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

:root {
  /* These are overridden by JS – fallbacks only */
  --aalto-definition: #6B7FD4;
  --aalto-constant: #B87333;
  --aalto-string: #7D8F6E;
  --aalto-comment: #706873;
  --aalto-fg: #EAE1D8;
  --aalto-bg: #18122E;

  /* Surfaces derived from bg (dark) */
  --aalto-bg-light: #221C3A;
  --aalto-selection: #2A2345;
  --aalto-cursorline: #1D1733;

  --transition-speed: 0.2s;
}

/* Light mode overrides – now unused; kept for completeness */
[data-theme="light"] {
  --aalto-definition: #5C63C0;
  --aalto-constant: #8A5A3C;
  --aalto-string: #61784F;
  --aalto-comment: #9A948C;
  --aalto-fg: #2B2740;
  --aalto-bg: #F2EDE6;

  --aalto-bg-light: #E6DFD4;
  --aalto-selection: #DDD4C6;
  --aalto-cursorline: #EDE7DD;
}

body {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  background: var(--aalto-bg);
  color: var(--aalto-fg);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  line-height: 1.5;
}

.app {
  max-width: 1400px;
  width: 95%;
  margin: 2rem auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

header {
  text-align: center;
}

h1 {
  font-size: 3rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--aalto-comment);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.variant-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.switch {
  position: relative;
  display: inline-block;
  width: 56px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--aalto-bg-light);
  border: 1px solid var(--aalto-cursorline);
  transition: 0.2s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background-color: var(--aalto-fg);
  transition: 0.2s;
  border-radius: 50%;
}

input:checked + .slider:before {
  transform: translateX(28px);
}

main {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
}

.code-panel {
  background: var(--aalto-bg-light);
  border-radius: 16px;
  padding: 1.5rem;
  border: 1px solid var(--aalto-selection);
  overflow-x: auto;
  transition: background-color var(--transition-speed);
}

.code-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
}

#language-select {
  background: var(--aalto-selection);
  color: var(--aalto-fg);
  border: 1px solid var(--aalto-comment);
  padding: 0.5rem 2rem 0.5rem 1rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23EAE1D8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 16px;
}

pre {
  margin: 0;
}

code {
  font-size: 0.95rem;
  line-height: 1.7;
  font-family: inherit;
  background: transparent !important;
}

/* Prism token styling – maps directly to semantic roles */
.token.keyword,
.token.operator,
.token.punctuation,
.token.attr-name,
.token.script,
.token.tag {
  color: var(--aalto-fg) !important;
}

.token.function,
.token.class-name,
.token.maybe-class-name,
.token.builtin,
.token.type,
.token.namespace {
  color: var(--aalto-definition) !important;
}

.token.string,
.token.char,
.token.attr-value,
.token.regex {
  color: var(--aalto-string) !important;
}

.token.number,
.token.boolean,
.token.constant,
.token.symbol,
.token.unit {
  color: var(--aalto-constant) !important;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(--aalto-comment) !important;
  font-style: italic;
}

.palette-panel {
  background: var(--aalto-bg-light);
  border-radius: 16px;
  padding: 1.5rem;
  border: 1px solid var(--aalto-cursorline);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.palette-panel h2 {
  font-size: 1.4rem;
  font-weight: 500;
}

.palette-grid {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.palette-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px dotted var(--aalto-selection);
}

.palette-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-swatch {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 1px solid var(--aalto-comment);
}

.palette-value {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: monospace;
  font-size: 0.95rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  transition: background 0.15s;
}

.palette-value:hover {
  background: var(--aalto-selection);
}

.copy-icon {
  opacity: 0.6;
  font-size: 0.9rem;
}

.hint {
  font-size: 0.8rem;
  color: var(--aalto-comment);
  text-align: center;
}

footer {
  text-align: center;
  padding-top: 1rem;
}

footer a {
  color: var(--aalto-definition);
  text-decoration: none;
  font-size: 0.9rem;
}

footer a:hover {
  text-decoration: underline;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--aalto-definition);
  color: var(--aalto-bg);
  padding: 0.75rem 1.5rem;
  border-radius: 40px;
  font-weight: 500;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  pointer-events: none;
}

@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
  }
  h1 { font-size: 2.2rem; }
  .app { width: 98%; margin: 1rem auto; }
}