:root {
  --bg-deep: #0a110d;
  --bg-surface: #132219;
  --bg-surface-alt: #172a1f;
  --primary: #3c6e47;
  --primary-glow: rgba(60, 110, 71, 0.4);
  --accent: #d4b886;
  --accent-glow: rgba(212, 184, 134, 0.3);
  --text-main: #e4ebe6;
  --text-muted: #8a9e91;
  --border-color: #2a4232;
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-tech: 'Courier New', Courier, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-deep);
  color: var(--text-main);
  margin: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
}

a:hover {
  color: var(--text-main);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

h1,
h2,
h3,
h4 {
  color: var(--text-main);
  letter-spacing: 0.5px;
  line-height: 1.25;
}

code {
  font-family: var(--font-tech);
  font-size: 0.92em;
  color: var(--accent);
  background: rgba(212, 184, 134, 0.08);
  padding: 0.05em 0.35em;
  border-radius: 3px;
  overflow-wrap: anywhere;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text-main);
  overflow-wrap: normal;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  background: var(--accent);
  color: var(--bg-deep);
  padding: 8px 14px;
  border-radius: 4px;
  font-weight: bold;
}

.skip-link:focus {
  left: 8px;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 17, 13, 0.92);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(6px);
}

.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.brand {
  color: var(--text-main);
  font-weight: 600;
  text-decoration: none;
}

.brand:hover {
  color: var(--accent);
}

.topbar-sep {
  color: var(--border-color);
}

.topbar-label {
  font-family: var(--font-tech);
  color: var(--text-muted);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.topbar-nav {
  display: flex;
  gap: 20px;
}

.topbar-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.topbar-nav a:hover {
  color: var(--accent);
}

.topbar-project {
  font-family: var(--font-tech);
  color: var(--accent);
  font-size: 0.95rem;
  white-space: nowrap;
}

/* Hero */
.hero {
  background:
    linear-gradient(
      90deg,
      rgba(14, 26, 20, 0.95) 0%,
      rgba(14, 26, 20, 0.86) 50%,
      rgba(14, 26, 20, 0.7) 100%
    ),
    url('https://charles-forsyth.github.io/assets/hero-ai-network.jpg') center / cover no-repeat,
    linear-gradient(180deg, var(--bg-deep), var(--bg-surface));
  border-bottom: 1px solid var(--border-color);
  padding: 80px 20px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px) 0 0 / 50px 50px,
    linear-gradient(var(--border-color) 1px, transparent 1px) 0 0 / 50px 50px;
  opacity: 0.12;
  pointer-events: none;
}

.hero > * {
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 44px;
  align-items: center;
}

.kicker {
  font-family: var(--font-tech);
  color: var(--accent);
  font-size: 0.95rem;
  margin: 0 0 8px;
}

.hero h1 {
  font-size: 3.6rem;
  margin: 0 0 10px;
  text-shadow: 0 0 20px var(--primary-glow);
}

.tagline {
  font-size: 1.3rem;
  color: var(--text-main);
  margin: 0 0 16px;
}

.pitch {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
}

.cta-buttons {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 0.85rem;
  transition: all 0.3s ease;
  font-family: var(--font-tech);
}

.btn-primary {
  background-color: var(--accent);
  color: var(--bg-deep);
  border: 1px solid var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent);
  box-shadow: 0 0 25px var(--accent-glow);
}

.btn-secondary {
  background-color: var(--primary);
  border: 1px solid var(--primary);
  color: var(--text-main);
  box-shadow: 0 0 15px var(--primary-glow);
}

.btn-secondary:hover {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Terminal */
.terminal {
  background: #07100b;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55), 0 0 30px var(--primary-glow);
  overflow: hidden;
  min-width: 0;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 12px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-color);
}

.dot:first-child {
  background: var(--accent);
}

.terminal-title {
  margin-left: 8px;
  font-family: var(--font-tech);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.terminal pre,
.code-block pre {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
  font-family: var(--font-tech);
  font-size: 0.86rem;
  line-height: 1.55;
}

.terminal pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.terminal .c {
  color: var(--text-muted);
}

.terminal .p {
  color: var(--accent);
}

.hero-shot {
  margin: 56px auto 0;
  border: 1px solid var(--border-color);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  overflow: hidden;
  box-shadow: 0 -10px 60px rgba(0, 0, 0, 0.5), 0 0 40px var(--primary-glow);
  max-height: 520px;
}

/* Sections */
.section-dark {
  background-color: var(--bg-deep);
  padding: 80px 20px;
}

.section-light {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 80px 20px;
}

.section-kicker {
  font-family: var(--font-tech);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.85rem;
  margin: 0 0 6px;
}

h2 {
  font-size: 2.1rem;
  margin: 0 0 14px;
}

.section-lead {
  color: var(--text-muted);
  font-size: 1.08rem;
  max-width: 820px;
  margin: 0 0 36px;
}

.group-label {
  font-family: var(--font-tech);
  color: var(--accent);
  font-size: 1rem;
  font-weight: normal;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  margin: 40px 0 20px;
}

