/* Basic reset */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Arial, sans-serif; color: #12202f; line-height: 1.6; }
a { color: #0b5cab; text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 1000; background: #ffffff; border-bottom: 1px solid #e5e7eb; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo { width: 40px; height: 40px; border-radius: 8px; background: linear-gradient(120deg, #0f6ad9, #1fb6ff); }
.brand-name { font-weight: 700; font-size: 20px; }
.nav { display: flex; gap: 18px; align-items: center; }
.nav a { font-weight: 600; }
.btn { display: inline-block; padding: 12px 18px; border-radius: 8px; font-weight: 700; border: 1px solid transparent; }
.btn-primary { background: #0f6ad9; color: #fff; }
.btn-outline { border-color: #0f6ad9; color: #0f6ad9; background: #fff; }
.btn-ghost { background: transparent; color: #0f6ad9; }
.btn-block { display: block; width: 100%; text-align: center; }

/* Hero */
.hero { position: relative; background: #0f243a url('../img/Professional Air Duct Cleaning in Greater Philadelphia hero') center/cover no-repeat; color: #fff; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,0.45), rgba(0,0,0,0.60)); }
.hero-inner { position: relative; z-index: 1; padding: 80px 0; }
.hero h1 { font-size: 40px; margin: 0 0 12px 0; }
.hero p { font-size: 18px; max-width: 780px; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }

/* Sections */
.section { padding: 56px 0; }
.section-title { font-size: 28px; margin: 0 0 16px 0; }
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { border: 1px solid #e5e7eb; border-radius: 12px; padding: 18px; background: #fff; }
.kpis { display: flex; gap: 20px; flex-wrap: wrap; }
.kpi { background: #f3f6fb; padding: 16px; border-radius: 10px; min-width: 160px; }

/* Footer */
.site-footer { background: #0f243a; color: #cfe1ff; padding: 32px 0; }
.site-footer a { color: #cfe1ff; }
.footer-top { display: grid; gap: 20px; grid-template-columns: repeat(4, minmax(0,1fr)); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.15); margin-top: 20px; padding-top: 14px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* Sticky mobile CTA */
.sticky-cta { position: fixed; bottom: 0; left: 0; right: 0; background: #ffffff; border-top: 1px solid #e5e7eb; display: none; gap: 8px; padding: 8px; z-index: 999; }
.sticky-cta .btn { flex: 1; }
@media (max-width: 900px) {
  .nav { display: none; }
  .sticky-cta { display: flex; }
  .footer-top { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}

/* Forms */
form { display: grid; gap: 12px; }
input, textarea, select { width: 100%; padding: 12px; border-radius: 8px; border: 1px solid #c9d2e0; font-size: 16px; }
label { font-weight: 600; }
.small { font-size: 14px; color: #5b6b7a; }
.success { background: #ecfdf5; border: 1px solid #34d399; padding: 12px; border-radius: 8px; }
.warning { background: #fff7ed; border: 1px solid #f59e0b; padding: 12px; border-radius: 8px; }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid #e5e7eb; padding: 10px; text-align: left; }
th { background: #f8fafc; }

.badge { display: inline-block; background: #e6f2ff; color: #0f6ad9; padding: 4px 8px; border-radius: 999px; font-weight: 700; font-size: 12px; }