:root {
  --ink: #0f172a;
  --muted: #526079;
  --subtle: #718096;
  --line: #d7e0ea;
  --surface: #ffffff;
  --page: #f6f9fc;
  --blue: #2563eb;
  --blue-soft: #eaf2ff;
  --teal: #0f9f8f;
  --teal-soft: #e8f8f5;
  --amber: #c47a09;
  --amber-soft: #fff7df;
  --green: #16834b;
  --green-soft: #eaf8ef;
  --red: #b84040;
  --red-soft: #fff0f0;
  --shadow: 0 20px 50px rgba(27, 45, 77, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  line-height: 1.65;
}

button,
select,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-nav {
  position: fixed;
  z-index: 30;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(215, 224, 234, 0.82);
  background: rgba(246, 249, 252, 0.92);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex: 0 0 auto;
  font-size: 1.05rem;
  font-weight: 800;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.18);
}

.nav-actions,
.nav-links,
.lang-switch {
  display: flex;
  align-items: center;
}

.nav-actions {
  gap: 0.8rem;
  min-width: 0;
}

.nav-links {
  gap: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.nav-links a {
  padding: 0.5rem 0.68rem;
  border-radius: 6px;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(37, 99, 235, 0.09);
}

.lang-switch {
  gap: 0.2rem;
  padding: 0.2rem;
  flex: 0 0 auto;
  border: 1px solid rgba(151, 164, 184, 0.52);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
}

.lang-option {
  min-height: 1.85rem;
  padding: 0.25rem 0.55rem;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.lang-option.is-active {
  color: #fff;
  background: var(--ink);
}

.page-main {
  padding-top: 5rem;
}

.page-hero,
.page-section,
.page-footer {
  padding-right: clamp(1rem, 6vw, 5rem);
  padding-left: clamp(1rem, 6vw, 5rem);
}

.page-hero {
  padding-top: clamp(4rem, 8vw, 7rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.page-hero-inner,
.section-inner,
.footer-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.eyebrow,
.section-kicker {
  margin: 0 0 0.8rem;
  color: var(--teal);
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 18ch;
  margin-bottom: 1rem;
  font-size: clamp(2.5rem, 7vw, 5.3rem);
  line-height: 1.02;
}

h2 {
  margin-bottom: 0.75rem;
  font-size: clamp(1.65rem, 3.6vw, 2.8rem);
  line-height: 1.15;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.12rem;
  line-height: 1.35;
}

.hero-lede,
.section-lede {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
}

.page-section {
  padding-top: clamp(3.2rem, 7vw, 6rem);
  padding-bottom: clamp(3.2rem, 7vw, 6rem);
  border-bottom: 1px solid var(--line);
}

.page-section.is-white {
  background: #fff;
}

.page-section.is-compact {
  padding-top: 2.6rem;
  padding-bottom: 2.6rem;
}

.section-head {
  margin-bottom: 2rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.button {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-weight: 750;
  cursor: pointer;
}

.button-primary {
  border-color: var(--ink);
  color: #fff;
  background: var(--ink);
}

.button-secondary {
  background: #fff;
}

.tab-list {
  display: flex;
  width: max-content;
  max-width: 100%;
  gap: 0.25rem;
  margin: 0 0 2rem;
  padding: 0.3rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.tab-button {
  min-height: 2.6rem;
  padding: 0.55rem 0.95rem;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  white-space: nowrap;
  cursor: pointer;
}

.tab-button[aria-selected="true"] {
  color: #fff;
  background: var(--ink);
}

.scenario-grid,
.guide-grid,
.principle-grid,
.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.scenario-card,
.guide-card,
.metric-card {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.scenario-meta,
.metric-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.9rem;
}

.scenario-card p,
.guide-card p,
.metric-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.scenario-output {
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 1.8rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: var(--green);
  background: var(--green-soft);
  font-size: 0.78rem;
  font-weight: 800;
  white-space: nowrap;
}

