@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,600;1,300&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
  --bg: #0B0E14;
  --surface: #111520;
  --surface2: #161B28;
  --border: #1E2535;
  --accent: #3B82F6;
  --text: #E2E8F0;
  --text-muted: #64748B;
  --text-dim: #94A3B8;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans', sans-serif;
  --head: 'Space Grotesk', sans-serif;
  --color-serdes: #3B82F6;
  --color-pdn:    #F97316;
  --color-pll:    #22D3A5;
  --color-layout: #A855F7;
  --color-career: #FBBF24;
  --color-basics: #F43F5E;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

a { text-decoration: none; color: inherit; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Prose styles cho bài viết ── */
.prose { max-width: 680px; margin: 0 auto; color: var(--text-dim); }
.prose h1, .prose h2, .prose h3 { font-family: var(--head); color: var(--text); margin: 2rem 0 1rem; letter-spacing: -0.02em; }
.prose h1 { font-size: 2rem; }
.prose h2 { font-size: 1.4rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.prose h3 { font-size: 1.1rem; }
.prose p { margin-bottom: 1.2rem; }
.prose ul, .prose ol { padding-left: 1.5rem; margin-bottom: 1.2rem; }
.prose li { margin-bottom: 0.4rem; }
.prose a { color: var(--accent); }
.prose a:hover { text-decoration: underline; }
.prose strong { color: var(--text); font-weight: 600; }
.prose blockquote { border-left: 3px solid var(--accent); padding-left: 1rem; color: var(--text-muted); font-style: italic; margin: 1.5rem 0; }
.prose code { font-family: var(--mono); font-size: 13px; background: var(--surface2); border: 1px solid var(--border); padding: 2px 6px; border-radius: 3px; color: var(--accent); }
.prose pre { background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 20px; overflow-x: auto; margin: 1.5rem 0; }
.prose pre code { background: none; border: none; padding: 0; color: var(--text); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-family: var(--mono); font-size: 13px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--surface); color: var(--text); font-weight: 600; }