:root {
  --viewer-bg: #111318;
  --viewer-panel: #1a1d24;
  --viewer-ink: #e6e9ef;
  --viewer-muted: #9ea7b8;
  --viewer-border: #303643;
  --viewer-accent: #8bd5ff;
  --viewer-keyword: #ff9e64;
  --viewer-string: #a6e3a1;
  --viewer-number: #f9e2af;
  --viewer-comment: #727b8f;
  --viewer-function: #cba6f7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--viewer-bg);
  color: var(--viewer-ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.code-viewer-shell {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.code-viewer-back,
.code-viewer-actions a,
.code-viewer-actions button {
  border: 1px solid var(--viewer-border);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  background: var(--viewer-panel);
  color: var(--viewer-accent);
  font: inherit;
  font-size: 0.86rem;
  text-decoration: none;
}

.code-viewer-actions button { cursor: pointer; }

.code-viewer-back:hover,
.code-viewer-back:focus-visible,
.code-viewer-actions a:hover,
.code-viewer-actions a:focus-visible,
.code-viewer-actions button:hover,
.code-viewer-actions button:focus-visible {
  border-color: var(--viewer-accent);
  outline: none;
}

.code-viewer-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin: 1.5rem 0 0.75rem;
}

.code-viewer-kicker {
  margin: 0 0 0.45rem;
  color: var(--viewer-muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-viewer-head h1 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.2;
}

.code-viewer-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.code-viewer-status { min-height: 1.25rem; color: var(--viewer-muted); font-size: 0.86rem; }

.code-viewer-code {
  overflow: auto;
  margin: 0;
  padding: 1rem 0;
  border: 1px solid var(--viewer-border);
  border-radius: 12px;
  background: var(--viewer-panel);
  font-size: 1rem;
  line-height: 1.65;
  tab-size: 2;
}

.code-line {
  display: block;
  min-width: max-content;
  padding: 0 1.2rem 0 4.5rem;
  position: relative;
  white-space: pre;
}

.code-line::before {
  content: counter(line);
  counter-increment: line;
  position: absolute;
  right: calc(100% - 3.35rem);
  width: 2.4rem;
  color: var(--viewer-comment);
  text-align: right;
  user-select: none;
}

#code-lines { counter-reset: line; }
.token-keyword { color: var(--viewer-keyword); }
.token-string { color: var(--viewer-string); }
.token-number { color: var(--viewer-number); }
.token-comment { color: var(--viewer-comment); font-style: italic; }
.token-function { color: var(--viewer-function); }

@media (max-width: 640px) {
  .code-viewer-shell { width: min(100% - 1rem, 1200px); padding-top: 1rem; }
  .code-viewer-head { align-items: start; flex-direction: column; }
  .code-viewer-code { font-size: 0.92rem; }
}