:root {
  --bg: #000000;
  --fg: #33ff66;          /* Terminal phosphor green */
  --fg-dim: #22cc55;
  --accent: #00ff88;
  --warn: #ffcc00;
  --error: #ff5555;
  --link: #55ff99;
  --scanline: rgba(255,255,255,0.04);
  --glow: 0 0 6px rgba(51,255,102,0.7), 0 0 12px rgba(51,255,102,0.4);
  --mono: Consolas, "Lucida Console", "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  line-height: 1.4;
}

body {
  margin: 0;
  text-shadow: var(--glow);
}

a { color: var(--link); text-decoration: none; }
.a:hover, a:hover { text-decoration: underline; }

.topbar, .statusbar {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: center;
  border-bottom: 1px solid var(--fg-dim);
  background: #001a0b;
  padding: 0.5rem 0.75rem;
}

.statusbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  border-top: 1px solid var(--fg-dim);
  border-bottom: none;
  background: #001a0b;
  z-index: 10;
}

.brand { font-weight: bold; letter-spacing: 1px; }
.sysinfo { color: var(--fg-dim); opacity: 0.9; font-size: 0.95rem; }

.toggles button {
  background: transparent;
  border: 1px solid var(--fg-dim);
  color: var(--fg);
  padding: 0.3rem 0.6rem;
  margin-left: 0.5rem;
  cursor: pointer;
}
.toggles button:hover { border-color: var(--fg); }

.shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1rem;
  padding: 1rem;
  padding-bottom: 2.75rem; /* for statusbar */
}

.sidebar {
  position: sticky;
  top: 0.75rem;
  align-self: start;
}

.menu-title, .menu-footer, .help {
  color: var(--fg);
}
.nav-link {
  display: block;
  padding: 0.35rem 0.5rem;
  border-left: 2px solid transparent;
}
.nav-link.active {
  border-left-color: var(--accent);
  background: #001407;
}
.nav-link:focus { outline: 1px dashed var(--fg); outline-offset: 2px; }

.content {
  border: 1px solid var(--fg-dim);
  padding: 1rem;
  min-height: 65vh;
  background: #000;
  position: relative;
}

/* Scanlines & CRT vignette */
html.crt body::before {
  content: "";
  position: fixed; inset: 0;
  background: repeating-linear-gradient(
    0deg,
    var(--scanline) 0px,
    var(--scanline) 1px,
    transparent 2px,
    transparent 3px
  );
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.7;
}

html.crt body::after {
  content: "";
  position: fixed; inset: 0;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0) 0%, rgba(0,10,0,0.3) 60%, rgba(0,0,0,0.8) 100%);
  pointer-events: none;
}

/* Typewriter (optional) */
.typewriter { white-space: pre-wrap; }
.caret {
  display: inline-block;
  width: 10px; height: 1em;
  background: var(--fg);
  margin-left: 2px;
  animation: blink 1s step-start infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Markdown defaults */
.content h1, .content h2, .content h3, .content h4 { margin: 0.6rem 0 0.4rem; }
.content h1 { border-bottom: 1px dashed var(--fg-dim); padding-bottom: 0.25rem; }
.content code { background: #001a0b; padding: 0.1rem 0.3rem; border: 1px solid var(--fg-dim); }
.content pre code { display: block; padding: 0.75rem; overflow: auto; }
.content table { border-collapse: collapse; width: 100%; }
.content th, .content td { border: 1px solid var(--fg-dim); padding: 0.4rem 0.5rem; text-align: left; }
.content blockquote { border-left: 3px solid var(--fg-dim); padding-left: 0.75rem; color: var(--fg); opacity: 0.9; }

.loading { color: var(--fg-dim); }

/* Boot screen */
#boot { position: fixed; inset: 0; background: #000; display: grid; place-items: center; z-index: 9999; }
#boot .boot-inner { width: min(700px, 92vw); border: 1px solid var(--fg-dim); padding: 1rem; background: #000; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .caret { animation: none; }
  html.crt body::before { display: none; }
}

/* Scrollbar (WebKit) */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: #014d28; border: 1px solid var(--fg-dim); }