.group-label i {
  margin-right: 6px;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 22px 20px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 18px var(--accent-glow);
}

.card-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.card h4 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.card p {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.93rem;
}

/* Gallery */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.shot {
  margin: 0;
  background: var(--bg-deep);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.shot:hover {
  border-color: var(--accent);
  box-shadow: 0 0 22px var(--accent-glow);
}

.shot a {
  display: block;
}

.shot-wide {
  grid-column: span 2;
  grid-row: span 2;
  display: flex;
  flex-direction: column;
}

.shot-wide a {
  flex: 1;
  min-height: 0;
}

.shot-wide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top left;
}

.shot figcaption {
  padding: 12px 14px;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
}

.shot figcaption strong {
  color: var(--text-main);
}

.gallery-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 0.62fr);
  gap: 20px;
  margin-top: 20px;
  align-items: start;
}

.shot-phone img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: top;
}

/* Architecture */
.arch {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1.2fr);
  gap: 16px;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 28px;
}

.arch-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.95rem;
}

.node i {
  color: var(--accent);
  width: 1.3em;
}

.node span {
  display: block;
  font-family: var(--font-tech);
  font-weight: normal;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.node-user {
  border-color: var(--primary);
}

.node-core {
  border-color: var(--accent);
  box-shadow: 0 0 18px var(--accent-glow);
}

.node-store {
  border-style: dashed;
}

.arrow {
  color: var(--accent);
  font-size: 1.3rem;
  text-align: center;
}

.sub-head {
  font-size: 1.25rem;
  margin: 48px 0 18px;
}

.sub-head i {
  color: var(--accent);
  margin-right: 6px;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.steps li {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--primary);
  border-radius: 6px;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.steps strong {
  color: var(--text-main);
}

.step-n {
  display: inline-block;
  font-family: var(--font-tech);
  color: var(--accent);
  font-weight: bold;
  margin-bottom: 6px;
}

.note {
  color: var(--text-muted);
  margin: 18px 0 0;
  font-size: 0.95rem;
}

/* Principles */
.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.principle {
  background: var(--bg-surface-alt);
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 18px 20px;
}

.principle h4 {
  margin: 0 0 6px;
}

.principle h4 i {
  color: var(--accent);
  margin-right: 6px;
}

.principle p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.callout {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  padding: 20px 22px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: rgba(212, 184, 134, 0.06);
  color: var(--text-muted);
}

.callout > i {
  color: var(--accent);
  font-size: 1.6rem;
  margin-top: 2px;
}

.callout strong {
  color: var(--text-main);
}

/* Code blocks */
.code-block {
  background: #07100b;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  min-width: 0;
  margin-bottom: 20px;
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px 8px 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-tech);
  color: var(--accent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-tech);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-btn.copied {
  border-color: var(--primary);
  color: var(--text-main);
  background: var(--primary);
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 20px;
}

.costs {
  margin-top: 10px;
}

.costs p {
  color: var(--text-muted);
  max-width: 900px;
}

.costs strong {
  color: var(--text-main);
}

/* Links */
.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.link-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-muted);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.link-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 18px var(--accent-glow);
  color: var(--text-muted);
  transform: translateY(-2px);
}

.link-card i {
  color: var(--accent);
  font-size: 1.25rem;
  margin-top: 3px;
  width: 1.3em;
  text-align: center;
}

.link-card span {
  font-size: 0.9rem;
}

.link-card strong {
  display: block;
  color: var(--text-main);
  font-size: 1rem;
}

.disclaimer {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 28px 0 0;
}

/* Footer */
.footer {
  padding: 36px 20px;
  background: var(--bg-deep);
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.footer p {
  margin: 0;
}

.footer-links a {
  text-decoration: none;
}

/* Responsive */
@media (max-width: 1000px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .principles,
  .link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topbar-nav {
    display: none;
  }
}

@media (max-width: 860px) {
  .hero-grid,
  .two-col {
    grid-template-columns: minmax(0, 1fr);
  }

  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gallery-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .shot-phone {
    grid-column: span 2;
    max-width: 340px;
    justify-self: center;
  }

  .arch {
    grid-template-columns: minmax(0, 1fr);
  }

  .arrow i {
    transform: rotate(90deg);
  }
}

@media (max-width: 600px) {
  .hero {
    padding-top: 50px;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .tagline {
    font-size: 1.12rem;
  }

  h2 {
    font-size: 1.65rem;
  }

  .section-dark,
  .section-light {
    padding: 56px 16px;
  }

  .card-grid,
  .gallery,
  .gallery-pair,
  .principles,
  .link-grid,
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .shot-wide,
  .shot-phone {
    grid-column: auto;
    grid-row: auto;
  }

  .shot-wide img {
    height: auto;
  }

  .hero-shot {
    margin-top: 36px;
    max-height: 300px;
  }

  .arch {
    padding: 18px;
  }

  .callout {
    flex-direction: column;
    gap: 8px;
  }

  .topbar-label,
  .topbar-sep {
    display: none;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .card:hover,
  .link-card:hover {
    transform: none;
  }
}