/* ============================================================
   SecureAI Blog — Design System
   Dark cybersecurity aesthetic
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

/* ── CSS Variables — Dark (default) ── */
:root {
  --bg-primary:    #0a0e17;
  --bg-secondary:  #0f1520;
  --bg-tertiary:   #1a2035;
  --bg-card:       #111827;
  --accent-cyan:   #00d4ff;
  --accent-green:  #00cc6a;
  --accent-purple: #7c3aed;
  --text-primary:  #e2e8f0;
  --text-secondary:#94a3b8;
  --text-muted:    #475569;
  --danger:        #ff4444;
  --warning:       #ffaa00;
  --border:        rgba(255,255,255,0.06);
  --border-hover:  rgba(0,212,255,0.4);
  --shadow-cyan:   0 8px 32px rgba(0,212,255,0.12);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.4);
}

/* ── CSS Variables — Light theme ── */
[data-theme="light"] {
  --bg-primary:    #f0f4f8;
  --bg-secondary:  #ffffff;
  --bg-tertiary:   #e2e8f0;
  --bg-card:       #ffffff;
  --accent-cyan:   #0077cc;
  --accent-green:  #007a45;
  --accent-purple: #6d28d9;
  --text-primary:  #0f172a;
  --text-secondary:#334155;
  --text-muted:    #94a3b8;
  --danger:        #dc2626;
  --warning:       #d97706;
  --border:        rgba(0,0,0,0.09);
  --border-hover:  rgba(0,119,204,0.45);
  --shadow-cyan:   0 8px 32px rgba(0,119,204,0.12);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.10);
}

/* ── Shared non-theme variables ── */
:root {
  --radius:        12px;
  --radius-sm:     6px;
  --radius-pill:   999px;
  --font-mono:     'JetBrains Mono', 'Courier New', monospace;
  --font-code:     'Fira Code', monospace;
  --font-body:     'Inter', system-ui, sans-serif;
  --navbar-h:      64px;
}

/* ── Theme transition ── */
body, .navbar, .post-card, .hero-terminal, .toc, .footer,
.search-input, .filter-btn, .callout, .risk-block, .post-nav-link,
.about-section, .footer-inner, pre, blockquote {
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-cyan); filter: brightness(1.2); }

/* ── Light theme link hover fix ── */
[data-theme="light"] a:hover { filter: brightness(0.8); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ── Reading progress bar ── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(to right, var(--accent-cyan), var(--accent-green));
  z-index: 9999;
  transition: width 0.1s linear;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--navbar-h);
  background: rgba(10,14,23,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  transition: text-shadow 0.2s;
}
.nav-logo:hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 20px rgba(0,212,255,0.6);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--accent-cyan);
  transition: width 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  transition: border-color 0.2s;
}
.hamburger:hover { border-color: var(--accent-cyan); }

/* ── Theme toggle button ── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s, transform 0.3s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: rotate(20deg);
}

@media (max-width: 768px) {
  .hamburger { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--navbar-h);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(10,14,23,0.97);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
    gap: 16px;
  }
  .nav-links.nav-open { display: flex; }
  .nav-links a { font-size: 1rem; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 80px 24px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(0,212,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 30%, rgba(0,255,136,0.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-green);
  border: 1px solid rgba(0,255,136,0.3);
  background: rgba(0,255,136,0.05);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  letter-spacing: 0.08em;
}
.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-primary);
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 480px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 32px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1;
}
.stat span:last-child {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Terminal mockup */
.hero-terminal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.terminal-header {
  background: var(--bg-tertiary);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red   { background: #ff5f57; }
.dot-yellow{ background: #ffbd2e; }
.dot-green { background: #28c840; }
.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 8px;
}
.terminal-body {
  padding: 20px;
  font-family: var(--font-code);
  font-size: 0.82rem;
  line-height: 1.8;
}
.t-line { display: block; }
.t-prompt { color: var(--accent-green); }
.t-cmd    { color: var(--text-primary); }
.t-output { color: var(--text-secondary); }
.t-warn   { color: var(--warning); }
.t-danger { color: var(--danger); }
.t-ok     { color: var(--accent-green); }
.t-info   { color: var(--accent-cyan); }
.cursor {
  display: inline-block;
  width: 8px; height: 14px;
  background: var(--accent-cyan);
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-terminal { display: none; }
}

