:root {
  color-scheme: light dark;
  --bg: #f0f4fa;
  --card: #ffffff;
  --text: #141820;
  --muted: #5c6570;
  --blue: #0078ff;
  --cyan: #00b4ff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0, 120, 255, 0.08);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0e12;
    --card: #171a21;
    --text: #eef2f7;
    --muted: #9aa3b2;
    --border: #2a3140;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

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

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.top-bar {
  margin-bottom: 1.5rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

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

.page-hero {
  margin-bottom: 1.75rem;
}

.page-hero .label {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(0, 120, 255, 0.12), rgba(0, 180, 255, 0.12));
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.page-hero h1 {
  margin: 0 0 0.5rem;
  font-size: 1.9rem;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.page-hero .lead {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.updated {
  margin-top: 0.65rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow);
}

.article section + section {
  margin-top: 1.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border);
}

.article h2 {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
}

.article p {
  margin: 0 0 0.8rem;
  font-size: 0.94rem;
}

.article p:last-child {
  margin-bottom: 0;
}

.article ul,
.article ol {
  margin: 0 0 0.8rem;
  padding-left: 1.25rem;
  font-size: 0.94rem;
}

.article li + li {
  margin-top: 0.45rem;
}

.callout {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 120, 255, 0.08), rgba(0, 180, 255, 0.06));
  border: 1px solid rgba(0, 120, 255, 0.15);
  font-size: 0.92rem;
}

.callout p {
  margin: 0 0 0.5rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.site-footer nav a {
  color: var(--muted);
  text-decoration: none;
}

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

/* Home hub */
.home-hero {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.logo-mark {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 1.75rem;
  font-weight: 800;
  box-shadow: 0 8px 28px rgba(0, 120, 255, 0.35);
}

.home-hero h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  letter-spacing: -0.03em;
}

.home-hero .tagline {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--muted);
  font-size: 1rem;
}

.hub-grid {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.hub-card {
  display: block;
  padding: 1.15rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, transform 0.15s;
}

.hub-card:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
}

.hub-card-featured {
  border-color: rgba(0, 120, 255, 0.25);
  background: linear-gradient(160deg, rgba(0, 120, 255, 0.04), rgba(0, 180, 255, 0.03));
}

.hub-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.hub-card h2 {
  margin: 0;
  font-size: 1.05rem;
}

.hub-card .arrow {
  color: var(--blue);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.hub-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.hub-icon {
  font-size: 1.35rem;
  margin-right: 0.5rem;
}

/* Support page */
.support-grid {
  display: grid;
  gap: 0.75rem;
}

.support-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s;
}

.support-btn:hover {
  border-color: var(--blue);
}

.support-btn strong {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.95rem;
}

.support-btn span {
  color: var(--muted);
  font-size: 0.86rem;
}

.support-btn .emoji {
  font-size: 1.4rem;
  line-height: 1;
}