/* textkitpro.com — design system
   Clean, minimal, sans-serif. Indigo/teal accent pair, system font stack
   (zero external font requests). */

:root {
  --bg: #f7f7fb;
  --bg-raised: #ffffff;
  --bg-inset: #eef0f6;
  --border: #dcdfe8;
  --border-soft: #e7e9f1;
  --text: #1b1d29;
  --text-dim: #565a6e;
  --text-faint: #8a8fa3;
  --accent: #5b4de6;
  --accent-dim: #4438b8;
  --accent-contrast: #ffffff;
  --accent-2: #2bb8a0;
  --danger: #d64545;
  --added-bg: #e3f7ee;
  --added-text: #146c43;
  --removed-bg: #fbeaea;
  --removed-text: #a3262f;
  --focus: #2f6fed;
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  --maxw: 1080px;
}

:root[data-theme="dark"] {
  --bg: #14131d;
  --bg-raised: #1b1a28;
  --bg-inset: #221f31;
  --border: #35334a;
  --border-soft: #2a2838;
  --text: #eceafb;
  --text-dim: #a8a4c4;
  --text-faint: #726e8f;
  --accent: #8b7dff;
  --accent-dim: #6e5fe8;
  --accent-contrast: #14131d;
  --accent-2: #3ee6c4;
  --danger: #ff6b6b;
  --added-bg: #143028;
  --added-text: #5fe0ab;
  --removed-bg: #331c1e;
  --removed-text: #ff9a9a;
  --focus: #8b7dff;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14131d;
    --bg-raised: #1b1a28;
    --bg-inset: #221f31;
    --border: #35334a;
    --border-soft: #2a2838;
    --text: #eceafb;
    --text-dim: #a8a4c4;
    --text-faint: #726e8f;
    --accent: #8b7dff;
    --accent-dim: #6e5fe8;
    --accent-contrast: #14131d;
    --accent-2: #3ee6c4;
    --danger: #ff6b6b;
    --added-bg: #143028;
    --added-text: #5fe0ab;
    --removed-bg: #331c1e;
    --removed-text: #ff9a9a;
    --focus: #8b7dff;
  }
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-dim); text-decoration: none; }
a:hover { text-decoration: underline; }
:root[data-theme="dark"] a { color: var(--accent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) a { color: var(--accent); }
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 12px;
  border-radius: 0 0 6px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; top: 0; }

button, select, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 9px 14px;
  transition: border-color .12s ease, background .12s ease, color .12s ease, transform .06s ease;
}
button:hover { border-color: var(--accent-dim); color: var(--accent-dim); }
:root[data-theme="dark"] button:hover { color: var(--accent); }
button:active { transform: translateY(1px); }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}
button.primary:hover { color: var(--accent-contrast); filter: brightness(1.08); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.icon-btn { padding: 7px 12px; font-size: 13.5px; }

select, input[type="text"], input[type="number"], textarea {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 11px;
  width: 100%;
}
textarea {
  resize: vertical;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}

label { display: block; font-size: 12.5px; font-weight: 600; color: var(--text-dim); margin-bottom: 6px; }
.field { margin-bottom: 14px; }
.field-row { display: flex; gap: 10px; align-items: center; }
.field-row label { margin-bottom: 0; }

/* ---------- layout shell ---------- */
.site-header {
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(8px);
  z-index: 20;
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand-mark img { width: 24px; height: 24px; border-radius: 6px; }
.brand-mark .pro-badge {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--accent-contrast);
  background: var(--accent);
  padding: 2px 6px;
  border-radius: 5px;
  text-transform: uppercase;
}

.header-actions { display: flex; align-items: center; gap: 8px; }

main { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 64px; }

.container-narrow { max-width: 720px; margin: 0 auto; padding: 44px 20px 64px; }
.container-narrow h1 { font-size: 24px; }
.container-narrow h2 { font-size: 17px; margin-top: 32px; }
.container-narrow p, .container-narrow li { color: var(--text-dim); }

.faq-item { margin-bottom: 18px; }
.faq-item h3 { font-size: 15px; margin: 0 0 6px; }
.faq-item p { margin: 0; color: var(--text-dim); }

