/* Retro shared theme — tokens, nav, footer, buttons, common containers.
   index.html keeps its full inline stylesheet for now; sub-pages (setup/,
   cli/, docs/, examples/) link this so they stay visually consistent. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #131418;
  --bg-secondary: #181a1f;
  --bg-card: #1d1f25;
  --bg-code: #111318;
  --border: #282a32;
  --border-subtle: #222430;
  --text-primary: #ededed;
  --text-secondary: #8a8d98;
  --text-tertiary: #555860;
  --accent: #3ecf8e;
  --accent-dim: #2a9d6a;
  --accent-glow: rgba(62, 207, 142, 0.12);
  --purple: #9d8aff;
  --blue: #6cb6ff;
  --orange: #e09956;
  --pink: #e879a8;

  --shadow-raised:
    6px 6px 16px 0 rgba(5, 6, 8, 0.85),
    -4px -4px 12px 0 rgba(35, 37, 44, 0.35);
  --shadow-raised-sm:
    3px 3px 8px 0 rgba(5, 6, 8, 0.85),
    -2px -2px 6px 0 rgba(35, 37, 44, 0.35);
  --shadow-raised-lg:
    10px 10px 30px 0 rgba(5, 6, 8, 0.9),
    -6px -6px 20px 0 rgba(35, 37, 44, 0.3);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(135deg, rgba(62, 207, 142, 0.018) 1px, transparent 1px),
    linear-gradient(225deg, rgba(62, 207, 142, 0.018) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, rgba(0,0,0,0.6) 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, rgba(0,0,0,0.6) 0%, transparent 100%);
}

body > * { position: relative; z-index: 1; }

/* ── Nav ──────────────────────────────────────────────── */

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(19, 20, 24, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

/* Tensorpunk Labs brand mark (upper left, links to tensorpunklabs.com) */
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}
.nav-brand-icon {
  font-family: 'Futura', 'Jost', 'Trebuchet MS', sans-serif;
  font-weight: 700;
  font-size: 22px;
  color: var(--text-primary);
  line-height: 1;
}
.nav-brand-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1.8px;
  text-transform: uppercase;
  white-space: nowrap;
}
.nav-brand-text b { color: var(--text-primary); font-weight: 700; }
.nav-brand-product { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent); }

/* Use a compound selector so we beat `.nav-links a` on specificity. */
.nav-links a.nav-cta,
a.nav-cta {
  padding: 8px 16px;
  background: var(--accent);
  color: #000;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s;
}
.nav-links a.nav-cta:hover,
a.nav-cta:hover {
  background: #4de09e;
  color: #000;
  box-shadow: 0 0 16px var(--accent-glow);
}

/* Hamburger — hidden on desktop, shown on mobile */
.hamburger {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 38px; height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
}
.hamburger svg { width: 18px; height: 18px; stroke: currentColor; stroke-width: 2; fill: none; }
.hamburger:hover { border-color: var(--accent); color: var(--accent); }

/* Mobile nav dropdown */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px; right: 12px; left: 12px;
  z-index: 99;
  background: rgba(17, 19, 24, 0.97);
  backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  box-shadow: var(--shadow-raised-lg);
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.18s, transform 0.18s;
}
.mobile-nav.open {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.mobile-nav a {
  display: block;
  padding: 12px 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 8px;
  transition: color 0.15s, background 0.15s;
}
.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--accent);
  background: rgba(62, 207, 142, 0.08);
}

/* ── Page container ───────────────────────────────────── */

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 140px 32px 80px;
}

.page h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.1;
  margin-bottom: 16px;
}

.page-eyebrow {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 16px;
}

.page-lede {
  font-size: 19px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 56px;
  max-width: 640px;
}

.page h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 56px 0 16px;
}

.page h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 32px 0 12px;
}

.page p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.page p strong, .page li strong { color: var(--text-primary); font-weight: 600; }

.page a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.15s; }
.page a:hover { border-bottom-color: var(--accent); }

.page ul, .page ol { padding-left: 24px; margin-bottom: 16px; color: var(--text-secondary); }
.page li { margin-bottom: 8px; line-height: 1.7; }

.page table { width: 100%; border-collapse: collapse; margin: 24px 0 32px; font-size: 14px; }
.page th, .page td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.page th { color: var(--text-secondary); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; background: var(--bg-secondary); }
.page td { color: var(--text-secondary); }
.page td:first-child, .page td:first-child code { color: var(--text-primary); font-weight: 500; }

.page code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--accent);
}

.page pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 16px 0 24px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  box-shadow: var(--shadow-raised-sm);
}
.page pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.page pre .kw { color: var(--purple); }
.page pre .at { color: var(--accent); }
.page pre .str { color: var(--orange); }
.page pre .comment { color: #444; font-style: italic; }
.page pre .prompt { color: var(--text-tertiary); user-select: none; margin-right: 6px; }
.page pre .cmd { color: var(--text-primary); }

.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 18px 22px;
  margin: 24px 0;
  color: var(--text-secondary);
  box-shadow: var(--shadow-raised-sm);
}
.callout strong { color: var(--text-primary); }

/* ── Buttons ──────────────────────────────────────────── */

.btn-primary {
  display: inline-block;
  padding: 12px 24px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}
.btn-primary:hover { background: #4de09e; box-shadow: 0 0 24px var(--accent-glow), var(--shadow-raised-sm); }

.btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}
.btn-secondary:hover { border-color: #333; background: var(--bg-card); box-shadow: var(--shadow-raised-sm); }

/* ── Footer ───────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border-subtle);
  padding: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 80px;
}
footer a { color: var(--text-secondary); text-decoration: none; }
footer a:hover { color: var(--accent); }

/* ── Mobile ───────────────────────────────────────────── */

@media (max-width: 820px) {
  .nav-links { display: none; }
  .hamburger { display: inline-flex; }
  .nav-brand-text { letter-spacing: 1.4px; font-size: 11px; }
}

@media (max-width: 720px) {
  nav { padding: 12px 16px; }
  .page { padding: 110px 18px 40px; }
  .page h1 { font-size: 32px; letter-spacing: -1px; }
  .page-lede { font-size: 16px; margin-bottom: 36px; }
  .page h2 { font-size: 24px; }
  .page pre { padding: 14px 16px; font-size: 12px; }
}

@media (max-width: 420px) {
  /* Ultra-small: shorten brand text to just "TENSORPUNK LABS" */
  .nav-brand-product { display: none; }
}