:root {
  --navy: #0b2450;
  --ink: #18345f;
  --body: #4d617b;
  --muted: #7f8da2;
  --line: #e1ebf7;
  --soft-line: #eef4fb;
  --blue: #1768dc;
  --white: #fff;
  --shadow: 0 14px 36px rgb(6 27 73 / 5%);
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}
* { box-sizing: border-box; }
html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--body);
  background: linear-gradient(180deg, #fbfdff 0%, #fff 42%, #f8fbff 100%);
  letter-spacing: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--navy); }
p { line-height: 1.8; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgb(255 255 255 / 94%);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.header-inner {
  width: min(1420px, calc(100% - 48px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
  font-size: 30px;
  font-weight: 700;
  white-space: nowrap;
}
.brand-icon {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border-radius: 8px;
  object-fit: contain;
}
.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 2.8vw, 42px);
  color: var(--navy);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}
.desktop-nav a { padding: 24px 0; }
.desktop-nav a[aria-current="page"] { color: var(--blue); }
.hero,
.faq-wrap {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}
.hero {
  padding: 62px 0 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 44px;
  align-items: center;
}
.hero-kicker {
  color: var(--blue);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(34px, 3.45vw, 48px);
  font-weight: 700;
  line-height: 1.18;
  margin-bottom: 18px;
}
.hero p {
  max-width: 740px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 0;
  overflow-wrap: anywhere;
}
.faq-visual {
  width: 100%;
  min-height: 230px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 14px;
  border-radius: 28px;
  border: 1px solid var(--soft-line);
  background: linear-gradient(135deg, #f0f6ff, #fff);
  box-shadow: var(--shadow);
}
.faq-visual span {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: #7ca3e9;
  font-size: 34px;
  font-weight: 700;
}
.faq-visual b {
  color: var(--navy);
  font-size: 34px;
}
.faq-panel {
  margin: 0 auto 64px;
  padding: 38px 46px;
  border: 1px solid var(--soft-line);
  border-radius: 28px;
  background: rgb(255 255 255 / 94%);
  box-shadow: var(--shadow);
}
.faq-panel h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 22px;
}
.faq-list {
  display: grid;
  gap: 0;
}
.faq-list details {
  border-top: 1px solid var(--line);
  background: #fff;
}
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 22px 4px;
  color: var(--navy);
  font-size: 16px;
  font-weight: 700;
  overflow-wrap: anywhere;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  justify-self: end;
  color: var(--blue);
}
.faq-list details[open] summary::after { content: "-"; }
.faq-list .answer {
  max-width: 980px;
  color: var(--body);
  font-size: 14px;
  font-weight: 400;
  margin: 0;
  padding: 0 4px 22px;
  overflow-wrap: anywhere;
}
.faq-list .answer a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.site-footer {
  padding: 28px 20px 36px;
  color: #fff;
  text-align: center;
  background: var(--navy);
}
.site-footer p { margin: 0; font-size: 13px; }
@media (max-width: 760px) {
  .desktop-nav { display: none; }
  .header-inner,
  .hero,
  .faq-wrap {
    width: min(1180px, calc(100% - 28px));
  }
  .brand { font-size: 28px; }
  .brand-icon { width: 28px; height: 28px; border-radius: 7px; }
  .hero {
    grid-template-columns: 1fr;
    padding: 42px 0 24px;
    gap: 26px;
  }
  .hero h1 { font-size: 34px; }
  .hero p {
    font-size: 15px;
    word-break: break-all;
  }
  .faq-visual { min-height: 180px; }
  .faq-panel {
    padding: 26px 20px;
    border-radius: 22px;
  }
  .faq-list summary {
    gap: 12px;
    font-size: 15px;
    line-height: 1.6;
    padding: 18px 0;
    word-break: break-all;
  }
  .faq-list .answer {
    font-size: 14px;
    padding: 0 0 18px;
    word-break: break-all;
  }
}
@media (max-width: 520px) {
  .header-inner,
  .hero,
  .faq-wrap {
    width: min(362px, calc(100% - 28px));
    margin-left: 14px;
    margin-right: auto;
  }
  .faq-panel { padding: 24px 18px; }
}