:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --surface: #11161d;
  --surface-2: #161d25;
  --surface-3: #1d2731;
  --text: #e7edf3;
  --muted: #9ba8b5;
  --faint: #70808f;
  --border: #2b3540;
  --accent: #6ee7b7;
  --accent-2: #7dd3fc;
  --shadow: rgba(0, 0, 0, 0.34);
  --misc: #8b9bb4;
  --jump: #f59e0b;
  --load8: #38bdf8;
  --load16: #60a5fa;
  --alu8: #fb7185;
  --alu16: #a78bfa;
  --bit: #34d399;
}

body.light {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #f0f3f7;
  --surface-3: #e6ebf1;
  --text: #18202a;
  --muted: #526170;
  --faint: #6b7a8a;
  --border: #d4dbe4;
  --accent: #057a55;
  --accent-2: #0369a1;
  --shadow: rgba(20, 30, 45, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
}

.topbar {
  align-items: center;
  display: flex;
  gap: 18px;
  min-height: 58px;
  padding: 0 22px;
}

.brand {
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  flex: 1;
  flex-wrap: wrap;
  gap: 14px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
}

.theme-toggle {
  align-items: center;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  gap: 7px;
  height: 36px;
  padding: 0 12px;
}

main {
  margin: 0 auto;
  max-width: 1720px;
  padding: 34px 22px 56px;
}

.intro {
  align-items: end;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  margin-bottom: 20px;
}

.eyebrow {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 8px;
  text-transform: uppercase;
}

h1,
h2 {
  letter-spacing: 0;
  line-height: 1.1;
  margin: 0;
}

h1 {
  font-size: clamp(30px, 5vw, 54px);
}

h2 {
  font-size: 22px;
}

.json-link {
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  padding: 8px 12px;
}

.legend-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}

.category {
  border: 1px solid color-mix(in srgb, currentColor 55%, var(--border));
  border-radius: 7px;
  color: var(--category-color);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 9px;
}

.misc { --category-color: var(--misc); }
.jump { --category-color: var(--jump); }
.load8 { --category-color: var(--load8); }
.load16 { --category-color: var(--load16); }
.alu8 { --category-color: var(--alu8); }
.alu16 { --category-color: var(--alu16); }
.bit { --category-color: var(--bit); }

.opcode-section {
  margin-top: 34px;
}

.section-title {
  align-items: baseline;
  display: flex;
  gap: 14px;
  margin-bottom: 12px;
}

.section-title p {
  color: var(--muted);
  margin: 0;
}

.table-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 18px 50px var(--shadow);
  overflow: visible;
}

.opcode-table {
  border-collapse: separate;
  border-spacing: 0;
  min-width: 1180px;
  table-layout: fixed;
  width: 100%;
}

.opcode-table th {
  background: var(--surface-3);
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  padding: 10px 8px;
  position: sticky;
  top: 0;
  text-align: left;
  z-index: 2;
}

.opcode-table th:first-child,
.opcode-table td:first-child {
  left: 0;
  position: sticky;
  width: 58px;
  z-index: 3;
}

.opcode-table th:first-child {
  z-index: 4;
}

.opcode-table td:first-child {
  background: var(--surface-3);
  color: var(--muted);
  font-weight: 800;
  text-align: center;
}

.opcode-table td,
.opcode-table th {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.opcode-table tr:last-child td {
  border-bottom: 0;
}

.opcode-table td:last-child,
.opcode-table th:last-child {
  border-right: 0;
}

.opcode-table td {
  background: var(--surface);
  min-width: 138px;
  padding: 0;
  vertical-align: top;
}

.instruction {
  border-left: 4px solid var(--category-color);
  display: grid;
  gap: 7px;
  min-height: 76px;
  padding: 9px 10px 10px;
}

.opcode {
  color: var(--faint);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.binary-opcode {
  white-space: nowrap;
}

.mnemonic {
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.meta {
  align-items: center;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  gap: 7px;
}

.meta-token {
  background: var(--surface-2);
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--text);
  display: inline-grid;
  min-height: 20px;
  min-width: 20px;
  padding: 1px 5px;
  place-items: center;
}

.flags {
  display: inline-flex;
  gap: 3px;
}

.meta-token,
.flag {
  position: relative;
}

.meta-token:focus,
.flag:focus {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

.meta-token:hover::after,
.meta-token:focus::after,
.flag:hover::after,
.flag:focus::after {
  background: #eef4fb;
  border: 1px solid #c7d2de;
  border-radius: 6px;
  bottom: calc(100% + 8px);
  box-shadow: 0 10px 24px var(--shadow);
  color: #14202b;
  content: attr(data-tooltip);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 12px;
  font-weight: 700;
  left: 50%;
  line-height: 1.25;
  max-width: 220px;
  min-width: 130px;
  padding: 7px 8px;
  pointer-events: none;
  position: absolute;
  text-align: center;
  transform: translateX(-50%);
  white-space: normal;
  z-index: 30;
}

.meta-token:hover::before,
.meta-token:focus::before,
.flag:hover::before,
.flag:focus::before {
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid #eef4fb;
  bottom: calc(100% + 2px);
  content: "";
  left: 50%;
  pointer-events: none;
  position: absolute;
  transform: translateX(-50%);
  z-index: 31;
}

.flag {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  display: inline-grid;
  height: 20px;
  min-width: 20px;
  place-items: center;
}

.empty {
  align-items: center;
  color: var(--faint);
  display: flex;
  font-size: 22px;
  justify-content: center;
  min-height: 76px;
}

.notes {
  border-top: 1px solid var(--border);
  margin-top: 38px;
  padding-top: 24px;
}

.notes dl {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin: 16px 0;
}

.notes dl div {
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  gap: 10px;
  padding: 9px 11px;
}

.notes dt {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
}

.notes dd,
.notes p {
  color: var(--muted);
  margin: 0;
}

@media (max-width: 760px) {
  .topbar,
  .intro,
  .section-title {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar {
    padding: 12px 16px;
  }

  main {
    padding: 26px 14px 44px;
  }

}