/* ════════════════════════════════════════════════════════════════════════
   Free Tools pages (/tools/). Self-contained — does NOT depend on Tailwind.
   Light tool surface framed by the site's dark nav/footer.
   ════════════════════════════════════════════════════════════════════════ */
:root {
  --t-surface: #ffffff;
  --t-soft:    #f9fafb;
  --t-border:  #e5e7eb;
  --t-ink:     #111827;
  --t-body:    #374151;
  --t-muted:   #6b7280;
  --t-primary: #2563eb;
  --t-primary-hover: #1d4ed8;
  --t-green:  #16a34a;  --t-green-bg:  #dcfce7;  --t-green-text:  #15803d;
  --t-yellow: #ca8a04;  --t-yellow-bg: #fef9c3;  --t-yellow-text: #a16207;
  --t-red:    #dc2626;  --t-red-bg:    #fee2e2;  --t-red-text:    #b91c1c;
  --t-blue-bg: #dbeafe; --t-blue-text: #1d4ed8;
  --t-amber-bg:#fef3c7; --t-amber-text:#b45309;
}

.tool-main {
  max-width: 768px;
  margin: 32px auto 64px;
  padding: 32px;
  background: var(--t-surface);
  color: var(--t-body);
  border-radius: 22px;
  border: 1px solid var(--t-border);
}
.tool-main--wide { max-width: 920px; }

.tool-breadcrumb { font-size: 0.875rem; color: var(--t-muted); margin-bottom: 24px; }
.tool-breadcrumb a { color: var(--t-muted); text-decoration: none; }
.tool-breadcrumb a:hover { color: var(--t-ink); }
.tool-breadcrumb span[aria-hidden] { padding: 0 4px; }

.tool-hero { margin-bottom: 32px; }
.tool-hero h1 { font-size: 2rem; font-weight: 800; color: var(--t-ink); letter-spacing: -0.02em; }
.tool-hero p { margin-top: 12px; font-size: 1.125rem; color: var(--t-body); }

.tool-panel {
  border: 1px solid var(--t-border);
  background: var(--t-surface);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.06);
}

/* Buttons */
.tool-btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; padding: 10px 20px; font-weight: 600;
  font-size: 0.95rem; cursor: pointer; text-decoration: none;
  border: 1px solid transparent; transition: background .15s, border-color .15s;
}
.tool-btn--primary { background: var(--t-primary); color: #fff; }
.tool-btn--primary:hover { background: var(--t-primary-hover); }
.tool-btn--ghost { background: #fff; color: var(--t-ink); border-color: #d1d5db; }
.tool-btn--ghost:hover { background: var(--t-soft); }
.tool-btn--dark { background: #111827; color: #fff; }
.tool-btn--dark:hover { background: #1f2937; }
.tool-link { color: var(--t-primary); font-weight: 600; text-decoration: none; }
.tool-link:hover { text-decoration: underline; }
.tool-textlink { color: var(--t-muted); font-size: 0.875rem; font-weight: 600;
  background: none; border: 0; cursor: pointer; padding: 0; }
.tool-textlink:hover { color: var(--t-ink); }

/* Related-app CTA */
.tool-cta { margin-top: 40px; background: var(--t-soft); border: 1px solid var(--t-border);
  border-radius: 16px; padding: 24px; }
.tool-cta__eyebrow { font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--t-muted); margin: 0; }
.tool-cta h2 { margin: 4px 0 0; font-size: 1.25rem; color: var(--t-ink); }
.tool-cta p { margin: 8px 0 0; color: var(--t-body); }
.tool-cta__actions { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 12px; }

/* FAQ */
.tool-faq { margin-top: 48px; }
.tool-faq h2 { font-size: 1.5rem; color: var(--t-ink); }
.tool-faq__list { margin-top: 20px; border-top: 1px solid var(--t-border); }
.tool-faq details { border-bottom: 1px solid var(--t-border); padding: 16px 0; }
.tool-faq summary { cursor: pointer; list-style: none; font-weight: 600;
  color: var(--t-ink); display: flex; justify-content: space-between; align-items: center; }
.tool-faq summary::-webkit-details-marker { display: none; }
.tool-faq summary .plus { color: var(--t-muted); transition: transform .15s; }
.tool-faq details[open] summary .plus { transform: rotate(45deg); }
.tool-faq p { margin: 12px 0 0; color: var(--t-body); }

.tool-more { margin-top: 48px; text-align: center; }

/* ── Index grid ─────────────────────────────────────────────────────────── */
.tools-grid { display: grid; gap: 20px; }
@media (min-width: 640px) { .tools-grid { grid-template-columns: 1fr 1fr; } }
.tool-card { display: block; border: 1px solid var(--t-border); background: var(--t-surface);
  border-radius: 16px; padding: 24px; text-decoration: none; transition: box-shadow .15s, border-color .15s; }
.tool-card:hover { box-shadow: 0 6px 18px rgb(0 0 0 / 0.08); border-color: #d1d5db; }
.tool-card__emoji { font-size: 1.875rem; }
.tool-card h2 { margin: 12px 0 0; font-size: 1.25rem; color: var(--t-ink); }
.tool-card p { margin: 4px 0 0; color: var(--t-body); }
.tool-card__go { margin-top: 16px; display: inline-block; color: var(--t-primary); font-weight: 600; }

