:root {
  --bg: #0f172a;
  --bg-elevated: #16213e;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --border: rgba(148, 163, 184, 0.16);
  --radius: 12px;
  --max-width: 1100px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #e3f2fd;
    --bg-elevated: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --accent: #0284c7;
    --accent-soft: rgba(2, 132, 199, 0.08);
    --border: rgba(15, 23, 42, 0.1);
  }
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark light;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
}

.site-logo {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: 56px;
}

@media (min-width: 1008px) {
  .site-logo {
    left: 98px;
  }
}

@media (prefers-color-scheme: dark) {
  .site-logo {
    filter: invert(1);
  }
}

a {
  color: var(--accent);
}

.back-link {
  display: block;
  text-align: right;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.back-link:hover {
  color: var(--accent);
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: underline;
}

.site-footer a:hover {
  color: var(--accent);
}

.top-link {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.top-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}