/* =========================================================
   Core JKD Blog Redesign — Elegant Self-Contained Styles
   Pure modern CSS, no external framework deps at runtime.
   Optimized for readability, polish, performance, a11y, SEO.
   ========================================================= */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --color-bg: #f8f7f4;           /* warm off-white */
  --color-surface: #ffffff;
  --color-text: #1f2937;         /* gray-800 */
  --color-text-muted: #4b5563;   /* gray-600 */
  --color-text-light: #6b7280;   /* gray-500 */
  --color-accent: #9f1239;       /* rich red-800 (martial energy) */
  --color-accent-hover: #7f1d1d;
  --color-border: #e5e7eb;
  --color-card-border: #f3f4f6;

  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px -2px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.06);

  --max-content: 72ch;
  --container: 1280px;

  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode preference support (subtle, reading focused) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-surface: #1e2937;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-light: #64748b;
    --color-border: #334155;
    --color-card-border: #475569;
  }
  .blog-card { background: var(--color-surface); }
}

/* --- Base & Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.72;
  color: var(--color-text);
  background: var(--color-bg);
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* --- Layout Primitives --- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
@media (min-width: 768px) {
  .container { padding-left: 2rem; padding-right: 2rem; }
}

.prose {
  max-width: var(--max-content);
  margin-left: auto;
  margin-right: auto;
}
.prose > * + * { margin-top: 1.1em; }
.prose p { margin: 0 0 1.1em; }
.prose h2, .prose h3, .prose h4 { margin-top: 1.8em; margin-bottom: 0.6em; line-height: 1.25; }
.prose ul, .prose ol { padding-left: 1.25em; margin: 1em 0; }
.prose li + li { margin-top: 0.4em; }
.prose blockquote {
  margin: 1.6em 0;
  padding: 0.8em 1.25em;
  border-left: 5px solid var(--color-accent);
  color: var(--color-text-muted);
  font-style: italic;
  background: rgba(0,0,0,0.02);
}
.prose img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin: 1.25em 0;
}
.prose img.float-left { float: left; margin: 0.25em 1.5em 1em 0; max-width: 42%; }
.prose img.float-right { float: right; margin: 0.25em 0 1em 1.5em; max-width: 42%; }
.prose figure { margin: 1.5em 0; }
.prose figcaption {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.5em;
}

/* --- Header / Nav (self-contained blog) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}
.site-nav .brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
  color: var(--color-text);
}
.site-nav .brand .accent { color: var(--color-accent); }
.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition);
}
.site-nav a:hover { color: var(--color-accent); background: rgba(159,18,57,0.06); }
.site-nav a.active { color: var(--color-accent); font-weight: 600; }

/* --- Hero --- */
.hero {
  position: relative;
  background: linear-gradient(135deg, #111827 0%, #1f2937 55%, #0f172a 100%);
  color: #fff;
  padding: 4.5rem 0 3.5rem;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.06) 0%, transparent 55%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 0 1rem;
}
.hero h1 {
  font-size: clamp(2.25rem, 6vw, 3.1rem);
  font-weight: 800;
  line-height: 1.05;
  margin: 0 0 0.6rem;
  letter-spacing: -0.025em;
}
.hero .subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 46ch;
  margin: 0 auto 0.5rem;
}
.hero .meta {
  font-size: 0.9rem;
  opacity: 0.75;
  margin-top: 0.75rem;
}

/* Index specific hero variant */
.hero--index {
  padding: 3.25rem 0 2.75rem;
}

/* --- Index: Cards Grid --- */
#blog-list, .blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.75rem;
  margin: 2rem 0;
}
@media (min-width: 640px) {
  .blog-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
}
@media (min-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }
}

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}
.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(159,18,57,0.15);
}
.blog-card:focus-within {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.blog-card-image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #111827;
}
.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 420ms cubic-bezier(0.4,0,0.2,1);
}
.blog-card:hover .blog-card-image img { transform: scale(1.035); }

.blog-card-content {
  padding: 1.15rem 1.35rem 1.35rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.blog-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.28;
  color: var(--color-text);
  margin: 0 0 0.5rem;
  transition: color var(--transition);
}
.blog-card:hover .blog-card-title { color: var(--color-accent); }

.blog-card-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1;
  margin-bottom: 0.85rem;
}
.blog-card-meta {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-card-border);
  font-size: 0.8rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* --- Article Body --- */
.article-header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}
.article-title {
  font-size: clamp(1.85rem, 5vw, 2.65rem);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 0.35rem;
  letter-spacing: -0.025em;
}
.article-meta {
  font-size: 0.95rem;
  color: var(--color-text-light);
}
.article-meta time { font-variant-numeric: tabular-nums; }

.article-content {
  font-size: 1.02rem;
  line-height: 1.78;
}
.article-content h2, .article-content h3 {
  font-weight: 700;
  color: var(--color-text);
}
.article-content h2 { font-size: 1.45rem; margin-top: 2em; }
.article-content h3 { font-size: 1.2rem; margin-top: 1.7em; }

.article-content .section {
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 1.35rem 1.5rem;
  margin-bottom: 1.85rem;
  box-shadow: var(--shadow-sm);
}
.article-content .section-header {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
  color: var(--color-accent);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* Images in articles */
.article-content img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 1.35em auto;
}
.article-content img.float-left,
.article-content img.float-right {
  max-width: min(45%, 340px);
  margin-top: 0.25rem;
}
@media (max-width: 640px) {
  .article-content img.float-left,
  .article-content img.float-right {
    float: none;
    display: block;
    max-width: 100%;
    margin: 1.25rem auto;
  }
}

/* --- Prev / Next Navigation --- */
.article-nav {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.article-nav a {
  display: flex;
  flex-direction: column;
  padding: 0.95rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.article-nav a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}
.article-nav .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-light);
  margin-bottom: 0.2rem;
}
.article-nav .title {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}
.article-nav a:hover .title { color: var(--color-accent); }
.article-nav .next { text-align: right; }
.article-nav .prev .label::before { content: "← "; }
.article-nav .next .label::after { content: " →"; }

/* --- Footer --- */
.site-footer {
  margin-top: 4rem;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-light);
  text-align: center;
}

/* --- Utilities & Polish --- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
  margin: 2.25rem 0;
}

/* Reading time badge */
.reading-time {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  background: rgba(0,0,0,0.06);
  color: var(--color-text-light);
}

/* Search / filter for index (elegant) */
#search-input {
  width: 100%;
  max-width: 420px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.95rem;
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: box-shadow var(--transition), border-color var(--transition);
}
#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(159,18,57,0.1);
}

/* Statcounter hidden but present for parity if needed */
.statcounter { display: none !important; }

/* Print styles */
@media print {
  .site-header, .article-nav, .site-footer, #search-input { display: none !important; }
  .hero { background: none; color: #000; }
  .prose, .article-content { font-size: 12pt; line-height: 1.5; }
}

/* Responsive tweaks */
@media (max-width: 480px) {
  .blog-grid { grid-template-columns: 1fr; }
  .hero { padding: 2.75rem 0 2rem; }
  .article-nav { grid-template-columns: 1fr; }
  .article-nav .next { text-align: left; }
  body { overflow-x: hidden; }
  .blog-card-title, .article-title { overflow-wrap: break-word; word-break: break-word; }
  .container { padding-left: 1.25rem; padding-right: 1.25rem; }
  .site-nav { gap: 0.5rem; }
  .site-nav .brand { font-size: 0.98rem; }
}