:root {
  --sky: #cfeaf1;
  --cream: #f6efe3;
  --card: #ffffff;
  --ink: #171717;
  --muted: #5f5a54;
  --teal: #2a6f78;
  --line: rgba(23, 23, 23, 0.08);
  --shadow: 0 10px 28px rgba(23, 23, 23, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--cream);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
  line-height: 1.65;
}

body { min-height: 100vh; }

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 36px;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  text-decoration: none;
}

nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; }

h1 { font-size: 34px; line-height: 1.25; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 28px 0 10px; }
p { color: var(--ink); margin-bottom: 12px; }
.lead { font-size: 18px; color: var(--muted); margin-bottom: 28px; }

.card {
  background: var(--card);
  border-radius: 24px;
  padding: 22px 22px 18px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card h2 { margin-top: 0; }
.card ul { padding-left: 18px; color: var(--muted); }
.card li { margin: 6px 0; }

.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 15px;
  text-decoration: none;
  margin: 8px 8px 0 0;
}

.btn:hover { text-decoration: none; opacity: 0.9; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); }

.grid { display: grid; gap: 14px; }
@media (min-width: 640px) {
  .grid.two { grid-template-columns: 1fr 1fr; }
}

.muted { color: var(--muted); }
.small { font-size: 14px; color: var(--muted); }

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}