/* ceaksan v2 dark-first design tokens */
:root {
  --surface: #0c1324;
  --surface-card: #0b1324;
  --surface-low: #151b2d;
  --surface-container: #191f31;
  --surface-high: #23293c;
  --border: #0c2656;
  --on-surface: #dce1fb;
  --on-surface-variant: #c2c6d8;
  --outline: #8c90a1;
  --outline-variant: #424655;
  --primary: #005ded;
  --primary-light: #b3c5ff;
  --primary-dark: #0c2756;
  --secondary: #4edea3;
  --max-width: 760px;
  --font-sans:
    "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Roboto",
    "Helvetica Neue", sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--surface);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--on-surface);
  background: var(--surface);
  margin: 0;
  padding: 32px 24px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary-light);
  text-decoration: underline;
  text-decoration-color: rgba(179, 197, 255, 0.35);
  text-underline-offset: 3px;
  transition:
    color 0.12s ease,
    text-decoration-color 0.12s ease;
}

a:hover {
  color: #fff;
  text-decoration-color: var(--primary-light);
}

a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 2px;
}

code {
  font-family: var(--font-mono);
  background: var(--surface-low);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  color: var(--primary-light);
}

.arch-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

h1 {
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1.1;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
  color: #fff;
}

/* Hero */
.arch-hero {
  margin: 24px 0 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.arch-eyebrow {
  color: var(--outline);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 20px;
}

.arch-tagline {
  font-size: 19px;
  color: var(--on-surface-variant);
  margin: 4px 0 28px;
  max-width: 620px;
}

.arch-lede {
  font-size: 17px;
  color: var(--on-surface);
  margin: 0 0 32px;
  max-width: 640px;
}

.arch-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 0;
}

.arch-cta {
  display: inline-block;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid transparent;
  transition:
    background 0.12s ease,
    border-color 0.12s ease,
    color 0.12s ease;
}

.arch-cta-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.arch-cta-primary:hover {
  background: #1a6fff;
  border-color: #1a6fff;
  color: #fff;
  text-decoration: none;
}

.arch-cta-secondary {
  color: var(--on-surface);
  background: transparent;
  border-color: var(--outline-variant);
}

.arch-cta-secondary:hover {
  border-color: var(--primary-light);
  color: #fff;
  background: rgba(0, 93, 237, 0.08);
  text-decoration: none;
}

.arch-cta:focus-visible {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

/* Sections */
.arch-section {
  margin: 56px 0;
}

.arch-section h2 {
  font-family: var(--font-mono);
  font-size: 22px;
  margin: 0 0 18px;
  letter-spacing: -0.005em;
  color: #fff;
}

.arch-section p {
  margin: 0 0 16px;
  max-width: 640px;
  color: var(--on-surface);
}

.arch-section strong {
  color: #fff;
  font-weight: 600;
}

.arch-hint {
  color: var(--outline);
  font-size: 14px;
}

/* Depth-levels table */
.arch-table-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-card);
}

.arch-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

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

.arch-table th {
  background: var(--surface-low);
  font-weight: 600;
  color: var(--outline);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

.arch-table strong {
  color: var(--primary-light);
  font-family: var(--font-mono);
}

/* Inside the template (two-col list) */
.arch-twocol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin: 20px 0;
}

.arch-col h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--outline);
  margin: 0 0 12px;
  font-weight: 600;
}

.arch-list {
  margin: 0;
  padding-left: 22px;
  font-size: 15px;
  color: var(--on-surface-variant);
}

.arch-list li {
  margin-bottom: 6px;
}

.arch-list li::marker {
  color: var(--outline-variant);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* Three real examples (cards) */
.arch-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 20px 0;
}

.arch-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--on-surface);
  background: var(--surface-card);
  transition:
    border-color 0.12s ease,
    transform 0.12s ease,
    background 0.12s ease;
}

.arch-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  background: var(--surface-low);
  text-decoration: none;
  color: var(--on-surface);
}

.arch-card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  background: rgba(0, 93, 237, 0.18);
  color: var(--primary-light);
  padding: 3px 8px;
  border-radius: 3px;
  margin-bottom: 10px;
}

.arch-card h3 {
  font-size: 16px;
  margin: 0 0 6px;
  color: #fff;
  font-weight: 600;
}

.arch-card p {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--on-surface-variant);
  line-height: 1.5;
}

.arch-card-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--outline);
}

/* FAQ accordion */
.arch-faq {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.arch-faq:first-of-type {
  border-top: 1px solid var(--border);
}

.arch-faq summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  padding-right: 28px;
  position: relative;
  color: var(--on-surface);
  transition: color 0.12s ease;
}

.arch-faq summary:hover {
  color: var(--primary-light);
}

.arch-faq summary::-webkit-details-marker {
  display: none;
}

.arch-faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-weight: 400;
  color: var(--outline);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
}

.arch-faq[open] summary {
  color: #fff;
}

.arch-faq[open] summary::after {
  content: "\2212";
  color: var(--primary-light);
}

.arch-faq summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.arch-faq p {
  margin: 14px 0 4px;
  color: var(--on-surface-variant);
  font-size: 15px;
}

/* Footer */
.arch-footer {
  margin: 72px 0 32px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}

.arch-footer-eyebrow {
  color: var(--outline);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.arch-footer-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}

.arch-footer-list li {
  margin-bottom: 10px;
  font-size: 15px;
}

.arch-footer-list a {
  color: var(--on-surface);
  text-decoration: none;
}

.arch-footer-list a strong {
  color: #fff;
  font-weight: 600;
}

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

.arch-footer-list a:hover strong {
  color: var(--primary-light);
}

.arch-footer-meta {
  color: var(--outline);
  font-size: 13px;
  margin: 0;
  font-family: var(--font-mono);
}

.arch-footer-meta a {
  color: var(--outline);
  text-decoration: none;
}

.arch-footer-meta a:hover {
  color: var(--primary-light);
  text-decoration: none;
}

/* Mobile */
@media (max-width: 640px) {
  body {
    padding: 20px 16px;
  }
  h1 {
    font-size: 30px;
  }
  .arch-section h2 {
    font-size: 20px;
  }
  .arch-tagline {
    font-size: 17px;
  }
  .arch-lede {
    font-size: 16px;
  }
  .arch-ctas {
    flex-direction: column;
    align-items: stretch;
  }
  .arch-cta {
    text-align: center;
  }
  .arch-twocol {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .arch-cards {
    grid-template-columns: 1fr;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}