:root {
  color-scheme: light;
  --text: #16181d;
  --muted: #4b5563;
  --line: #e3e7ee;
  --blue: #1d4ed8;
  --blue-dark: #1e3a8a;
  --surface: #f6f8fb;
  --max: 880px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", "Yu Gothic UI", Meiryo, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.7;
  font-size: 16px;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: #fff;
  padding: 8px 12px;
}

.skip:focus { left: 12px; z-index: 3; }

.site-header {
  border-top: 4px solid var(--blue);
  border-bottom: 1px solid var(--line);
}

.header-inner, .wrap, .footer-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.header-inner, .footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 18px;
}

.logo span { color: var(--blue); font-weight: 600; }

.lang-toggle, .btn {
  min-height: 44px;
  border-radius: 8px;
  font: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.lang-toggle {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 0 14px;
  cursor: pointer;
}

.wrap { padding: 40px 0 64px; }

.hero h1, h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.lead { font-size: 18px; margin: 0; }

.section { margin-top: 40px; }

h2 { font-size: 22px; margin: 0 0 16px; }

.tool-card, .panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  background: #fff;
}

.tool-card h3 { margin: 0 0 8px; font-size: 22px; }

.tool-card ul, .plain { margin: 12px 0; padding-left: 1.2em; }

.tool-card li, .plain li { margin: 4px 0; }

.badges { margin: 16px 0; }

.badge {
  display: inline-block;
  border: 1px solid var(--blue);
  color: var(--blue-dark);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 13px;
  margin-right: 8px;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  padding: 0 18px;
  font-weight: 700;
}

.btn-secondary {
  background: #fff;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 0 16px;
  font-weight: 600;
}

a.btn.disabled {
  background: #e5e7eb;
  color: #374151;
  cursor: not-allowed;
  font-weight: 600;
}

.note { color: var(--muted); margin-top: 8px; }

.spec {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 8px 16px;
  margin: 0;
}

.spec dt { color: var(--muted); }
.spec dd { margin: 0; }

.hash {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92rem;
  word-break: break-all;
  background: var(--surface);
  padding: 8px 10px;
}

details { border-top: 1px solid var(--line); padding: 12px 0; }
details:last-child { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; }

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer nav { display: flex; gap: 16px; }

.copy, .site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

.ad-slot:empty { display: none; }

.kicker {
  margin: 0 0 8px;
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.feature-list, .steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list { grid-template-columns: 1fr 1fr; }

.feature-list li, .step {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 0;
  background: #fff;
}

.steps { grid-template-columns: repeat(3, 1fr); }

.step strong {
  display: block;
  color: var(--blue);
  font-size: 13px;
}

.tool-list {
  display: grid;
  gap: 16px;
}

.badge-muted {
  border-color: var(--line);
  color: var(--muted);
}

.shot-slot {
  margin: 20px 0 0;
  border: 1px dashed var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--muted);
  padding: 16px;
}

.shot-slot:empty { display: none; }

.release-link { display: inline-block; margin-top: 12px; }

@media (max-width: 640px) {
  .header-inner, .footer-inner { align-items: flex-start; padding: 12px 0; flex-direction: column; }
  .wrap { padding-top: 28px; }
  .spec { grid-template-columns: 1fr; gap: 2px; }
  .spec dt { margin-top: 12px; }
  .btn-primary, .btn-secondary { width: 100%; }
  .feature-list, .steps { grid-template-columns: 1fr; }
}