:root {
  color-scheme: light;

  --bg0: #ffffff;
  --bg1: #ffffff;
  --panel: #ffffff;
  --panel-rgb: 255 255 255;
  --ink: #121212;
  --ink-rgb: 18 18 18;
  --muted: rgba(18, 18, 18, 0.66);
  --faint: rgba(18, 18, 18, 0.08);
  --line: rgba(18, 18, 18, 0.16);
  --shadow: rgba(18, 18, 18, 0.12);

  --accent: #b14a33;
  --accent2: #0e3a53;
  --accent-rgb: 177 74 51;
  --accent2-rgb: 14 58 83;

  --dot-rgb: 18 18 18;

  --radius-xl: 22px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 12px;

  --font-body: "Instrument Sans", "Segoe UI", sans-serif;
  --font-display: "Fraunces", ui-serif, Georgia, serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;

  --maxw: 1120px;
}

body.dark {
  color-scheme: dark;

  --bg0: #0b0b0b;
  --bg1: #0b0b0b;
  --panel: #141414;
  --panel-rgb: 20 20 20;
  --ink: #f3f3f3;
  --ink-rgb: 243 243 243;
  --muted: rgba(243, 243, 243, 0.68);
  --faint: rgba(243, 243, 243, 0.08);
  --line: rgba(243, 243, 243, 0.18);
  --shadow: rgba(0, 0, 0, 0.50);

  --accent: #e0a04f;
  --accent2: #66bfb1;
  --accent-rgb: 224 160 79;
  --accent2-rgb: 102 191 177;

  --dot-rgb: 245 245 245;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  line-height: 1.45;
  background-color: var(--bg0);
}

a {
  color: inherit;
}

code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  background: rgb(var(--panel-rgb) / 0.96);
  border: 1px solid var(--line);
  padding: 2px 6px;
  border-radius: 8px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 34px 20px 72px;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  padding: 6px 0 18px;
  border-bottom: 1px solid var(--faint);
  animation: fadeUp 680ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.brand {
  min-width: 260px;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand h1 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 580;
  font-size: clamp(38px, 5.5vw, 64px);
  letter-spacing: -0.02em;
  line-height: 1.02;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  max-width: 56ch;
}

.top-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
  margin-left: auto;
  align-self: flex-start;
}

.top-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.top-prefs {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.layout {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.controls {
  background: rgb(var(--panel-rgb) / 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 14px;
  box-shadow: 0 22px 70px var(--shadow), 0 1px 0 var(--faint);
  backdrop-filter: blur(10px);
  animation: fadeUp 720ms cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 80ms;
}

.search-wrap {
  position: relative;
}

.search-kbd {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.88;
  pointer-events: none;
}

.search-wrap:focus-within .search-kbd {
  opacity: 0.25;
}

.search-kbd .kbd {
  opacity: 0.9;
}

#search {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgb(var(--panel-rgb) / 0.98);
  color: var(--ink);
  padding: 13px 54px 13px 14px;
  font-size: 16px;
  letter-spacing: 0.01em;
  box-shadow: inset 0 1px 0 var(--faint);
}

#search::placeholder {
  color: rgb(var(--ink-rgb) / 0.46);
}

#search:focus {
  outline: none;
  border-color: rgb(var(--accent-rgb) / 0.65);
  box-shadow:
    inset 0 1px 0 var(--faint),
    0 0 0 4px rgb(var(--accent-rgb) / 0.16);
}

.meta {
  margin-top: 10px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--muted);
}

.shortcuts {
  margin-top: 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--muted);
  line-height: 1.35;
}

.map-panel {
  position: relative;
  margin-top: 14px;
  border: 1px solid rgb(var(--ink-rgb) / 0.16);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgb(var(--panel-rgb) / 0.99), rgb(var(--panel-rgb) / 0.92));
  padding: 12px;
  box-shadow:
    inset 0 1px 0 rgb(var(--ink-rgb) / 0.05),
    0 18px 56px var(--shadow);
  overflow: hidden;
}

.map-panel::before {
  content: "";
  position: absolute;
  inset: -24% -14% auto;
  height: 120%;
  pointer-events: none;
  background:
    radial-gradient(56% 48% at 10% 8%, rgb(var(--accent-rgb) / 0.18), transparent 72%),
    radial-gradient(52% 50% at 94% 12%, rgb(var(--accent2-rgb) / 0.15), transparent 76%);
  opacity: 0.86;
}

body.dark .map-panel::before {
  opacity: 1;
}

.map-panel > * {
  position: relative;
  z-index: 1;
}

.map-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.map-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.map-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.map-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgb(var(--ink-rgb) / 0.82);
  border: 1px solid rgb(var(--ink-rgb) / 0.16);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgb(var(--panel-rgb) / 0.88);
  box-shadow: inset 0 1px 0 rgb(var(--ink-rgb) / 0.04);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 40ch;
}

