/* ─────────────────────────────────────────────────────────────
   CaveStack — Cave Mural styles
   Palette: 8 core tokens. Amber RESTRICTED to torch, install border,
   <details> marker. Glyphs use bone/cave-brown.
   ───────────────────────────────────────────────────────────── */

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

:root {
  --base:       #0C0C0C;
  --surface:    #141414;
  --border:     #2a2a2a;
  --text:       #c9d1d9;
  --text-dim:   #8b949e;
  --heading:    #e8d5b7;  /* bone */
  --cave-brown: #c4956a;  /* ochre */
  --amber:      #F59E0B;  /* RARE: torch, install border, details marker */
  /* Terminal-only status (never in page chrome): */
  --term-green:  #3fb950;
  --term-red:    #f85149;
  --term-yellow: #FBBF24;

  --cave-wash: rgba(139,69,19,0.05);
  --torch-shadow: 0 0 40px rgba(245,158,11,0.6);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --line: 1px solid var(--border);

  --container: 1120px;
  --pad: clamp(16px, 4vw, 32px);
}

html { scroll-behavior: smooth; }

body {
  background: var(--base);
  color: var(--text);
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Cave-wall grain + radial firelight wash (fixed, decorative) */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 12% 18%, var(--cave-wash) 0%, transparent 55%),
    radial-gradient(ellipse at 88% 82%, var(--cave-wash) 0%, transparent 55%),
    radial-gradient(ellipse at 50% 50%, rgba(60,40,20,0.04) 0%, transparent 70%);
}

/* ───────── SKIP LINK (WCAG 2.4.1) ───────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--amber);
  color: var(--base);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  text-decoration: none;
  z-index: 10000;
  transition: top 0.15s;
}
.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ───────── TORCH CURSOR GLOW (pointer: fine only) ───────── */
.torch-glow {
  position: fixed;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  opacity: 0;
  transform: translate(-50%, -50%);
  background:
    radial-gradient(circle,
      rgba(245,158,11,0.14) 0%,
      rgba(245,158,11,0.09) 18%,
      rgba(196,149,106,0.05) 38%,
      transparent 72%);
  transition: opacity 0.3s;
  will-change: transform;
}
@media (hover: none), (pointer: coarse) {
  .torch-glow { display: none; }
}

/* ───────── CAVE WALL (background petroglyphs, torch-lit) ─────────
   Default: barely visible (ghost hints on wall).
   Under torch: revealed via radial mask tied to cursor (--mx, --my).
   Mask alpha: 0.85 at center (glyph shows ~85% of rendered opacity),
               0.06 at edges (glyph shows ~6% — faint shadow).
   ──────────────────────────────────────────────────────────────── */
.cave-wall {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  color: var(--heading);
  overflow: hidden;
  -webkit-mask: radial-gradient(circle 360px at var(--mx, 50%) var(--my, 50%),
      rgba(0,0,0,0.85) 0%,
      rgba(0,0,0,0.55) 32%,
      rgba(0,0,0,0.20) 65%,
      rgba(0,0,0,0.06) 100%);
          mask: radial-gradient(circle 360px at var(--mx, 50%) var(--my, 50%),
      rgba(0,0,0,0.85) 0%,
      rgba(0,0,0,0.55) 32%,
      rgba(0,0,0,0.20) 65%,
      rgba(0,0,0,0.06) 100%);
  transition: -webkit-mask-image 0.05s, mask-image 0.05s;
}
.cw-glyph {
  position: absolute;
  color: var(--heading);
  opacity: 0.55;
  filter: drop-shadow(0 0 18px rgba(245,158,11,0.18));
  pointer-events: none;
}
.cw-glyph.ochre { color: var(--cave-brown); }
@media (hover: none), (pointer: coarse) {
  /* Touch devices: no torch, so show glyphs at low static opacity */
  .cave-wall {
    -webkit-mask: none;
            mask: none;
    opacity: 0.07;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cave-wall {
    -webkit-mask: none;
            mask: none;
    opacity: 0.05;
  }
}

