:root {
  color-scheme: light;
  --ink: #111111;
  --muted: #5d626b;
  --paper: #f4f2ef;
  --paper-strong: #ffffff;
  --surface: #ffffff;
  --surface-strong: #eceef1;
  --line: #d7d9de;
  --line-strong: #aeb3bd;
  --charcoal: #17191d;
  --charcoal-2: #24272d;
  --dark-gray: #343842;
  --mid-gray: #727782;
  --off-white: #f8f7f4;
  --accent: #d71920;
  --accent-strong: #a90f16;
  --accent-soft: #ffe2e3;
  --shadow: 0 20px 48px rgba(17, 17, 17, 0.16);
  --shadow-hard: 12px 12px 0 rgba(17, 17, 17, 0.18);
  --radius: 6px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

code {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  padding: 1px 5px;
  font: 0.95em ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(215, 25, 32, 0.34), transparent 31%),
    linear-gradient(155deg, #050505 0%, var(--charcoal) 45%, var(--charcoal-2) 100%);
  color: var(--off-white);
  padding: 24px clamp(20px, 5vw, 64px) 72px;
}

.hero::after {
  position: absolute;
  right: -120px;
  bottom: -180px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(248, 247, 244, 0.08);
  content: "";
  transform: rotate(22deg);
}

.hero-library,
.hero-compact {
  min-height: 620px;
}

.site-nav {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--max);
  margin: 0 auto 78px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--off-white);
  font-size: 1.05rem;
  font-weight: 850;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(248, 247, 244, 0.2);
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.nav-link {
  border: 1px solid transparent;
  color: rgba(248, 247, 244, 0.76);
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
}

.nav-cta {
  border-color: rgba(248, 247, 244, 0.22);
  border-radius: var(--radius);
  padding: 8px 11px;
  color: var(--off-white);
}

.nav-link:hover,
.card-link:hover,
.button:hover {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: end;
  max-width: var(--max);
  margin: 0 auto;
}

.hero-copy {
  max-width: 880px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #ff4a50;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.05;
  letter-spacing: 0;
}

h1 {
  max-width: 900px;
  font-size: clamp(3.4rem, 8vw, 7.25rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
}

.lede {
  max-width: 790px;
  margin: 22px 0 0;
  color: rgba(248, 247, 244, 0.82);
  font-size: clamp(1.1rem, 2.3vw, 1.45rem);
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-weight: 850;
  text-decoration: none;
}

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

.button-secondary {
  border-color: rgba(248, 247, 244, 0.32);
  color: var(--off-white);
}

.hero-panel,
.artifact-card,
.kpi-card,
.callout,
.calculator,
.table-wrap,
.principle-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel {
  border-color: rgba(248, 247, 244, 0.18);
  background: rgba(248, 247, 244, 0.08);
  box-shadow: none;
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.hero-status {
  border-left: 4px solid var(--accent);
}

.status-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 20px;
  border-bottom: 1px solid rgba(248, 247, 244, 0.12);
}

.status-light {
  width: 10px;
  height: 10px;
  background: var(--accent);
}

.metric-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
  border-bottom: 1px solid rgba(248, 247, 244, 0.12);
}

.metric-row:last-child {
  border-bottom: 0;
}

.metric-row span {
  color: rgba(248, 247, 244, 0.68);
}

.metric-row strong {
  text-align: right;
}

main {
  background:
    linear-gradient(180deg, #ffffff 0, var(--paper) 340px),
    var(--paper);
}

.page-shell,
.section-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding-right: clamp(20px, 5vw, 64px);
  padding-left: clamp(20px, 5vw, 64px);
}

.page-shell {
  padding-top: 56px;
  padding-bottom: 80px;
}

.section {
  padding: 72px 0;
}

.page-shell .section {
  margin-bottom: 72px;
  padding: 0;
}

.library-section {
  margin-top: -44px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-lede {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.compact-heading {
  max-width: 620px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
  gap: 36px;
  align-items: start;
}

.copy-stack {
  color: var(--dark-gray);
  font-size: 1.05rem;
}

.copy-stack > *:first-child {
  margin-top: 0;
}

.copy-stack > *:last-child {
  margin-bottom: 0;
}

.card-grid,
.kpi-grid,
.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card-grid-featured {
  grid-template-columns: minmax(0, 1fr);
}

.catalog-controls {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  padding: 16px;
}

