/* Gas Installer & Supplies - Premium Modern UI */

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --brand: #ea580c;      /* Vibrant Orange */
  --brand-light: #ff7f3f;
  --brand2: #2563eb;     /* Professional Blue */
  --brand2-light: #3b82f6;
  --border: #e2e8f0;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow: 0 10px 40px -10px rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
  --radius: 16px;
  --max: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; border-radius: calc(var(--radius) - 4px); display: block; }
a { color: var(--brand2); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand2-light); text-decoration: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.skip-link {
  position: absolute; left: -999px; top: 10px; background: #000; color: #fff; padding: 10px 12px; border-radius: 10px; z-index: 9999;
}
.skip-link:focus { left: 10px; }

/* Sticky Glassmorphism Header */
header.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.02);
  transition: all var(--transition);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 0; }

.brand {
  display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: -0.5px;
  color: var(--text); font-size: 18px; line-height: 1.2;
}
.brand .mark {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center; font-size: 20px;
  background: linear-gradient(135deg, #ffedd5, #ffedd5);
  border: 1px solid rgba(234, 88, 12, 0.2);
  color: var(--brand);
  box-shadow: 0 4px 10px rgba(234, 88, 12, 0.1);
  transition: transform var(--transition);
}
.brand:hover .mark { transform: scale(1.05) rotate(5deg); }
.brand span { display: block; }
.brand small { display: block; color: var(--muted); font-weight: 500; font-size: 12px; margin-top: 2px; }

nav { display: flex; align-items: center; gap: 12px; }
.nav-links { display: none; gap: 4px; align-items: center; }
.nav-links a { 
  padding: 8px 14px; border-radius: 99px; font-weight: 600; color: var(--muted); font-size: 14px;
  transition: all var(--transition);
}
.nav-links a:hover { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }

.nav-cta { display: flex; gap: 10px; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 99px; font-weight: 700; font-size: 15px;
  transition: all var(--transition); cursor: pointer; text-align: center;
  border: none;
}
.btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  color: #fff;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.3);
}
.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.4);
}
.btn.ghost {
  background: var(--surface); color: var(--text);
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
}
.btn.ghost:hover {
  background: #f1f5f9; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.menu-btn { display: inline-flex; }
.menu-btn button {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 10px 14px; font-weight: 700; color: var(--text); cursor: pointer;
  box-shadow: var(--shadow-sm); transition: all var(--transition);
}
.menu-btn button:hover { background: #f1f5f9; }

.mobile-panel {
  display: none; border-top: 1px solid var(--border); padding: 16px 0 24px;
  animation: fadeIn 0.3s ease forwards;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.mobile-panel a { display: block; padding: 12px 16px; border-radius: 12px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.mobile-panel a:hover { background: var(--surface); color: var(--brand2); padding-left: 20px; }

/* Hero Section */
.hero {
  padding: 60px 0 40px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -100px; right: -100px; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
  border-radius: 50%; z-index: -1;
}
.hero::after {
  content: ''; position: absolute; bottom: -100px; left: -100px; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(234, 88, 12, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
  border-radius: 50%; z-index: -1;
}

.hero-grid { display: grid; gap: 32px; align-items: center; }
.hero-copy { z-index: 1; }
.hero-copy h1 { font-size: clamp(36px, 5vw, 56px); line-height: 1.1; margin: 0 0 16px; font-weight: 900; letter-spacing: -1px; color: #020617; }
.hero-copy p.lead { font-size: clamp(16px, 2vw, 20px); color: var(--muted); margin: 0 0 24px; max-width: 600px; line-height: 1.6; }

.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; background: rgba(255, 255, 255, 0.6); border: 1px solid rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-radius: 99px; color: var(--brand2); font-weight: 700; font-size: 13px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.05);
}

.hero-media { position: relative; border-radius: 24px; overflow: hidden; box-shadow: 0 24px 50px -12px rgba(15, 23, 42, 0.2); }
.hero-media img { display: block; width: 100%; height: auto; object-fit: cover; aspect-ratio: 4/3; transform: scale(1.02); transition: transform 0.6s ease; }
.hero-media:hover img { transform: scale(1.05); }

/* Card System */
.card {
  background: var(--surface); border: 1px solid rgba(255,255,255,0.4);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }

/* Sections */
.section { padding: 40px 0; }
.section h2 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 16px; font-weight: 800; letter-spacing: -0.5px; }
.section p.lead { color: var(--muted); margin: 0 0 32px; font-size: 18px; max-width: 700px; }

.grid-3 { display: grid; gap: 24px; }
.tile { padding: 24px; display: flex; flex-direction: column; }
.tile img { margin-bottom: 20px; width: 100%; height: 200px; object-fit: cover; border-radius: 12px; }
.tile h3 { margin: 0 0 10px; font-size: 22px; font-weight: 700; }
.tile h3 a { color: var(--text); }
.tile h3 a:hover { color: var(--brand2); }
.tile p { margin: 0; color: var(--muted); flex-grow: 1; }

.page-media {
  margin: 0 0 24px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.page-media img {
  width: 100%;
  height: clamp(220px, 34vw, 320px);
  object-fit: cover;
  border-radius: 24px;
}

.kpi { display: flex; gap: 14px; align-items: flex-start; }
.kpi .icon { width: 48px; height: 48px; border-radius: 12px; background: #eff6ff; color: var(--brand2); display: grid; place-items: center; font-size: 24px; flex-shrink: 0; }

