:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --border: #e2e8f0;
  --good: #16a34a;
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

.site-header { background: var(--card); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; }
.nav-links { display: flex; gap: 18px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--accent); }

.hero { text-align: center; padding: 40px 0 8px; }
.hero h1 { font-size: clamp(26px, 4vw, 40px); line-height: 1.2; margin: 0 0 12px; }
.hero .sub { color: var(--muted); max-width: 640px; margin: 0 auto; font-size: 17px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
}

.tool { padding: 20px; margin: 28px 0; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .tool-grid { grid-template-columns: 1fr; } }

.pane { display: flex; flex-direction: column; }
.pane-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.pane-head label { font-weight: 600; font-size: 14px; }
.pane-actions { display: flex; gap: 8px; }

textarea {
  width: 100%;
  min-height: 240px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
  background: #fcfcfd;
}
textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
#output { background: #f6fef9; }

.pane-foot { display: flex; justify-content: space-between; margin-top: 6px; min-height: 20px; }
.pane-foot span { font-size: 12px; color: var(--muted); }

button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { filter: brightness(1.08); }
button.ghost { background: transparent; color: var(--accent); border-color: var(--border); }
button.ghost:hover { border-color: var(--accent); }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
  cursor: pointer;
  background: #fff;
  user-select: none;
}
.chip:hover { border-color: var(--accent); }
.chip input { accent-color: var(--accent); }
.chip .count {
  font-size: 11px;
  background: var(--border);
  border-radius: 999px;
  padding: 0 7px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.chip .count.hot { background: #fee2e2; color: #b91c1c; }
.select-label { font-size: 13px; color: var(--muted); margin-left: auto; }
.select-label select {
  margin-left: 6px;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 13px;
  background: #fff;
}

.findings { margin-top: 14px; }
.findings h3 { font-size: 14px; margin: 0 0 8px; }
.findings ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.findings li { font-size: 13px; display: flex; gap: 8px; align-items: baseline; }
.findings code {
  font-family: var(--mono);
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 12px;
}
.findings b { color: var(--muted); font-weight: 600; }
.all-clear { color: var(--good); font-size: 14px; margin: 8px 0 0; }
.privacy-note { font-size: 12px; color: var(--muted); margin: 14px 0 0; }

section.copy { margin: 48px 0; }
section.copy h2 { font-size: 24px; margin-bottom: 8px; }
section.copy p { color: #334155; max-width: 760px; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 20px; }
.feature { padding: 16px; }
.feature h3 { margin: 0 0 6px; font-size: 15px; }
.feature p { margin: 0; font-size: 13px; color: var(--muted); }

table.chars { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 13px; }
table.chars th, table.chars td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
table.chars th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
table.chars code { font-family: var(--mono); background: var(--accent-soft); color: var(--accent); padding: 1px 6px; border-radius: 6px; font-size: 12px; white-space: nowrap; }
.table-wrap { overflow-x: auto; }

.faq details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { font-weight: 600; cursor: pointer; font-size: 15px; }
.faq details p { color: #334155; margin: 10px 0 0; }

.site-footer { border-top: 1px solid var(--border); margin-top: 60px; padding: 24px 0; background: var(--card); }
.site-footer p { font-size: 13px; color: var(--muted); margin: 4px 0; }
.site-footer a { color: var(--muted); }

.prose { max-width: 720px; margin: 40px auto; }
.prose h1 { font-size: 28px; }
.prose h2 { font-size: 20px; margin-top: 28px; }
.prose p, .prose li { color: #334155; font-size: 15px; }