:root {
  color-scheme: light;
  --ink: #1d2528;
  --muted: #5b686d;
  --line: #d8dfdc;
  --paper: #fbfcfa;
  --band: #eef4ef;
  --accent: #0f766e;
  --accent-dark: #0b4f4a;
  --warm: #b45309;
  --soft: #ffffff;
  --shadow: 0 12px 30px rgba(31, 41, 35, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 56px);
  background: rgba(251, 252, 250, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 8px;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 18px;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

nav a, .button, .tab {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  background: var(--soft);
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.button.primary, .tab.active {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

main {
  display: grid;
  gap: 34px;
  padding: 28px clamp(20px, 5vw, 56px) 42px;
}

.overview {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 28px;
  align-items: stretch;
}

.summary {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff 0%, #f6faf7 100%);
  box-shadow: var(--shadow);
}

.summary p, .section-heading p, .muted {
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  min-height: 112px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--soft);
}

.metric span {
  display: block;
  color: var(--accent-dark);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
}

.metric small {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.band, .split {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  box-shadow: var(--shadow);
}

.band {
  padding: 24px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
  gap: 24px;
  padding: 24px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.search {
  display: grid;
  gap: 5px;
  min-width: min(100%, 320px);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input {
  min-height: 42px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  font: inherit;
}

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

.tab {
  cursor: pointer;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fcfdfb;
}

.card p:last-child, .card ul:last-child {
  margin-bottom: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.tag {
  border: 1px solid #cfe0d9;
  border-radius: 999px;
  padding: 2px 8px;
  color: var(--accent-dark);
  background: #edf7f3;
  font-size: 12px;
  font-weight: 700;
}

.resource-list, .mining-list, .book-list {
  display: grid;
  gap: 10px;
}

.resource-link, .mining-row, .book-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fcfdfb;
  text-decoration: none;
}

.resource-link span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.sequence {
  margin: 0;
  padding-left: 22px;
}

.sequence li + li {
  margin-top: 10px;
}

.mining-row div {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.mining-row b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  min-height: 28px;
  border-radius: 8px;
  background: #fef3c7;
  color: var(--warm);
  font-size: 13px;
}

.mining-row a {
  color: var(--accent-dark);
  font-weight: 800;
}

.book-card div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.book-card b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  min-height: 28px;
  border-radius: 8px;
  background: #e0f2fe;
  color: #075985;
  font-size: 13px;
}

.book-card a {
  color: var(--accent-dark);
  font-weight: 800;
}

.book-group {
  display: grid;
  gap: 10px;
  padding-top: 6px;
}

.book-group + .book-group {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.book-group-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.book-group-heading h3 {
  margin: 0;
}

.source-list {
  columns: 2;
  gap: 30px;
  margin: 0;
  padding-left: 20px;
}

.source-list li {
  break-inside: avoid;
  margin-bottom: 8px;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 22px clamp(20px, 5vw, 56px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 820px) {
  .topbar, .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .overview, .split {
    grid-template-columns: 1fr;
  }

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

  .source-list {
    columns: 1;
  }
}

@media (max-width: 520px) {
  .metrics {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}