;
  font-size: 20px;
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  outline: none;
}

.dark-mode-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.dark-mode-toggle .icon-sun  { display: none; }
.dark-mode-toggle .icon-moon { display: block; }
[data-theme="dark"] .dark-mode-toggle .icon-sun  { display: block; }
[data-theme="dark"] .dark-mode-toggle .icon-moon { display: none; }

/* ── 6. Blog Post Wrapper ─────────────────────────────────── */

.blog-post-wrapper {
  max-width: var(--article-max-width);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.blog-post-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 2px solid var(--border-light);
}

.blog-post-title {
  font-family: var(--font-ui);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.22;
  margin: 0 0 16px;
  letter-spacing: -0.03em;
}

.blog-post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.blog-post-meta .meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.blog-post-meta .meta-item::before {
  content: '';
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent-primary);
  flex-shrink: 0;
}

.blog-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-bg);
  color: var(--accent-primary);
  border: 1px solid var(--accent-border);
  border-radius: 20px;
  padding: 4px 14px;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

/* ── 7. Post Body Typography ─────────────────────────────── */

.post-content,
.course-text,
.blog-body {
  font-family: var(--font-body);
  font-size: 1.07rem;
  line-height: 1.82;
  color: var(--text-primary);
}

[data-theme="dark"] .post-content,
[data-theme="dark"] .course-text,
[data-theme="dark"] .blog-body { color: var(--text-secondary); }

.post-content h1,
.course-text h1,
.blog-body h1 {
  font-family: var(--font-ui);
  font-size: clamp(1.65rem, 3vw, 2.1rem);
  color: var(--accent-primary);
  font-weight: 800;
  margin: 0 0 20px;
  text-align: center;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.post-content h2,
.course-text h2,
.blog-body h2 {
  font-family: var(--font-ui);
  font-size: clamp(1.3rem, 2.5vw, 1.65rem);
  color: var(--text-primary);
  font-weight: 700;
  margin: 48px 0 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-light);
  letter-spacing: -0.02em;
}

.post-content h3,
.course-text h3,
.blog-body h3 {
  font-family: var(--font-ui);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  font-weight: 700;
  margin: 36px 0 10px;
  letter-spacing: -0.01em;
}

[data-theme="dark"] .post-content h2,
[data-theme="dark"] .course-text h2,
[data-theme="dark"] .blog-body h2 {
  color: var(--text-primary);
  border-bottom-color: var(--border-light);
}

[data-theme="dark"] .post-content h3,
[data-theme="dark"] .course-text h3,
[data-theme="dark"] .blog-body h3 { color: var(--text-secondary); }

/* Links */
.post-content a,
.course-text a,
.blog-body a {
  color: var(--text-link);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: color var(--transition-base);
}

.post-content a:hover,
.course-text a:hover,
.blog-body a:hover { color: var(--text-link-hover); }

/* Paragraphs */
.post-content p,
.course-text p,
.blog-body p { margin: 0 0 1.4em; }

/* ── 8. Code ─────────────────────────────────────────────── */

.post-content code,
.course-text code,
.blog-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--code-bg);
  color: var(--code-color);
  border: 1px solid var(--code-border);
  border-radius: 5px;
  padding: 2px 7px;
  font-weight: 500;
}

.post-content pre,
.course-text pre,
.blog-body pre {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin: 24px 0;
  overflow-x: auto;
  box-shadow: var(--shadow-md);
  position: relative;
}

.post-content pre code,
.course-text pre code,
.blog-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e2e8f0;
  font-size: 0.9rem;
  font-weight: 400;
}

[data-theme="dark"] .post-content pre,
[data-theme="dark"] .course-text pre,
[data-theme="dark"] .blog-body pre {
  background: #060d1a;
  border-color: #1e2d45;
}

/* ── 9. Lists ─────────────────────────────────────────────── */

.post-content ul,
.post-content ol,
.course-text ul,
.course-text ol,
.blog-body ul,
.blog-body ol {
  padding-left: 28px;
  margin: 0 0 1.4em;
}

.post-content ul li,
.post-content ol li,
.course-text ul li,
.course-text ol li,
.blog-body ul li,
.blog-body ol li {
  margin-bottom: 0.45em;
  color: var(--text-secondary);
}

[data-theme="dark"] .post-content ul li,
[data-theme="dark"] .post-content ol li,
[data-theme="dark"] .course-text ul li,
[data-theme="dark"] .course-text ol li,
[data-theme="dark"] .blog-body ul li,
[data-theme="dark"] .blog-body ol li { color: var(--text-muted); }

/* ── 10. Blockquote ─────────────────────────────────────── */

.post-content blockquote,
.course-text blockquote,
.blog-body blockquote {
  background: var(--blockquote-bg);
  border-left: 4px solid var(--blockquote-border);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 22px;
  margin: 28px 0;
  color: var(--text-secondary);
  font-size: 1.02rem;
  font-style: italic;
}

[data-theme="dark"] .post-content blockquote,
[data-theme="dark"] .course-text blockquote,
[data-theme="dark"] .blog-body blockquote {
  background: var(--blockquote-bg);
  border-left-color: var(--blockquote-border);
  color: var(--text-muted);
}

/* ── 11. Highlight Box ────────────────────────────────────── */

.highlight-box {
  background: var(--highlight-bg);
  border-left: 4px solid var(--highlight-border);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-family: var(--font-ui);
  font-size: 0.96rem;
}

.highlight-box strong { color: var(--accent-primary); }

/* ── 12. CTA Box ─────────────────────────────────────────── */

.cta-box {
  background: var(--accent-bg);
  border: 1.5px solid var(--accent-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 32px 0;
  text-align: center;
  color: var(--accent-primary);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 1rem;
}

