:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #e0e0e0;
  --accent: #0066cc;
  --code-bg: #f0f0f0;
  --sidebar-bg: #f5f5f5;
  --max-w: 960px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --fg: #e0e0e0;
    --muted: #999;
    --border: #333;
    --accent: #4da6ff;
    --code-bg: #1a1a1a;
    --sidebar-bg: #161616;
  }
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  font-size: 16px;
}

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

code {
  font-family: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 0.6em 1em;
  border-radius: 4px;
  overflow-x: auto;
  margin: 0.35em 0;
  position: relative;
}

pre code { background: none; padding: 0; font-size: 0.85em; }

.code-box {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 0.4em;
  right: 0.4em;
  background: var(--border);
  border: none;
  border-radius: 3px;
  color: var(--muted);
  cursor: pointer;
  padding: 0.2em 0.45em;
  font-size: 0.75em;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s;
}

.code-box:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--fg); }
.copy-btn.copied { color: var(--accent); }

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75em 1.5em;
  border-bottom: 1px solid var(--border);
  max-width: var(--max-w);
  margin: 0 auto;
}

.site-logo {
  font-size: 1.25em;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}

.site-logo span { color: var(--accent); }
.site-logo:hover { text-decoration: none; }

.site-header nav a {
  font-size: 0.85em;
  color: var(--muted);
}

.breadcrumb span {
  font-size: 0.85em;
  color: var(--muted);
}

.breadcrumb span:last-child {
  color: var(--fg);
  font-weight: 600;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2em 1em;
  color: var(--muted);
  font-size: 0.8em;
  border-top: 1px solid var(--border);
  max-width: var(--max-w);
  margin: 0 auto;
}

/* Page layout */
.page-layout {
  display: flex;
  gap: 2em;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5em;
  align-items: flex-start;
}

main { flex: 1; min-width: 0; }

/* Right tools sidebar */
.tools-sidebar {
  position: sticky;
  top: 1em;
  width: 160px;
  flex-shrink: 0;
  padding-top: 1.5em;
}

.tools-sidebar details { background: var(--sidebar-bg); border-radius: 4px; }

.tools-sidebar summary {
  cursor: pointer;
  padding: 0.5em 0.75em;
  font-size: 0.8em;
  list-style: none;
}

.tools-sidebar summary::-webkit-details-marker { display: none; }
.tools-sidebar summary::marker { display: none; content: ""; }

.tools-sidebar ul { list-style: none; padding: 0 0 0.5em; }

.tools-sidebar li a {
  display: block;
  padding: 0.15em 0.75em;
  font-size: 0.78em;
  color: var(--fg);
  border-left: 2px solid transparent;
  transition: border-color 0.15s;
}

.tools-sidebar li a:hover {
  border-left-color: var(--accent);
  text-decoration: none;
  color: var(--accent);
}

.tools-sidebar li a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* Homepage */
.home-intro {
  padding: 2em 0 1em;
}

.home-intro h1 {
  font-size: 1.5em;
  margin-bottom: 0.25em;
}

.home-intro p {
  color: var(--muted);
  font-size: 0.95em;
}

.search-box {
  display: block;
  width: 100%;
  max-width: 400px;
  margin-top: 0.75em;
  padding: 0.5em 0.75em;
  font-size: 0.95em;
  font-family: inherit;
  background: var(--code-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
}

.search-box:focus { border-color: var(--accent); }

.category-label {
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 1.5em 0 0.25em;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--border);
}

.tool-category:first-of-type .category-label { margin-top: 0.75em; }

.tool-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5em;
  padding: 0.5em 0 1em;
}

.tool-list a {
  display: block;
  padding: 0.75em 1em;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--fg);
  transition: border-color 0.15s;
}

.tool-list a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.tool-list .tool-name {
  font-weight: 600;
  font-size: 1.05em;
}

.tool-list .tool-desc {
  color: var(--muted);
  font-size: 0.8em;
  margin-top: 0.15em;
}

/* Tool page layout */
.tool-page {
  display: flex;
  gap: 2em;
  padding: 1.5em 0 3em;
  align-items: flex-start;
}

.sidebar {
  position: sticky;
  top: 1em;
  width: 220px;
  flex-shrink: 0;
}

.sidebar details { background: var(--sidebar-bg); border-radius: 4px; }

.sidebar summary {
  cursor: pointer;
  padding: 0.75em 1em;
  font-size: 0.9em;
  list-style: none;
}

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

.sidebar ul { list-style: none; padding: 0 0 0.5em; }

.sidebar li a {
  display: block;
  padding: 0.25em 1em;
  font-size: 0.8em;
  color: var(--fg);
  border-left: 2px solid transparent;
  transition: border-color 0.15s;
}

.sidebar li a:hover {
  border-left-color: var(--accent);
  text-decoration: none;
  color: var(--accent);
}

.sidebar li a code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* Tool content */
.tool-content { flex: 1; min-width: 0; }

.tool-content h1 {
  font-size: 1.4em;
  margin-bottom: 1em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--border);
}

.tool-content .subtitle {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.7em;
}

.tool-content h2 {
  font-size: 1.1em;
  margin: 1.75em 0 0.5em;
  padding-top: 0.75em;
  border-top: 1px solid var(--border);
  scroll-margin-top: 1em;
}

.tool-content h2:first-of-type {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

.tool-content p {
  margin: 0.4em 0;
  font-size: 0.95em;
}

.tool-content h2 code {
  font-size: 1em;
  background: none;
  padding: 0;
}

/* Mobile */
@media (max-width: 700px) {
  .page-layout {
    flex-direction: column;
  }

  .tools-sidebar {
    position: static;
    width: 100%;
    padding-top: 0;
    order: -1;
  }

  .tools-sidebar details { }
  .tools-sidebar details:not([open]) { border-bottom: 1px solid var(--border); }

  .tool-page {
    flex-direction: column;
    gap: 1em;
  }

  .sidebar {
    position: static;
    width: 100%;
  }

  .sidebar details:not([open]) { border-bottom: 1px solid var(--border); }
}