:root {
  --bg: #f5f7fb;
  --panel: rgba(255, 255, 255, 0.84);
  --panel-strong: #ffffff;
  --line: #dbe3ef;
  --line-strong: #c8d2e3;
  --text: #0f172a;
  --muted: #52617a;
  --soft: #7b879b;
  --accent: #0f766e;
  --accent-2: #2563eb;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --good: #0f9d58;
  --warn: #d97706;
  --info: #2563eb;
  --danger: #b42318;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.05);
  --sidebar-width: 286px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.09), transparent 22%),
    linear-gradient(180deg, #f8fbff 0%, #f4f7fb 42%, #eef3f9 100%);
}

.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.55) 0%, transparent 46%),
    linear-gradient(320deg, rgba(15,118,110,0.04) 0%, transparent 35%);
  z-index: 0;
}

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100svh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100svh;
  padding: 24px 18px;
  border-right: 1px solid rgba(200, 210, 227, 0.72);
  background: rgba(246, 248, 252, 0.76);
  backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.brand-mark {
  width: 54px;
  height: 54px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  color: white;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, var(--accent-2), #0f766e);
  box-shadow: var(--shadow-soft);
  flex: 0 0 auto;
}

.brand h1,
.hero h2,
.chapter h3,
.section-card h4 {
  margin: 0;
  letter-spacing: -0.03em;
}

.brand h1 {
  font-size: 1.08rem;
  line-height: 1.35;
}

.brand-sub,
.hero-lead,
.lead,
.mini-callout p,
.chapter p {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sidebar-nav {
  display: grid;
  gap: 8px;
}

.nav-link {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border-radius: 14px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid transparent;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease, color 150ms ease;
}

.nav-link:hover,
.nav-link.active {
  background: var(--panel-strong);
  border-color: var(--line);
  transform: translateX(2px);
  color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.nav-link span {
  color: var(--soft);
  font-size: 0.85rem;
}

.sidebar-footer {
  margin-top: auto;
  display: grid;
  gap: 12px;
}

.mini-callout {
  padding: 14px;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.mini-callout strong {
  display: block;
  margin-bottom: 6px;
}

.mini-callout p {
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.92rem;
}

.main {
  min-width: 0;
  padding: 18px 18px 28px;
}

.topbar {
  position: sticky;
  top: 14px;
  z-index: 3;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px;
  border: 1px solid rgba(200, 210, 227, 0.72);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-soft);
}

.search-wrap {
  flex: 1 1 320px;
  min-width: 240px;
}

#search {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
  color: var(--text);
  font: inherit;
  outline: none;
}

#search:focus {
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.chip-row,
.tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip,
.button,
.tag,
.count-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--panel-strong);
  color: var(--text);
  text-decoration: none;
  font: inherit;
}

.chip {
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.chip:hover,
.button:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.chip.active,
.tag.highlight {
  background: var(--accent-soft);
  border-color: rgba(15, 118, 110, 0.22);
  color: var(--accent);
}

.button.primary {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: white;
  border-color: transparent;
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.18);
}

.hero,
.chapter,
.library-panel {
  margin-top: 18px;
  padding: 24px;
  border-radius: var(--radius-xl);
  background: var(--panel);
  border: 1px solid rgba(219, 227, 239, 0.78);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.95fr);
  gap: 18px;
  align-items: start;
}

.hero h2 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.02;
  margin-bottom: 14px;
}

.hero-lead {
  font-size: 1.02rem;
  max-width: 60ch;
}

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

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-quote {
  padding: 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.07), rgba(37, 99, 235, 0.05));
  border: 1px solid rgba(15, 118, 110, 0.12);
}

.hero-quote p {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-quote strong {
  display: block;
  line-height: 1.7;
  font-size: 1rem;
}

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

.metric-card {
  padding: 16px;
  border-radius: 20px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.metric-card strong {
  display: block;
  font-size: 1.6rem;
  margin-bottom: 4px;
}

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

.chapter-head,
.section-card-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.chapter-head h3 {
  font-size: clamp(1.4rem, 2vw, 2rem);
  margin-bottom: 8px;
}

.chapter-tools {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tier-grid,
.card-grid,
.compare-grid,
.library-grid {
  display: grid;
  gap: 14px;
}

.tier-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 14px;
}

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

.pillar-card,
.section-card,
.detail-card,
.compare-card,
.source-card,
.metric-card,
.space-card,
.digital-card,
.ship-card,
.library-card {
  overflow: hidden;
}

