:root {
  color-scheme: light;
  --bg: #f5f8ff;
  --paper: #ffffff;
  --ink: #142033;
  --muted: #657286;
  --line: #d8e1ef;
  --blue: #2563eb;
  --green: #16a34a;
  --amber: #f59e0b;
  --red: #e11d48;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.75;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 2;
}

.nav {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1080px;
  padding: 14px 20px;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: flex;
  font-weight: 800;
  gap: 10px;
}

.brand img {
  border-radius: 10px;
  height: 36px;
  width: 36px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
}

.hero,
.content {
  margin: 0 auto;
  max-width: 1080px;
  padding: 56px 20px;
}

.hero {
  align-items: center;
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr) 340px;
}

.eyebrow {
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 12px;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0;
}

h1 {
  font-size: 42px;
}

h2 {
  font-size: 28px;
  margin-bottom: 18px;
}

h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

p {
  margin: 0 0 16px;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin-top: 18px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  border: 1px solid var(--blue);
  border-radius: 8px;
  display: inline-block;
  font-weight: 700;
  padding: 10px 16px;
}

.button.primary {
  background: var(--blue);
  color: #ffffff;
}

.phone {
  background: #eaf2ff;
  border: 1px solid #c4d4ea;
  border-radius: 28px;
  box-shadow: 0 22px 50px rgba(37, 99, 235, 0.16);
  padding: 18px;
}

.phone-bar {
  background: var(--blue);
  border-radius: 18px 18px 8px 8px;
  color: #ffffff;
  font-weight: 800;
  padding: 16px;
}

.phone-body {
  padding: 18px 4px 0;
}

.quiz-kanji {
  font-size: 52px;
  font-weight: 800;
  margin: 16px 0;
  text-align: center;
}

.choice,
.mini-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 10px;
  padding: 12px 14px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.legal {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.legal section + section {
  border-top: 1px solid var(--line);
  margin-top: 22px;
  padding-top: 22px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  margin: 24px auto 0;
  max-width: 1080px;
  padding: 24px 20px 40px;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 36px;
  }

  h1 {
    font-size: 34px;
  }

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