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

/* ── Variables ── */
:root {
  --bg-main:        #070A0D;
  --bg-surface:     #10151B;
  --bg-elevated:    #141B23;
  --border:         #1F2933;

  --text-primary:   #E6E9ED;
  --text-muted:     #9AA3AD;

  --accent-primary: #7D4627;
  --accent-soft:    #5C3420;

  --font-body:      system-ui, 'Inter', sans-serif;
  --font-mono:      'JetBrains Mono', 'Fira Code', 'IBM Plex Mono', monospace;
}

/* ── Base ── */
html { font-size: 16px; }

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--text-primary);
  text-decoration: none;
}

a:hover {
  color: var(--accent-primary);
}

/* ── Layout ── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 2rem 0 1.5rem;
  margin-bottom: 3rem;
}

.site-header .container {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.site-title:hover {
  color: var(--accent-primary);
}

.site-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.75rem;
}

.site-nav a {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.site-nav a:hover {
  color: var(--accent-primary);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-top: 4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ── Section Label ── */
.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* ── Post Card ── */
.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s;
}

.post-card:hover {
  border-color: var(--accent-primary);
}

.post-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.post-title {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

/* ── Tags ── */
.tag {
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
}

/* ── Writeup ── */
.writeup-header {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.writeup-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.meta-value {
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* ── Difficulty Colors ── */
.difficulty-easy   { color: #4CAF50; }
.difficulty-medium { color: #FF9800; }
.difficulty-hard   { color: #F44336; }
.difficulty-insane { color: var(--accent-primary); }

/* ── Writeup Content ── */
.writeup-content {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 2rem;
}

.writeup-content h2 {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin: 2rem 0 1rem;
}

.writeup-content h3 {
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin: 1.5rem 0 0.75rem;
}

.writeup-content p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.writeup-content a {
  color: var(--accent-primary);
  border-bottom: 1px solid var(--accent-soft);
}

.writeup-content ul,
.writeup-content ol {
  margin: 0 0 1rem 1.5rem;
}

.writeup-content li {
  margin-bottom: 0.4rem;
}

/* ── Code ── */
.writeup-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
}

.writeup-content code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-elevated);
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--border);
}

.writeup-content pre code {
  background: none;
  border: none;
  padding: 0;
}

/* ── Images ── */
.writeup-content img {
  max-width: 100%;
  border: 1px solid var(--border);
  margin: 1rem 0;
}

/* ── Writeup Meta Tags Row ── */
.writeup-meta-tags {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}