/* ── 13. Post featured images ────────────────────────────── */

.post-featured-image,
.course-featured-image {
  margin: 0 0 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.post-featured-image img,
.course-featured-image img { width: 100%; height: auto; display: block; }

/* ── 14. Post Footer Tags ────────────────────────────────── */

.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.post-tag {
  display: inline-block;
  background: var(--bg-surface-2);
  color: var(--text-muted);
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 4px 14px;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
}

.post-tag:hover {
  background: var(--accent-bg);
  color: var(--accent-primary);
  border-color: var(--accent-border);
}

/* ── 15. Topic Navigation ────────────────────────────────── */

.topic-navigation {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--border-light);
}

.prev-topic, .next-topic {
  flex: 1;
  background: var(--bg-surface-2);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  transition: all var(--transition-base);
}

.prev-topic:hover, .next-topic:hover {
  background: var(--accent-bg);
  border-color: var(--accent-border);
  box-shadow: var(--shadow-sm);
}

.next-topic { text-align: right; }

.prev-topic a, .next-topic a {
  text-decoration: none;
  color: var(--accent-primary);
  font-family: var(--font-ui);
  font-size: 0.92rem;
  font-weight: 600;
}

[data-theme="dark"] .prev-topic,
[data-theme="dark"] .next-topic { background: var(--bg-surface-2); border-color: var(--border-light); }
[data-theme="dark"] .prev-topic a,
[data-theme="dark"] .next-topic a { color: #4ade80; }

/* ── 16. Comments Area ───────────────────────────────────── */

.comments-area {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 2px solid var(--border-light);
}

.comments-title {
  font-family: var(--font-ui);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

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

.comment-body {
  background: var(--bg-surface-2);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-bottom: 16px;
}

[data-theme="dark"] .comment-body { background: var(--bg-surface-2); border-color: var(--border-light); }

.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  transition: border-color var(--transition-base);
}

.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--brand-green-glow);
}

[data-theme="dark"] .comment-form input,
[data-theme="dark"] .comment-form textarea {
  background: var(--bg-surface-2);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.comment-form .submit {
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 30px;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-base), transform .1s;
}

.comment-form .submit:hover { background: var(--accent-secondary); transform: translateY(-1px); }

/* ── 17. Reading Progress Bar ────────────────────────────── */

.reading-progress {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), #22c55e);
  z-index: 9998;
  transition: width .1s linear;
}

/* ── 18. Table ───────────────────────────────────────────── */

.post-content table,
.course-text table,
.blog-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.post-content th,
.course-text th,
.blog-body th {
  background: var(--accent-primary);
  color: white;
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.post-content td,
.course-text td,
.blog-body td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
}

.post-content tr:nth-child(even),
.course-text tr:nth-child(even),
.blog-body tr:nth-child(even) { background: var(--bg-surface-2); }

.post-content tr:hover,
.course-text tr:hover,
.blog-body tr:hover { background: var(--accent-bg); }

[data-theme="dark"] .post-content td,
[data-theme="dark"] .course-text td,
[data-theme="dark"] .blog-body td { color: var(--text-secondary); border-bottom-color: var(--border-light); }

[data-theme="dark"] .post-content tr:nth-child(even),
[data-theme="dark"] .course-text tr:nth-child(even),
[data-theme="dark"] .blog-body tr:nth-child(even) { background: var(--bg-surface-2); }

/* ── 19. Responsive ──────────────────────────────────────── */

@media (max-width: 768px) {
  .blog-post-wrapper { padding: 24px 16px 56px; }
  .topic-navigation { flex-direction: column; }
  .next-topic { text-align: left; }
  .dark-mode-toggle { bottom: 16px; right: 16px; width: 44px; height: 44px; }
}

@media (max-width: 480px) {
  .post-content, .course-text, .blog-body { font-size: 1rem; }
}

/* ── Dark mode patches for home/course pages ─────────────── */
[data-theme="dark"] .search-container { background: linear-gradient(135deg, #060c16 0%, #0a1929 50%, #0d2a1a 100%); }
[data-theme="dark"] .search-field { background: rgba(255,255,255,.08); color: var(--text-primary); border-color: var(--border-medium); }
[data-theme="dark"] .search-field::placeholder { color: var(--text-muted); }
[data-theme="dark"] .category-box { background: var(--bg-surface); border-color: var(--border-light); }
[data-theme="dark"] .category-box a { color: var(--text-primary); }
[data-theme="dark"] .course-topic { background: var(--bg-surface); border-color: var(--border-light); }
[data-theme="dark"] .course-topic a { color: var(--text-primary); }
[data-theme="dark"] .topic-card { background: var(--bg-surface); border-color: var(--border-light); }
[data-theme="dark"] .topic-card h3 { color: var(--text-primary); }
[data-theme="dark"] .topic-card:hover h3 { color: #4ade80; }
[data-theme="dark"] .read-more-btn { background: var(--bg-surface-2); color: #4ade80; }
[data-theme="dark"] .topic-card:hover .read-more-btn { background: var(--brand-green); color: white; }
[data-theme="dark"] .topic-excerpt { color: var(--text-muted); }
[data-theme="dark"] .course-intro { background: var(--bg-surface); color: var(--text-secondary); border-color: var(--border-light); }
[data-theme="dark"] .home-container h2 { color: var(--text-primary); }
[data-theme="dark"] .course-topics-grid h2 { color: var(--text-primary); }
[data-theme="dark"] .course-topics-grid h2:after { background: var(--brand-green); }
[data-theme="dark"] .main-navigation ul ul { background: #1a2030; border-color: var(--border-light); }
[data-theme="dark"] .main-navigation ul ul a { color: #d1fae5; }
[data-theme="dark"] .main-navigation ul ul a:hover { color: white; }