/* Ptex styles. Light theme by default, dark theme via [data-theme="dark"] on <html>. */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --surface: #ffffff;
  --text: #14171c;
  --muted: #5d6573;
  --border: #e2e5ea;
  --border-strong: #cfd4dc;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eaf1fe;
  --on-primary: #ffffff;
  --error-bg: #fdeeee;
  --error-text: #a3161a;
  --good: #15803d;
  --mid: #b45309;
  --bad: #b91c1c;
  --mark: #fde68a;
  --mark-text: #3b2a00;
  --focus: #93b4f7;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 4px 16px rgba(16, 24, 40, 0.06);
  --radius: 12px;
  --max: 900px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0f1115;
  --bg-soft: #151820;
  --surface: #171a21;
  --text: #e9ebef;
  --muted: #a1a8b5;
  --border: #272c36;
  --border-strong: #353b47;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-soft: #172540;
  --on-primary: #ffffff;
  --error-bg: #3a1719;
  --error-text: #ffb3b3;
  --good: #4ade80;
  --mid: #fbbf24;
  --bad: #f87171;
  --mark: #5c4708;
  --mark-text: #fff3c4;
  --focus: #3b5ea8;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  color-scheme: dark;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

.skip-link {
  position: absolute; left: 8px; top: -48px; z-index: 100;
  background: var(--primary); color: var(--on-primary);
  padding: 8px 14px; border-radius: 8px; text-decoration: none;
}
.skip-link:focus { top: 8px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px;
}

.brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.2rem; color: var(--text); text-decoration: none;
}

.brand-mark {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary); color: var(--on-primary);
  font-size: 0.95rem;
}

.site-nav {
  display: flex; align-items: center; gap: 2px;
  margin-left: auto;
}

.site-nav a {
  color: var(--muted); text-decoration: none; font-size: 0.93rem; font-weight: 500;
  padding: 7px 10px; border-radius: 8px;
}
.site-nav a:hover { color: var(--text); background: var(--bg-soft); }
.site-nav a.is-active { color: var(--primary); background: var(--primary-soft); }

.header-actions { display: flex; align-items: center; gap: 4px; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; padding: 0;
  color: var(--text); background: transparent;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
}
.icon-btn:hover { background: var(--bg-soft); }

.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

.menu-toggle { display: none; }

/* ---------- Layout ---------- */
.container {
  width: 100%; max-width: var(--max);
  margin: 0 auto; padding: 32px 16px 48px;
  flex: 1;
}

h1 { font-size: clamp(1.8rem, 4.5vw, 2.5rem); line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.4rem; line-height: 1.3; margin: 40px 0 12px; }
h3 { font-size: 1rem; margin: 0 0 8px; }

.hero { margin-bottom: 22px; }
.intro { color: var(--muted); margin: 0; font-size: 1.05rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 18px;
}

/* ---------- Tool ---------- */
.textbox {
  display: block; width: 100%; min-height: 220px; padding: 14px;
  font: inherit; font-size: 1rem; line-height: 1.6;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  resize: vertical;
}
.textbox:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.textbox[readonly] { background: var(--bg-soft); }

.counts {
  display: flex; flex-wrap: wrap; gap: 6px 16px; justify-content: flex-end;
  color: var(--muted); font-size: 0.88rem; margin: 6px 2px 0;
}
.counts b { color: var(--text); font-weight: 600; }
.counts-limit { opacity: 0.85; }
.counts.over b { color: var(--bad); }

.chips {
  border: 0; padding: 0; margin: 14px 0 0;
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
}
.chips legend { font-weight: 600; font-size: 0.95rem; padding: 0; margin-bottom: 8px; }

.chip { position: relative; }
.chip input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.chip span {
  display: inline-block; padding: 6px 14px; font-size: 0.93rem;
  border: 1px solid var(--border-strong); border-radius: 999px;
  background: var(--surface); cursor: pointer;
}
.chip input:checked + span { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.chip input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.btn {
  font: inherit; font-size: 0.98rem; font-weight: 500; line-height: 1.3;
  padding: 10px 18px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--border-strong);
}
.btn:disabled { cursor: progress; opacity: 0.8; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); font-weight: 600; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-secondary { background: var(--surface); color: var(--text); }
.btn-secondary:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }

.btn.is-loading::after {
  content: ""; display: inline-block; width: 0.9em; height: 0.9em; margin-left: 8px; vertical-align: -0.1em;
  border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.message {
  margin: 14px 0 0; padding: 10px 14px; border-radius: 10px;
  background: var(--error-bg); color: var(--error-text);
}

.result { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--border); }
.result-label { display: block; font-weight: 600; margin-bottom: 8px; }
.result-summary { margin: 0 0 12px; font-weight: 600; }