.split { display: grid; gap: 24px; }
.list { margin: 0; padding-left: 0; color: var(--muted); list-style: none; }
.list li { margin: 10px 0; padding-left: 28px; position: relative; }
.list li::before { content: '✓'; position: absolute; left: 0; color: var(--brand); font-weight: 900; }

.project-steps {
  counter-reset: project-step;
}
.project-steps li {
  padding-left: 42px;
}
.project-steps li::before {
  counter-increment: project-step;
  content: counter(project-step);
  width: 26px;
  height: 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffedd5;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  top: 0;
}

.check-grid {
  display: grid;
  gap: 12px;
}

.check-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #f8fafc;
}

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  flex-shrink: 0;
}

.check-item label {
  margin: 0;
  font-weight: 600;
  line-height: 1.5;
}

.mini-note {
  color: var(--muted);
  font-size: 14px;
  margin: 0;
}

.cta-band {
  background: linear-gradient(135deg, #1e293b, #0f172a); color: #fff;
  padding: 40px; display: flex; flex-direction: column; gap: 24px; align-items: center; text-align: center;
  border-radius: 24px; position: relative; overflow: hidden;
}
.cta-band::after {
  content: ''; position: absolute; top: -50%; right: -10%; width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(234, 88, 12, 0.4) 0%, rgba(255, 255, 255, 0) 70%); border-radius: 50%;
}
.cta-band strong { font-size: 28px; font-weight: 800; letter-spacing: -0.5px; display: block; margin-bottom: 8px; z-index: 1; }
.cta-band p { margin: 0; color: #cbd5e1; font-size: 18px; max-width: 500px; z-index: 1; }
.cta-band .actions { z-index: 1; display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

.shop-promo {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
  border: 1px solid #fed7aa;
  background: linear-gradient(135deg, #fff7ed, #ffffff);
}
.shop-promo h2 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.5vw, 32px);
}
.shop-promo p {
  margin: 0;
  color: var(--muted);
  max-width: 720px;
}
.shop-promo .actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.breadcrumb { color: var(--muted); font-size: 14px; margin: 0 0 20px; font-weight: 500; }
.breadcrumb a { color: var(--brand2); }

/* FAQ */
.faq details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 20px 24px; margin: 16px 0;
  box-shadow: var(--shadow-sm); transition: all var(--transition);
}
.faq details[open] { border-color: var(--brand2-light); box-shadow: 0 4px 20px rgba(37, 99, 235, 0.1); }
.faq summary { cursor: pointer; font-weight: 700; font-size: 18px; color: var(--text); list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 24px; color: var(--brand2); font-weight: 400; transition: transform 0.3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--muted); margin: 16px 0 0; line-height: 1.6; font-size: 16px; }

/* Forms */
.form { display: grid; gap: 16px; }
label { font-weight: 600; font-size: 14px; color: var(--text); }
input, textarea, select {
  width: 100%; padding: 14px 16px; border-radius: 12px;
  border: 1px solid var(--border); font: inherit; font-size: 16px;
  background: #f8fafc; transition: all var(--transition);
  color: var(--text);
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--brand2-light); background: #fff; box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1); }
textarea { min-height: 140px; resize: vertical; }
.form small { color: var(--muted); font-size: 13px; }

/* Shop */
.shop-tools { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 24px; }
.product { padding: 24px; }
.product h3 { margin: 0 0 10px; font-size: 20px; }
.price { font-weight: 900; font-size: 24px; color: var(--brand2); margin-top: 10px; display: block; }
.tag { display: inline-flex; padding: 6px 12px; border-radius: 99px; background: #fff5f0; border: 1px solid #fed7aa; color: var(--brand); font-weight: 700; font-size: 12px; }

/* Footer */
footer {
  background: #0f172a; color: #cbd5e1; padding: 60px 0 40px; border-top: none;
}
.footer-grid { display: grid; gap: 32px; }
.footer-grid strong { color: #fff; font-size: 18px; margin-bottom: 16px; display: inline-block; }
.footer-grid a { color: #94a3b8; display: block; margin-bottom: 8px; transition: color var(--transition); }
.footer-grid a:hover { color: #fff; }
.footer-grid .mini { color: #64748b; font-size: 13px; margin-top: 16px; display: block; }

@media (min-width: 860px) {
  .nav-links { display: flex; }
  .menu-btn { display: none; }
  .hero { padding: 80px 0 60px; }
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .split { grid-template-columns: 1fr 1fr; gap: 40px; }
  .cta-band { flex-direction: row; justify-content: space-between; text-align: left; }
  .cta-band .actions { justify-content: flex-end; }
  .shop-promo { flex-direction: row; justify-content: space-between; align-items: center; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; gap: 60px; }
}

/* Floating Buttons */
.floating-buttons {
  position: fixed; bottom: 24px; left: 24px; display: flex; flex-direction: column; gap: 16px; z-index: 999;
}
.float-btn {
  width: 60px; height: 60px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  color: white; box-shadow: 0 4px 14px rgba(0,0,0,0.25); transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.float-btn:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0,0,0,0.3); color: white; }
.float-btn svg { width: 32px; height: 32px; }
.call-btn { background: var(--brand2); }
.wa-btn { background: #25D366; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}