:root {
  --oo-color-base: #202122;
  --oo-color-subtle: #54595d;
  --oo-color-placeholder: #72777d;
  --oo-color-progressive: #36c;
  --oo-color-progressive-hover: #2a4b8d;
  --oo-color-link: #36c;
  --oo-color-link-hover: #2a4b8d;
  --oo-color-border: #a2a9b1;
  --oo-color-border-light: #c8ccd1;
  --oo-color-surface: #fff;
  --oo-color-surface-alt: #f8f9fa;
  --oo-color-surface-hover: #eaecf0;
  --oo-shadow-card: 0 1px 2px rgba(0, 0, 0, .08);
  --oo-radius: 2px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: var(--oo-color-base);
  background: var(--oo-color-surface-alt);
}

* { box-sizing: border-box; }
html { min-width: 320px; }
body { margin: 0; min-height: 100vh; background: var(--oo-color-surface-alt); }
a { color: var(--oo-color-link); }
a:hover { color: var(--oo-color-link-hover); }
:focus-visible { outline: 2px solid var(--oo-color-progressive); outline-offset: 2px; }

.site-header { background: var(--oo-color-surface); border-bottom: 1px solid var(--oo-color-border-light); }
.site-header__inner, .site-footer__inner { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.site-header__inner { min-height: 64px; display: flex; align-items: center; gap: 40px; }
.wordmark { color: var(--oo-color-base); font-size: 1.2rem; font-weight: 700; text-decoration: none; letter-spacing: .02em; }
.site-nav { display: flex; align-self: stretch; gap: 4px; }
.site-nav__link { display: inline-flex; align-items: center; padding: 0 14px; color: var(--oo-color-subtle); text-decoration: none; font-size: .9rem; border-bottom: 3px solid transparent; }
.site-nav__link:hover, .site-nav__link.is-active { color: var(--oo-color-base); background: var(--oo-color-surface-hover); }
.site-nav__link.is-active { border-bottom-color: var(--oo-color-progressive); }
.page-shell { max-width: 1120px; margin: 0 auto; padding: 56px 24px 80px; }
.hero { max-width: 720px; margin-bottom: 64px; }
.hero--compact { margin-bottom: 44px; }
.eyebrow { margin: 0 0 10px; color: var(--oo-color-subtle); font-size: .75rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 16px; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.2; letter-spacing: -.03em; }
h2 { margin-bottom: 0; font-size: 1.4rem; line-height: 1.35; }
.hero__lead { max-width: 620px; margin: 0; color: var(--oo-color-subtle); font-size: 1.05rem; line-height: 1.8; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.status-chip { display: inline-flex; align-items: center; min-height: 28px; padding: 0 10px; color: var(--oo-color-subtle); background: var(--oo-color-surface-hover); border-radius: 999px; font-size: .78rem; white-space: nowrap; }
.card-grid, .tool-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.category-card, .tool-card { display: flex; gap: 18px; min-height: 156px; padding: 24px; color: var(--oo-color-base); background: var(--oo-color-surface); border: 1px solid var(--oo-color-border-light); border-radius: var(--oo-radius); box-shadow: var(--oo-shadow-card); text-decoration: none; transition: border-color .15s, box-shadow .15s, transform .15s; }
.category-card:hover, .tool-card:hover { color: var(--oo-color-base); border-color: var(--oo-color-progressive); box-shadow: 0 3px 8px rgba(0, 0, 0, .12); transform: translateY(-2px); }
.category-card--planned { color: var(--oo-color-subtle); background: transparent; border-style: dashed; box-shadow: none; }
.category-card__icon { display: grid; flex: 0 0 44px; place-items: center; width: 44px; height: 44px; color: var(--oo-color-progressive); background: #eaf3ff; border-radius: 50%; font-size: 1.2rem; font-weight: 700; }
.category-card__body, .tool-card__body { display: flex; flex: 1; flex-direction: column; gap: 8px; }
.category-card__title, .tool-card__title { font-size: 1.1rem; font-weight: 700; }
.category-card__description, .tool-card__description { color: var(--oo-color-subtle); font-size: .9rem; line-height: 1.6; }
.category-card__meta { margin-top: auto; color: var(--oo-color-placeholder); font-size: .78rem; }
.category-card__arrow { align-self: center; color: var(--oo-color-progressive); font-size: 1.25rem; }
.tool-card { min-height: 180px; }
.tool-card__number { color: var(--oo-color-placeholder); font-family: ui-monospace, monospace; font-size: .8rem; }
.tool-card__link { margin-top: auto; color: var(--oo-color-link); font-size: .85rem; font-weight: 700; }
.breadcrumb { display: flex; gap: 10px; margin-bottom: 32px; color: var(--oo-color-subtle); font-size: .85rem; }
.breadcrumb a { text-decoration: none; }
.info-panel { max-width: 720px; margin-top: 64px; padding: 24px; background: #eaf3ff; border-left: 4px solid var(--oo-color-progressive); }
.info-panel h2 { margin-bottom: 8px; font-size: 1.1rem; }
.info-panel p:last-child { margin: 0; color: var(--oo-color-subtle); line-height: 1.7; }
.site-footer { border-top: 1px solid var(--oo-color-border-light); background: var(--oo-color-surface); }
.site-footer__inner { display: flex; justify-content: space-between; gap: 20px; padding-top: 20px; padding-bottom: 20px; color: var(--oo-color-subtle); font-size: .8rem; }
.site-footer a { text-decoration: none; }

