:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #14213d;
  --muted: #5c667a;
  --line: #dfe6f0;
  --primary: #2457d6;
  --primary-dark: #173b96;
  --accent: #f6a623;
  --warning-bg: #fff4db;
  --warning-text: #6d4700;
  --shadow: 0 18px 50px rgba(20, 33, 61, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 10% 0%, rgba(36, 87, 214, 0.1), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
}

a {
  color: var(--primary);
  text-underline-offset: 0.2em;
}

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

.site-header {
  border-bottom: 1px solid rgba(223, 230, 240, 0.85);
  background: rgba(255, 255, 255, 0.92);
}

.header-inner,
.page,
.footer-inner {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.9rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover {
  color: var(--primary);
}

.page {
  padding: 64px 0 80px;
}

.hero {
  padding: 28px 0 36px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.4;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 7vw, 3.6rem);
  letter-spacing: -0.04em;
}

h2 {
  margin: 2.4rem 0 0.65rem;
  font-size: 1.35rem;
}

h3 {
  margin: 1.5rem 0 0.4rem;
  font-size: 1.05rem;
}

p,
ul,
ol {
  margin-top: 0.6rem;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
}

.card,
.document {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card {
  padding: 28px;
}

.document {
  padding: clamp(24px, 5vw, 56px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 26px;
}

.card h2 {
  margin-top: 0;
}

.button {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: var(--primary-dark);
  color: #fff;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.notice {
  margin: 0 0 28px;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: var(--warning-bg);
  color: var(--warning-text);
}

.contact-placeholder {
  padding: 2px 6px;
  border-radius: 5px;
  background: #ffe0e0;
  color: #8d1010;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.86rem;
}

@media (max-width: 700px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

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

  .page {
    padding-top: 34px;
  }
}