:root {
  --color-primary: #16384a;
  --color-primary-light: #1f4f68;
  --color-accent: #b7472a;
  --color-bg: #f6f7f5;
  --color-surface: #ffffff;
  --color-text: #2a2f33;
  --color-text-muted: #5b6367;
  --color-border: #dfe3e2;
  --radius: 8px;
  --max-width: 760px;
}

* { box-sizing: border-box; }

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 48px 0 40px;
}

.site-header__eyebrow {
  margin: 0 0 8px;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: #cfe0e8;
}

.site-header__title {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

/* Main content */
main {
  padding: 40px 0 64px;
}

.lead {
  font-size: 1.0625rem;
  margin-bottom: 32px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  margin-bottom: 24px;
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  border-left: 4px solid var(--color-primary-light);
  padding-left: 12px;
}

.card p {
  margin: 0 0 12px;
}

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

.card ul,
.card ol {
  margin: 0 0 12px;
  padding-left: 1.25em;
}

.card ul:last-child,
.card ol:last-child {
  margin-bottom: 0;
}

.card li {
  margin-bottom: 8px;
}

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

.card li ul,
.card li ol {
  margin-top: 8px;
}

.text-accent {
  color: var(--color-accent);
}

.card--action {
  background: #eef4f7;
  border-color: var(--color-primary-light);
}

.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 999px;
}

.btn:hover,
.btn:focus {
  background: var(--color-primary-light);
}

.back-link {
  margin: 8px 0 0;
}

.back-link a {
  color: var(--color-primary-light);
  text-decoration: none;
  font-weight: 500;
}

.back-link a:hover,
.back-link a:focus {
  text-decoration: underline;
}

.card--notice h2 {
  border-left-color: var(--color-accent);
  color: var(--color-accent);
}

.card--notice ul {
  margin: 0;
  padding-left: 1.25em;
}

.card--notice li {
  margin-bottom: 10px;
  color: var(--color-text);
}

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

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li {
  border-bottom: 1px solid var(--color-border);
}

.link-list li:last-child {
  border-bottom: none;
}

.link-list a {
  display: block;
  padding: 12px 4px;
  color: var(--color-primary-light);
  text-decoration: none;
  font-weight: 500;
}

.link-list a:hover,
.link-list a:focus {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  background: #1a1f22;
  color: #b7bdc1;
  font-size: 0.8125rem;
  padding: 32px 0;
}

.site-footer p {
  margin: 0 0 6px;
}

.site-footer__copy {
  margin-top: 12px;
  color: #7c8489;
}

@media (max-width: 480px) {
  .site-header { padding: 36px 0 28px; }
  .site-header__title { font-size: 1.4rem; }
  .card { padding: 20px 20px 18px; }
}