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

:root {
  --bg: #0f0f10;
  --surface: #1a1a1c;
  --border: #2a2a2e;
  --text: #e8e8ea;
  --muted: #888;
  --accent: #4f7ef8;
  --accent-dim: #2a3f7a;
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #f59e0b;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* NAV */
nav {
  position: sticky;
  top: 0;
  background: rgba(15,15,16,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 52px;
  z-index: 100;
}
.nav-brand {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-brand span { color: var(--muted); font-weight: 400; }
.nav-links { display: flex; gap: 20px; margin-left: auto; }
.nav-links a { font-size: 13px; color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* LAYOUT */
.page-wrap { max-width: 860px; margin: 0 auto; padding: 48px 24px 80px; }
.page-wrap.wide { max-width: 1060px; }

/* HOME HERO */
.hero { padding: 56px 0 40px; }
.hero h1 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.hero p { color: var(--muted); font-size: 16px; max-width: 520px; }

/* CATEGORY GRID */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 40px;
}
.cat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  display: block;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}
.cat-card:hover { border-color: var(--accent); background: #1e1e22; text-decoration: none; }
.cat-icon { font-size: 22px; margin-bottom: 10px; }
.cat-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.cat-card p { font-size: 13px; color: var(--muted); }

/* ARTICLE PAGE */
.article-header { padding: 40px 0 28px; border-bottom: 1px solid var(--border); margin-bottom: 36px; }
.article-header .breadcrumb { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.article-header h1 { font-size: 26px; font-weight: 700; }
.article-header .meta { font-size: 12px; color: var(--muted); margin-top: 8px; }

/* CONTENT BLOCKS */
.content h2 { font-size: 18px; font-weight: 600; margin: 36px 0 12px; }
.content h3 { font-size: 15px; font-weight: 600; margin: 24px 0 8px; }
.content p { margin-bottom: 14px; color: #ccc; }
.content ul, .content ol { padding-left: 20px; margin-bottom: 14px; color: #ccc; }
.content li { margin-bottom: 6px; }
.content code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
}
.content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
}
.content pre code { background: none; border: none; padding: 0; font-size: 13px; }

/* CALLOUTS */
.callout {
  border-left: 3px solid;
  padding: 12px 16px;
  border-radius: 0 6px 6px 0;
  margin-bottom: 16px;
  font-size: 14px;
}
.callout.info { border-color: var(--accent); background: rgba(79,126,248,0.08); color: #a8bffc; }
.callout.warn { border-color: var(--yellow); background: rgba(245,158,11,0.08); color: #fcd34d; }
.callout.success { border-color: var(--green); background: rgba(34,197,94,0.08); color: #86efac; }

/* SCREENSHOT */
.screenshot {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 20px 0;
}
.screenshot img { width: 100%; display: block; }
.screenshot figcaption { padding: 8px 12px; font-size: 12px; color: var(--muted); background: var(--surface); }

/* STEPS */
.steps { counter-reset: step; margin-bottom: 24px; }
.step {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}
.step-num {
  counter-increment: step;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-body { flex: 1; }
.step-body strong { display: block; margin-bottom: 4px; font-size: 14px; }
.step-body p { font-size: 14px; color: #ccc; }

/* TAG */
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.tag.new { background: rgba(34,197,94,0.15); color: var(--green); }
.tag.updated { background: rgba(79,126,248,0.15); color: #93aafc; }

/* SIDEBAR LAYOUT */
.with-sidebar { display: grid; grid-template-columns: 1fr 220px; gap: 48px; align-items: start; }
.sidebar-nav { position: sticky; top: 72px; }
.sidebar-nav ul { list-style: none; border-left: 1px solid var(--border); }
.sidebar-nav li a { display: block; padding: 5px 12px; font-size: 13px; color: var(--muted); border-left: 2px solid transparent; margin-left: -1px; }
.sidebar-nav li a:hover, .sidebar-nav li a.active { color: var(--text); border-left-color: var(--accent); text-decoration: none; }

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}