.catalog-search-label {
  color: var(--dark-gray);
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.filter-grid label {
  gap: 6px;
}

.filter-grid span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.catalog-status,
.catalog-empty,
.catalog-fallback {
  margin: 14px 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
}

.catalog-fallback {
  border-left: 4px solid var(--accent);
  background: var(--surface-strong);
  padding: 14px 16px;
}

.artifact-card,
.kpi-card,
.callout,
.principle-card {
  padding: 22px;
}

.artifact-card {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  justify-content: space-between;
  border-color: #1c1c1c;
}

.artifact-card-featured {
  min-height: 320px;
  border-top: 6px solid var(--accent);
  background:
    linear-gradient(135deg, rgba(215, 25, 32, 0.08), transparent 30%),
    #fff;
  box-shadow: var(--shadow-hard);
}

.artifact-card p,
.kpi-card p,
.callout p,
.principle-card p {
  color: var(--muted);
}

.artifact-card h3 {
  max-width: 780px;
}

.validation-note {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.card-meta span,
.privacy-badge,
.source-badge,
.topic-badge,
.credibility-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--dark-gray);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.source-badge {
  border-color: #b8c0cb;
  background: #eef2f6;
  color: #29313b;
}

.source-badge-strong {
  border-color: #9aa4b2;
  background: #dde5ed;
}

.topic-badge {
  border-color: var(--line);
  background: var(--off-white);
  color: var(--muted);
  text-transform: none;
}

.tag-badge {
  border-color: #e2c3c5;
  background: #fff1f2;
  color: var(--accent-strong);
}

.credibility-badge {
  border-color: #1c1c1c;
  background: var(--charcoal);
  color: var(--off-white);
}

.provenance-row,
.topic-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.card-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.card-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 28px;
}

.card-link {
  color: var(--accent-strong);
  font-weight: 850;
  text-decoration: none;
}

.model-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.principles-section {
  background: var(--charcoal);
  color: var(--off-white);
}

.principles-section .section-lede,
.principles-section .principle-card p {
  color: rgba(248, 247, 244, 0.7);
}

.principle-grid {
  align-items: stretch;
}

.principle-card {
  border-color: rgba(248, 247, 244, 0.14);
  background: rgba(248, 247, 244, 0.06);
  box-shadow: none;
}

.rule-number {
  display: inline-block;
  margin-bottom: 30px;
  color: #ff4a50;
  font-weight: 900;
}

.kpi-card strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
}

.kpi-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.callout {
  background: var(--surface-strong);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--charcoal);
  color: var(--off-white);
  font-size: 0.78rem;
  text-transform: uppercase;
}

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

.calculator {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.85fr);
  gap: 24px;
  padding: 22px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 11px 12px;
}

select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 10px 12px;
}

input:focus,
select:focus {
  border-color: var(--accent);
  outline: 2px solid var(--accent-soft);
}

.output-grid {
  display: grid;
  gap: 12px;
}

.output-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.output-row:last-child {
  border-bottom: 0;
}

.output-row strong {
  text-align: right;
}

.note-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 820px) {
  .hero {
    padding-bottom: 52px;
  }

  .site-nav {
    align-items: flex-start;
    margin-bottom: 48px;
  }

  .nav-links {
    gap: 8px;
  }

  .hero-grid,
  .split-section,
  .calculator {
    grid-template-columns: 1fr;
  }

  .card-grid,
  .kpi-grid,
  .principle-grid,
  .input-grid,
  .filter-grid {
    grid-template-columns: 1fr;
  }

  .artifact-card {
    min-height: 220px;
  }
}

@media (max-width: 560px) {
  .site-nav {
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  h1 {
    font-size: clamp(3rem, 16vw, 4.5rem);
  }
}

@media print {
  body {
    background: #fff;
    color: #111;
  }

  .hero,
  .principles-section {
    background: #fff;
    color: #111;
    padding: 24px 0;
  }

  .site-nav,
  .hero-actions,
  .button-row {
    display: none;
  }

  .page-shell {
    max-width: none;
    padding: 0;
  }

  .hero-panel,
  .artifact-card,
  .kpi-card,
  .callout,
  .calculator,
  .table-wrap,
  .principle-card {
    box-shadow: none;
    break-inside: avoid;
  }

  .section {
    margin-bottom: 28px;
    padding: 0;
  }
}