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

:root {
  --color-primary: #2563eb;
  --color-text: #111;
  --color-text-2: #444;
  --color-text-3: #888;
  --color-bg: #fff;
  --color-surface: #f8f8f8;
  --color-border: #e5e5e5;
  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: 'Menlo', 'Monaco', monospace;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 15px;
  line-height: 1.6;
}

nav {
  padding: 16px 40px;
  border-bottom: 1px solid var(--color-border);
}

nav a {
  color: var(--color-text-2);
  text-decoration: none;
  font-size: 14px;
}

nav a:hover { color: var(--color-primary); }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 40px 80px;
}

.page-header {
  margin-bottom: 36px;
}

.page-header h1 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 8px;
}

.page-desc {
  color: var(--color-text-2);
  font-size: 15px;
}

/* ── Explorer layout ── */

.explorer {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  min-height: 420px;
}

/* ── Tree panel ── */

.tree-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 0;
  overflow-y: auto;
}

.tree-header {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-3);
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--color-border);
}

.tree {
  list-style: none;
  padding: 8px 0;
}

.subtree {
  list-style: none;
  padding: 0;
}

.tree-item,
.tree-folder {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-text-2);
  padding: 6px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  border-radius: 0;
  transition: background 0.12s, color 0.12s;
  user-select: none;
}

.tree-item:hover,
.tree-folder:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.tree-item.active {
  background: #dbeafe;
  color: var(--color-primary);
}

.tree-folder {
  flex-wrap: wrap;
}

.tree-folder > ul {
  flex-basis: 100%;
  padding-left: 22px;
}

.tree-folder.collapsed > ul {
  display: none;
}

/* ── Icons ── */

.icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  border-radius: 2px;
  display: inline-block;
}

.file-html { background: #f97316; }
.file-css  { background: #3b82f6; }
.file-js   { background: #eab308; }

.folder {
  background: transparent;
  border: 2px solid var(--color-text-3);
}

.folder.open {
  border-color: var(--color-primary);
  background: #dbeafe;
}

/* ── Detail panel ── */

.detail-panel {
  padding: 28px 28px;
  display: flex;
  flex-direction: column;
}

.detail-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-3);
  font-size: 14px;
}

.detail-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.detail-badge {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 4px;
  background: #dbeafe;
  color: var(--color-primary);
}

.detail-badge[data-type="html"] { background: #ffedd5; color: #c2410c; }
.detail-badge[data-type="css"]  { background: #dbeafe; color: #1d4ed8; }
.detail-badge[data-type="js"]   { background: #fef9c3; color: #92400e; }
.detail-badge[data-type="folder"] { background: #f0fdf4; color: #166534; }

.detail-filename {
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-mono);
}

.detail-desc {
  font-size: 14px;
  color: var(--color-text-2);
  margin-bottom: 16px;
  line-height: 1.6;
}

.detail-code {
  background: #1e1e1e;
  color: #d4d4d4;
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  overflow-x: auto;
  white-space: pre;
  flex: 1;
}

/* ── Tokens section ── */

.tokens-section {
  margin-top: 40px;
}

.tokens-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.tokens-subtitle {
  font-size: 14px;
  color: var(--color-text-2);
  margin-bottom: 20px;
}

.tokens-subtitle code {
  font-family: var(--font-mono);
  background: var(--color-surface);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  font-size: 12.5px;
}

.tokens-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 10px;
}

.token-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 14px;
}

.token-swatch {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  flex-shrink: 0;
}

.token-swatch--font,
.token-swatch--mono {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  background: var(--color-border);
  color: var(--color-text-2);
}

.token-swatch--mono {
  font-family: var(--font-mono);
}

.token-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.token-name {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-primary);
}

.token-value {
  font-size: 12px;
  color: var(--color-text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Mobile ── */

@media (max-width: 640px) {
  main { padding: 24px 20px 60px; }
  nav { padding: 14px 20px; }

  .explorer {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .tree-panel {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

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