:root {
  color-scheme: light;
  --bg: #fffafa;
  --surface: #ffffff;
  --text: #252326;
  --muted: #716d70;
  --primary: #ff5575;
  --primary-soft: #fff0f3;
  --border: #eadfe2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

a { color: #c72f53; }

.container {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.hero {
  padding: 40px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: linear-gradient(145deg, var(--surface), var(--primary-soft));
}

.eyebrow {
  margin: 0;
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
}

h1 { margin: 0 0 20px; font-size: clamp(32px, 7vw, 52px); line-height: 1.3; }
h2 { margin-top: 40px; font-size: 22px; line-height: 1.5; }

.hero h1 { margin: 4px 0 12px; }
.hero p:last-child { margin: 0; color: var(--muted); }

.link-grid {
  display: grid;
  gap: 14px;
  margin: 28px 0 48px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.card:hover { border-color: var(--primary); transform: translateY(-1px); }
.card span, .updated { color: var(--muted); font-size: 14px; }
.mail { overflow-wrap: anywhere; font-size: 18px; font-weight: 700; }
.back { display: inline-block; margin-bottom: 28px; text-decoration: none; font-weight: 700; }
.document h1 { font-size: clamp(30px, 6vw, 44px); }
.document li + li { margin-top: 6px; }

footer {
  padding: 28px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}

@media (max-width: 520px) {
  .container { width: min(100% - 28px, 760px); padding-top: 28px; }
  .hero { padding: 26px 22px; border-radius: 18px; }
}