/* ── Base reset ── */
*, *::before, *::after { box-sizing: border-box; }

/* ── Theme variables ── */
:root {
  --bg:      #fafafa;
  --bg-alt:  #f0f0f0;
  --panel:   #ffffff;
  --border:  #d4d4d4;
  --text:    #1a1a1a;
  --muted:   #636363;
  --accent:  #2a2a2a;
  --link:    #1a5276;
  --font:    'Charter', 'Bitstream Charter', 'Georgia', 'Times New Roman', serif;
  --sans:    -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono:    'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #141414;
    --bg-alt:  #1c1c1c;
    --panel:   #1a1a1a;
    --border:  #2e2e2e;
    --text:    #c8c8c8;
    --muted:   #7a7a7a;
    --accent:  #d4d4d4;
    --link:    #7aafcf;
  }
}

/* ── Base ── */
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Site nav ── */
.site-nav {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--sans);
  font-size: 0.85rem;
}
.site-nav-name {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-nav-name:hover {
  text-decoration: none;
}
.site-nav-links {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
}
.site-nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.site-nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ── Shared interactive variables ── */
:root {
  --panel2:  #f0f0f0;
  --btn-accent: #f7931a;
  --blue:    #1a5276;
}
@media (prefers-color-scheme: dark) {
  :root {
    --panel2:  #1c1c1c;
    --blue:    #58a6ff;
  }
}

/* ── Shared controls ── */
.ctrl-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.6px; font-weight: 600; }
.ctrl-sep   { width: 1px; height: 20px; background: var(--border); flex-shrink: 0; }

.btn {
  padding: 4px 10px;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--sans);
  white-space: nowrap;
  user-select: none;
}
.btn:hover { background: var(--bg-alt); color: var(--text); border-color: var(--muted); }
.btn.active      { background: rgba(247,147,26,.12); border-color: var(--btn-accent); color: var(--btn-accent); }
.btn.active-blue { background: rgba(88,166,255,.10);  border-color: var(--blue);       color: var(--blue); }
.btn-group { display: flex; gap: 2px; }
.btn-group .btn             { border-radius: 0; }
.btn-group .btn:first-child { border-radius: 5px 0 0 5px; }
.btn-group .btn:last-child  { border-radius: 0 5px 5px 0; }

/* ── Site footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}