:root {
  color-scheme: light dark;
  --bg: #f7f7f2;
  --panel: #ffffff;
  --ink: #182027;
  --muted: #59646f;
  --line: #d6d8cf;
  --accent: #1f7668;
  --accent-2: #c64632;
  --accent-3: #e4b84a;
  --dark: #17212b;
  --shadow: 0 18px 45px rgba(24, 32, 39, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(24, 32, 39, 0.12);
  background: rgba(247, 247, 242, 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

nav a,
.button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  text-decoration: none;
  background: var(--panel);
  color: var(--ink);
  font-weight: 650;
}

nav a {
  min-height: 36px;
  padding: 0.45rem 0.7rem;
  font-size: 0.92rem;
}

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

main {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.intro {
  min-height: 78vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(1rem, 4vw, 3rem);
  align-items: center;
  padding: clamp(2rem, 7vw, 6rem) 0 3rem;
}

.intro-copy {
  max-width: 680px;
}

.kicker {
  margin: 0 0 0.65rem;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.7rem, 7vw, 5.6rem);
  line-height: 0.96;
}

h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3.1rem);
  line-height: 1.05;
}

h3 {
  margin: 0 0 0.65rem;
  font-size: 1.15rem;
}

p {
  line-height: 1.65;
}

.intro-copy > p:not(.kicker) {
  max-width: 640px;
  color: var(--muted);
  font-size: 1.14rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.signal-panel {
  display: grid;
  gap: 0.75rem;
}

.signal-panel > div,
.module-grid article,
.research-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.signal-panel > div {
  padding: 1rem;
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 0.2rem 0.9rem;
  align-items: start;
}

.signal-panel span {
  grid-row: span 2;
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--dark);
  color: #ffffff;
  font-weight: 800;
}

.signal-panel strong {
  font-size: 1.05rem;
}

.signal-panel p {
  margin: 0;
  color: var(--muted);
}

.section {
  padding: clamp(2rem, 6vw, 5rem) 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 1.5rem;
}

.module-grid,
.research-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.module-grid article,
.research-grid article {
  padding: 1.1rem;
}

.module-grid p,
.research-grid p,
.split p {
  color: var(--muted);
}

ul {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--ink);
}

li + li {
  margin-top: 0.4rem;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(280px, 1.05fr);
  gap: 2rem;
  align-items: start;
}

.resource-list {
  display: grid;
  gap: 0.75rem;
}

.resource-list a {
  display: block;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  text-decoration: none;
  font-weight: 750;
}

.resource-list a:nth-child(1) {
  border-left: 6px solid var(--accent);
}

.resource-list a:nth-child(2) {
  border-left: 6px solid var(--accent-2);
}

.resource-list a:nth-child(3) {
  border-left: 6px solid var(--accent-3);
}

footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .intro,
  .split {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .module-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.55rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11171d;
    --panel: #19232c;
    --ink: #edf0ed;
    --muted: #bac2c8;
    --line: #33404b;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
  }

  .site-header {
    background: rgba(17, 23, 29, 0.92);
  }
}