:root {
  --bg-canvas: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-dark: #0F172A;
  --bg-dark-elevated: #1E293B;
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --border-hairline: #E2E8F0;
  --border-dark: #334155;
  --accent-primary: #0284C7;
  --accent-hover: #0369A1;
  --font-display: "Outfit", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.18;
  color: var(--text-primary);
  margin-top: 0;
  text-wrap: balance;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 3-Zone Modern Tech Top Bar */
.site-header {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-hairline);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  height: 68px;
}

.brand-wordmark {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 150ms ease, border-color 150ms ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-hairline);
}

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

.btn-dark-outline {
  background-color: rgba(255, 255, 255, 0.06);
  color: #F8FAFC;
  border-color: var(--border-dark);
}

.btn-dark-outline:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

/* Dark-Slate Tech Hero */
.hero-tech {
  background-color: var(--bg-dark);
  color: #F8FAFC;
  padding: 56px 0;
  border-bottom: 1px solid var(--border-dark);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: stretch;
}

.kicker-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.hero-tech .kicker-meta {
  color: #94A3B8;
}

.hero-title {
  font-size: clamp(2.25rem, 4vw, 3.4rem);
  letter-spacing: -0.025em;
  color: #FFFFFF;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 60ch;
  margin-bottom: 28px;
}

.hero-tech .hero-lead {
  color: #CBD5E1;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-dark);
  background: var(--bg-dark-elevated);
  min-height: 310px;
}

.hero-media-light {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-hairline);
  background: var(--bg-subtle);
}

.hero-media img,
.hero-media-light img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Tech Spec Strip */
.standards-strip {
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  padding: 22px 0;
}

.standards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.standard-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.925rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.standard-item span {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* Sections */
.section-block {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-header h2 {
  font-size: 1.85rem;
  margin-bottom: 6px;
}

.section-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.text-link {
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
}

.text-link:hover {
  text-decoration: underline;
}

/* High-Density Comparison Table */
.table-wrap {
  overflow-x: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-hairline);
}

.data-table th {
  background: var(--bg-subtle);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background: #F8FAFC;
}

.mono-cell {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* Cards & Grids */
.guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.guide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 150ms ease;
}

.guide-card:hover {
  border-color: #94A3B8;
}

.guide-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.guide-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin: 0 0 18px;
}

/* Filter Toolbar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.search-input {
  width: 100%;
  max-width: 360px;
  padding: 10px 14px;
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  background: var(--bg-surface);
  font: inherit;
  font-size: 0.875rem;
}

.segmented-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: var(--bg-subtle);
  border-radius: 8px;
}

.tab-btn {
  border: none;
  background: transparent;
  padding: 7px 13px;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
}

.tab-btn.is-active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

/* Article Layout */
.article-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  padding: 48px 0 64px;
}

.prose-measure {
  max-width: 68ch;
}

.callout-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 24px 0;
}

.callout-box strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.code-path {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  padding: 11px 14px;
  margin: 14px 0;
  overflow-x: auto;
}

.checklist-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 24px;
  position: sticky;
  top: 92px;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.875rem;
  cursor: pointer;
}

.checklist-item:last-child {
  border-bottom: none;
}

/* Legal & Forms */
.legal-document {
  max-width: 72ch;
  padding: 48px 0 64px;
}

.legal-document h1 {
  font-size: 2.3rem;
  margin-bottom: 12px;
}

.legal-document h2 {
  font-size: 1.35rem;
  margin-top: 32px;
  margin-bottom: 10px;
}

.legal-document p, .legal-document li {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.form-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  font: inherit;
  font-size: 0.9375rem;
  background: var(--bg-canvas);
}

.alert-banner {
  padding: 16px 20px;
  border-radius: 8px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  margin-bottom: 24px;
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 48px 0 32px;
}

.footer-disclosure {
  padding: 16px 20px;
  background: var(--bg-canvas);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.footer-disclosure p {
  margin: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-hairline);
}

.footer-summary, .footer-contact-line {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: 44ch;
}

.footer-heading {
  font-family: var(--font-display);
  font-size: 0.925rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.footer-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-list li {
  margin-bottom: 9px;
}

.footer-list a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-list a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-bottom-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: underline;
}

/* Cookie Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  max-width: 520px;
  width: 100%;
  padding: 28px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.modal-header h2 {
  font-size: 1.25rem;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-intro {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.cookie-option {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--border-hairline);
}

.cookie-option strong {
  display: block;
  font-size: 0.875rem;
}

.cookie-option span {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}

@media (max-width: 900px) {
  .hero-grid,
  .article-layout,
  .guides-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .standards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .primary-nav {
    gap: 16px;
    overflow-x: auto;
  }
}