/* ---------- hero ---------- */
.hero { text-align: center; padding: 12px 0 30px; }
.hero h1 {
  font-size: clamp(24px, 4vw, 36px);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.hero p { color: var(--text-dim); margin: 0; font-size: 15px; }
.hero .trust-line {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--text-faint);
}
.hero .trust-line .dot { color: var(--accent-2); margin: 0 8px; }

/* ---------- tabs ---------- */
.tabbar {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 22px;
}
.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 11px 4px;
  margin-right: 24px;
  color: var(--text-dim);
  font-size: 14.5px;
  font-weight: 600;
  display: inline-block;
  text-decoration: none;
  cursor: pointer;
}
.tab-btn:hover { color: var(--text); border-color: var(--border); }
.tab-btn[aria-selected="true"],
.tab-btn[aria-current="page"] { color: var(--accent-dim); border-color: var(--accent); }
:root[data-theme="dark"] .tab-btn[aria-selected="true"],
:root[data-theme="dark"] .tab-btn[aria-current="page"] { color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- panels ---------- */
.panel {
  background: var(--bg-raised);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 1px 2px rgba(20, 20, 40, .04);
}
.panel h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-faint);
  margin: 0 0 14px;
}
.panel + .panel { margin-top: 16px; }

.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 900px) {
  .tool-grid--split { grid-template-columns: 1fr 1fr; }
}

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.output-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

/* ---------- word counter: stat grid ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
@media (min-width: 640px) {
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .stat-grid { grid-template-columns: repeat(6, 1fr); }
}
.stat-card {
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 12px 14px;
}
.stat-card .stat-value {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-dim);
}
:root[data-theme="dark"] .stat-card .stat-value { color: var(--accent); }
.stat-card .stat-label {
  font-size: 11.5px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-top: 2px;
}

.density-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.density-table th, .density-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border-soft); }
.density-table th { color: var(--text-faint); font-size: 11.5px; text-transform: uppercase; letter-spacing: .05em; font-weight: 600; }
.density-table td:nth-child(2), .density-table td:nth-child(3),
.density-table th:nth-child(2), .density-table th:nth-child(3) { text-align: right; font-variant-numeric: tabular-nums; }
.density-empty { color: var(--text-faint); font-size: 13.5px; padding: 10px 0; }

/* ---------- case converter ---------- */
.case-btn-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.case-btn.is-active { border-color: var(--accent); color: var(--accent-dim); background: color-mix(in srgb, var(--accent) 10%, var(--bg-inset)); }
:root[data-theme="dark"] .case-btn.is-active { color: var(--accent); }

/* ---------- copy flash ---------- */
.copy-flash-wrap { position: relative; display: inline-block; }
.copy-flash {
  position: absolute;
  top: -32px; right: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 4px 10px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .15s ease, transform .15s ease;
  pointer-events: none;
  white-space: nowrap;
}
.copy-flash.show { opacity: 1; transform: translateY(0); }

/* ---------- diff checker ---------- */
.diff-inputs { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 800px) {
  .diff-inputs { grid-template-columns: 1fr 1fr; }
}
.diff-result {
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  overflow: auto;
  max-height: 480px;
  font-family: var(--mono);
  font-size: 13px;
}
.diff-line { display: flex; gap: 10px; padding: 2px 12px; white-space: pre-wrap; word-break: break-word; }
.diff-marker { flex: 0 0 14px; color: var(--text-faint); user-select: none; }
.diff-unchanged { color: var(--text-dim); }
.diff-added { background: var(--added-bg); color: var(--added-text); }
.diff-removed { background: var(--removed-bg); color: var(--removed-text); }
.diff-empty {
  color: var(--text-faint);
  font-size: 13.5px;
  padding: 30px 16px;
  text-align: center;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  margin-top: 48px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 20px 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 12.5px;
}
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); }

/* ---------- misc ---------- */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

::selection { background: var(--accent); color: var(--accent-contrast); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-inset); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

.erabbit-mark { display: block; width: 10px; margin: 0 0 0 auto; line-height: 0; }
.erabbit-mark img { display: block; width: 10px; height: 10px; }