:root {
  --bg:#FAFAF8; --ink:#141412; --ink-strong:#111110; --ink-body:#22221F;
  --ink-mid:#3F3F3A; --muted:#6B6B64; --faint:#4A4A44;
  --line:#E4E4DD; --rule:#C9C9C1;
  --accent:#3A3A38; --accent-hover:#141412; --btn-text:#FAFAF8;
  --ink-invert:0;
}

/* JS-disabled fallback: honour OS preference until the pre-paint script pins data-theme */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:#12120F; --ink:#EFEFE9; --ink-strong:#F7F7F1; --ink-body:#D6D6CE;
    --ink-mid:#BCBCB3; --muted:#8B8B82; --faint:#A6A69D;
    --line:#2B2B25; --rule:#3A3A33;
    --accent:#E2E2DA; --accent-hover:#FFFFFF; --btn-text:#12120F;
    --ink-invert:1;
  }
}

:root[data-theme="dark"] {
  --bg:#12120F; --ink:#EFEFE9; --ink-strong:#F7F7F1; --ink-body:#D6D6CE;
  --ink-mid:#BCBCB3; --muted:#8B8B82; --faint:#A6A69D;
  --line:#2B2B25; --rule:#3A3A33;
  --accent:#E2E2DA; --accent-hover:#FFFFFF; --btn-text:#12120F;
  --ink-invert:1;
}

html, body { margin: 0; padding: 0; background: var(--bg); }
html { transition: background-color .25s ease; }
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink-strong); }

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--btn-text);
  text-decoration: none;
  padding: 15px 30px;
  font-size: 16px;
  letter-spacing: 0.01em;
  border-radius: 10px;
}
.btn:hover { background: var(--accent-hover); color: var(--btn-text); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-left: 10px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--rule); }

/* Sun = "you're in dark, click for light"; moon = the reverse. */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }