:root {
  color-scheme: light dark;
  --fg: #111827;
  --bg: #ffffff;
  --surface: #ffffff;
  --accent: #0b57d0;
  --primary-bg: #0b57d0;
  --primary-hover-bg: #084abc;
  --primary-fg: #ffffff;
  --muted: #64748b;
  --card: #f6f8fa;
  --border: #d0d7de;
  --shadow: 0 12px 32px rgba(12, 20, 33, 0.08);
  --banner-bg: rgba(16, 24, 40, 0.95);
  --banner-text: #f8fafc;
  --banner-link: #bfdbfe;
}
:root.dark {
  --fg: #e6edf3;
  --bg: #051429;
  --surface: rgba(11, 31, 51, 0.92);
  --accent: #5ea0ff;
  --primary-bg: #245dff;
  --primary-hover-bg: #1a4be8;
  --primary-fg: #ffffff;
  --muted: #94a3c1;
  --card: rgba(11, 31, 51, 0.72);
  --border: #1e2d45;
  --shadow: 0 14px 36px rgba(4, 10, 25, 0.55);
  --banner-bg: rgba(7, 17, 29, 0.95);
  --banner-text: #e6edf3;
  --banner-link: #93c5fd;
}
* { box-sizing: border-box; }
html, body { padding:0; margin:0; background:var(--bg); color:var(--fg); font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif; transition: background-color 0.3s ease, color 0.3s ease; }
a { color: var(--accent); transition: color 0.2s ease; }
:root.dark a { color: #8bb4ff; }
header, footer { padding: 16px; }
main { padding: 16px; }
.container { max-width: 960px; margin: 0 auto; }
.hero { padding: 16px 0 0; }
.lang-switch { margin-top: 8px; }
.lang-switch a.is-current { font-weight: 600; text-decoration: none; cursor: default; color: var(--fg); }
.lang-switch a.is-current:hover { text-decoration: none; }
.lang-switch a.is-disabled { color: var(--muted); cursor: not-allowed; opacity: 0.6; text-decoration: none; }
.lang-switch a.is-disabled:hover { text-decoration: none; }
.lang-switch .theme-toggle { margin-left: 8px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin: 16px 0; box-shadow: var(--shadow); }
.label { display:block; margin:8px 0 4px; font-weight:600;}
.input { width:100%; padding:8px; border:1px solid var(--border); border-radius:6px; background: var(--surface); color: var(--fg); }
.input:focus { outline:2px solid var(--accent); outline-offset:2px; }
.button { appearance: none; border:1px solid var(--border); background:var(--surface); padding:8px 12px; border-radius:6px; cursor:pointer; color:var(--fg); transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease, transform 0.2s ease; }
.button.primary { background: var(--primary-bg); color: var(--primary-fg); border-color: var(--primary-bg); }
.button:hover { border-color: var(--accent); transform: translateY(-1px); }
.button.primary:hover { background: var(--primary-hover-bg); border-color: var(--primary-hover-bg); }
.button:focus-visible { outline: 2px solid var(--accent); outline-offset:2px; }
.button-row { display:flex; gap:12px; flex-wrap:wrap; align-items:center; }
.sticky-bar { background: transparent; }
.small { font-size: 0.9rem; color: var(--muted); }
.result { font-size: 1.25rem; font-weight: 700; margin-top: 8px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

/* Ad slot: CLS対策のため min-height を先に確保 */
.ad-slot { display:block; width:100%; min-height: 280px; border:1px dashed var(--border); border-radius:12px; background:var(--surface); text-align:center; align-content:center; font-size: 12px; color: var(--muted);}

/* Comments lazy toggle */
#comments { margin-top: 24px; }
#comments button { margin-bottom: 8px; }

/* Breadcrumb */
.breadcrumb { font-size: 0.9rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb span.sep { margin: 0 4px; }

footer { font-size: 0.9rem; color: var(--muted); border-top: 1px solid var(--border); margin-top: 24px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.theme-toggle span { pointer-events: none; font-size: 1rem; }
:root.dark .theme-toggle {
  background: rgba(11, 31, 51, 0.65);
  border-color: var(--border);
  color: var(--fg);
}
:root.dark .theme-toggle:hover {
  color: var(--accent);
}

@media (max-width: 640px) {
  .sticky-bar {
    position: sticky;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px;
    background: var(--bg);
    border-top: 1px solid var(--border);
    box-shadow: 0 -8px 16px rgba(12, 20, 33, 0.12);
    z-index: 20;
  }
  .sticky-bar .button {
    flex: 1 1 auto;
  }
}

.consent-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  background: var(--banner-bg);
  color: var(--banner-text);
  z-index: 900;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.4);
}
.consent-banner.is-active {
  transform: translateY(0);
}
.consent-banner__inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.consent-banner__copy {
  flex: 1 1 320px;
  line-height: 1.5;
}
.consent-banner__links {
  margin: 8px 0 0;
  color: var(--banner-link);
}
.consent-banner__links a {
  color: var(--banner-link);
}
.consent-banner__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.consent-banner__actions button {
  border-radius: 999px;
  padding: 8px 16px;
  border: none;
  font-weight: 600;
  cursor: pointer;
}
.consent-banner__actions button[data-consent-accept] {
  background: #2563eb;
  color: #fff;
}
:root.dark .consent-banner__actions button[data-consent-accept] {
  background: #3b82f6;
}
.consent-banner__actions button[data-consent-reject] {
  background: transparent;
  color: var(--banner-text);
  border: 1px solid rgba(255, 255, 255, 0.4);
}
.consent-banner__actions button:focus-visible {
  outline: 2px solid #bbdefb;
  outline-offset: 2px;
}
.consent-banner__manage {
  margin: 0 auto;
  display: inline-flex;
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  text-decoration: underline;
  padding: 8px 0 0;
}
.consent-banner__manage:focus-visible {
  outline: 2px solid #bbdefb;
  outline-offset: 2px;
}
.consent-banner:not(.is-active) {
  background: transparent;
  box-shadow: none;
}
.consent-banner:not(.is-active) .consent-banner__inner {
  display: none;
}
.consent-banner:not(.is-active) .consent-banner__manage {
  display: none;
}

@media (max-width: 640px) {
  .consent-banner__inner {
    flex-direction: column;
    align-items: stretch;
  }
  .consent-banner__actions {
    justify-content: flex-start;
  }
}

.consent-reopen {
  position: fixed;
  right: 16px;
  bottom: 16px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  box-shadow: var(--shadow);
  z-index: 890;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.consent-reopen:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}
.consent-reopen:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.consent-reopen.is-hidden {
  display: none;
}
:root.dark .consent-reopen {
  background: rgba(11, 31, 51, 0.72);
}