/* ============================================================
   SEARCH + FILTER SECTION
   ============================================================ */
.search-section {
  padding: 48px 24px 0;
}
.search-section .container {
  max-width: 1200px;
  margin: 0 auto;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}
.section-title {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 24px;
}
.search-row {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.search-wrapper {
  position: relative;
  flex: 1;
  min-width: 240px;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}
.search-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 10px 14px 10px 40px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}
.tag-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.04em;
}
.filter-btn:hover { border-color: var(--accent-cyan); color: var(--text-primary); }
.filter-btn.active {
  background: rgba(0,212,255,0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ============================================================
   POSTS GRID
   ============================================================ */
.posts-section {
  padding: 32px 24px 80px;
}
.posts-section .container {
  max-width: 1200px;
  margin: 0 auto;
}
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.no-results {
  text-align: center;
  padding: 64px 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Post Card */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.22s, border-color 0.22s, box-shadow 0.22s;
  position: relative;
  overflow: hidden;
}
.post-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--accent-cyan), var(--accent-green));
  opacity: 0;
  transition: opacity 0.22s;
}
.post-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-cyan);
}
.post-card:hover::before { opacity: 1; }
.card-link {
  display: block;
  padding: 28px;
  color: inherit;
  height: 100%;
}
.card-link:hover { color: inherit; }
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.card-category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.card-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-primary);
  transition: color 0.2s;
}
.post-card:hover .card-title { color: var(--accent-cyan); }
.card-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-meta {
  display: flex;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 14px;
}
.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(0,255,136,0.06);
  border: 1px solid rgba(0,255,136,0.2);
  color: var(--accent-green);
  letter-spacing: 0.04em;
}
.card-arrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  transition: transform 0.2s;
  display: inline-block;
}
.post-card:hover .card-arrow { transform: translateX(4px); }

/* Severity Badges */
.severity-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.severity-badge.critical {
  background: rgba(255,68,68,0.15);
  border: 1px solid rgba(255,68,68,0.4);
  color: #ff6b6b;
}
.severity-badge.high {
  background: rgba(255,170,0,0.12);
  border: 1px solid rgba(255,170,0,0.35);
  color: var(--warning);
}
.severity-badge.medium {
  background: rgba(124,58,237,0.12);
  border: 1px solid rgba(124,58,237,0.35);
  color: #a78bfa;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-section {
  padding: 80px 24px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent 0%, rgba(0,212,255,0.02) 100%);
}
.about-section .container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.about-section .section-label { text-align: center; }
.about-section .section-title { text-align: center; margin-bottom: 20px; }
.about-text {
  color: var(--text-secondary);
  line-height: 1.9;
  font-size: 1rem;
  margin-bottom: 32px;
}
.about-chips {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 24px 32px;
  background: var(--bg-secondary);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-brand .nav-logo { font-size: 1rem; display: inline-block; margin-bottom: 12px; }
.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 260px;
  line-height: 1.7;
}
.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent-cyan); }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  flex-wrap: wrap;
  gap: 12px;
}
@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

/* ============================================================
   POST PAGE — HEADER
   ============================================================ */
.post-header {
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(0,212,255,0.03) 0%, transparent 100%);
}
.post-header .container,
.post-layout .container {
  max-width: 1100px;
  margin: 0 auto;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--accent-cyan); }
.breadcrumb a:hover { text-decoration: underline; }
.post-meta-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.post-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.post-title {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.post-tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* ============================================================
   POST PAGE — LAYOUT (article + TOC)
   ============================================================ */
.post-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 64px;
  align-items: start;
}
@media (max-width: 960px) {
  .post-layout { grid-template-columns: 1fr; }
  .toc { order: -1; }
}

