:root {
  --fl-accent: rgb(255 68 0);
  --fl-accent-on-light: rgb(214 58 0);
  --fl-accent-tint: rgb(251 239 233);
  --fl-ink: rgb(10 10 10);
  --fl-white: rgb(255 255 255);
  --fl-grey-1: rgb(51 51 54);
  --fl-grey-2: rgb(111 111 117);
  --fl-grey-3: rgb(192 192 192);
  --fl-grey-4: rgb(230 230 230);
  --fl-grey-5: rgb(246 246 246);
  --fl-divider-dark: rgb(38 38 44);
  --fl-font-jp: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --fl-font-display: "Inter Display", "Inter", sans-serif;
  --content-width: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  background: var(--fl-grey-5);
  color: var(--fl-grey-1);
  font-family: var(--fl-font-jp);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
button { border-radius: 0; }
button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--fl-ink);
  outline-offset: 3px;
}
[hidden] { display: none !important; }
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--fl-white);
  color: var(--fl-ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--fl-divider-dark);
  background: var(--fl-ink);
  color: var(--fl-white);
}
.header-inner {
  display: flex;
  width: min(100%, var(--content-width));
  min-height: 72px;
  margin: 0 auto;
  padding: 14px 24px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand-group, .badge-group, .toolbar, .button-row, .status-row {
  display: flex;
  align-items: center;
}
.brand-group { min-width: 0; gap: 16px; }
.wordmark {
  color: var(--fl-white);
  font-family: var(--fl-font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.04em;
  white-space: nowrap;
}
.header-label {
  overflow: hidden;
  padding-left: 16px;
  border-left: 1px solid var(--fl-grey-2);
  color: var(--fl-grey-3);
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.badge-group { flex-shrink: 0; gap: 8px; }
.badge {
  display: inline-flex;
  min-height: 32px;
  padding: 5px 10px;
  align-items: center;
  border: 1px solid var(--fl-grey-2);
  color: var(--fl-white);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
}
.badge-proposal {
  border-color: var(--fl-accent);
  background: var(--fl-accent);
  color: var(--fl-ink);
}
.page {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 56px 24px 88px;
}
.hero {
  display: grid;
  margin-bottom: 40px;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  gap: 56px;
  align-items: end;
}
.eyebrow {
  margin: 0 0 10px;
  color: var(--fl-accent-on-light);
  font-family: var(--fl-font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
h1, h2, h3, h4, p { margin-top: 0; }
h1, h2, h3, h4 { color: var(--fl-ink); line-height: 1.4; }
h1 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 800;
  letter-spacing: -0.04em;
}
h2 {
  margin-bottom: 12px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: -0.025em;
}
h3 { margin-bottom: 10px; font-size: 18px; font-weight: 800; }
h4 { margin-bottom: 8px; font-size: 15px; font-weight: 800; }
.hero-copy, .section-copy, .card-copy, .small-copy { color: var(--fl-grey-2); }
.hero-copy { max-width: 760px; margin-bottom: 0; font-size: 17px; }
.boundary-note {
  margin: 0;
  padding: 18px 20px;
  border-left: 4px solid var(--fl-accent);
  background: var(--fl-white);
  color: var(--fl-grey-1);
  font-size: 14px;
}
.section-block { margin-top: 32px; }
.section-heading-row {
  display: flex;
  margin-bottom: 20px;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}
.section-copy { max-width: 720px; margin-bottom: 0; }
.tab-list {
  display: grid;
  border: 1px solid var(--fl-grey-3);
  background: var(--fl-white);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.tab-button {
  min-height: 58px;
  padding: 12px 18px;
  border: 0;
  border-right: 1px solid var(--fl-grey-3);
  background: var(--fl-white);
  color: var(--fl-grey-1);
  cursor: pointer;
  font-weight: 700;
}
.tab-button:last-child { border-right: 0; }
.tab-button:hover { background: var(--fl-grey-5); }
.tab-button[aria-selected="true"] { background: var(--fl-ink); color: var(--fl-white); }
.workspace { padding-top: 36px; }
.workspace-head {
  display: grid;
  margin-bottom: 28px;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: start;
}
.toolbar { gap: 12px; }
.reset-button, .secondary-button, .primary-button {
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid var(--fl-ink);
  cursor: pointer;
  font-weight: 800;
}
.reset-button, .secondary-button { background: var(--fl-white); color: var(--fl-ink); }
.reset-button:hover, .secondary-button:hover { background: var(--fl-grey-5); }
.primary-button {
  border-color: var(--fl-accent-on-light);
  background: var(--fl-accent-on-light);
  color: var(--fl-white);