.pillar-card,
.source-card {
  padding: 18px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.pillar-card h4,
.source-card h4 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.pillar-list,
.source-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.policy-item,
.source-item,
.mini-item {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(245, 247, 251, 0.92);
  border: 1px solid var(--line);
}

.policy-item h5,
.source-item h5,
.mini-item h5 {
  margin: 0;
  font-size: 1rem;
}

.policy-item p,
.source-item p,
.mini-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.meta-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag,
.count-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--muted);
}

.tag.current {
  background: rgba(15, 157, 88, 0.1);
  border-color: rgba(15, 157, 88, 0.22);
  color: var(--good);
}

.tag.historical {
  background: rgba(100, 116, 139, 0.1);
  border-color: rgba(100, 116, 139, 0.22);
  color: #475569;
}

.tag.trial {
  background: rgba(217, 119, 6, 0.1);
  border-color: rgba(217, 119, 6, 0.22);
  color: var(--warn);
}

.tag.pending {
  background: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.22);
  color: var(--info);
}

.tag.official {
  background: rgba(15, 118, 110, 0.1);
  border-color: rgba(15, 118, 110, 0.18);
  color: var(--accent);
}

.tag.research {
  background: rgba(124, 58, 237, 0.1);
  border-color: rgba(124, 58, 237, 0.2);
  color: #6d28d9;
}

.tag.muted {
  background: rgba(148, 163, 184, 0.12);
  border-color: rgba(148, 163, 184, 0.24);
  color: #64748b;
}

.section-card {
  margin-top: 14px;
  padding: 18px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

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

.detail-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.detail-card header {
  display: grid;
  gap: 8px;
}

.detail-card h4,
.detail-card h5 {
  margin: 0;
}

.detail-card .btn-row,
.source-card .btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.detail-card .button,
.source-card .button {
  padding: 9px 12px;
  font-size: 0.9rem;
}

.detail-card .button.secondary,
.source-card .button.secondary {
  background: transparent;
}

.scroll-table {
  width: 100%;
  min-width: 860px;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
}

.scroll-table th,
.scroll-table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

.scroll-table th {
  position: sticky;
  top: 0;
  background: rgba(248, 250, 252, 0.98);
  z-index: 1;
  font-size: 0.88rem;
  color: var(--muted);
}

.scroll-table tr:hover td {
  background: rgba(15, 118, 110, 0.025);
}

.scroll-table td.active-cell {
  background: rgba(15, 118, 110, 0.05);
}

.scroll-table .cell-muted {
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: white;
  box-shadow: var(--shadow-soft);
}

.flow-panel {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.flow-step {
  position: relative;
  padding: 14px 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.08), rgba(15, 118, 110, 0.06));
  border: 1px solid rgba(37, 99, 235, 0.12);
  text-align: center;
  color: var(--text);
  line-height: 1.5;
}

.flow-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--soft);
  font-weight: 700;
}

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

.compare-card {
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  box-shadow: var(--shadow-soft);
}

.library-card {
  display: grid;
  gap: 12px;
}

.compare-card.good {
  border-color: rgba(15, 157, 88, 0.18);
}

.compare-card.bad {
  border-color: rgba(180, 35, 24, 0.16);
}

.compare-card ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.conclusion-card {
  margin-top: 14px;
}

.count-pill {
  background: rgba(15, 118, 110, 0.08);
  border-color: rgba(15, 118, 110, 0.16);
  color: var(--accent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

@media (max-width: 1180px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(200, 210, 227, 0.72);
  }
}

@media (max-width: 980px) {
  .hero,
  .tier-grid,
  .card-grid,
  .compare-grid,
  .library-grid,
  .flow-panel {
    grid-template-columns: 1fr;
  }

  .topbar,
  .chapter-head,
  .section-card-head {
    flex-direction: column;
  }

  .chapter-tools {
    justify-content: flex-start;
  }

  .flow-step:not(:last-child)::after {
    content: "↓";
    right: 50%;
    top: auto;
    bottom: -18px;
    transform: translateX(50%);
  }
}

@media (max-width: 720px) {
  .main {
    padding: 14px;
  }

  .hero,
  .chapter,
  .section-card {
    padding: 18px;
    border-radius: 22px;
  }

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

  .nav-link {
    padding: 10px 12px;
  }
}