:root {
  color-scheme: light;
  --page: #f5f8fc;
  --surface: #ffffff;
  --surface-2: #eef4fb;
  --text-primary: #15202b;
  --text-secondary: #3d4f5f;
  --text-muted: #5a6b7a;
  --border: rgba(21, 32, 43, 0.1);
  --accent: #2b87ee;
  --accent-wash: #e6f2fd;
  --success-bg: #e8f5ec;
  --success-text: #1f5c33;
  --warn-bg: #fff4e5;
  --warn-text: #7a4e00;
  --ui-btn-h: 44px;
  --ui-btn-radius: 12px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--page);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 56px;
}

.site-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.site-header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  margin-bottom: 8px;
}
.brand-wordmark {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1.1;
}
.brand-sub {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 2px;
}
.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.header-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: var(--ui-btn-radius);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
.header-link:hover {
  background: var(--surface-2);
  text-decoration: none;
}
.header-link-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.header-link-primary:hover { filter: brightness(1.04); background: var(--accent); }

.page-title { margin: 0 0 6px; font-size: 26px; line-height: 1.25; }
.page-lead { margin: 0 0 20px; color: var(--text-secondary); font-size: 15px; }

.guide-toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 28px;
}
.guide-toc-title {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}
.guide-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.guide-toc-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}
.guide-toc-list a:hover { background: var(--accent-wash); color: var(--accent); text-decoration: none; }

.guide-section {
  margin-bottom: 36px;
  scroll-margin-top: 16px;
}
.guide-section h2 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.35;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-wash);
}
.guide-section h3 {
  margin: 20px 0 8px;
  font-size: 16px;
  line-height: 1.4;
}
.guide-section p,
.guide-section li {
  font-size: 14px;
  color: var(--text-secondary);
}
.guide-section ul,
.guide-section ol {
  padding-left: 1.25em;
  margin: 8px 0 12px;
}
.guide-section li + li { margin-top: 4px; }

.ui-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 12px 0;
}
.ui-box-soft {
  background: var(--surface-2);
  border-color: transparent;
}
.ui-box-warn {
  background: var(--warn-bg);
  border-color: rgba(122, 78, 0, 0.15);
}
.ui-box-warn p { color: var(--warn-text); }
.ui-box-ok {
  background: var(--success-bg);
  border-color: rgba(31, 92, 51, 0.12);
}
.ui-box-ok p { color: var(--success-text); }

.flow-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 12px 0;
}
.flow-steps li {
  counter-increment: step;
  position: relative;
  padding-left: 36px;
  margin-bottom: 10px;
}
.flow-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: var(--accent-wash);
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

kbd, .ui-label {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: inherit;
}

.faq-item { margin-bottom: 18px; }
.faq-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--text-primary);
}
.faq-item p { margin: 0; }

.site-footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 0;
  margin-bottom: 8px;
}
.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
}
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.site-footer-sep { margin: 0 8px; color: var(--text-muted); }
.site-footer-copy { margin: 0; font-size: 11px; }

@media (max-width: 640px) {
  .page-title { font-size: 22px; }
  .guide-toc-list a { font-size: 12px; min-height: 34px; }
}