/* Fact Techz — Phase 1 styles. No frameworks, no external requests. */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --ink: #1e293b;
  --muted: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --dark: #0f172a;
  --success: #059669;
  --warning: #d97706;
  --radius: 12px;
  --maxw: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--dark);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 1.25rem; letter-spacing: .2px; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.05rem; color: #fff;
}
.main-nav ul { display: flex; gap: 4px; list-style: none; }
.main-nav a { color: #cbd5e1; padding: 10px 14px; border-radius: 8px; font-size: .95rem; font-weight: 600; }
.main-nav a:hover, .main-nav a.active { color: #fff; background: rgba(255,255,255,.1); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 1px solid #334155; color: #fff; border-radius: 8px; padding: 8px 12px; font-size: 1.1rem; cursor: pointer; }

/* Hero */
.hero { background: linear-gradient(180deg, #eff6ff, #fff); padding: 64px 0 48px; text-align: center; border-bottom: 1px solid var(--border); }
.hero h1 { font-size: 2.4rem; line-height: 1.2; margin-bottom: 14px; letter-spacing: -0.5px; }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 680px; margin: 0 auto 24px; }
.badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 14px; font-size: .85rem; font-weight: 600; color: var(--ink);
}

/* Tool cards */
.section { padding: 48px 0; }
.section h2 { font-size: 1.7rem; margin-bottom: 8px; text-align: center; }
.section .sub { color: var(--muted); text-align: center; max-width: 640px; margin: 0 auto 28px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 20px; transition: transform .15s ease, box-shadow .15s ease;
  display: flex; flex-direction: column; gap: 10px;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(37,99,235,.12); }
.card-icon { font-size: 1.9rem; }
.card h3 { font-size: 1.1rem; }
.card p { color: var(--muted); font-size: .92rem; flex: 1; }
.card a.btn-link { font-weight: 700; font-size: .95rem; }

/* Tool page layout */
.tool-wrap { max-width: 860px; margin: 0 auto; }
.tool-head { text-align: center; margin: 40px 0 26px; }
.tool-head h1 { font-size: 2rem; margin-bottom: 10px; }
.tool-head p { color: var(--muted); max-width: 640px; margin: 0 auto; }
.privacy-note {
  display: flex; gap: 10px; align-items: flex-start;
  background: #ecfdf5; border: 1px solid #a7f3d0; border-radius: var(--radius);
  padding: 14px 16px; margin: 0 0 22px; font-size: .93rem; color: #065f46;
}
.tool-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: 0 4px 18px rgba(15,23,42,.05); }
textarea.tool-input {
  width: 100%; min-height: 190px; resize: vertical;
  border: 1.5px solid var(--border); border-radius: 10px;
  padding: 14px; font-size: 1rem; font-family: var(--font); line-height: 1.6; color: var(--ink);
}
textarea.tool-input:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 16px 0 4px; }
.btn {
  border: none; border-radius: 9px; padding: 11px 20px; font-size: .98rem; font-weight: 700;
  cursor: pointer; font-family: var(--font); transition: background .15s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #eef2ff; color: var(--primary-dark); border: 1px solid #c7d2fe; }
.btn-secondary:hover { background: #e0e7ff; }
.btn-ghost { background: #fff; color: var(--ink); border: 1.5px solid var(--border); }
.btn-ghost:hover { background: var(--bg-alt); }
.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-top: 18px; }
.stat { background: var(--bg-alt); border: 1px solid var(--border); border-radius: 10px; padding: 14px; text-align: center; }
.stat .num { font-size: 1.6rem; font-weight: 800; color: var(--primary-dark); }
.stat .lbl { font-size: .82rem; color: var(--muted); font-weight: 600; }
.output-box {
  width: 100%; min-height: 150px; border: 1.5px dashed var(--border); border-radius: 10px;
  background: var(--bg-alt); padding: 14px; font-size: 1rem; line-height: 1.6; white-space: pre-wrap; word-break: break-word;
  margin-top: 14px;
}
.field { margin: 12px 0; }
.field label { display: block; font-weight: 700; margin-bottom: 6px; font-size: .95rem; }
.field input[type="number"], .field input[type="text"] {
  border: 1.5px solid var(--border); border-radius: 8px; padding: 10px 12px; font-size: 1rem; width: 220px; max-width: 100%;
}
.checks { display: flex; flex-direction: column; gap: 8px; margin: 12px 0; }
.checks label { display: flex; gap: 10px; align-items: flex-start; font-size: .96rem; cursor: pointer; }
.checks input { margin-top: 5px; width: 17px; height: 17px; accent-color: var(--primary); }
.notice { border-radius: 10px; padding: 13px 16px; margin-top: 16px; font-size: .94rem; }
.notice.info { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }
.notice.warn { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.score-ring { text-align: center; margin: 18px 0 6px; }
.score-num { font-size: 3rem; font-weight: 900; color: var(--primary-dark); }
.score-lbl { font-weight: 700; font-size: 1.15rem; margin-top: 4px; }
.limit-ok { color: var(--success); font-weight: 700; }
.limit-over { color: #dc2626; font-weight: 700; }

/* Content pages */
.prose { max-width: 780px; margin: 0 auto; padding: 40px 20px 56px; }
.prose h1 { font-size: 2rem; margin-bottom: 14px; }
.prose h2 { font-size: 1.35rem; margin: 30px 0 10px; }
.prose p, .prose li { color: #334155; }
.prose ul, .prose ol { margin: 10px 0 10px 24px; }
.prose li { margin-bottom: 6px; }
.updated { color: var(--muted); font-size: .88rem; margin-bottom: 18px; }

/* FAQ */
.faq { max-width: 780px; margin: 0 auto; }
.faq details { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; background: #fff; }
.faq summary { padding: 15px 18px; font-weight: 700; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+ "; color: var(--primary); font-weight: 900; }
.faq details[open] summary::before { content: "– "; }
.faq .a { padding: 0 18px 16px; color: var(--muted); }

/* Footer */
.site-footer { background: var(--dark); color: #cbd5e1; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; padding: 44px 0 28px; }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 12px; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #94a3b8; font-size: .93rem; }
.site-footer a:hover { color: #fff; }
.footer-brand p { font-size: .92rem; color: #94a3b8; margin-top: 10px; max-width: 300px; }
.footer-bottom { border-top: 1px solid #1e293b; padding: 18px 0; text-align: center; font-size: .85rem; color: #64748b; }

/* Related tools */
.related { margin-top: 44px; }
.related h2 { font-size: 1.35rem; margin-bottom: 16px; text-align: left; }

/* Responsive */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 44px 0 34px; }
  .hero h1 { font-size: 1.75rem; }
  .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--dark); padding: 10px 20px 16px; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav a { display: block; padding: 12px 8px; }
  .nav-toggle { display: block; }
  .footer-grid { grid-template-columns: 1fr; }
  .tool-box { padding: 16px; }
  .btn { width: 100%; text-align: center; }
  .btn-row .btn { width: auto; flex: 1; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}