/* ==========================================================================
   BLOG DESIGN SYSTEM — FLAT MONOCHROME (BLACK, WHITE & GRAYSCALE)
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-code: 'Fira Code', monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.4s;
}

[data-theme="dark"] {
  --bg: #09090b;
  --bg-subtle: #121215;
  --surface: #18181b;
  --surface-hover: #27272a;
  --border: rgba(255, 255, 255, 0.12);
  --border-bright: rgba(255, 255, 255, 0.3);
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  --accent-bg: #ffffff;
  --accent-text: #09090b;
  --card-bg: #121215;
  --chip-bg: #1e1e22;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  --header-bg: rgba(9, 9, 11, 0.85);
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-subtle: #f4f4f5;
  --surface: #fafafa;
  --surface-hover: #f0f0f3;
  --border: rgba(0, 0, 0, 0.12);
  --border-bright: rgba(0, 0, 0, 0.35);
  --text: #09090b;
  --text-muted: #52525b;
  --text-dim: #888891;
  --accent-bg: #09090b;
  --accent-text: #ffffff;
  --card-bg: #ffffff;
  --chip-bg: #f0f0f4;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  --header-bg: rgba(255, 255, 255, 0.85);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg) !important;
  color: var(--text) !important;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

/* Subtle background grid pattern */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: 
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.15;
}

.icon {
  display: inline-block;
  vertical-align: -0.15em;
  flex-shrink: 0;
}

/* Header & Nav */
header.blog-header {
  position: sticky;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  background: var(--header-bg);
}

.blog-nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo,
.nav-crest {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.crest-dot {
  font-size: 0.6rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.rune-btn {
  font-family: var(--font-sans);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.rune-btn:hover {
  background: var(--surface-hover);
  border-color: var(--border-bright);
}

/* Main Container Layout */
.blog-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  flex: 1;
  width: 100%;
  position: relative;
  z-index: 1;
}

/* Hero Section */
.blog-hero {
  border-bottom: 1px solid var(--border);
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
}

.blog-hero-subtitle {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.blog-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  margin: 0 0 0.75rem 0;
  color: var(--text) !important;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.blog-hero-desc {
  font-family: var(--font-sans);
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
  line-height: 1.6;
  max-width: 680px;
}

/* Category Filter Bar */
.category-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 2.5rem;
  scrollbar-width: none;
}

.category-filter-bar::-webkit-scrollbar {
  display: none;
}

.cat-tab {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.45rem 1rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.cat-tab:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--border-bright);
}

.cat-tab.active {
  background: var(--accent-bg);
  color: var(--accent-text);
  border-color: var(--accent-bg);
  font-weight: 600;
}

/* Post Cards Feed */
.post-feed {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-bright);
}

.author-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.avatar-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.post-date-read {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.dot-sep {
  font-size: 0.5rem;
  color: var(--text-dim);
}

.post-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin: 0 0 0.6rem 0;
  color: var(--text) !important;
  line-height: 1.3;
  font-weight: 600;
  transition: color 0.2s ease;
}

.post-card:hover .post-title {
  color: var(--text) !important;
}

.post-excerpt {
  font-family: var(--font-sans);
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.post-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cat-badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.cat-badge {
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
}

.read-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  font-weight: 600;
  font-size: 0.85rem;
  transition: gap 0.2s ease;
}

.post-card:hover .read-btn {
  gap: 0.7rem;
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}

footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-crest {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.hidden {
  display: none !important;
}