/* ───────── LAYOUT ───────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

main { position: relative; z-index: 2; }
footer { position: relative; z-index: 2; }

section {
  padding: clamp(64px, 10vw, 120px) 0;
  position: relative;
}

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}

/* ───────── TYPOGRAPHY ───────── */
h1 {
  font-family: 'Satoshi', 'DM Sans', sans-serif;
  font-weight: 900;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--heading);
  text-wrap: balance;
}
h2 {
  font-family: 'Satoshi', 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--heading);
  margin-bottom: 20px;
  text-wrap: balance;
}
p { max-width: 62ch; }
a {
  color: var(--heading);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.15s, color 0.15s;
}
a:hover { text-decoration-color: var(--cave-brown); color: var(--cave-brown); }
a:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 2px; }

code, pre, .mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.92em;
}

/* ───────── HERO ───────── */
.hero {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: clamp(80px, 12vw, 140px);
  padding-bottom: clamp(48px, 8vw, 80px);
  position: relative;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
}
@media (max-width: 760px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-glyph { order: -1; max-width: 160px; }
}
.hero-copy .hero-sub {
  font-family: 'Satoshi', 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--cave-brown);
  margin-top: 16px;
  letter-spacing: 0.02em;
  font-style: italic;
  opacity: 0.88;
}
.hero-copy .lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text);
  margin-top: 20px;
  max-width: 56ch;
}
.hero-glyph {
  width: clamp(180px, 18vw, 240px);
  height: auto;
  opacity: 0.85;
}

/* ───────── INSTALL BOX (amber border — one of three amber uses) ───────── */
.install {
  margin-top: 40px;
  display: flex;
  align-items: stretch;
  gap: 0;
  max-width: 640px;
  border: 1.5px solid var(--amber);
  border-radius: var(--radius-md);
  background: rgba(245,158,11,0.04);
  box-shadow: var(--torch-shadow);
  overflow: hidden;
}
.install code {
  flex: 1;
  padding: 18px 20px;
  font-size: 15px;
  color: var(--heading);
  background: transparent;
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: thin;
}
.install-copy {
  background: var(--amber);
  color: var(--base);
  border: 0;
  padding: 0 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.install-copy:hover { background: #FDB738; }
.install-copy:active { background: #D97F07; }
.install-copy:focus-visible { outline: 2px solid var(--heading); outline-offset: -4px; }
.install-copy[data-copied="1"] { background: var(--term-green); color: var(--base); }

/* ───────── DEMO / REVIEW COMPARISON (split pane) ───────── */
.demo {
  background: var(--surface);
  border-top: var(--line);
  border-bottom: var(--line);
}
.compare-split {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  background: #0A0A0A;
  border: var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.6);
}
.compare-pane {
  display: flex;
  flex-direction: column;
  min-height: 420px;
  max-height: 620px;
  background: #0A0A0A;
  border-right: var(--line);
}
.compare-pane:last-child { border-right: 0; }
.pane-verbose { background: #0C0C0C; }
.pane-caveman { background: #0F0F0F; }
.pane-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: var(--line);
  background: #141414;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.pane-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}
.pane-dot.amber { background: var(--amber); box-shadow: 0 0 12px rgba(245,158,11,0.6); }
.compare-pane pre {
  flex: 1;
  padding: 20px;
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text);
  overflow-y: auto;
  white-space: pre-wrap;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.pane-caveman pre { color: var(--heading); }
.compare-pane pre::-webkit-scrollbar { width: 6px; }
.compare-pane pre::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.compare-meta {
  margin-top: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: right;
  font-weight: 600;
}
@media (max-width: 760px) {
  .compare-split { grid-template-columns: 1fr; }
  .compare-pane { border-right: 0; border-bottom: var(--line); min-height: 320px; max-height: 480px; }
  .compare-pane:last-child { border-bottom: 0; }
  .compare-pane pre { font-size: 12.5px; padding: 16px; }
}

/* ───────── SKILLS GRID ───────── */
.skills-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.skill-card {
  position: relative;
  background: var(--surface);
  border: var(--line);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s;
  overflow: hidden;
}
.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(196,149,106,0.03), transparent 60%);
  pointer-events: none;
}
.skill-card:hover {
  border-color: var(--cave-brown);
  transform: translateY(-2px);
}
.skill-card:focus-within {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}
.skill-slash {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 8px;
}
.skill-desc {
  font-size: 14.5px;
  color: var(--text-dim);
  line-height: 1.55;
}

