:root {
  --brand-primary: #d85626;
  --brand-primary-dark: #b8451d;
  --brand-dark: #111111;
  --brand-text: #1f2937;
  --muted: #64748b;
  --line: #e2e8f0;
  --surface: #ffffff;
  --page: #f8fafc;
  --radius: 18px;
  --shadow: 0 12px 32px rgba(17, 17, 17, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Nunito", system-ui, sans-serif;
  color: var(--brand-text);
  background: linear-gradient(180deg, #fff9f5, #f6f8ff);
  line-height: 1.55;
}

h1,
h2,
h3 {
  font-family: "Fredoka", system-ui, sans-serif;
  margin: 0 0 12px;
  line-height: 1.25;
  color: var(--brand-dark);
}

p {
  margin: 0 0 12px;
}

a {
  color: var(--brand-primary-dark);
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px 16px 64px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  width: 48px;
  height: 48px;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--brand-primary);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

.hero {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.kicker {
  margin: 0 0 6px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.notice {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 14px;
  padding: 12px 14px;
  margin-top: 14px;
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 16px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.toc h2 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.toc ol {
  margin: 0;
  padding-left: 18px;
  font-size: 0.92rem;
}

.toc a {
  text-decoration: none;
  color: var(--brand-text);
}

.toc a:hover {
  color: var(--brand-primary-dark);
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card h2 {
  font-size: 1.35rem;
  padding-bottom: 8px;
  border-bottom: 2px solid #fff1ea;
  margin-bottom: 14px;
}

.card h3 {
  font-size: 1.05rem;
  margin-top: 18px;
}

ul,
ol {
  margin: 0 0 12px;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 10px 0 16px;
}

th,
td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #fff7ed;
}

.footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}