/**
 * Optimal Works — Graphite Tech (minimal consultancy)
 * Primary #111827 · Secondary #374151 · Accent #22D3EE · BG #F3F4F6 · Text #0B0F19
 */
:root {
  --color-primary: #111827;
  --color-secondary: #374151;
  --bg-primary: #f3f4f6;
  --bg-secondary: #e5e7eb;
  --bg-elevated: #ffffff;
  --accent-start: #22d3ee;
  --accent-end: #06b6d4;
  --text-primary: #0b0f19;
  --text-secondary: #374151;
  --text-heading: #111827;
  --text-on-accent: #0b0f19;
  --border-subtle: rgba(17, 24, 39, 0.1);
  --shadow-soft: 0 4px 24px rgba(17, 24, 39, 0.06);
  --shadow-card: 0 12px 32px rgba(17, 24, 39, 0.08);
  --accent-glow: rgba(34, 211, 238, 0.35);
  --accent-muted: rgba(34, 211, 238, 0.12);
}

body.theme-light {
  font-family: Inter, system-ui, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
}

.accent-gradient-text {
  background-image: linear-gradient(90deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.accent-gradient-bg {
  background-image: linear-gradient(90deg, var(--accent-start), var(--accent-end));
}

.accent-text {
  color: var(--accent-start);
}

.bg-secondary {
  background-color: var(--bg-secondary);
}

.bg-primary {
  background-color: var(--bg-elevated);
}

.border-secondary {
  border-color: var(--border-subtle);
}

.hero-glow {
  background-image: radial-gradient(ellipse at 50% 20%, rgba(34, 211, 238, 0.08) 0%, transparent 68%);
}

.cta-button {
  background-color: var(--accent-start);
  color: var(--text-on-accent);
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
  background-color: var(--accent-end);
  box-shadow: 0 4px 14px var(--accent-glow);
  transform: translateY(-1px);
}

.reveal {
  opacity: 1;
  transform: translateY(0);
}

html.js .reveal:not(.is-revealed) {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js .reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
}

.nav-link:hover {
  color: var(--text-heading);
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent-start);
  transition: width 0.25s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--text-heading);
  font-weight: 600;
}

.site-header {
  background-color: rgba(255, 255, 255, 0.9);
  border-bottom-color: var(--border-subtle);
}

#mobile-menu {
  background-color: var(--bg-elevated);
  border-color: var(--border-subtle);
}

.logo-blend {
  filter: none;
  mix-blend-mode: normal;
}

.logo-wordmark {
  display: block;
  height: auto;
  max-height: 2.5rem;
  width: auto;
}

footer .logo-wordmark {
  max-height: 2rem;
}

.site-breadcrumb-bar {
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
}

.site-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.4;
}

.site-breadcrumb li {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
}

.site-breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  color: rgba(74, 85, 104, 0.45);
}

.site-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-breadcrumb a:hover {
  color: var(--accent-start);
}

.site-breadcrumb [aria-current='page'] {
  color: var(--text-heading);
  font-weight: 500;
}

.site-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-start);
  text-decoration: none;
}

.site-back-link:hover {
  color: var(--accent-end);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--accent-start);
  color: var(--text-on-accent);
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 0.5rem 0;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

.lane-card {
  border-left-width: 3px;
  border-left-style: solid;
  background-color: var(--bg-elevated);
}

.lane-card--agentic {
  border-left-color: var(--accent-start);
}

.lane-card--data {
  border-left-color: var(--color-secondary);
}

.lane-card--regulatory {
  border-left-color: var(--color-primary);
}

.topic-hub-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.topic-hub-card:hover {
  border-color: var(--accent-start);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.topic-hub-label {
  font-weight: 700;
  color: var(--text-heading);
  font-size: 0.95rem;
}

.topic-hub-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.topic-hub--agentic {
  border-top: 3px solid var(--accent-start);
}

.topic-hub--regulatory {
  border-top: 3px solid var(--color-secondary);
}

.topic-hub--consulting {
  border-top: 3px solid var(--accent-start);
}

h1,
h2,
h3,
.font-display {
  font-family: 'Source Serif 4', Georgia, serif;
  color: var(--text-heading);
}

.venture-card {
  background-color: var(--bg-elevated);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.venture-card:focus-within,
.venture-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: rgba(34, 211, 238, 0.45);
}

.filter-btn {
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.filter-btn:hover {
  border-color: var(--accent-start);
  color: var(--text-heading);
}

.filter-btn.active {
  background-color: var(--accent-start);
  color: var(--text-on-accent);
  border-color: var(--accent-start);
}

.article-card {
  background-color: var(--bg-elevated);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card) !important;
  border-color: rgba(34, 211, 238, 0.4) !important;
}

.form-input {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-heading);
}

.form-input:focus {
  outline: 0;
  border-color: var(--accent-start);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.form-input::placeholder {
  color: #94a3b8;
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

.legal-prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-heading);
}

.legal-prose p,
.legal-prose li {
  margin-top: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.legal-prose a {
  color: var(--accent-start);
}

.hp-field {
  display: none;
}

/* Article reading */
.article-hero-band {
  background: linear-gradient(180deg, #e5e7eb 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-subtle);
}

.article-hero-band .section-kicker,
.article-hero-band .accent-text {
  color: var(--accent-start);
}

.article-hero-band h1 {
  color: var(--text-heading);
}

.article-hero-band .text-gray-400,
.article-hero-band .article-hero-meta {
  color: var(--text-secondary);
}

/* Site footer */
.site-footer {
  background-color: var(--color-primary);
  color: #9ca3af;
  border-top-color: rgba(255, 255, 255, 0.08);
}

.site-footer .text-gray-500 {
  color: #9ca3af;
}

.site-footer .footer-nav-links a {
  color: #d1d5db;
}

.site-footer .footer-nav-links a:hover {
  color: var(--accent-start);
}

.site-footer a[href^='mailto'] {
  color: #d1d5db;
}

.site-footer a[href^='mailto']:hover {
  color: var(--accent-start);
}

/* Insight list badges */
.insight-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 9999px;
  border: 1px solid transparent;
}

.insight-badge--featured {
  color: #0e7490;
  background: var(--accent-muted);
  border-color: rgba(34, 211, 238, 0.35);
}

.insight-badge--default {
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border-color: var(--border-subtle);
}

/* Article gradient placeholder → hidden on light theme cards with images */
body.theme-light .article-card .bg-gradient-to-br {
  background: linear-gradient(135deg, #e5e7eb 0%, #ecfeff 100%) !important;
}

.article-content h1,
.article-content h2,
.article-content h3 {
  color: var(--text-heading);
}

.article-content li,
.article-content p {
  color: var(--text-primary);
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content strong {
  color: var(--text-heading);
  font-weight: 600;
}

.article-content a {
  color: var(--accent-start);
  text-decoration: underline;
}

.article-cta-strip {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0;
}

.article-cta-strip h2 {
  color: var(--text-heading);
}

.article-cta-strip p {
  color: var(--text-secondary);
}

a:focus,
button:focus {
  outline: 0;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-start);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  ::after,
  ::before {
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0s !important;
    scroll-behavior: auto !important;
  }

  .reveal,
  html.js .reveal:not(.is-revealed) {
    opacity: 1;
    transform: translateY(0);
  }
}

#particle-canvas {
  display: none;
}