/* Glyph accents on skill cards — bone color, low opacity */
.skill-glyph {
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 48px;
  height: 48px;
  opacity: 0.12;
  color: var(--heading);
  pointer-events: none;
}

/* ───────── DETAILS (verbose docs, collapsed) ───────── */
.docs-details {
  margin-top: 48px;
  border: var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}
.docs-details[open] { border-color: var(--cave-brown); }
.docs-details > summary {
  list-style: none;
  padding: 24px 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: clamp(20px, 2.5vw, 28px);
  color: var(--heading);
  user-select: none;
  transition: background 0.15s;
}
.docs-details > summary::-webkit-details-marker { display: none; }
.docs-details > summary::before {
  content: '▸';
  font-family: 'JetBrains Mono', monospace;
  color: var(--amber);   /* one of three amber uses */
  font-size: 20px;
  transition: transform 0.2s;
}
.docs-details[open] > summary::before { transform: rotate(90deg); }
.docs-details > summary:hover { background: rgba(196,149,106,0.04); }
.docs-details > summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}
.docs-body {
  padding: 8px 28px 32px;
  border-top: var(--line);
  display: grid;
  gap: 32px;
}
.docs-body h3 {
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--heading);
  margin-top: 24px;
  margin-bottom: 12px;
}
.docs-body h3:first-child { margin-top: 0; }
.docs-body ul { padding-left: 24px; }
.docs-body li { margin-bottom: 8px; color: var(--text); }
.docs-body code {
  background: #0A0A0A;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: var(--line);
  color: var(--heading);
  font-size: 0.9em;
}
.docs-body pre {
  background: #0A0A0A;
  border: var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text);
  margin: 12px 0;
}
.docs-body pre code { background: transparent; border: 0; padding: 0; }

/* ───────── FOOTER ───────── */
footer {
  border-top: var(--line);
  padding: 48px 0 64px;
  background: linear-gradient(180deg, var(--base) 0%, #060606 100%);
  position: relative;
}
footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  justify-content: space-between;
  align-items: flex-start;
}
.foot-brand {
  font-family: 'Satoshi', sans-serif;
  font-weight: 900;
  font-size: 24px;
  color: var(--heading);
  letter-spacing: -0.02em;
}
.foot-tag {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 4px;
}
.foot-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.foot-links a {
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
}
.foot-links a:hover { color: var(--heading); }
.foot-attrib {
  width: 100%;
  padding-top: 24px;
  margin-top: 24px;
  border-top: var(--line);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  align-items: baseline;
}
.foot-attrib a {
  color: var(--heading);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dotted var(--cave-brown);
}
.foot-attrib a:hover { color: var(--cave-brown); border-bottom-color: var(--heading); }
.foot-meta {
  width: 100%;
  padding-top: 16px;
  margin-top: 16px;
  border-top: var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ───────── FIRELIGHT FLICKER (hero glyph + install box) ───────── */
@keyframes flicker {
  0%, 100% { opacity: 0.85; }
  25%      { opacity: 0.78; }
  50%      { opacity: 0.92; }
  75%      { opacity: 0.82; }
}
.flicker { animation: flicker 6s ease-in-out infinite; }

/* ───────── REDUCED MOTION ───────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .torch-glow { display: none !important; }
  .cursor::after { animation: none; }
  .flicker { animation: none; }
}

/* ───────── RESPONSIVE ───────── */
@media (max-width: 640px) {
  section { padding: 56px 0; }
  .install { flex-direction: column; max-width: 100%; }
  .install code { white-space: pre-wrap; overflow-wrap: anywhere; }
  .install-copy { padding: 14px 24px; }
  .terminal-body { font-size: 12.5px; padding: 18px; min-height: 260px; }
  .docs-details > summary { padding: 18px 20px; }
  .docs-body { padding: 8px 20px 24px; }
  footer .container { flex-direction: column; }
}