/* ============================================================
   x86 Instruction Reference
   Same dark palette as the memory & endianness visualizers.
   ============================================================ */

:root {
  --bg:         #0f1115;
  --surface:    #181b22;
  --surface-2:  #1f242d;
  --border:     #2a2e38;
  --text:       #e6e8ee;
  --muted:      #8a93a6;
  --accent:     #6ea8ff;

  /* Category accent colors (subtle, used on category title borders) */
  --cat-data:    #4ea1ff;
  --cat-stack:   #38bdf8;
  --cat-arith:   #fb923c;
  --cat-logic:   #facc15;
  --cat-shift:   #eab308;
  --cat-cmp:     #c084fc;
  --cat-uncond:  #4ade80;
  --cat-cond:    #f87171;
  --cat-sys:     #a78bfa;
  --cat-flags:   #ec4899;

  /* Flag badge colors */
  --flag-read:   #6ea8ff;
  --flag-set:    #fb923c;

  --mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--mono); }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 4px; font-size: 0.9em; }
em { color: var(--accent); font-style: normal; }

/* ---------- Hero ---------- */
.hero {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #11141b 0%, var(--bg) 100%);
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 32px 32px;
}
.hero h1 {
  font-size: 2.2rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.lede {
  font-size: 1.02rem;
  color: var(--muted);
  max-width: 820px;
}
.toc {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.82rem;
}
.toc a {
  background: var(--surface);
  padding: 5px 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
}

/* ---------- Category section ---------- */
.category {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px;
  border-bottom: 1px solid var(--border);
}
.category-title {
  margin: 0 0 8px;
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  border-left: 4px solid var(--accent);
  padding-left: 12px;
}
.category-title.cat-data    { border-left-color: var(--cat-data); }
.category-title.cat-stack   { border-left-color: var(--cat-stack); }
.category-title.cat-arith   { border-left-color: var(--cat-arith); }
.category-title.cat-logic   { border-left-color: var(--cat-logic); }
.category-title.cat-shift   { border-left-color: var(--cat-shift); }
.category-title.cat-cmp     { border-left-color: var(--cat-cmp); }
.category-title.cat-uncond  { border-left-color: var(--cat-uncond); }
.category-title.cat-cond    { border-left-color: var(--cat-cond); }
.category-title.cat-sys     { border-left-color: var(--cat-sys); }
#flags-section .category-title { border-left-color: var(--cat-flags); }

.category-desc {
  color: var(--muted);
  max-width: 900px;
  margin: 0 0 22px;
}

/* ---------- Flag grid (top section) ---------- */
.flag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.flag-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  position: relative;
}
.flag-card-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}
.flag-card-abbr {
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cat-flags);
  letter-spacing: 0.04em;
}
.flag-card-full {
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.flag-card-desc {
  font-size: 0.88rem;
  color: var(--text);
  margin: 4px 0 6px;
  line-height: 1.5;
}
.flag-card-example {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  background: #0b0d12;
  padding: 6px 8px;
  border-radius: 4px;
  border-left: 2px solid var(--cat-flags);
}

/* ---------- Instruction grid ---------- */
.instr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}
.instr-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.2s, transform 0.15s;
}
.instr-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.instr-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.instr-mnem {
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}
.instr-card.cat-data    .instr-mnem { color: var(--cat-data); }
.instr-card.cat-stack   .instr-mnem { color: var(--cat-stack); }
.instr-card.cat-arith   .instr-mnem { color: var(--cat-arith); }
.instr-card.cat-logic   .instr-mnem { color: var(--cat-logic); }
.instr-card.cat-shift   .instr-mnem { color: var(--cat-shift); }
.instr-card.cat-cmp     .instr-mnem { color: var(--cat-cmp); }
.instr-card.cat-uncond  .instr-mnem { color: var(--cat-uncond); }
.instr-card.cat-cond    .instr-mnem { color: var(--cat-cond); }
.instr-card.cat-sys     .instr-mnem { color: var(--cat-sys); }

.instr-aliases {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.instr-summary {
  font-size: 0.92rem;
  color: var(--text);
}

.instr-syntax {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  background: #0b0d12;
  padding: 5px 8px;
  border-radius: 4px;
  border-left: 2px solid var(--border);
}

.instr-flags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.72rem;
  margin-top: 2px;
}
.flags-group {
  display: flex;
  align-items: center;
  gap: 4px;
}
.flags-group-label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.flag-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--mono);
  font-weight: 700;
  cursor: help;
  position: relative;
  user-select: none;
  font-size: 0.78rem;
  transition: transform 0.12s, box-shadow 0.12s;
}
.flag-badge.read {
  background: rgba(110, 168, 255, 0.18);
  color: var(--flag-read);
  border: 1px solid rgba(110, 168, 255, 0.35);
}
.flag-badge.set {
  background: rgba(251, 146, 60, 0.18);
  color: var(--flag-set);
  border: 1px solid rgba(251, 146, 60, 0.35);
}
.flag-badge:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}
.flag-badge .flag-tooltip {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 240px;
  max-width: 320px;
  padding: 10px 12px;
  background: #0b0d12;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--text);
  font-family: -apple-system, system-ui, sans-serif;
  font-weight: 400;
  font-size: 0.82rem;
  line-height: 1.45;
  text-align: left;
  z-index: 100;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.12s;
}
.flag-badge:hover .flag-tooltip,
.flag-badge:focus .flag-tooltip { opacity: 1; }
.flag-badge .flag-tooltip strong {
  display: block;
  color: var(--cat-flags);
  font-weight: 700;
  margin-bottom: 3px;
}
.flag-badge .flag-none {
  font-style: italic;
  color: var(--muted);
}

.instr-note {
  font-size: 0.84rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 8px;
  line-height: 1.5;
}
.instr-note strong { color: var(--text); font-weight: 600; }

/* When a card has no flags, show a small "no flags" label instead */
.no-flags {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  font-style: italic;
}

/* ---------- Footer ---------- */
footer {
  text-align: center;
  padding: 30px 20px 60px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}
footer p { max-width: 820px; margin: 0 auto 10px; }
footer .back-link { font-family: var(--mono); }