:root {
  --app-bg: #f8fafc;
  --surface: #ffffff;
  --surface-muted: #f1f5f9;
  --border: #e2e8f0;
  --text-main: #1e293b;
  --text-sub: #64748b;
  --text-soft: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --float-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--app-bg);
  color: var(--text-main);
  font-family:
    "Hiragino Sans",
    "Yu Gothic",
    "Meiryo",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
}

.guide-shell {
  min-height: 100dvh;
  background:
    radial-gradient(circle at top, rgba(59, 130, 246, 0.08), transparent 32%),
    var(--app-bg);
}

.guide-main {
  width: min(720px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.guide-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.guide-link {
  text-decoration: none;
}

.hero-card,
.note-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--card-shadow);
}

.hero-card {
  display: flex;
  gap: 16px;
  padding: 24px;
  margin-bottom: 28px;
}

.hero-card__accent {
  width: 4px;
  min-height: 24px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--primary), var(--primary-hover));
}

.hero-card__body {
  min-width: 0;
}

.hero-card__eyebrow {
  margin: 0 0 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.hero-card__title {
  margin: 0;
  font-size: clamp(28px, 5vw, 32px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--text-main);
}

.hero-card__subtitle {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-sub);
}

.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-sub);
  box-shadow: var(--float-shadow);
  backdrop-filter: blur(12px);
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    color 160ms ease;
}

.action-button:hover {
  background: var(--surface);
  color: #334155;
}

.action-button--primary {
  border-color: transparent;
  background: var(--primary);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
}

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

.guide-article {
  padding: 24px;
}

.guide-article + .guide-article {
  margin-top: 16px;
}

.guide-article h2,
.guide-article h3 {
  margin: 0;
  color: var(--text-main);
}

.guide-article h2 {
  font-size: 20px;
}

.guide-article h3 {
  margin-top: 18px;
  font-size: 16px;
}

.guide-article p,
.guide-article li {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-sub);
}

.guide-article p {
  margin: 12px 0 0;
}

.guide-article ul {
  margin: 12px 0 0;
  padding-left: 1.2rem;
}

.guide-article li + li {
  margin-top: 8px;
}

.guide-article strong {
  color: var(--text-main);
}

.guide-article a {
  color: var(--primary);
}

@media (min-width: 768px) {
  .guide-main {
    width: min(960px, calc(100vw - 64px));
    padding-top: 40px;
  }
}