/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition:
    background var(--transition),
    border-color var(--transition);
}

.nav.scrolled {
  background: var(--bg-nav);
  border-bottom-color: var(--border);
  backdrop-filter: blur(12px);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 400;
  text-transform: uppercase;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav-brand-mark {
  display: block;
  width: 26px;
  height: 26px;
}

.nav-brand span {
  color: var(--cyan);
  text-shadow: var(--glow-red);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a.active {
  color: var(--cyan);
  text-shadow: var(--glow-red);
}

.nav-links .github-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition:
    transform var(--transition),
    opacity var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 639px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    padding: var(--space-lg);
    gap: var(--space-md);
    display: none;
    backdrop-filter: blur(12px);
  }

  .nav-links.open {
    display: flex;
  }
}

/* ---- Buttons — arcade style ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 1.5rem;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 400;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--border-radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--green);
  color: #0a2e0a;
  border-color: var(--green);
  box-shadow:
    0 0 10px rgb(110, 255, 110, 0.5),
    inset 0 0 6px rgb(255, 255, 255, 0.25);
}

.btn-primary:hover {
  background: #8cff8c;
  color: #0a2e0a;
  box-shadow:
    0 0 18px rgb(110, 255, 110, 0.85),
    inset 0 0 8px rgb(255, 255, 255, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--cyan);
  border-color: var(--border);
}

.btn-secondary:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
  text-shadow: var(--glow-red);
  transform: translateY(-1px);
}

/* ---- Cards ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

.card:hover {
  border-color: var(--text-muted);
  box-shadow: 0 4px 14px rgb(0, 0, 0, 0.35);
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ---- Badges ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.25rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.badge-green {
  border-color: var(--green);
  color: var(--green);
}

.badge-yellow {
  border-color: var(--yellow);
  color: var(--yellow);
}

/* ---- Terminal frame (video panels + .tui-demo ASCII mockups) ---- */
.terminal-frame,
.tui-demo {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgb(0, 0, 0, 0.5);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-dot.red {
  background: var(--term-dot-red);
}
.terminal-dot.yellow {
  background: var(--term-dot-yellow);
}
.terminal-dot.green {
  background: var(--term-dot-green);
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: var(--space-sm);
}

.terminal-body {
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  position: relative;
}

.terminal-body pre {
  margin: 0;
}

.terminal-body code,
.tui-demo .terminal-body pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
}

/* ---- Code block (build-time Prism highlighting) ---- */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgb(0, 0, 0, 0.5);
  margin-bottom: var(--space-md);
}

.code-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.code-block-lang {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: var(--space-sm);
}

.code-block-body {
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
}

.code-block-body pre {
  margin: 0;
}

.code-block-body code {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
}

/* Opt-in line wrapping for blocks with very long lines (data-wrap). */
.code-block[data-wrap] .code-block-body {
  overflow-x: visible;
}

.code-block[data-wrap] .code-block-body code {
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

/* Copy button — lives in the header, always visible (touch-friendly). */
.copy-btn {
  margin-left: auto;
  padding: 0.35rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.copy-btn.copied {
  color: var(--green);
  border-color: var(--green);
}

/* ---- Prism token theme → Doom palette ---- */
.code-block .token.comment,
.code-block .token.prolog,
.code-block .token.doctype,
.code-block .token.cdata {
  color: var(--text-muted);
  font-style: italic;
}
.code-block .token.punctuation {
  color: var(--text-muted);
}
.code-block .token.keyword,
.code-block .token.boolean,
.code-block .token.atrule,
.code-block .token.important {
  color: var(--purple);
}
.code-block .token.string,
.code-block .token.char,
.code-block .token.attr-value,
.code-block .token.inserted {
  color: var(--green);
}
.code-block .token.operator,
.code-block .token.entity,
.code-block .token.url {
  color: var(--cyan);
}
.code-block .token.function,
.code-block .token.builtin,
.code-block .token.class-name {
  color: var(--yellow);
}
.code-block .token.number,
.code-block .token.constant {
  color: var(--yellow);
}
.code-block .token.property,
.code-block .token.attr-name,
.code-block .token.tag,
.code-block .token.symbol,
.code-block .token.key {
  color: var(--cyan);
}
.code-block .token.variable,
.code-block .token.parameter {
  color: var(--blue);
}
.code-block .token.deleted {
  color: var(--red);
}

/* ---- Footer ---- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.footer a {
  color: var(--text-secondary);
}

.footer a:hover {
  color: var(--cyan);
  text-shadow: var(--glow-red);
}

/* ---- Step numbers ---- */
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--green);
  color: #0a2e0a;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 0.7rem;
  border-radius: 50%;
  box-shadow: var(--glow-green);
  flex-shrink: 0;
}

/* ---- Retro flicker (brand/hero) ---- */
@keyframes flicker {
  0%,
  19%,
  21%,
  23%,
  25%,
  54%,
  56%,
  100% {
    opacity: 1;
  }
  20%,
  24%,
  55% {
    opacity: 0.82;
  }
}

.flicker {
  animation: flicker 4.5s infinite steps(1);
}

@media (prefers-reduced-motion: reduce) {
  .flicker {
    animation: none;
  }
}

/* ---- GitHub icon (inline SVG) ---- */
.icon-github {
  width: 20px;
  height: 20px;
  fill: currentColor;
}