:root {
  --bg:#ffffff;
  --fg:#0b0b0b;
  --accent:#ff3b30;
  --muted:#e9e9e9;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

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

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.25;
  padding: 48px 32px;
}

/* typography */
h1,h2,h3 {
  font-family: var(--mono);
  margin: 0 0 12px 0;
  letter-spacing: 0.02em;
  color: var(--fg);
}
h1 { font-size: 2rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1rem; font-weight: 700; }

h1::after {
  content: "";
  display: inline-block;
  height: 6px;
  width: 72px;
  margin-left: 12px;
  vertical-align: middle;
  background: var(--accent);
}

p {
  margin: 0 0 12px 0;
  color: var(--fg);
  opacity: 0.95;
  font-size: 0.98rem;
}

/* links */
a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 3px solid var(--fg);
  padding-bottom: 2px;
  font-weight: 700;
}
a:hover { background: var(--muted); color: var(--fg); }

/* buttons */
button, .btn {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 700;
  padding: 10px 16px;
  border: 3px solid var(--fg);
  background: transparent;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
button.primary, .btn.primary {
  background: var(--fg);
  color: var(--bg);
}
button.ghost, .btn.ghost {
  background: transparent;
  color: var(--fg);
}

/* forms */
input, textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 3px solid var(--fg);
  background: transparent;
  font-family: var(--sans);
  font-size: 0.98rem;
  outline: 0;
  margin-bottom: 12px;
}

/* layout helpers */
.row { display: flex; gap: 16px; align-items: center; }
.col { flex: 1; }

/* images */
img {
  display: block;
  max-width: 100%;
  border: 6px solid var(--fg);
  padding: 4px;
  background: var(--muted);
  margin: 12px 0;
  object-fit: cover;
}

/* code */
pre, code {
  font-family: var(--mono);
  background: var(--muted);
  color: var(--fg);
  padding: 12px;
  border: 3px solid var(--fg);
  overflow: auto;
  margin: 12px 0;
}

/* lists */
ul, ol { margin: 12px 0 12px 1.25rem; }
li { margin: 6px 0; font-weight: 600; }

/* footer */
footer {
  margin-top: 28px;
  padding-top: 12px;
  border-top: 3px solid var(--fg);
  font-size: 0.85rem;
  color: var(--fg);
  opacity: 0.9;
}

/* responsive */
@media (max-width: 720px) {
  body { padding: 24px 18px; }
  h1 { font-size: 1.5rem; }
}

/* dark mode toggle */
.brutal-dark {
  --bg:#0b0b0b;
  --fg:#f6f6f6;
  --muted:#111;
}