:root {
  color-scheme: light dark;
  --color-bg: #ffffff;
  --color-bg-elev: #f8fafc;
  --color-text: #1e293b;
  --color-muted: #64748b;
  --color-accent: #2563eb;
  --color-accent-soft: rgba(37, 99, 235, 0.08);
  --color-border: #e2e8f0;
  --color-code-bg: #f1f5f9;

  /* JSON token colors (light) */
  --tok-key: #0f766e;
  --tok-string: #b45309;
  --tok-number: #2563eb;
  --tok-bool: #9333ea;
  --tok-null: #64748b;
  --tok-punct: #475569;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-bg-elev: #111c34;
    --color-text: #e2e8f0;
    --color-muted: #94a3b8;
    --color-accent: #60a5fa;
    --color-accent-soft: rgba(96, 165, 250, 0.12);
    --color-border: #1e293b;
    --color-code-bg: #0b1424;

    --tok-key: #5eead4;
    --tok-string: #fbbf24;
    --tok-number: #93c5fd;
    --tok-bool: #c4b5fd;
    --tok-null: #94a3b8;
    --tok-punct: #94a3b8;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  text-decoration: underline;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

/* Header */
.site-header {
  background: var(--color-bg-elev);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.05rem;
}

.site-title:hover {
  text-decoration: none;
}

.site-title__mark {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border-radius: 0.35rem;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.site-nav {
  display: flex;
  gap: 1rem;
}

.site-nav a[aria-current="page"] {
  color: var(--color-text);
}

/* Layout */
.layout {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

/* Sidebar */
.sidebar {
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1rem;
  position: sticky;
  top: 1rem;
}

.sidebar__heading {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.file-list__status,
.file-list__empty,
.file-list__error {
  color: var(--color-muted);
  font-size: 0.9rem;
  padding: 0.5rem 0.25rem;
}

.file-list__error {
  color: #b91c1c;
}

.file-list a {
  display: block;
  padding: 0.55rem 0.7rem;
  border-radius: 0.4rem;
  color: var(--color-text);
  border: 1px solid transparent;
}

.file-list a:hover {
  background: var(--color-accent-soft);
  text-decoration: none;
}

.file-list a[aria-current="true"] {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.file-list__title {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
}

.file-list__path {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: 0.1rem;
}

/* Viewer */
.viewer {
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  min-height: 320px;
  display: flex;
  flex-direction: column;
}

.viewer__toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.viewer__title {
  margin: 0;
  font-size: 1.1rem;
}

.viewer__description {
  margin: 0.25rem 0 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}

.viewer__path {
  margin: 0.4rem 0 0;
  font-size: 0.85rem;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.viewer__path code {
  background: var(--color-code-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 0.3rem;
}

.viewer__actions {
  display: flex;
  gap: 0.5rem;
}

.viewer__actions button {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  border-radius: 0.35rem;
  cursor: pointer;
}

.viewer__actions button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.viewer__content {
  padding: 1rem 1.25rem 1.5rem;
  overflow-x: auto;
}

.viewer__placeholder {
  color: var(--color-muted);
  margin: 1rem 0;
}

.viewer__error {
  color: #b91c1c;
  margin: 1rem 0;
}

/* JSON tree */
.json-tree {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
}

.json-tree ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.4rem;
  border-left: 1px dashed var(--color-border);
}

.json-tree li {
  position: relative;
}

.json-tree .json-node--collapsible > .json-summary {
  cursor: pointer;
  user-select: none;
}

.json-toggle {
  display: inline-block;
  width: 1rem;
  color: var(--color-muted);
  text-align: center;
  margin-right: 0.15rem;
  font-size: 0.75rem;
}

.json-node--collapsed > ul,
.json-node--collapsed > .json-closing {
  display: none;
}

.json-node--collapsed > .json-summary .json-ellipsis {
  display: inline;
}

.json-node--collapsed > .json-summary .json-trail {
  display: inline;
}

.json-ellipsis,
.json-trail {
  display: none;
}

.json-ellipsis {
  color: var(--color-muted);
  padding: 0 0.25rem;
}

.json-count {
  color: var(--color-muted);
  font-style: italic;
  font-size: 0.85em;
  margin-left: 0.4rem;
}

.json-key {
  color: var(--tok-key);
}

.json-string {
  color: var(--tok-string);
  word-break: break-word;
}

.json-number {
  color: var(--tok-number);
}

.json-bool {
  color: var(--tok-bool);
}

.json-null {
  color: var(--tok-null);
  font-style: italic;
}

.json-punct {
  color: var(--tok-punct);
}

/* Prose pages (About) */
.prose {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1.25rem 2rem;
  line-height: 1.65;
}

.prose h1 {
  margin-top: 0;
}

.prose h2 {
  margin-top: 2rem;
}

.prose code {
  background: var(--color-code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 0.3rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}