/* ============================================================
   Snake Arcade — daboiyoshi.com
   Master stylesheet | retro arcade neon aesthetic
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=VT323&family=JetBrains+Mono:wght@400;500;700&family=Press+Start+2P&display=swap');

:root {
  /* Color tokens — phosphor / CRT palette */
  --bg-deep:        #07090d;
  --bg-panel:       #0d1117;
  --bg-panel-2:     #11161f;
  --bg-grid:        rgba(57, 255, 20, 0.04);

  --fg-primary:     #e6f1e0;
  --fg-muted:       #8a9a85;
  --fg-faint:       #4a5550;

  --accent:         #39ff14;          /* phosphor green */
  --accent-soft:    #39ff1422;
  --accent-glow:    #39ff1455;
  --accent-2:       #00e1ff;          /* cyan */
  --accent-3:       #ff2d95;          /* magenta */
  --accent-warn:    #ffcb05;

  --border:         #1c2530;
  --border-bright:  #2a3a48;

  /* Typography */
  --font-display:   'Press Start 2P', 'VT323', monospace;
  --font-terminal:  'VT323', 'JetBrains Mono', monospace;
  --font-mono:      'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --font-body:      'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Scale */
  --radius:         4px;
  --radius-lg:      8px;
  --shadow-glow:    0 0 24px var(--accent-glow);
  --shadow-card:    0 8px 24px rgba(0, 0, 0, 0.5);

  /* Layout */
  --maxw:           1200px;
  --gutter:         clamp(1rem, 4vw, 2.5rem);
}

/* ============================================================
   Reset & base
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--bg-deep);
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg-primary);
  background: var(--bg-deep);
  background-image:
    radial-gradient(circle at 20% 0%,  rgba(57, 255, 20, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(0, 225, 255, 0.04) 0%, transparent 50%),
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 32px 32px, 32px 32px;
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* CRT scanline overlay — subtle */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.06) 3px,
    rgba(0, 0, 0, 0) 4px
  );
  opacity: 0.6;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted transparent;
  transition: border-color 120ms ease, color 120ms ease, text-shadow 120ms ease;
}
a:hover,
a:focus-visible {
  border-bottom-color: var(--accent);
  text-shadow: 0 0 8px var(--accent-glow);
  outline: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

::selection { background: var(--accent); color: var(--bg-deep); }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent);
  color: var(--bg-deep);
  padding: 0.5rem 1rem;
  font-weight: 700;
  z-index: 9999;
}
.skip-link:focus { top: 0; }

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

main {
  position: relative;
  z-index: 1;
  padding-bottom: 4rem;
}

/* ============================================================
   Header / nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.875rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
  border-bottom: none;
  text-shadow: 0 0 12px var(--accent-glow);
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--accent);
  background: var(--bg-deep);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 0.625rem;
  box-shadow: 0 0 12px var(--accent-glow), inset 0 0 8px rgba(57, 255, 20, 0.15);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius);
  color: var(--fg-primary);
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }

.primary-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
}

.primary-nav a {
  display: inline-block;
  padding: 0.5rem 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--fg-primary);
  border: 1px solid transparent;
  border-radius: var(--radius);
  border-bottom: 1px solid transparent;
}
.primary-nav a:hover,
.primary-nav a:focus-visible {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent-glow);
  text-shadow: none;
}
.primary-nav a[aria-current='page'] {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    top: 100%;
    right: var(--gutter);
    left: var(--gutter);
    background: var(--bg-panel);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-lg);
    padding: 0.75rem;
    box-shadow: var(--shadow-card);
    transform-origin: top right;
    transform: scale(0.95);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
  }
  .primary-nav[data-open='true'] {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
  }
  .primary-nav ul {
    flex-direction: column;
    gap: 0.125rem;
  }
  .primary-nav a {
    display: block;
    padding: 0.75rem 1rem;
  }
}

/* ============================================================
   Hero (landing)
   ============================================================ */
.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4rem);
  overflow: hidden;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--accent-glow);
  background: var(--accent-soft);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.hero-eyebrow::before {
  content: '▸ ';
  color: var(--accent);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  color: var(--fg-primary);
  text-shadow:
    0 0 8px rgba(57, 255, 20, 0.15),
    2px 2px 0 var(--accent-3),
    -2px -2px 0 var(--accent-2);
}

.hero h1 .accent {
  color: var(--accent);
  text-shadow: 0 0 16px var(--accent);
}

.hero-lead {
  font-size: clamp(1rem, 1.6vw, 1.1875rem);
  max-width: 60ch;
  color: var(--fg-muted);
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