/* TOC */
.toc {
  position: sticky;
  top: calc(var(--navbar-h) + 24px);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.toc-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.toc ol { counter-reset: toc-counter; padding-left: 0; }
.toc li {
  counter-increment: toc-counter;
  margin-bottom: 8px;
}
.toc a {
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: block;
  padding: 3px 0 3px 4px;
  border-left: 2px solid transparent;
  transition: all 0.2s;
  line-height: 1.4;
}
.toc a:hover,
.toc a.toc-active {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
  padding-left: 10px;
}

/* ============================================================
   ARTICLE CONTENT
   ============================================================ */
.post-content {
  min-width: 0; /* prevent grid blowout */
}
.post-content h2 {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-left: 16px;
  border-left: 3px solid var(--accent-cyan);
  color: var(--text-primary);
  line-height: 1.3;
}
.post-content h3 {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--accent-cyan);
}
.post-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--text-primary);
}
.post-content p {
  margin-bottom: 18px;
  color: var(--text-secondary);
  font-size: 0.97rem;
  line-height: 1.85;
}
.post-content ul,
.post-content ol {
  margin: 0 0 18px 20px;
  color: var(--text-secondary);
  font-size: 0.97rem;
}
.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }
.post-content li { margin-bottom: 6px; line-height: 1.75; }
.post-content strong { color: var(--text-primary); font-weight: 600; }
.post-content em { color: var(--accent-cyan); font-style: normal; font-family: var(--font-mono); font-size: 0.9em; }

/* Inline code */
.post-content code {
  font-family: var(--font-code);
  font-size: 0.85em;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--accent-cyan);
}

/* Code blocks */
.post-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  margin: 24px 0;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.code-header {
  background: var(--bg-tertiary);
  padding: 8px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.code-lang {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.post-content pre code {
  background: none;
  border: none;
  border-radius: 0;
  padding: 20px;
  display: block;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: pre;
}

/* Blockquotes / callout boxes */
.post-content blockquote {
  border-left: 3px solid var(--accent-cyan);
  background: rgba(0,212,255,0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.post-content blockquote strong { color: var(--accent-cyan); }

/* Callout boxes */
.callout {
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 24px 0;
  border-left: 3px solid;
  font-size: 0.92rem;
}
.callout-warning {
  background: rgba(255,170,0,0.06);
  border-left-color: var(--warning);
  color: var(--text-secondary);
}
.callout-danger {
  background: rgba(255,68,68,0.06);
  border-left-color: var(--danger);
  color: var(--text-secondary);
}
.callout-info {
  background: rgba(0,212,255,0.06);
  border-left-color: var(--accent-cyan);
  color: var(--text-secondary);
}
.callout-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
  display: block;
}
.callout-warning .callout-label { color: var(--warning); }
.callout-danger  .callout-label { color: var(--danger); }
.callout-info    .callout-label { color: var(--accent-cyan); }

/* Risk blocks */
.risk-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 28px 0;
  position: relative;
}
.risk-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 100%;
  background: var(--accent-cyan);
  border-radius: var(--radius) 0 0 var(--radius);
}
.risk-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.risk-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.risk-badge-row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

/* ============================================================
   POST NAVIGATION (prev/next)
   ============================================================ */
.post-nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 64px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  flex: 1;
  max-width: 340px;
  transition: border-color 0.2s, box-shadow 0.2s;
  color: inherit;
}
.post-nav-link:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-cyan);
  color: inherit;
}
.post-nav-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.post-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}
.post-nav-link.next { text-align: right; margin-left: auto; }

/* ============================================================
   BACK TO TOP BUTTON
   ============================================================ */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--accent-cyan);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s, border-color 0.2s;
  z-index: 50;
}
#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
#back-to-top:hover { border-color: var(--accent-cyan); box-shadow: 0 0 12px rgba(0,212,255,0.3); }

/* ============================================================
   UTILITIES
   ============================================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
}
.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}