:root {
  --bg-soft: #f9fbff;
  --text: #1d2b45;
  --muted: #55657d;
  --line: #d8e2f0;
  --accent: #2a7fff;
  --accent-hover: #1d63c7;
  --accent-warm: #e48a00;
  --card: rgba(255, 255, 255, 0.95);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #fff5e5 0%, #f3f8ff 45%, var(--bg-soft) 100%);
  line-height: 1.7;
}

.container {
  width: min(100% - 2rem, 800px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -100%;
  background: #111827;
  color: #ffffff;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  padding: 1.5rem 0 1.1rem;
  border-bottom: 1px solid #dbe4f2;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.55rem, 4.5vw, 2rem);
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.app-name-en {
  margin: -0.15rem 0 0.45rem;
  color: var(--muted);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.2rem, 3.2vw, 1.4rem);
  line-height: 1.4;
  color: #253a5b;
}

h2::after {
  content: "";
  display: block;
  width: 2.2rem;
  height: 0.2rem;
  margin-top: 0.45rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-warm) 100%);
}

.lead {
  margin: 0.5rem 0 1rem;
  color: var(--muted);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: inline-block;
  padding: 0.42rem 0.78rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--accent);
  background: rgba(255, 255, 255, 0.96);
}

.nav-list a[aria-current="page"] {
  background: #fff2db;
  border-color: #f4cd92;
  color: #7a4900;
  font-weight: 700;
}

main {
  padding: 1.25rem 0 2rem;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.05rem;
  margin-bottom: 0.9rem;
  box-shadow: 0 4px 14px rgba(29, 43, 69, 0.06);
}

p {
  margin: 0.4rem 0 0;
}

ul,
ol {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

a {
  color: var(--accent);
}

a:hover,
a:focus-visible {
  color: var(--accent-hover);
}

a:focus-visible {
  outline: 3px solid #8db8ff;
  outline-offset: 2px;
}

.faq-list {
  margin: 0.4rem 0 0;
}

.faq-list dt {
  font-weight: 700;
  margin-top: 0.8rem;
}

.faq-list dt:first-child {
  margin-top: 0;
}

.faq-list dd {
  margin: 0.25rem 0 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1rem 0 1.5rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  body {
    line-height: 1.75;
  }

  section {
    padding: 0.9rem;
  }
}