}
.primary-button:hover { background: var(--fl-ink); border-color: var(--fl-ink); }
button:disabled {
  border-color: var(--fl-grey-3);
  background: var(--fl-grey-4);
  color: var(--fl-grey-2);
  cursor: not-allowed;
}
.scenario-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1.28fr);
  gap: 24px;
}
.scenario-nav, .work-area { min-width: 0; }
.scenario-list { display: grid; gap: 10px; }
.scenario-button {
  width: 100%;
  min-height: 120px;
  padding: 18px;
  border: 1px solid var(--fl-grey-3);
  background: var(--fl-white);
  color: var(--fl-grey-1);
  text-align: left;
  cursor: pointer;
}
.scenario-button:hover { border-color: var(--fl-ink); }
.scenario-button[aria-checked="true"] {
  border: 2px solid var(--fl-accent-on-light);
  background: var(--fl-accent-tint);
}
.scenario-name {
  display: block;
  margin-bottom: 6px;
  color: var(--fl-ink);
  font-weight: 800;
}
.scenario-summary {
  display: block;
  color: var(--fl-grey-2);
  font-size: 13px;
  line-height: 1.65;
}
.stage-list {
  display: grid;
  margin: 0 0 16px;
  padding: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  list-style: none;
}
.stage-item {
  padding: 10px 12px;
  border-top: 4px solid var(--fl-grey-3);
  color: var(--fl-grey-2);
  font-size: 12px;
  font-weight: 700;
}
.stage-item.is-current { border-top-color: var(--fl-accent-on-light); color: var(--fl-ink); }
.stage-item.is-complete { border-top-color: var(--fl-ink); color: var(--fl-ink); }
.card {
  margin-bottom: 16px;
  padding: 26px;
  border: 1px solid var(--fl-grey-3);
  background: var(--fl-white);
}
.card-copy, .small-copy { margin-bottom: 16px; }
.small-copy { font-size: 13px; }
.input-memo {
  margin: 0;
  padding: 18px;
  border-left: 3px solid var(--fl-grey-3);
  background: var(--fl-grey-5);
  color: var(--fl-grey-1);
  font-family: var(--fl-font-jp);
  font-size: 14px;
  line-height: 1.8;
  white-space: pre-wrap;
}
.button-row { margin-top: 20px; flex-wrap: wrap; gap: 12px; }
.output-sections { display: grid; gap: 20px; }
.output-section { padding-top: 18px; border-top: 1px solid var(--fl-grey-4); }
.output-section:first-child { padding-top: 0; border-top: 0; }
.output-section ul, .review-list { margin: 0; padding-left: 1.4em; }
.output-section li + li, .review-list li + li { margin-top: 6px; }
.review-checks {
  display: grid;
  margin: 18px 0 0;
  padding: 18px;
  border: 1px solid var(--fl-grey-4);
  gap: 12px;
}
.review-check {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  cursor: pointer;
}
.review-check input {
  width: 18px;
  height: 18px;
  margin: 4px 0 0;
  accent-color: var(--fl-accent-on-light);
}
.status-panel {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--fl-ink);
  background: var(--fl-grey-5);
}
.status-row { gap: 10px; }
.status-mark {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  background: var(--fl-ink);
  color: var(--fl-white);
  font-weight: 800;
}
.status-title { color: var(--fl-ink); font-weight: 800; }
.status-copy { margin: 8px 0 0 38px; color: var(--fl-grey-2); font-size: 13px; }
.guardrail-section {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--fl-grey-3);
}
.guardrail-grid {
  display: grid;
  margin-top: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.guardrail-card {
  min-height: 170px;
  padding: 20px;
  border: 1px solid var(--fl-grey-3);
  background: var(--fl-white);
}
.guardrail-number {
  display: block;
  margin-bottom: 26px;
  color: var(--fl-accent-on-light);
  font-family: var(--fl-font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.guardrail-card p { margin-bottom: 0; color: var(--fl-grey-2); font-size: 13px; }
.footer-note { margin: 40px 0 0; color: var(--fl-grey-2); font-size: 12px; text-align: center; }
#selftest-output { white-space: pre-wrap; }

@media (max-width: 860px) {
  .hero, .scenario-layout { grid-template-columns: 1fr; gap: 28px; }
  .guardrail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .workspace-head { grid-template-columns: 1fr; }
  .toolbar { justify-content: flex-start; }
}
@media (max-width: 620px) {
  .header-inner { min-height: 64px; padding: 10px 14px; gap: 10px; }
  .header-label { display: none; }
  .wordmark { font-size: 18px; }
  .badge { min-height: 28px; padding: 3px 7px; font-size: 10px; }
  .page { padding: 36px 16px 64px; }
  .tab-list, .stage-list, .guardrail-grid { grid-template-columns: 1fr; }
  .tab-button { border-right: 0; border-bottom: 1px solid var(--fl-grey-3); }
  .tab-button:last-child { border-bottom: 0; }
  .card { padding: 20px; }
  .status-copy { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}