:root {
  --header-height: 96px;
  --bg-body: #010a1c;
  --bg-panel: rgba(13, 25, 46, 0.9);
  --bg-card: rgba(18, 31, 56, 0.85);
  --bg-card-solid: #0b172c;
  --bg-callout: rgba(229, 57, 53, 0.12);
  --bg-highlight: rgba(14, 116, 144, 0.15);
  --text-main: #f5f9ff;
  --text-muted: #b6c2db;
  --text-strong: #ffffff;
  --border-soft: rgba(148, 163, 184, 0.3);
  --accent: #e53935;
  --accent-soft: rgba(229, 57, 53, 0.4);
  --accent-alt: #38bdf8;
  --shadow-soft: 0 20px 45px rgba(2, 6, 23, 0.6);
}

body[data-theme='light'] {
  --bg-body: #f7f8fb;
  --bg-panel: #ffffff;
  --bg-card: #ffffff;
  --bg-card-solid: #f0f4ff;
  --bg-callout: rgba(229, 57, 53, 0.1);
  --bg-highlight: rgba(56, 189, 248, 0.1);
  --text-main: #0b1b33;
  --text-muted: #4b5a73;
  --text-strong: #051430;
  --border-soft: rgba(2, 6, 23, 0.1);
  --accent: #c62828;
  --accent-soft: rgba(198, 40, 40, 0.16);
  --accent-alt: #0ea5e9;
  --shadow-soft: 0 8px 22px rgba(12, 21, 35, 0.1);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-body);
  color: var(--text-main);
  min-height: 100%;
  scroll-behavior: smooth;
}

img {
  max-width: 100%;
  display: block;
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px clamp(24px, 4vw, 48px);
  min-height: var(--header-height);
  border-bottom: 1px solid var(--border-soft);
  backdrop-filter: blur(10px);
  background: linear-gradient(135deg, rgba(2, 6, 23, 0.8), rgba(2, 6, 23, 0.5));
}

body[data-theme='light'] .site-header {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(18px);
}

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

.brand-logo {
  height: 34px;
  width: auto;
  max-height: 34px;
  object-fit: contain;
}

body[data-theme='light'] .brand-logo {
  content: url('../images/odom-light.svg');
}

.brand-text {
  display: flex;
  flex-direction: column;
  font-size: 15px;
  line-height: 1.2;
}

.brand-name {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand-tagline {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-link {
  color: var(--text-main);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.header-link:hover {
  border-color: var(--accent);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-soft);
  background: transparent;
  color: var(--text-main);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.theme-icon {
  display: block;
}

.theme-icon-moon {
  display: none;
}

body[data-theme='light'] .theme-icon-sun {
  display: none;
}

body[data-theme='light'] .theme-icon-moon {
  display: block;
}

.site-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  flex: 1;
}

.side-nav {
  border-right: 1px solid var(--border-soft);
  padding: 32px 12px 48px;
  position: sticky;
  top: calc(var(--header-height) + 8px);
  align-self: start;
  height: fit-content;
}

.side-nav-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.side-nav-link {
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  padding: 10px 12px;
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.side-nav-link.active,
.side-nav-link:hover {
  color: var(--text-main);
  border-color: var(--accent);
  background: rgba(229, 57, 53, 0.06);
}

.content {
  padding: 48px clamp(24px, 5vw, 64px) 64px;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.section {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: 24px;
  padding: 32px clamp(24px, 4vw, 48px);
  box-shadow: var(--shadow-soft);
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.hero {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.15), transparent) var(--bg-panel);
}

.section-header {
  margin-bottom: 24px;
}

.eyebrow {
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent-alt);
  margin: 0 0 8px;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 12px;
  color: var(--text-strong);
}

p {
  margin: 0 0 16px;
  color: var(--text-main);
  line-height: 1.6;
}

.lead {
  font-size: 1.1rem;
  color: var(--text-main);
  max-width: 720px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.stat-card,
.info-card,
.layer-card,
.timeline-step,
.signal-card,
.resource-card,
.callout-card,
.note-block {
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 20px;
  background: var(--bg-card);
}

.stat-card h3 {
  margin-bottom: 8px;
}

.content-grid {
  display: grid;
  gap: 24px;
  align-items: start;
}

.content-grid.two-col {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.content-grid.three-col {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.callout-card {
  background: var(--bg-callout);
  border: none;
  color: var(--text-main);
}

.callout-card h3 {
  margin-bottom: 8px;
}

.callout-note {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stacked-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.layer-card {
  background: var(--bg-card-solid);
  border-radius: 16px;
}

.note-block {
  background: var(--bg-highlight);
  border: none;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.timeline-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.timeline-divider::before,
.timeline-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-soft);
}

.loop-clarifier {
  margin: 20px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--accent-alt);
  background: rgba(56, 189, 248, 0.1);
  border-radius: 6px;
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.6;
}

.loop-clarifier .meeting-tag {
  color: var(--accent-alt);
  font-weight: 600;
  font-style: normal;
  white-space: nowrap;
}

body[data-theme='light'] .loop-clarifier .meeting-tag {
  color: #1e3a8a;
}

.timeline-step h3 {
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.flow-note {
  margin-top: 20px;
  color: var(--text-muted);
}

.signal-card h3 {
  font-size: 1.05rem;
}

.adoption-steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.adoption-steps li {
  position: relative;
  border: 1px solid var(--border-soft);
  border-radius: 18px;
  padding: 24px 20px 20px 20px;
  background: var(--bg-card);
}

.adoption-steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 0.85rem;
  color: var(--accent-alt);
  letter-spacing: 0.2em;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.resource-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}

.resource-link {
  color: var(--accent-alt);
  font-weight: 600;
  text-decoration: none;
}

.resource-note {
  color: var(--text-muted);
  margin-top: 16px;
}

.note-block code {
  background: rgba(148, 163, 184, 0.2);
  padding: 3px 6px;
  border-radius: 6px;
}

.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 24px clamp(24px, 4vw, 48px);
  background: rgba(2, 6, 23, 0.65);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.9rem;
}

body[data-theme='light'] .site-footer {
  background: rgba(255, 255, 255, 0.9);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: var(--text-main);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-links a:hover {
  border-color: var(--accent);
}

ul {
  padding-left: 20px;
  margin: 0 0 16px;
  color: var(--text-main);
}

li {
  margin-bottom: 8px;
}

@media (max-width: 960px) {
  .site-body {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    padding: 24px;
  }

  .side-nav-links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .side-nav-link {
    font-size: 10px;
    letter-spacing: 0.16em;
    border-left: none;
    border-bottom: 2px solid transparent;
  }

  .side-nav-link.active,
  .side-nav-link:hover {
    border-left: none;
    border-bottom: 2px solid var(--accent);
  }
}

@media (max-width: 600px) {
  .site-header,
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    flex-wrap: wrap;
    width: 100%;
  }

  .content {
    padding: 32px 20px 48px;
  }

  .section {
    padding: 24px;
  }
}