:root {
  --brand: #f3811e;
  --brand-dark: #c96a18;
  --brand-bg: #fdf5eb;
  --text: #3d3d3d;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --surface: #f8fafc;
  --card: #ffffff;
  --radius: 14px;
  --max: 920px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "DM Sans", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
}

a {
  color: var(--brand-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--brand);
}

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}

.logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 0.85rem;
}

.header-links a {
  margin-left: 1rem;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
}

.header-links a:hover {
  color: var(--brand);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3.5rem;
}

.hero {
  margin-bottom: 1.75rem;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.2;
  color: var(--brand-dark);
  letter-spacing: -0.02em;
}

.hero .meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.apps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.apps li {
  background: var(--brand-bg);
  border: 1px solid #fcd9b8;
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  box-shadow: 0 8px 24px rgba(61, 61, 61, 0.06);
}

.card + .card {
  margin-top: 1.25rem;
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  color: var(--text);
  line-height: 1.35;
}

.card h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
  color: var(--brand-dark);
}

.card p {
  margin: 0 0 0.85rem;
}

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

.card ul {
  margin: 0 0 0.85rem;
  padding-left: 1.35rem;
}

.card li {
  margin-bottom: 0.4rem;
}

.app-block {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border-radius: 10px;
  border-left: 4px solid var(--brand);
}

.app-block h3 {
  margin-top: 0;
}

.app-block p:last-child,
.app-block ul:last-child {
  margin-bottom: 0;
}

.toc {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.toc ol {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.toc a {
  text-decoration: none;
  font-weight: 500;
}

.toc a:hover {
  text-decoration: underline;
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
}

@media (max-width: 600px) {
  .header-links {
    display: none;
  }

  .card {
    padding: 1.25rem 1rem;
  }
}