.disclaimer { margin: 16px 2px 0; font-size: 0.9rem; color: var(--muted); }

/* Grammar changes */
.change-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.change-list li {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-soft);
  font-size: 0.95rem;
}
.change-list del { color: var(--bad); text-decoration-thickness: 1.5px; }
.change-list ins { color: var(--good); text-decoration: none; font-weight: 600; }
.change-list .reason { display: block; color: var(--muted); font-size: 0.88rem; margin-top: 2px; }

/* Detector */
.score-panel { margin-bottom: 18px; }
.score-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; margin-bottom: 10px; }
.score-value { font-size: 2.4rem; font-weight: 700; line-height: 1; }
.score-caption { color: var(--muted); font-size: 0.95rem; }
.verdict {
  margin-left: auto; font-weight: 600; font-size: 0.92rem;
  padding: 4px 12px; border-radius: 999px; border: 1px solid currentColor;
}
.verdict.is-human, .meter.is-human span { color: var(--good); }
.verdict.is-mixed, .meter.is-mixed span { color: var(--mid); }
.verdict.is-ai, .meter.is-ai span { color: var(--bad); }

.meter { height: 10px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--border); overflow: hidden; }
.meter span { display: block; height: 100%; width: 0; background: currentColor; border-radius: inherit; transition: width 0.5s ease; }

.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 22px 0; }

.signal-list { margin: 0; padding-left: 1.2em; }
.signal-list li + li { margin-top: 6px; }

.mini-stats { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; margin: 0; font-size: 0.95rem; }
.mini-stats dt { color: var(--muted); }
.mini-stats dd { margin: 0; font-weight: 600; text-align: right; }
.mini-stats dd.full { grid-column: 1 / -1; text-align: left; font-weight: 400; color: var(--muted); font-size: 0.9rem; }

.highlighted {
  padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-soft); white-space: pre-wrap; overflow-wrap: anywhere;
  max-height: 420px; overflow: auto;
}
.highlighted mark { background: var(--mark); color: var(--mark-text); border-radius: 3px; padding: 0 2px; }

/* Word counter */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 18px; }
.stat {
  padding: 12px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-soft);
  display: flex; flex-direction: column; gap: 2px;
}
.stat b { font-size: 1.35rem; line-height: 1.2; }
.stat span { color: var(--muted); font-size: 0.85rem; }

.readability { margin: 0 0 6px; }
.readability b { font-size: 1.6rem; margin-right: 6px; }
.note { color: var(--muted); font-size: 0.88rem; margin: 0; }

.keyword-list { margin: 0; padding-left: 1.3em; }
.keyword-list li { font-size: 0.95rem; }
.keyword-list li span { color: var(--muted); }
.keyword-list .note { list-style: none; margin-left: -1.3em; }

/* Ad slots: empty placeholders that take no space until ad code is added. */
.ad-slot { margin: 28px 0; }
.ad-slot:empty { margin: 0; }

/* ---------- Content ---------- */
.content p { max-width: 75ch; }
.steps, .plain-list { padding-left: 1.3em; margin: 0; }
.steps li + li, .plain-list li + li { margin-top: 6px; }

.example { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.example-box { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.example-box p { margin: 0; }

.faq details { border: 1px solid var(--border); border-radius: var(--radius); padding: 0 16px; background: var(--surface); }
.faq details + details { margin-top: 10px; }
.faq summary { cursor: pointer; font-weight: 600; padding: 13px 0; }
.faq details p { margin: 0 0 14px; color: var(--muted); }

.related { margin-top: 8px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.tool-card {
  display: flex; flex-direction: column; gap: 4px;
  padding: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); text-decoration: none; color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.tool-card:hover { border-color: var(--primary); transform: translateY(-1px); }
.tool-card-name { font-weight: 600; color: var(--primary); }
.tool-card-blurb { color: var(--muted); font-size: 0.93rem; line-height: 1.5; }