.term-map {
  display: block;
  width: 100%;
  height: 300px;
  margin-top: 10px;
  border-radius: var(--radius-md);
  border: 1px solid rgb(var(--ink-rgb) / 0.16);
  background:
    radial-gradient(110% 92% at 0% 0%, rgb(var(--accent-rgb) / 0.12), transparent 58%),
    radial-gradient(110% 90% at 100% 100%, rgb(var(--accent2-rgb) / 0.10), transparent 56%),
    radial-gradient(circle at 1px 1px, rgb(var(--dot-rgb) / 0.07) 1.2px, transparent 1.21px),
    linear-gradient(180deg, rgb(var(--panel-rgb) / 0.95), rgb(var(--panel-rgb) / 0.90));
  background-size: auto, auto, 22px 22px, auto;
  box-shadow:
    inset 0 1px 0 rgb(var(--ink-rgb) / 0.06),
    inset 0 -18px 34px rgb(var(--ink-rgb) / 0.06);
  animation: mapIn 760ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.map-hint {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgb(var(--ink-rgb) / 0.72);
}

.map-details {
  margin-top: 10px;
  border-radius: var(--radius-md);
  background: rgb(var(--panel-rgb) / 0.90);
}

.map-details summary {
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 12px;
}

.map-details-copy {
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.5;
  color: rgb(var(--ink-rgb) / 0.86);
}

.map-details-copy p {
  margin: 0 0 10px;
}

.map-details-copy p:last-child {
  margin-bottom: 0;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgb(var(--panel-rgb) / 0.96);
  box-shadow: inset 0 1px 0 var(--faint);
}

.lang-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  padding: 8px 10px;
  border-radius: 999px;
  cursor: pointer;
}

.lang-btn:hover {
  color: var(--ink);
}

.lang-btn.active {
  background:
    linear-gradient(180deg, rgb(var(--accent-rgb) / 0.14), rgb(var(--panel-rgb) / 0.96));
  color: var(--ink);
  box-shadow: 0 16px 40px var(--shadow);
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.controls .actions {
  margin-top: 10px;
}

.ghost {
  border: 1px solid var(--line);
  background: rgb(var(--panel-rgb) / 0.92);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 var(--faint);
}

.icon-toggle {
  width: 38px;
  height: 38px;
  padding: 0;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0;
  text-transform: none;
}

.ghost:hover {
  border-color: rgb(var(--accent-rgb) / 0.45);
  background: rgb(var(--panel-rgb) / 0.98);
}

.ghost:active {
  transform: translateY(1px);
}

:is(button, a, input, summary):focus-visible {
  outline: 2px solid rgb(var(--accent-rgb) / 0.55);
  outline-offset: 3px;
}

.content {
  min-width: 0;
}

.results {
  display: grid;
  gap: 14px;
}

.intro {
}

.intro-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 560;
  font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing: -0.01em;
  line-height: 1.08;
}

.intro-lede {
  margin: 10px 0 0;
  color: rgb(var(--ink-rgb) / 0.84);
  max-width: 70ch;
}

.intro-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.intro-block {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 12px 12px;
  background: rgb(var(--panel-rgb) / 0.96);
}

.intro-block h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.intro-block p {
  margin: 8px 0 0;
  color: rgb(var(--ink-rgb) / 0.82);
}

.intro-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.intro-footer {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--faint);
  display: grid;
  gap: 12px;
}

.chips {
  margin-top: 8px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--line);
  background: rgb(var(--panel-rgb) / 0.96);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 7px 10px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 var(--faint);
}

.chip:hover {
  border-color: rgb(var(--accent-rgb) / 0.50);
}

.intro-hint {
  margin: 12px 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgb(var(--panel-rgb) / 0.96);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.1;
}

