:root {
  --font-display: "Merriweather", "Times New Roman", serif;
  --font-body: "Montserrat", "Segoe UI", sans-serif;
  --color-bg: #f8fafb;
  --color-bg-alt: #eef4f8;
  --color-surface: #ffffff;
  --color-surface-muted: #f0f4f8;
  --color-primary: #1e5a8a;
  --color-primary-dark: #0d47a1;
  --color-accent: #d9772e;
  --color-accent-strong: #2e8b57;
  --color-text: #1e3a5f;
  --color-text-muted: #5a6b7f;
  --color-border: #e0e5eb;
  --color-nav-bg: #1e3a5f;
  --color-nav-text: #ffffff;
}

.dark {
  --color-bg: #0f172a;
  --color-bg-alt: #111c2d;
  --color-surface: #1e293b;
  --color-surface-muted: #334155;
  --color-primary: #3b82f6;
  --color-primary-dark: #1e40af;
  --color-accent: #f59e0b;
  --color-accent-strong: #14b8a6;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-nav-bg: #0f172a;
  --color-nav-text: #f8fafc;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgba(30, 90, 138, 0.08), transparent 32%),
    radial-gradient(circle at 92% 0%, rgba(46, 139, 87, 0.08), transparent 24%),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(30, 90, 138, 0.05), transparent 18rem);
  opacity: 1;
  z-index: 0;
}

.dark body::before {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.08), transparent 20rem);
}

img {
  display: block;
}

.page-shell {
  position: relative;
  isolation: isolate;
}

.page-shell::after {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 24rem;
  height: 24rem;
  background: radial-gradient(circle, rgba(30, 90, 138, 0.12) 0%, transparent 72%);
  filter: blur(48px);
  z-index: -1;
  pointer-events: none;
}

.display-font {
  font-family: var(--font-display);
  letter-spacing: -0.025em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 0;
  color: var(--color-primary);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.dark .eyebrow {
  color: #93c5fd;
}

.nav-shell {
  background: var(--color-nav-bg);
  color: var(--color-nav-text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.18);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.nav-shell.is-scrolled {
  transform: translateY(-2px);
  box-shadow: 0 22px 56px rgba(15, 23, 42, 0.24);
  border-color: rgba(255, 255, 255, 0.16);
}

.nav-link {
  color: rgba(255, 255, 255, 0.82);
  transition: color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active {
  color: white;
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.nav-dropdown {
  background: rgba(24, 53, 87, 0.98);
  color: var(--color-nav-text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.32);
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-panel {
  background: var(--color-nav-bg);
  color: white;
}

.hero-black-band {
  background: rgba(15, 23, 42, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
}

.paper-card {
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 16px 40px rgba(30, 58, 95, 0.08);
}

.dark .paper-card {
  border-color: var(--color-border);
  background: var(--color-surface);
}

.section-rule {
  width: 3rem;
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary) 0%, transparent 100%);
}

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 46rem;
  overflow: hidden;
}

.comparison-table thead th {
  padding: 1rem 1rem 1rem 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: #f0f7ff;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table tbody td {
  padding: 1rem;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.65;
}

.comparison-table tbody tr:nth-child(odd) td {
  background: var(--color-surface-muted);
}

.comparison-table tbody tr:nth-child(even) td {
  background: var(--color-surface);
}

.dark .comparison-table thead th {
  background: rgba(30, 58, 95, 0.92);
}

.dark .comparison-table tbody tr:nth-child(odd) td {
  background: rgba(30, 41, 59, 0.9);
}

.dark .comparison-table tbody tr:nth-child(even) td {
  background: rgba(51, 65, 85, 0.78);
}

.footer-panel {
  background: var(--color-nav-bg);
  color: var(--color-nav-text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.22);
}

.logo-invert {
  filter: brightness(0) invert(1);
}

.content-flow > * + * {
  margin-top: 1rem;
}

.content-flow p,
.content-flow li,
.content-flow dd {
  line-height: 1.72;
  color: var(--color-text-muted);
}

.content-flow ul,
.content-flow ol {
  padding-left: 1.15rem;
}

.content-flow li + li {
  margin-top: 0.55rem;
}

.resource-tile:hover,
.resource-tile:focus-visible {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

@media (max-width: 768px) {
  .comparison-table {
    min-width: 40rem;
  }
}