.legal p, .legal li { max-width: 72ch; }
.legal .eyebrow {
  display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--primary);
  background: var(--primary-soft); padding: 5px 11px; border-radius: 999px; margin-bottom: 14px;
}
.legal .legal-meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 8px; }
.legal .lead { font-size: 1.05rem; color: var(--muted); margin: 0 0 8px; }
.legal h2 {
  font-size: 1.2rem; margin: 34px 0 10px; padding-top: 18px; border-top: 1px solid var(--border);
}
.legal h2:first-of-type { border-top: 0; padding-top: 0; }
.legal ul.legal-list { padding-left: 0; list-style: none; display: grid; gap: 10px; }
.legal ul.legal-list li { padding-left: 20px; position: relative; }
.legal ul.legal-list li::before {
  content: ""; position: absolute; left: 2px; top: 10px; width: 7px; height: 7px;
  background: var(--primary); border-radius: 50%;
}
.legal .callout {
  margin: 18px 0; padding: 16px 18px; background: var(--bg-soft);
  border: 1px solid var(--border); border-left: 3px solid var(--primary); border-radius: 10px;
}
.legal .callout b { display: block; margin-bottom: 4px; }
.legal .contact-box {
  margin-top: 28px; padding: 18px; text-align: center;
  background: var(--primary-soft); border: 1px solid var(--border); border-radius: var(--radius);
}
.legal .contact-box .eyebrow { margin-bottom: 8px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); color: var(--muted); font-size: 0.93rem; }
.footer-inner {
  max-width: 1100px; margin: 0 auto; padding: 32px 16px 20px;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px;
}
.footer-about p { margin: 10px 0 0; max-width: 34ch; }
.footer-col { display: flex; flex-direction: column; gap: 6px; }
.footer-col h2 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text); margin: 0 0 4px; }
.footer-col a { color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { max-width: 1100px; margin: 0 auto; padding: 14px 16px 24px; border-top: 1px solid var(--border); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .menu-toggle { display: inline-grid; }
  .header-actions { margin-left: auto; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 8px 12px 14px; margin: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .site-nav a { padding: 11px 12px; font-size: 1rem; }
  html.js .site-nav { display: none; }
  html.js .site-header.nav-open .site-nav { display: flex; }
  html:not(.js) .site-nav { position: static; box-shadow: none; border: 0; flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { padding-top: 22px; }
  .card { padding: 14px; border-radius: 14px; }
  .textbox { min-height: 190px; }
  .example, .result-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .actions .btn-primary { flex: 1 1 100%; }
  .actions .btn-secondary { flex: 1 1 0; }
  .counts { justify-content: flex-start; }
  .verdict { margin-left: 0; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-about { grid-column: 1 / -1; }
}

@media (prefers-reduced-motion: reduce) {
  .btn.is-loading::after { animation: none; }
  .meter span, .tool-card { transition: none; }
}

/* ---------- Buttons: extra variants ---------- */
.btn-sm { padding: 7px 13px; font-size: 0.9rem; }
.btn-danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn-danger:hover:not(:disabled) { filter: brightness(1.08); }

/* ---------- Admin panel ---------- */
body.admin { background: var(--bg-soft); }

.admin-top { background: var(--surface); border-bottom: 1px solid var(--border); }
.admin-top-inner {
  max-width: 1100px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.admin-top-actions { display: flex; align-items: center; gap: 8px; }

.admin-wrap { max-width: 1100px; margin: 0 auto; padding: 24px 16px 48px; }

.admin-dash .kpi-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin-bottom: 22px;
}
.kpi {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; display: flex; flex-direction: column; gap: 2px;
}
.kpi b { font-size: 1.6rem; line-height: 1.1; }
.kpi span { color: var(--muted); font-size: 0.82rem; }

.admin-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 18px;
}
.admin-panel h2 { margin: 0 0 14px; font-size: 1.1rem; }
.admin-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.bar-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.bar-list li { display: grid; grid-template-columns: minmax(70px, 34%) 1fr auto; align-items: center; gap: 10px; font-size: 0.9rem; }
.bar-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { background: var(--bg-soft); border-radius: 999px; height: 9px; overflow: hidden; }
.bar-fill { display: block; height: 100%; background: var(--primary); border-radius: 999px; }
.bar-count { font-variant-numeric: tabular-nums; color: var(--muted); font-weight: 600; }

.daychart { display: flex; align-items: flex-end; gap: 6px; height: 170px; }
.daybar { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; gap: 4px; height: 100%; }
.daybar-fill { width: 100%; max-width: 34px; background: var(--primary); border-radius: 6px 6px 0 0; min-height: 2px; }
.daybar-num { font-size: 0.72rem; color: var(--muted); }
.daybar-day { font-size: 0.68rem; color: var(--muted); white-space: nowrap; }

.table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.admin-table th, .admin-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.admin-table th { color: var(--muted); font-weight: 600; }
.tag { font-size: 0.72rem; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 1px 7px; color: var(--muted); }

.admin-card {
  max-width: 440px; margin: 48px auto; background: var(--surface);
  border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); padding: 26px;
}
.admin-card h1 { font-size: 1.5rem; margin: 0 0 12px; }
.admin-label { display: block; font-weight: 600; font-size: 0.9rem; margin: 14px 0 6px; }
.admin-input {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border-strong); border-radius: 10px;
}
.admin-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.admin-card .btn-primary { margin-top: 18px; width: 100%; }
.admin-note { color: var(--muted); font-size: 0.9rem; }
.admin-error { color: var(--error-text); background: var(--error-bg); padding: 9px 12px; border-radius: 10px; font-size: 0.9rem; }
.admin-ok { color: var(--good); font-size: 0.92rem; }
.admin-pre { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 12px; overflow-x: auto; font-size: 0.82rem; }

@media (max-width: 860px) {
  .admin-dash .kpi-grid { grid-template-columns: repeat(3, 1fr); }
  .admin-cols { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .admin-dash .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .daybar-day { display: none; }
}