:root {
  color-scheme: light;
  --bg: #f4f5f3;
  --paper: #fffefa;
  --ink: #101820;
  --muted: #59646f;
  --line: #cfd5db;
  --strong: #0b2f4f;
  --link: #0758a6;
  --green: #1f6b45;
  --amber: #8a5b00;
  --red: #9b1c1f;
  --blue-soft: #e7f0f8;
  --green-soft: #e8f2ec;
  --amber-soft: #f7efd9;
  --red-soft: #f6e6e7;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: var(--bg);
}

img {
  max-width: 100%;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

a:hover,
a:focus-visible {
  color: var(--red);
}

.site-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  border-bottom: 3px solid var(--ink);
  background: var(--paper);
}

.masthead {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: center;
  padding: 22px 0 16px;
}

.brand-mark {
  width: 64px;
  height: 64px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: #ffffff;
}

.brand-title {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.45rem;
  line-height: 1;
  letter-spacing: 0;
}

.brand-title a {
  color: inherit;
  text-decoration: none;
}

.tagline {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.utility-bar,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 0.94rem;
}

.utility-bar a,
.footer-links a {
  color: var(--strong);
  font-weight: 700;
}

.date-line {
  margin-left: auto;
  color: var(--muted);
  font-weight: 600;
}

main {
  padding: 22px 0 44px;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 0.92fr);
  gap: 20px;
  align-items: start;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.32rem;
  letter-spacing: 0;
}

.section-title small {
  color: var(--muted);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
}

.lead-card,
.panel,
.link-item,
.resource-card,
.standard-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.lead-card {
  padding: 18px;
}

.lead-card h2 {
  margin: 0 0 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.7rem;
  line-height: 1.12;
}

.lead-card p,
.panel p,
.resource-card p,
.standard-box p,
.content-page p {
  color: var(--muted);
}

.desk-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.news-section,
.panel {
  padding: 14px;
}

.news-section {
  border-top: 3px solid var(--strong);
  background: var(--paper);
}

.news-section.energy {
  border-top-color: var(--green);
}

.news-section.stewardship {
  border-top-color: var(--amber);
}

.news-section.risk {
  border-top-color: var(--red);
}

.news-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list li {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.news-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.kicker,
.tag {
  display: inline-block;
  margin: 0 0 5px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--strong);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.tag.green {
  background: var(--green-soft);
  color: var(--green);
}

.tag.amber {
  background: var(--amber-soft);
  color: var(--amber);
}

.tag.red {
  background: var(--red-soft);
  color: var(--red);
}

.item-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.3;
}

.item-title a {
  color: var(--ink);
  font-weight: 800;
}

.item-meta,
.note {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.resource-path {
  margin: 8px 0 0;
  padding: 7px 9px;
  border-left: 3px solid var(--green);
  background: var(--green-soft);
  color: var(--ink);
  font-size: 0.88rem;
}

.resource-path strong {
  color: var(--green);
}

.sidebar-stack,
.resource-grid,
.topic-grid {
  display: grid;
  gap: 14px;
}

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

.panel h2,
.panel h3,
.resource-card h2,
.resource-card h3,
.standard-box h2,
.content-page h2 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.panel ul,
.content-page ul {
  margin: 10px 0 0;
  padding-left: 1.1rem;
}

.panel li,
.content-page li {
  margin: 0 0 7px;
}

.resource-card,
.standard-box {
  padding: 15px;
}

.content-page {
  max-width: 900px;
  padding: 24px 0 50px;
}

.library-page {
  padding: 28px 0 56px;
}

.library-intro {
  max-width: 920px;
}

.library-intro h1 {
  max-width: 820px;
  margin: 4px 0 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 3.45rem);
  line-height: 1.02;
}

.library-intro > p:not(.kicker) {
  max-width: 820px;
  color: var(--muted);
  font-size: 1.08rem;
}

.level-key,
.library-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.level-key {
  margin: 20px 0 0;
}

.level-key span,
.library-jump a {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  font-size: 0.86rem;
}

.level-key b {
  color: var(--strong);
}

.library-jump {
  position: sticky;
  z-index: 2;
  top: 0;
  margin: 26px 0 30px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(8px);
}

.library-jump a {
  color: var(--strong);
  font-weight: 750;
  text-decoration: none;
}

.library-section-title {
  margin: 38px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
}

.featured-resources {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.atlas-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.atlas-card {
  padding: 17px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--strong);
  border-radius: 8px;
  background: var(--paper);
}

.atlas-card h3 {
  margin: 0 0 6px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.16rem;
}

.atlas-card > p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.93rem;
}

.resource-links {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.resource-links li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  margin: 0;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 0.94rem;
}

.level {
  font-size: 0.69rem;
  font-weight: 850;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.level.start { color: var(--green); }
.level.learn { color: var(--link); }
.level.practice { color: var(--amber); }
.level.frontier { color: var(--red); }

.library-note {
  margin-top: 40px;
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: var(--paper);
}

.library-note h2,
.library-note p {
  margin-top: 0;
}

.library-note p:last-child {
  margin-bottom: 0;
}

.review-date {
  color: var(--muted);
  font-size: 0.86rem;
}

.content-page h1 {
  margin: 0 0 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: 0;
}

.content-page h2 {
  margin-top: 28px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
}

.source-list {
  padding-left: 1.1rem;
}

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

.site-footer {
  border-top: 3px solid var(--ink);
  background: var(--paper);
}

.book-hero { display: grid; grid-template-columns: minmax(220px, 360px) 1fr; gap: 42px; align-items: center; margin: 28px 0 48px; }
.book-cover { width: 100%; height: auto; box-shadow: 0 18px 42px rgba(18, 46, 58, .18); border-radius: 6px; }
.book-deck { font-size: 1.35rem; line-height: 1.45; color: #405d69; }
.book-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 14px; }
.book-button { display: inline-block; padding: 12px 18px; border-radius: 5px; background: #205f70; color: #fff !important; font-weight: 700; text-decoration: none; }
.book-button:hover { background: #174858; }
.book-button.secondary { background: #fff; color: #205f70 !important; border: 2px solid #205f70; padding: 10px 16px; }
.book-notice { margin: 38px 0; padding: 18px 22px; border-left: 6px solid #c55432; background: #fff6f1; }
@media (max-width: 760px) { .book-hero { grid-template-columns: 1fr; } .book-cover { max-width: 320px; margin: auto; } }

.footer-inner {
  padding: 18px 0 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 10;
  padding: 8px 10px;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus {
  left: 8px;
}

@media (max-width: 760px) {
  .site-shell {
    width: min(100% - 22px, 1180px);
  }

  .masthead,
  .page-grid,
  .desk-columns,
  .resource-grid,
  .atlas-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .library-jump {
    position: static;
  }

  .brand-title {
    font-size: 1.95rem;
  }

  .date-line {
    margin-left: 0;
    width: 100%;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .site-header,
  .site-footer {
    border-color: #000;
  }
}