:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-2: #f1f3f6;
  --text: #1a1d23;
  --muted: #5c6470;
  --border: #e2e6ec;
  --accent: #2f6df6;
  --accent-ink: #ffffff;
  /* Solid accent for filled controls (primary button): dark enough that white text clears
     4.5:1 in BOTH themes, so it does NOT track --accent (which lightens on dark bg for links). */
  --accent-solid: #2f6df6;
  /* Error text — theme-aware so it clears 4.5:1 on each background. */
  --error: #c0392b;
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
/* Dark values, shared by system-dark (when no explicit choice) and explicit dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #14161a;
    --panel: #1c1f25;
    --panel-2: #23272e;
    --text: #e7eaef;
    --muted: #9aa3b0;
    --border: #2c313a;
    --accent: #5b8dff;
    --error: #e06c6c;
  }
}
:root[data-theme="dark"] {
  --bg: #14161a;
  --panel: #1c1f25;
  --panel-2: #23272e;
  --text: #e7eaef;
  --muted: #9aa3b0;
  --border: #2c313a;
  --accent: #5b8dff;
  --error: #e06c6c;
}
/* Explicit light needs no block: with [data-theme="light"] set, the system-dark media
   query (scoped to :not([data-theme])) doesn't match, so the :root light defaults apply. */

* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 16px;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 60px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.brand span {
  color: var(--accent);
}
.site-header nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.95rem;
}
.site-header nav a {
  color: var(--muted);
}
.theme-toggle {
  font: inherit;
  font-size: 0.85rem;
  padding: 6px 12px;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  white-space: nowrap;
}
.theme-toggle:hover {
  border-color: var(--accent);
}
@media (max-width: 560px) {
  .site-header nav a:not(:last-child) {
    display: none;
  }
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  padding: 14px 0 0;
}
.breadcrumb a {
  color: var(--muted);
}

/* Tool header */
h1 {
  font-size: 1.7rem;
  margin: 10px 0 6px;
  letter-spacing: -0.01em;
}
.lede {
  color: var(--muted);
  margin: 0 0 18px;
  max-width: 62ch;
}

/* Tool panel */
.tool {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 6px 0 8px;
}
@media (max-width: 760px) {
  .tool {
    grid-template-columns: 1fr;
  }
}
.io {
  display: flex;
  flex-direction: column;
}
.io > label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
textarea {
  width: 100%;
  min-height: 260px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.5;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
}
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.count {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 6px;
  min-height: 1.1em;
}
.count.error {
  color: var(--error);
}

/* Options + actions */
.options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin: 4px 0 16px;
}
.options:empty {
  display: none;
}
.opt {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}
.opt label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.opt select,
.opt input[type="text"] {
  font: inherit;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
}
.opt input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 26px;
}
button {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 16px;
  background: var(--panel);
  color: var(--text);
}
button.primary {
  background: var(--accent-solid);
  color: var(--accent-ink);
  border-color: var(--accent-solid);
}
button:hover {
  filter: brightness(1.05);
}
button:active {
  transform: translateY(1px);
}
.toast {
  font-size: 0.85rem;
  color: var(--accent);
  align-self: center;
  opacity: 0;
  transition: opacity 0.2s;
}
.toast.show {
  opacity: 1;
}

/* Content sections */
.content {
  max-width: 68ch;
  margin: 8px 0 40px;
}
.content h2 {
  font-size: 1.2rem;
  margin: 30px 0 10px;
}
.content ol,
.content ul {
  padding-left: 22px;
}
.content li {
  margin: 5px 0;
}
details {
  border-top: 1px solid var(--border);
  padding: 12px 0;
}
details summary {
  cursor: pointer;
  font-weight: 600;
}
details p {
  color: var(--muted);
  margin: 8px 0 0;
}

/* Ad slots — reserve space so real units don't shift the layout when they load. */
.ad-slot {
  margin: 18px 0;
  min-height: 90px;
  overflow: hidden;
}
.ad-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Legal / content pages */
.legal .updated {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 18px;
}
.legal h2 {
  font-size: 1.15rem;
}
.legal p {
  color: var(--text);
}

/* Tool grid (home + related) */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.card {
  display: block;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
}
.card:hover {
  text-decoration: none;
  border-color: var(--accent);
}
.card b {
  display: block;
  margin-bottom: 4px;
}
.card small {
  color: var(--muted);
}
.cat-title {
  font-size: 1.1rem;
  margin: 30px 0 12px;
}
.cat-title a {
  color: inherit;
}
.cat-title a:hover {
  color: var(--accent);
}
.related {
  margin: 10px 0 40px;
}
.related h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

/* Home hero */
.hero {
  padding: 40px 0 10px;
}
.hero h1 {
  font-size: 2.1rem;
}
.hero p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 60ch;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 26px 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
}