/* Decorative blinking cursor */
.cursor {
  display: inline-block;
  width: 0.6em;
  height: 1em;
  background: var(--accent);
  margin-left: 0.1em;
  vertical-align: text-bottom;
  animation: blink 1s steps(2, end) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius);
  background: var(--bg-panel);
  color: var(--fg-primary);
  transition: all 140ms ease;
  cursor: pointer;
}
.btn:hover,
.btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: var(--shadow-glow);
  text-shadow: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
  border-color: var(--accent);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--bg-deep);
  color: var(--accent);
  text-shadow: 0 0 8px var(--accent);
}

.btn-ghost {
  background: transparent;
}

/* ============================================================
   Sections
   ============================================================ */
section { padding: clamp(2.5rem, 5vw, 4rem) 0; }

.section-head {
  margin-bottom: 2rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.4vw, 1.5rem);
  letter-spacing: 0.02em;
  color: var(--fg-primary);
}

.section-head h2::before {
  content: '// ';
  color: var(--accent);
}

.section-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================================
   Card grid
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 1rem;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 180ms ease;
  border-bottom: 1px solid var(--border);
  color: var(--fg-primary);
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 200ms ease;
}
.card:hover,
.card:focus-visible {
  border-color: var(--accent-glow);
  background: var(--bg-panel-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card), 0 0 0 1px var(--accent-glow);
  text-shadow: none;
}
.card:hover::before { opacity: 1; }

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.625rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}
.card-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent);
}

.card-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--fg-primary);
  margin-bottom: 0.625rem;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--fg-muted);
  flex-grow: 1;
  margin-bottom: 1rem;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-top: 0.875rem;
  border-top: 1px dashed var(--border);
}
.card-meta .arrow {
  color: var(--accent);
  transition: transform 180ms ease;
}
.card:hover .arrow { transform: translateX(4px); }

/* External marker */
.card[data-external="true"] .card-tag::after {
  content: '↗ EXTERNAL';
  margin-left: auto;
  color: var(--accent-2);
  font-size: 0.625rem;
}

/* ============================================================
   Article / page content
   ============================================================ */
.page-head {
  padding: clamp(2.5rem, 6vw, 4rem) 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-faint);
  margin-bottom: 1rem;
}
.crumbs a { color: var(--fg-muted); border-bottom: none; }
.crumbs a:hover { color: var(--accent); text-shadow: none; }
.crumbs span[aria-current='page'] { color: var(--accent); }

.page-head h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.15;
  margin-bottom: 0.875rem;
}

.page-head .lede {
  color: var(--fg-muted);
  font-size: 1.0625rem;
  max-width: 65ch;
}

.prose {
  max-width: 70ch;
  font-size: 1rem;
}
.prose > * + * { margin-top: 1.25rem; }
.prose h2 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  margin-top: 2.25rem;
  color: var(--accent);
}
.prose h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 2rem;
  color: var(--fg-primary);
}
.prose ul,
.prose ol { padding-left: 1.5rem; }
.prose li { margin-top: 0.375rem; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.125em 0.375em;
  color: var(--accent);
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1.25rem;
  background: var(--accent-soft);
  font-style: italic;
  color: var(--fg-primary);
}

/* ============================================================
   Launcher panel (for tools that link out)
   ============================================================ */
.launcher {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: 2rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.launcher::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, var(--accent-glow), transparent 30%, transparent 70%, var(--accent-2) 120%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

.launcher-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}
.launcher-meta strong { color: var(--accent); font-weight: 600; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h3 {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.footer-col ul { list-style: none; display: grid; gap: 0.5rem; }

.footer-col a {
  color: var(--fg-muted);
  font-size: 0.875rem;
  border-bottom: none;
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-faint);
}

/* ============================================================
   Status / banner
   ============================================================ */
.banner {
  margin: 1rem 0;
  padding: 0.875rem 1.25rem;
  border: 1px solid var(--accent-glow);
  background: var(--accent-soft);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}
.banner::before {
  content: '⬢';
  color: var(--accent);
}

/* ============================================================
   Utility
   ============================================================ */
.flex { display: flex; }
.gap-1 { gap: 1rem; }
.center { text-align: center; }
.muted { color: var(--fg-muted); }
.mono  { font-family: var(--font-mono); }
.small { font-size: 0.875rem; }
.mt-2  { margin-top: 2rem; }
.mt-3  { margin-top: 3rem; }
.glow-text { text-shadow: 0 0 12px var(--accent-glow); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  body::before { display: none; }
  .cursor { animation: none; }
}

/* Print */
@media print {
  body::before { display: none; }
  .site-header, .site-footer, .nav-toggle { display: none; }
  body { background: white; color: black; }
}