/* Compatibility styles for the existing static tools. */
body:has(.background-blobs) { display: block; padding: 0; color: var(--oo-color-base); }
.background-blobs { display: none; }
.container { position: relative; z-index: 1; width: min(900px, calc(100% - 32px)); max-width: 900px; margin: 0 auto; padding: 48px 0 64px; }
.container > header { margin-bottom: 32px; text-align: left; }
.container h1 { color: var(--oo-color-base); background: none; -webkit-text-fill-color: currentColor; font-size: clamp(1.8rem, 4vw, 2.4rem); }
.container .subtitle { color: var(--oo-color-subtle); text-transform: none; letter-spacing: 0; }
.card { background: var(--oo-color-surface); border: 1px solid var(--oo-color-border-light); border-radius: var(--oo-radius); padding: 24px; margin-bottom: 16px; box-shadow: var(--oo-shadow-card); }
.card:hover { transform: none; box-shadow: 0 3px 8px rgba(0, 0, 0, .12); }
.container input, .container textarea { color: var(--oo-color-base); background: var(--oo-color-surface); border: 1px solid var(--oo-color-border); border-radius: var(--oo-radius); }
.container input:focus, .container textarea:focus { background: var(--oo-color-surface); border-color: var(--oo-color-progressive); box-shadow: 0 0 0 1px var(--oo-color-progressive); }
.btn { border-radius: var(--oo-radius); border: 1px solid var(--oo-color-border); padding: 8px 16px; font-size: .9rem; font-weight: 700; }
.btn.primary { color: #fff; background: var(--oo-color-progressive); border-color: var(--oo-color-progressive); box-shadow: none; }
.btn.primary:hover { background: var(--oo-color-progressive-hover); filter: none; }
.btn.secondary { color: var(--oo-color-base); background: var(--oo-color-surface); }
.btn.secondary:hover { background: var(--oo-color-surface-hover); }
.btn.text-btn { color: var(--oo-color-link); }
.nav-links { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0 0 20px; }
.nav-links a { padding: 6px 0; color: var(--oo-color-link); font-size: .9rem; font-weight: 600; text-decoration: none; }
.nav-links a:hover { text-decoration: underline; }
.output-header { gap: 16px; }
.json-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.output-header h2 { color: var(--oo-color-base); }
.station-card, .entry-row { background: var(--oo-color-surface-alt) !important; border-color: var(--oo-color-border-light) !important; border-radius: var(--oo-radius) !important; }
.add-row-btn { width: 100%; margin-top: 16px; }
.remove-btn, .btn-icon { color: var(--oo-color-subtle); background: var(--oo-color-surface); border: 1px solid var(--oo-color-border); border-radius: var(--oo-radius); cursor: pointer; }
.remove-btn:hover, .btn-icon:hover { color: var(--oo-color-base); background: var(--oo-color-surface-hover); }
.autocomplete-list { color: var(--oo-color-base); background: var(--oo-color-surface); border: 1px solid var(--oo-color-border); box-shadow: var(--oo-shadow-card); }
.autocomplete-item { padding: 8px 10px; cursor: pointer; }
.autocomplete-item:hover { background: var(--oo-color-surface-hover); }
@media (max-width: 680px) {
  .site-header__inner { gap: 20px; padding: 0 16px; }
  .site-nav__link { padding: 0 8px; }
  .page-shell { padding: 40px 16px 56px; }
  .card-grid, .tool-list { grid-template-columns: 1fr; }
  .section-heading { align-items: start; flex-direction: column; gap: 12px; }
  .site-footer__inner { align-items: flex-start; flex-direction: column; padding-right: 16px; padding-left: 16px; }
  .container { width: calc(100% - 32px); padding-top: 32px; }
  .actions { flex-direction: column; }
}