/* ── Shared form controls ───────────────────────────────────────────────── */
.tool-textarea, .tool-input {
  width: 100%; border: 1px solid #d1d5db; border-radius: 12px; padding: 16px;
  color: var(--t-ink); font-size: 1rem; font-family: inherit; background: #fff;
}
.tool-textarea { height: 224px; resize: vertical; }
.tool-textarea:focus, .tool-input:focus { outline: 2px solid var(--t-primary); outline-offset: 0; border-color: var(--t-primary); }
.tool-status { margin-top: 16px; color: var(--t-body); }
.tool-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.tool-select { border: 1px solid #d1d5db; border-radius: 10px; padding: 10px 12px; color: var(--t-ink); background: #fff; }
[hidden] { display: none !important; }

/* ── Word counter ───────────────────────────────────────────────────────── */
.wc-stats { margin-top: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (min-width: 640px) { .wc-stats { grid-template-columns: repeat(3, 1fr); } }
.wc-tile { background: var(--t-soft); border: 1px solid var(--t-border); border-radius: 12px;
  padding: 12px; text-align: center; }
.wc-tile__num { font-size: 1.5rem; font-weight: 800; color: var(--t-ink); }
.wc-tile__label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--t-muted); }

/* ── Meters (mic + decibel) ─────────────────────────────────────────────── */
.meter { height: 20px; width: 100%; border-radius: 999px; background: #e5e7eb; overflow: hidden; }
.meter__bar { height: 100%; width: 0; transition: width .075s linear; background: var(--t-green); }
.meter__bar.is-mid { background: var(--t-yellow); }
.meter__bar.is-hot { background: var(--t-red); }
.meter-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--t-muted); margin-bottom: 4px; }
.wave { margin-top: 16px; width: 100%; height: 112px; border-radius: 12px; background: #0f172a; display: block; }
.verdict { margin-top: 16px; font-weight: 600; }
.verdict.is-ok { color: var(--t-green); }
.verdict.is-wait { color: var(--t-muted); }

.db-readout { margin-top: 20px; text-align: center; }
.db-now { font-size: 3.75rem; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--t-ink); line-height: 1; }
.db-unit { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--t-muted); }
.db-zone { margin-top: 8px; display: inline-block; border-radius: 999px; padding: 4px 12px; font-size: 0.85rem; font-weight: 600; }
.db-zone.is-quiet { background: var(--t-green-bg); color: var(--t-green-text); }
.db-zone.is-mod   { background: var(--t-yellow-bg); color: var(--t-yellow-text); }
.db-zone.is-loud  { background: var(--t-red-bg); color: var(--t-red-text); }
.db-stats { margin-top: 16px; display: flex; justify-content: center; gap: 32px; font-size: 0.9rem; color: var(--t-body); }
.db-stats b { color: var(--t-ink); }
.db-scale { margin-top: 20px; }
.db-scale__ticks { margin-top: 4px; display: flex; justify-content: space-between; font-size: 0.7rem; color: #9ca3af; }

/* ── Serial checker ─────────────────────────────────────────────────────── */
.sn-checkbox { display: flex; align-items: center; gap: 8px; color: var(--t-body); }
.sn-label { display: block; font-size: 0.875rem; font-weight: 600; color: var(--t-body); margin-bottom: 4px; }
.tool-input--serial { width: 200px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.125rem; letter-spacing: 0.15em; }
.sn-note { margin-top: 24px; font-size: 0.875rem; color: var(--t-muted); }
.sn-error { border-radius: 10px; background: var(--t-red-bg); color: var(--t-red-text); padding: 12px 16px; }
.sn-result { margin-top: 24px; }
.sn-card { border-radius: 16px; background: var(--t-soft); border: 1px solid var(--t-border); padding: 20px; }
.sn-card__head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.sn-card__head p { margin: 0; font-weight: 600; color: var(--t-ink); }
.sn-mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.sn-list { margin: 16px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; }
.sn-list li { display: flex; gap: 12px; }
.sn-tier { border-radius: 6px; padding: 2px 8px; font-size: 0.72rem; font-weight: 700; white-space: nowrap; height: fit-content; }
.sn-name { font-weight: 600; color: var(--t-ink); }
.sn-blurb { color: var(--t-body); }
.tier-2 { background: var(--t-blue-bg); color: var(--t-blue-text); }
.tier-3 { background: var(--t-amber-bg); color: var(--t-amber-text); }
.tier-4 { background: var(--t-green-bg); color: var(--t-green-text); }