:root {
  color-scheme: light dark;
  --bg: #fff8f3;
  --surface: #ffffff;
  --text: #2d1c16;
  --muted: #6f5a52;
  --primary: #ef6f5e;
  --primary-hover: #e15541;
  --border: #f1ddd5;
  --max-width: 960px;
  --shadow: 0 8px 24px rgb(0 0 0 / 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171312;
    --surface: #221b19;
    --text: #f8ece9;
    --muted: #d6bcb3;
    --primary: #ff8f7f;
    --primary-hover: #ff775f;
    --border: #473832;
    --shadow: 0 10px 28px rgb(0 0 0 / 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
}

.container {
  width: min(var(--max-width), 92vw);
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

.nav-link {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

.nav-link:hover {
  color: var(--text);
}

.hero {
  padding: 72px 0 36px;
}

.hero-card,
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 32px;
}

.hero h1 {
  margin: 0 0 14px;
  line-height: 1.25;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-block;
  border-radius: 999px;
  padding: 10px 18px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
}

.section {
  padding: 12px 0 32px;
}

.section h2 {
  margin: 0 0 12px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-item {
  padding: 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 90%, var(--bg));
}

.feature-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
}

.content-card {
  margin: 28px 0;
  padding: 26px;
}

.content-card h1,
.content-card h2,
.content-card h3 {
  line-height: 1.35;
}

.content-card h1 {
  margin-top: 0;
}

.content-card table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 18px;
}

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

.content-card ul,
.content-card ol {
  padding-left: 20px;
}

.muted {
  color: var(--muted);
}

.page-footer {
  padding: 18px 0 38px;
  color: var(--muted);
  font-size: 0.92rem;
}

details {
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  margin-top: 18px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

@media (max-width: 780px) {
  .hero {
    padding-top: 44px;
  }

  .hero-card,
  .content-card {
    padding: 20px;
    border-radius: 14px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.65rem;
  }
}