:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --border: #d0d7de;
  --border-muted: #e4e8ec;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --success: #1a7f37;
  --danger: #cf222e;
  --code-bg: #f3f4f6;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --card: #161b22;
    --border: #30363d;
    --border-muted: #21262d;
    --text: #e6edf3;
    --muted: #8b949e;
    --accent: #7c7ff0;
    --accent-hover: #9898f5;
    --accent-soft: #1e1e3a;
    --success: #3fb950;
    --danger: #f85149;
    --code-bg: #1f242c;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}
.brand-mark {
  width: 28px; height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
}
nav ul {
  list-style: none;
  padding: 0; margin: 0;
  display: flex;
  gap: 22px;
}
nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}
nav a:hover, nav a.active {
  color: var(--text);
  text-decoration: none;
}
nav a.active { color: var(--accent); }

/* ---------- Page wrapper ---------- */
main { padding: 40px 0 80px; }
.page-title { font-size: 28px; margin: 0 0 6px; }
.page-subtitle { color: var(--muted); margin: 0 0 28px; font-size: 15px; }
.breadcrumb { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.breadcrumb a { color: var(--muted); }

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card + .card { margin-top: 20px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  font-family: inherit;
}
.btn:hover { border-color: var(--muted); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Form controls ---------- */
textarea, input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  transition: border-color .15s, box-shadow .15s;
}
textarea {
  font-family: var(--mono);
  resize: vertical;
  min-height: 160px;
}
textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}
.checkbox input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

/* ---------- Tabs ---------- */
.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
}
.tab {
  padding: 6px 14px;
  background: transparent;
  border: none;
  border-radius: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
}
.tab.active { background: var(--card); color: var(--accent); box-shadow: 0 1px 2px rgba(0,0,0,.06); }

/* ---------- Split layout ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 720px) {
  .split { grid-template-columns: 1fr; }
}

/* ---------- Landing grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 28px;
}
.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  color: inherit;
  transition: border-color .15s, transform .15s;
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.tool-card .icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
}
.tool-card h3 { margin: 0 0 6px; font-size: 16px; }
.tool-card p { margin: 0; color: var(--muted); font-size: 13px; }

/* ---------- Output / mono ---------- */
.mono { font-family: var(--mono); font-size: 13px; }
.output {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 60px;
}
.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.pill-good { background: rgba(26,127,55,.12); color: var(--success); }
.pill-warn { background: rgba(234,179,8,.15); color: #b45309; }
.pill-bad  { background: rgba(207,34,46,.12); color: var(--danger); }

/* ---------- Utility ---------- */
.row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.row > * { margin: 0; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.muted { color: var(--muted); }
.hr { border: 0; border-top: 1px solid var(--border-muted); margin: 24px 0; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 40px;
  color: var(--muted);
  font-size: 13px;
}
footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- FAQ / content sections ---------- */
.content h2 { font-size: 20px; margin-top: 32px; margin-bottom: 10px; }
.content h3 { font-size: 16px; margin-top: 20px; margin-bottom: 6px; }
.content p  { color: var(--text); }
.content ul { padding-left: 22px; }
.content code { font-family: var(--mono); background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: 13px; }

/* ---------- Markdown preview styles ---------- */
.md-preview { font-size: 14px; }
.md-preview h1 { font-size: 22px; margin-top: 0; padding-bottom: 8px; border-bottom: 1px solid var(--border-muted); }
.md-preview h2 { font-size: 18px; padding-bottom: 6px; border-bottom: 1px solid var(--border-muted); }
.md-preview h3 { font-size: 16px; }
.md-preview pre {
  background: var(--code-bg);
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
}
.md-preview code { font-family: var(--mono); background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: 13px; }
.md-preview pre code { padding: 0; background: transparent; }
.md-preview blockquote {
  border-left: 3px solid var(--border);
  padding-left: 14px;
  color: var(--muted);
  margin: 12px 0;
}
.md-preview table { border-collapse: collapse; margin: 12px 0; }
.md-preview th, .md-preview td { border: 1px solid var(--border); padding: 6px 10px; }
.md-preview ul, .md-preview ol { padding-left: 22px; }

/* ---------- Password generator specific ---------- */
.password-display {
  font-family: var(--mono);
  font-size: 18px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  word-break: break-all;
  min-height: 56px;
  display: flex;
  align-items: center;
}
.slider { width: 100%; accent-color: var(--accent); }
.slider-row { display: flex; align-items: center; gap: 14px; }
.slider-value {
  min-width: 44px;
  text-align: center;
  font-family: var(--mono);
  font-weight: 600;
  padding: 4px 10px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 6px;
  font-size: 13px;
}
.strength-bar {
  height: 6px;
  background: var(--border-muted);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 10px;
}
.strength-fill { height: 100%; transition: width .25s, background .25s; }

/* ---------- Dig specific ---------- */
.dig-output {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  overflow-x: auto;
  min-height: 120px;
  white-space: pre;
}
.dig-output .key { color: var(--muted); }
.dig-output .val { color: var(--text); }
.dig-output .type-a { color: #0969da; }
.dig-output .type-aaaa { color: #8250df; }
.dig-output .type-mx { color: #bf8700; }
.dig-output .type-txt { color: var(--success); }

/* ---------- Toast / copy feedback ---------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }