/* ============================================================
   Blueprint Construction Calculator — Shared Design System
   area.leapfrogiq.ai
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --brand-primary:       #2563EB;
  --brand-primary-dark:  #1E40AF;
  --brand-primary-light: #DBEAFE;
  --brand-green:         #2ecc71;
  --warning:             #D97706;
  --warning-light:       #FEF3C7;
  --danger:              #DC2626;
  --danger-light:        #FEE2E2;
  --success:             #16A34A;
  --success-light:       #DCFCE7;
  --neutral-50:          #F8FAFC;
  --neutral-100:         #F1F5F9;
  --neutral-200:         #E2E8F0;
  --neutral-300:         #CBD5E1;
  --neutral-400:         #94A3B8;
  --neutral-500:         #64748B;
  --neutral-600:         #475569;
  --neutral-700:         #334155;
  --neutral-800:         #1E293B;
  --bg:                  var(--neutral-50);
  --bg-card:             #ffffff;
  --border:              var(--neutral-200);
  --text:                var(--neutral-800);
  --text-muted:          var(--neutral-500);
  --font-sans:           'Inter', system-ui, sans-serif;
  --radius:              8px;
  --radius-lg:           12px;
  --shadow:              0 1px 3px rgba(0,0,0,.08);
  --shadow-md:           0 4px 6px -1px rgba(0,0,0,.1);
  --shadow-lg:           0 10px 25px -5px rgba(0,0,0,.12);
  --container:           1200px;
  --container-narrow:    800px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
img { max-width: 100%; height: auto; }
a { color: var(--brand-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Site Navigation --- */
.site-nav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 80px;
  gap: 16px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-nav .nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.site-nav .nav-logo img {
  width: 96px;
  height: 96px;
  object-fit: contain;
}
@media (max-width: 768px) {
  .site-nav .nav-logo img {
    width: 32px;
    height: 32px;
  }
}
.site-nav .nav-logo span {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.site-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.site-nav .nav-links a {
  padding: 6px 10px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  color: var(--neutral-600);
  text-decoration: none;
  transition: all .15s;
  white-space: nowrap;
}
.site-nav .nav-links a:hover,
.site-nav .nav-links a.active { color: var(--brand-primary); background: var(--brand-primary-light); }
.site-nav .nav-cta {
  margin-left: auto;
  flex-shrink: 0;
}
.nav-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--neutral-700);
  font-size: 20px;
  line-height: 1;
}
@media (max-width: 768px) {
  .site-nav { padding: 0 16px; }
  .site-nav .nav-links { display: none; }
  .site-nav .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 8px 16px 16px;
    gap: 2px;
    box-shadow: var(--shadow-md);
    z-index: 99;
  }
  .site-nav .nav-links.open a { padding: 10px 12px; }
  .nav-menu-btn { display: flex; align-items: center; justify-content: center; }
  .site-nav .nav-cta { display: none; }
}

/* --- Calculator Title Bar (shown below site-nav on calculator pages) --- */
.calc-title-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 8px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
}
.calc-title-bar h1 {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
  color: var(--text);
}
.calc-title-bar .calc-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.3;
}
.calc-title-bar .header-legal {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.calc-title-bar .header-legal:hover { color: var(--brand-primary); text-decoration: underline; }
@media (max-width: 600px) {
  .calc-title-bar { padding: 8px 16px; }
  .calc-title-bar .calc-subtitle { display: none; }
}

/* --- Site Footer --- */
.site-footer {
  background: var(--neutral-800);
  color: var(--neutral-300);
  padding: 48px 24px 32px;
  margin-top: auto;
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand img {
  width: 120px;
  height: auto;
  border-radius: 8px;
  margin-bottom: 12px;
}
.footer-brand p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--neutral-400);
  max-width: 260px;
  margin-top: 8px;
}
.footer-col h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--neutral-400);
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--neutral-400);
  text-decoration: none;
  margin-bottom: 8px;
  transition: color .15s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  max-width: var(--container);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--neutral-700);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--neutral-500);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: var(--neutral-400); }
.footer-bottom a:hover { color: #fff; }
@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
}

/* --- Page Layout Utilities --- */
.page-wrap { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.page-wrap-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 24px; }
.page-section { padding: 64px 0; }
.page-section + .page-section { border-top: 1px solid var(--border); }
.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 600px;
}
@media (max-width: 600px) {
  .page-section { padding: 40px 0; }
  .section-title { font-size: 22px; }
}

/* --- Buttons (shared) --- */
.btn {
  padding: 10px 20px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.btn-primary { background: var(--brand-primary); color: #fff; }
.btn-primary:hover { background: var(--brand-primary-dark); text-decoration: none; }
.btn-secondary { background: var(--neutral-100); color: var(--neutral-700); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--neutral-200); }
.btn-white { background: #fff; color: var(--brand-primary); }
.btn-white:hover { background: var(--brand-primary-light); text-decoration: none; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

/* --- Card --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

/* --- Badges / Chips --- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-primary { background: var(--brand-primary-light); color: var(--brand-primary); }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-coming-soon { background: var(--neutral-100); color: var(--neutral-500); }

/* --- FAQ accordion --- */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 8px;
}
.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  transition: background .15s;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 20px; font-weight: 300; color: var(--neutral-400); flex-shrink: 0; transition: transform .2s; }
.faq-item[open] summary::after { content: '−'; }
.faq-item summary:hover { background: var(--neutral-50); }
.faq-item .faq-body {
  padding: 4px 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  background: var(--bg-card);
}
.faq-item .faq-body p + p { margin-top: 10px; }
.faq-item .faq-body a { color: var(--brand-primary); }

/* --- Content prose --- */
.prose h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin: 40px 0 12px;
}
.prose h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin: 28px 0 8px;
}
.prose p {
  font-size: 15px;
  color: var(--neutral-700);
  line-height: 1.75;
  margin-bottom: 14px;
}
.prose ul, .prose ol {
  margin: 0 0 14px 20px;
}
.prose li {
  font-size: 15px;
  color: var(--neutral-700);
  line-height: 1.75;
  margin-bottom: 6px;
}
.prose strong { color: var(--text); }
.prose a { color: var(--brand-primary); }