:root {
  --navy: #12395b;
  --blue: #1f5f96;
  --text: #1f2937;
  --muted: #5f6b7a;
  --line: #d9e3ec;
  --white: #ffffff;
  --shadow: 0 10px 30px rgba(18, 57, 91, 0.08);
  --radius: 24px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #f7fbff;
  line-height: 1.7;
}

html[lang="ja"] body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.8;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

/* Header */

.site-header {
  background: linear-gradient(135deg, #103454 0%, #1b5f92 100%);
  color: var(--white);
  padding-bottom: 70px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.brand img {
  height: 60px;
}

/* Navigation */

.header-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav {
  display: flex;
  gap: 28px;
  font-weight: 600;
}

.nav a {
  color: rgba(255,255,255,0.9);
}

.nav a:hover {
  color: #ffffff;
}

/* Language switch */

.lang-switch {
  display: flex;
  gap: 10px;
}

.lang-switch a,
.lang-switch span {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.4);
  font-size: 14px;
}

.lang-switch .active {
  background: #ffffff;
  color: var(--navy);
}

/* Hero */

.hero {
  max-width: 900px;
  padding-top: 40px;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: 48px;
  margin: 0 0 16px;
}

.hero p {
  font-size: 20px;
  color: rgba(255,255,255,0.9);
}

/* Main */

main {
  margin-top: -30px;
}

.panel {
  background: #ffffff;
  border-radius: 20px;
  padding: 36px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

h2 {
  color: var(--navy);
  margin-top: 0;
}

/* Grid */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

/* Cards */

.card {
  background: #ffffff;
  border-radius: 18px;
  padding: 22px;
  border: 1px solid var(--line);
}

.card h3 {
  margin-top: 0;
  color: var(--navy);
}

/* Highlight band */

.highlight-band {
  background: linear-gradient(135deg, #0f3555 0%, #1f6ba7 100%);
  color: #ffffff;
  border-radius: 20px;
  padding: 34px;
  margin-top: 30px;
}

.highlight-band h2 {
  color: #ffffff;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.mini-card {
  background: rgba(255,255,255,0.1);
  padding: 18px;
  border-radius: 14px;
}

/* Forms */

form {
  display: grid;
  gap: 14px;
}

input,
textarea {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.button {
  background: var(--navy);
  color: #ffffff;
  border: none;
  padding: 12px 18px;
  border-radius: 20px;
  font-weight: bold;
  cursor: pointer;
}

/* Footer */

.site-footer {
  padding: 40px 0;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-inner div:last-child {
  max-width: 70%;
  text-align: right;
}

/* Responsive */

@media (max-width: 900px) {
  .header-right {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .footer-inner div:last-child {
    max-width: 100%;
    text-align: left;
  }

  .grid-3,
  .grid-2,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}