@keyframes cardIn {
  from {
    opacity: 0;
    transform: translateY(10px);
    filter: blur(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
    filter: blur(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes mapIn {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.994);
    filter: blur(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.card {
  position: relative;
  --glow-a: rgb(var(--accent-rgb) / 0.14);
  --glow-b: rgb(var(--accent2-rgb) / 0.12);
  --edge: rgb(var(--accent-rgb) / 0.55);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgb(var(--panel-rgb) / 0.98), rgb(var(--panel-rgb) / 0.94));
  border-radius: var(--radius-xl);
  padding: 18px 18px 18px 28px;
  box-shadow: 0 22px 80px var(--shadow), 0 1px 0 var(--faint);
  overflow: hidden;
  animation: cardIn 560ms cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: calc(var(--stagger, 0) * 36ms);
}

.card[data-difficulty="beginner"] {
  --glow-a: rgb(var(--accent2-rgb) / 0.14);
  --glow-b: rgb(var(--accent-rgb) / 0.08);
  --edge: rgb(var(--accent2-rgb) / 0.55);
}

.card[data-difficulty="intermediate"] {
  --glow-a: rgb(var(--accent-rgb) / 0.14);
  --glow-b: rgb(var(--accent2-rgb) / 0.10);
  --edge: rgb(var(--accent-rgb) / 0.55);
}

.card[data-difficulty="advanced"] {
  --glow-a: rgb(var(--accent-rgb) / 0.18);
  --glow-b: rgb(var(--accent2-rgb) / 0.10);
  --edge: rgb(var(--accent-rgb) / 0.72);
}

.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  background:
    radial-gradient(780px 220px at 0% 0%, var(--glow-a), transparent 62%),
    radial-gradient(680px 240px at 100% 0%, var(--glow-b), transparent 58%);
  opacity: 0.75;
}

.card::after {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 12px;
  width: 3px;
  border-radius: 999px;
  pointer-events: none;
  background: linear-gradient(180deg, var(--edge), transparent 85%);
  opacity: 0.9;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 30px 100px var(--shadow), 0 1px 0 var(--faint);
}

.card-head {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.term {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 560;
  font-size: 28px;
  letter-spacing: -0.01em;
  line-height: 1.06;
}

.difficulty {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgb(var(--panel-rgb) / 0.92);
  white-space: nowrap;
}

.card[data-difficulty="beginner"] .difficulty {
  border-color: rgb(var(--accent2-rgb) / 0.26);
}

.card[data-difficulty="intermediate"] .difficulty {
  border-color: rgb(var(--accent-rgb) / 0.22);
}

.card[data-difficulty="advanced"] .difficulty {
  border-color: rgb(var(--accent-rgb) / 0.32);
}

.tags {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  position: relative;
}

.tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px dashed var(--line);
  background: rgb(var(--panel-rgb) / 0.92);
}

.definition {
  margin: 12px 0 0;
  font-size: 15.5px;
  color: rgb(var(--ink-rgb) / 0.90);
  position: relative;
}

.details {
  margin: 12px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 10px 12px;
  background: rgb(var(--panel-rgb) / 0.92);
  position: relative;
}

.details summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.details summary::-webkit-details-marker {
  display: none;
}

.details summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--muted);
  transition: transform 180ms ease, color 180ms ease;
}

.details[open] summary::after {
  transform: rotate(45deg);
  color: var(--ink);
}

.key-intuition {
  margin: 10px 0 0;
  line-height: 1.5;
  white-space: pre-line;
  color: rgb(var(--ink-rgb) / 0.86);
}

.use-cases {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  position: relative;
}

.popularity {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 12.5px;
  position: relative;
}

.links,
.related {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  position: relative;
}

.link-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: rgb(var(--panel-rgb) / 0.92);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 7px 10px;
  border-radius: 999px;
  text-decoration: none;
  box-shadow: inset 0 1px 0 var(--faint);
}

.link-tag:hover {
  border-color: rgb(var(--accent-rgb) / 0.50);
}

.related button {
  border: 1px solid var(--line);
  background: rgb(var(--panel-rgb) / 0.92);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 7px 10px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 var(--faint);
}

.related button:hover {
  border-color: rgb(var(--accent-rgb) / 0.50);
}

.report {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  position: relative;
}

@media (min-width: 920px) {
  .layout {
    grid-template-columns: minmax(360px, 460px) 1fr;
    align-items: start;
    gap: 18px;
  }

  .controls {
    position: sticky;
    top: 18px;
  }

  .intro-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .app {
    padding: 26px 16px 64px;
  }

  .masthead {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-controls {
    width: 100%;
    justify-content: flex-end;
  }

  .term-map {
    height: 246px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .masthead,
  .controls {
    animation: none;
  }

  .card {
    animation: none;
  }

  .term-map {
    animation: none;
  }

  .ghost:active {
    transform: none;
  }
}