:root {
  --bg-0: #0a1018;
  --bg-1: #121b27;
  --bg-2: #1f2d3f;
  --ink: #0a0a0a;
  --paper: #f6f3e9;
  --acid: #9fff2f;
  --cyan: #58e2ff;
  --amber: #ffcd52;
  --shadow: 8px 8px 0 #000;
  --border: 3px solid #000;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Mono", "Courier New", monospace;
  color: var(--paper);
  background:
    radial-gradient(900px 500px at 10% -20%, #264f6d 0%, transparent 70%),
    radial-gradient(900px 500px at 90% 0, #5d2f76 0%, transparent 68%),
    linear-gradient(155deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-2) 100%);
}

.noise-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.22;
  background:
    linear-gradient(transparent 95%, rgba(255, 255, 255, 0.08) 96%),
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.04) 0,
      rgba(255, 255, 255, 0.04) 1px,
      transparent 1px,
      transparent 22px
    );
  background-size: 100% 4px, auto;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1120px, 95vw);
  margin: 0 auto;
  padding: 22px 0 34px;
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border: var(--border);
  background: #0f1723;
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--acid);
  font-family: "Archivo Black", Impact, sans-serif;
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border: 2px solid #000;
  background: #fff;
  padding: 3px;
}

.nav-cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.cta {
  border: var(--border);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  padding: 9px 12px;
  box-shadow: 4px 4px 0 #000;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.cta:hover,
.cta:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #000;
}

.cta-primary {
  background: var(--acid);
}

.library-cta {
  display: inline-block;
  margin-top: 12px;
}

.content {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.hero {
  padding: 0 0 18px;
}

.terminal-card {
  border: var(--border);
  background: #12161d;
  box-shadow: var(--shadow);
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: var(--border);
  background: #202a39;
  padding: 10px 14px;
}

.window-bar span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #000;
}

.window-bar span:nth-child(1) {
  background: #ff6c6c;
}

.window-bar span:nth-child(2) {
  background: #ffd04f;
}

.window-bar span:nth-child(3) {
  background: #66f06a;
}

.window-bar p {
  margin: 0 0 0 8px;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: #d1f2ff;
  letter-spacing: 0.08em;
}

.hero .prompt {
  margin: 18px 18px 0;
  color: var(--acid);
  font-weight: 700;
}

.hero h1 {
  margin: 12px 18px 8px;
  font-family: "Archivo Black", Impact, sans-serif;
  text-transform: uppercase;
  line-height: 1.08;
  letter-spacing: 0.01em;
  font-size: clamp(1.5rem, 4.8vw, 3.2rem);
  max-width: none;
}

.hero .subtext {
  margin: 0 18px;
  color: var(--cyan);
  font-size: clamp(0.95rem, 2vw, 1.22rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.panel {
  border: var(--border);
  background: #141d29;
  box-shadow: var(--shadow);
  padding: 14px;
}

.panel-title h2 {
  margin: 4px 0;
  font-family: "Archivo Black", Impact, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: clamp(1.2rem, 2.4vw, 1.75rem);
}

.panel-title p {
  margin: 0;
  color: #c9dde8;
}

.panel-grid {
  margin-top: 14px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.panel-stack {
  margin-top: 14px;
  display: grid;
  gap: 14px;
}

.panel-grid-two {
  margin-top: 0;
  grid-template-columns: 1fr 1fr;
}

.panel-grid-steps {
  margin-top: 0;
  grid-template-columns: 1fr;
}

.panel-grid-single {
  margin-top: 0;
  grid-template-columns: 1fr;
}

.step-card {
  display: grid;
  align-content: start;
}

.step-kicker {
  margin: 0 0 8px;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
}

#setup-codex .step-card pre code {
  font-size: 0.9rem;
  line-height: 1.45;
}

.slim {
  padding: 14px;
}

.terminal-card h3 {
  margin: 0 0 10px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.92rem;
}

#browser-flow .terminal-card a:not(.cta) {
  color: var(--cyan);
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

#browser-flow .terminal-card a:not(.cta):hover,
#browser-flow .terminal-card a:not(.cta):focus-visible {
  color: var(--acid);
}

ol {
  margin: 0;
  padding-left: 20px;
  line-height: 1.6;
}

li + li {
  margin-top: 4px;
}

code {
  background: #0a0d11;
  border: 2px solid #000;
  padding: 1px 6px;
  color: var(--acid);
}

pre {
  margin: 10px 0 0;
  overflow-x: auto;
}

pre code {
  display: block;
  white-space: pre;
  padding: 10px 12px;
  font-size: 0.8rem;
}

.video-slot {
  border: var(--border);
  background: #1c2431;
  box-shadow: 5px 5px 0 #000;
  padding: 12px;
}

.video-slot-wide {
  width: 100%;
}

.video-slot p {
  margin: 0 0 10px;
  color: var(--paper);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.video-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: var(--border);
  background:
    linear-gradient(135deg, rgba(88, 226, 255, 0.22), rgba(159, 255, 47, 0.1)),
    #0c131d;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 16px;
}

.video-frame span {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  color: #daf7ff;
}

.video-frame-embed {
  padding: 0;
  display: block;
}

.video-frame-embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

#setup-codex .video-slot-wide {
  padding: 0;
}

#setup-codex .video-slot-wide > p {
  display: none;
}

#setup-codex .video-slot-wide .video-frame {
  border: 0;
}

.footer {
  margin-top: 24px;
  border: var(--border);
  background: #0e131b;
  box-shadow: var(--shadow);
  padding: 12px 14px;
}

.footer p {
  margin: 0;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: enter 480ms cubic-bezier(.2, .85, .3, 1) forwards;
}

.hero.reveal {
  animation-delay: 80ms;
}

#setup-codex.reveal {
  animation-delay: 160ms;
}

#browser-flow.reveal {
  animation-delay: 240ms;
}

#config-guide.reveal {
  animation-delay: 320ms;
}

#library.reveal {
  animation-delay: 400ms;
}

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .top-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-cta {
    width: 100%;
    justify-content: flex-start;
  }

  .panel-grid,
  .panel-grid-two,
  .panel-grid-single {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 640px) {
  .page-shell {
    width: min(1120px, 96vw);
    padding-top: 14px;
  }

  .cta {
    width: 100%;
    text-align: center;
  }
}