:root {
  --bg: #030303;
  --panel: rgba(255, 255, 255, 0.035);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #f2f2f2;
  --muted: rgba(242, 242, 242, 0.68);
  --faint: rgba(242, 242, 242, 0.42);
  --max: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  min-height: 100%;
  background:
    radial-gradient(circle at 20% 0%, rgba(255,255,255,0.055), transparent 28%),
    radial-gradient(circle at 82% 18%, rgba(255,255,255,0.035), transparent 24%),
    linear-gradient(180deg, #050505 0%, #020202 100%);
}

body {
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: transparent;
}

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

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.site-nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.brand {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.34em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 13px;
}

.nav-links a:hover { color: var(--text); }

.app-link {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0 15px;
  color: var(--text);
  background: rgba(255,255,255,0.045);
}

.site-main {
  min-height: calc(100vh - 76px);
  display: grid;
  align-items: center;
  padding: 76px 0;
}

.site-hero { max-width: 760px; }

.eyebrow {
  color: var(--faint);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.site-title {
  font-size: clamp(56px, 12vw, 132px);
  line-height: 0.86;
  letter-spacing: -0.075em;
}

.subheading {
  margin-top: 18px;
  color: var(--muted);
  font-size: clamp(18px, 3vw, 26px);
  line-height: 1.35;
}

.thesis {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--text);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.045em;
  max-width: 680px;
}

.description {
  margin-top: 22px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
  max-width: 620px;
}

.hero-actions,
.placeholder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.primary-action,
.secondary-action,
.placeholder-action {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 18px;
  font-size: 13px;
  font-weight: 750;
}

.primary-action {
  background: var(--text);
  color: var(--bg);
}

.secondary-action,
.placeholder-action {
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--panel);
}

.placeholder-main {
  min-height: calc(100vh - 76px);
  display: grid;
  place-items: center;
  padding: 72px 0;
}

.placeholder-panel {
  width: min(680px, 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  padding: 34px;
}

.placeholder-title {
  font-size: clamp(34px, 7vw, 68px);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.placeholder-copy {
  margin-top: 18px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.placeholder-actions { margin-top: 26px; }

.knowledge-main {
  padding: 72px 0 88px;
}

.knowledge-article {
  max-width: 920px;
}

.knowledge-hero {
  padding: 48px 0 58px;
  border-bottom: 1px solid var(--line);
}

.knowledge-title {
  font-size: clamp(48px, 9vw, 104px);
  line-height: 0.9;
  letter-spacing: -0.075em;
}

.knowledge-definition {
  margin-top: 28px;
  color: var(--text);
  font-size: clamp(20px, 3vw, 29px);
  line-height: 1.42;
  letter-spacing: -0.028em;
  max-width: 820px;
}

.knowledge-thesis {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--text);
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.045em;
}

.knowledge-section {
  padding: 44px 0;
  border-bottom: 1px solid rgba(255,255,255,0.075);
}

.knowledge-section h2 {
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.05;
  letter-spacing: -0.055em;
  margin-bottom: 18px;
}

.knowledge-section h3 {
  font-size: 18px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.knowledge-section p,
.knowledge-section li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.knowledge-section p + p {
  margin-top: 16px;
}

.knowledge-grid,
.compare-grid,
.framework-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

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

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

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

.knowledge-grid section,
.compare-grid section,
.framework-list section {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  padding: 20px;
}

.compare-grid ul,
.principle-list,
.fact-list {
  display: grid;
  gap: 9px;
  list-style-position: inside;
}

.sequence {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.sequence span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 11px 14px;
}

.framework-flow {
  display: grid;
  justify-items: center;
  gap: 10px;
  margin: 24px 0;
}

.framework-flow div {
  width: min(420px, 100%);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  color: var(--text);
  font-size: 18px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
  padding: 18px;
}

.framework-flow span {
  color: var(--faint);
  font-size: 24px;
  line-height: 1;
}

.evolution-list {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  list-style: none;
}

.evolution-list li {
  display: grid;
  grid-template-columns: minmax(150px, 0.36fr) 1fr;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  padding: 18px;
}

.evolution-list strong {
  color: var(--text);
}

.summary-definition {
  color: var(--text) !important;
  font-size: clamp(20px, 3vw, 28px) !important;
  line-height: 1.46 !important;
  letter-spacing: -0.026em;
}

.related-links {
  padding-top: 44px;
}

.related-links h2 {
  color: var(--faint);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.related-links a {
  display: block;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}

.related-links a:hover {
  color: var(--text);
}

@media (max-width: 760px) {
  .container { width: min(100% - 28px, var(--max)); }
  .site-nav { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .nav-links { width: 100%; flex-wrap: wrap; gap: 12px; }
  .app-link { min-height: 34px; }
  .site-main { min-height: auto; padding: 56px 0 72px; }
  .placeholder-panel { padding: 26px; }
  .knowledge-main { padding: 42px 0 68px; }
  .knowledge-hero { padding-top: 22px; }
  .knowledge-grid,
  .compare-grid,
  .evolution-list li { grid-template-columns: 1fr; }
}