.status-pill.is-planned {
  color: var(--amber);
  background: var(--amber-soft);
}

.principle-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
}

.principle {
  padding: 1.1rem 1.1rem 1.1rem 1.25rem;
  border-left: 3px solid var(--blue);
  background: rgba(255, 255, 255, 0.72);
}

.principle:nth-child(2) {
  border-color: var(--teal);
}

.principle:nth-child(3) {
  border-color: var(--amber);
}

.principle p {
  margin-bottom: 0;
  color: var(--muted);
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.flow-step {
  min-width: 0;
  padding: 1.2rem;
  background: #fff;
}

.step-number {
  width: 2rem;
  height: 2rem;
  display: inline-grid;
  place-items: center;
  margin-bottom: 0.9rem;
  border-radius: 50%;
  color: var(--blue);
  background: var(--blue-soft);
  font-weight: 800;
}

.flow-step p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.privacy-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.privacy-table th,
.privacy-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.privacy-table th {
  width: 30%;
  color: var(--ink);
  background: #f8fafc;
}

.privacy-table tr:last-child th,
.privacy-table tr:last-child td {
  border-bottom: 0;
}

.stats-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.stats-toolbar select {
  width: 100%;
  min-height: 2.8rem;
  padding: 0.55rem 2.4rem 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: #fff;
}

.stats-state {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.progress-track {
  height: 0.55rem;
  margin: 0.9rem 0 0.5rem;
  overflow: hidden;
  border-radius: 999px;
  background: #e5ebf2;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 220ms ease;
}

.metric-grid {
  margin-top: 1rem;
}

.metric-value {
  color: var(--blue);
  font-size: 2rem;
  font-weight: 850;
  line-height: 1;
}

.stats-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.stats-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.stats-table th,
.stats-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.stats-table th {
  color: var(--subtle);
  background: #f8fafc;
  font-size: 0.82rem;
}

.stats-table tr:last-child td {
  border-bottom: 0;
}

.notice {
  margin-top: 1.5rem;
  padding: 1rem 1.15rem;
  border: 1px solid #bdd6ff;
  border-radius: 8px;
  color: #244a84;
  background: var(--blue-soft);
}

.notice strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink);
}

.code-block {
  margin: 1rem 0 0;
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid #26334b;
  border-radius: 8px;
  color: #eef5ff;
  background: #111a2d;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
}

.guide-grid {
  margin-top: 1.5rem;
}

.guide-card .step-number {
  margin-bottom: 0.7rem;
}

.page-footer {
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  color: var(--muted);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.88rem;
}

[hidden] {
  display: none !important;
}

@media (max-width: 860px) {
  .site-nav {
    position: static;
    flex-wrap: wrap;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .nav-links {
    min-width: 0;
    overflow-x: auto;
  }

  .page-main {
    padding-top: 0;
  }

  .flow-grid,
  .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .site-nav {
    padding: 0.85rem 1rem;
  }

  .nav-actions {
    gap: 0.5rem;
  }

  .nav-links a {
    padding: 0.45rem 0.55rem;
    font-size: 0.84rem;
  }

  .lang-option {
    padding-right: 0.45rem;
    padding-left: 0.45rem;
  }

  .scenario-grid,
  .guide-grid,
  .metric-grid,
  .principle-grid,
  .flow-grid {
    grid-template-columns: 1fr;
  }

  .stats-toolbar {
    grid-template-columns: 1fr;
  }

  .privacy-table,
  .privacy-table tbody,
  .privacy-table tr,
  .privacy-table th,
  .privacy-table td {
    display: block;
    width: 100%;
  }

  .privacy-table tr {
    border-bottom: 1px solid var(--line);
  }

  .privacy-table tr:last-child {
    border-bottom: 0;
  }

  .privacy-table th,
  .privacy-table td {
    border-bottom: 0;
  }

  .privacy-table th {
    padding-bottom: 0.25rem;
  }

  .privacy-table td {
    padding-top: 0.25rem;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}