/* QuickTools — mobile-first light theme. Zero external requests: system font stack only. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --text: #1a2332;
  --muted: #5b6b82;
  --brand: #1d4ed8;
  --brand-dark: #1e40af;
  --border: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
  --radius: 12px;
  --max-width: 1100px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand { text-decoration: none; color: var(--text); display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-weight: 800; font-size: 1.35rem; color: var(--brand); letter-spacing: -0.02em; }
.brand-tag { font-size: 0.72rem; color: var(--muted); }

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
}
.main-nav a {
  display: block;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}
.main-nav a:hover, .main-nav a[aria-current="page"] {
  background: var(--bg-soft);
  color: var(--brand);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
}

/* ---------- layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 1.5rem 1rem 3rem; }
.hero {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  margin-bottom: 2rem;
}
.hero h1 { margin: 0 0 0.5rem; font-size: 2rem; letter-spacing: -0.02em; }
.hero p.lead { color: var(--muted); font-size: 1.1rem; margin: 0 auto; max-width: 40rem; }
.privacy-note {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
}

/* ---------- cards ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}
.tool-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 1.25rem;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}
.tool-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(16, 24, 40, 0.12); }
.tool-card h3 { margin: 0 0 0.35rem; font-size: 1.1rem; color: var(--brand); }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.tool-card .card-cta { display: inline-block; margin-top: 0.6rem; font-weight: 600; font-size: 0.9rem; color: var(--brand-dark); }

/* ---------- breadcrumbs ---------- */
.breadcrumbs { font-size: 0.9rem; color: var(--muted); margin-bottom: 1rem; }
.breadcrumbs a { color: var(--brand); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.breadcrumbs [aria-current="page"] { color: var(--muted); }

/* ---------- tool UI ---------- */
.tool-box {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1.5rem 0;
}
.tool-box label { display: block; font-weight: 600; margin-bottom: 0.4rem; }
textarea, input[type="text"], input[type="number"] {
  width: 100%;
  font: inherit;
  padding: 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
}
textarea { min-height: 160px; resize: vertical; }
textarea:focus, input:focus, button:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.75rem; }
button, .btn {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-weight: 600;
}
button:hover, .btn:hover { border-color: var(--brand); color: var(--brand); }
button.primary, .btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
button.primary:hover, .btn.primary:hover { background: var(--brand-dark); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
  margin-top: 1rem;
}
.stat {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
}
.stat .stat-label { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat .stat-value { font-size: 1.35rem; font-weight: 700; }

.checkbox-grid { display: grid; grid-template-columns: 1fr; gap: 0.4rem; margin: 0.75rem 0; }
.checkbox-grid label { display: flex; gap: 0.5rem; align-items: flex-start; font-weight: 500; cursor: pointer; }
.checkbox-grid input { margin-top: 0.3rem; width: auto; accent-color: var(--brand); }
.toggle-row { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; margin: 0.75rem 0; }
.toggle-row label { display: flex; gap: 0.5rem; align-items: center; font-weight: 500; cursor: pointer; }
.toggle-row input { width: auto; accent-color: var(--brand); }
input[type="range"] { width: 100%; accent-color: var(--brand); }
.output-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem;
  margin-top: 0.75rem;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 3rem;
}
.password-display {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.strength-meter { font-weight: 700; margin-top: 0.4rem; }
.error-box {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  border-radius: 8px;
  padding: 0.8rem;
  margin-top: 0.75rem;
}

/* ---------- prose ---------- */
.prose { max-width: 46rem; }
.prose h2 { margin-top: 2rem; font-size: 1.35rem; }
.prose h3 { font-size: 1.1rem; }
.prose li { margin-bottom: 0.3rem; }
.faq details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  margin-bottom: 0.6rem;
  background: #fff;
}
.faq summary { font-weight: 600; cursor: pointer; }
.related-tools { margin-top: 2.5rem; }
.filter-input { max-width: 28rem; margin: 1rem 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); }
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
}
.site-footer nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
.site-footer a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.site-footer a:hover { color: var(--brand); text-decoration: underline; }
.footer-note { font-size: 0.85rem; color: var(--muted); width: 100%; }

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .checkbox-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.5rem; }
}
@media (min-width: 960px) {
  .tool-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 639px) {
  .nav-toggle { display: block; }
  .main-nav { display: none; width: 100%; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; padding: 0.5rem 0; }
  .header-inner { flex-wrap: wrap; }
}

/* --- Batch 2: converter tool UI --- */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
  background: var(--bg-soft);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--brand);
  background: #eff6ff;
}
.drop-zone input[type="file"] { display: none; }
.file-list { list-style: none; padding: 0; margin: 1rem 0; display: grid; gap: .5rem; }
.file-list li {
  display: flex; align-items: center; gap: .75rem;
  border: 1px solid var(--border); border-radius: 8px;
  padding: .5rem .75rem; background: #fff;
}
.file-list img.thumb { width: 48px; height: 48px; object-fit: cover; border-radius: 6px; flex: none; }
.file-list .file-meta { flex: 1; min-width: 0; }
.file-list .file-meta .fname { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-list .file-meta .fsize { color: var(--muted); font-size: .85rem; }
.file-list .remove-btn {
  border: 1px solid var(--border); background: #fff; border-radius: 6px;
  padding: .25rem .6rem; cursor: pointer; font-size: .85rem;
}
.file-list .remove-btn:hover { background: #fee2e2; border-color: #fca5a5; }
.opt-grid { display: grid; gap: .75rem; margin: 1rem 0; }
.opt-row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.opt-row label { font-weight: 600; }
.opt-row input[type="number"], .opt-row select {
  padding: .45rem .6rem; border: 1px solid var(--border); border-radius: 8px; font: inherit;
}
.result-box { margin-top: 1rem; }
.download-list { list-style: none; padding: 0; margin: .75rem 0; display: grid; gap: .5rem; }
.download-list a.dl {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--brand); color: #fff; text-decoration: none;
  padding: .6rem 1.1rem; border-radius: 8px; font-weight: 600;
}
.download-list a.dl:hover { filter: brightness(1.08); }
.progress-note { color: var(--muted); font-size: .9rem; }

/* ---------- batch 3: calculator forms ---------- */
.form-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1rem; }
.form-field { flex: 1 1 11rem; min-width: 9rem; }
.form-field label { display: block; font-weight: 600; margin-bottom: 0.4rem; }
.form-field input[type="number"], .form-field input[type="date"], .form-field input[type="time"], .form-field select {
  width: 100%; padding: .55rem .7rem; border: 1px solid var(--border);
  border-radius: 8px; font-size: 1rem; background: var(--bg); color: var(--text);
}
.data-table { width: 100%; border-collapse: collapse; margin-top: 1rem; font-size: .95rem; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: .5rem .7rem; text-align: right; }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th { background: var(--bg-soft); }
.disclaimer { color: var(--muted); font-size: .92rem; }