:root {
  --primary: #000000;
  --secondary: #FFCC00;
  --accent: #DD0000;
  --text: #222222;
  --text-light: #666666;
  --bg: #F8F9FA;
  --white: #FFFFFF;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --radius: 10px;
  --transition: 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  width: 100%;
  overflow-x: hidden;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

main {
  flex: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin-bottom: 1rem; }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 2rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.75rem; }

.cta-button {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 50px;
  transition: background var(--transition), transform var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  text-decoration: none;
}

.cta-button:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

.cta-button.small { padding: 8px 20px; font-size: 0.85rem; }

.site-header { background: var(--white); box-shadow: var(--shadow); position: sticky; top: 0; z-index: 1000; }
.header-top { background: var(--primary); padding: 6px 0; }
.header-top .notice { color: var(--white); font-size: 0.75rem; text-align: center; }
.header-main { padding: 15px 0; }
.header-main .container { display: flex; align-items: center; justify-content: space-between; }

.logo a {
  display: flex; align-items: center; gap: 10px;
  color: var(--primary); font-family: 'Montserrat', sans-serif; font-weight: 800; font-size: 1.4rem;
}
.logo img { border-radius: 4px; }

.main-nav ul { list-style: none; display: flex; gap: 2rem; }
.main-nav a { color: var(--text); font-weight: 500; transition: color var(--transition); }
.main-nav a:hover { color: var(--accent); }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 5px;
}
.menu-toggle .bar { width: 25px; height: 3px; background: var(--primary); transition: var(--transition); }
.menu-toggle.active .bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active .bar:nth-child(2) { opacity: 0; }
.menu-toggle.active .bar:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

.hero-section { background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%); padding: 60px 0; }
.hero-section .container { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero-content { max-width: 500px; }
.hero-subtitle { font-size: 1.1rem; color: var(--text-light); margin-bottom: 2rem; }
.hero-ctas { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.price-badge { background: var(--secondary); color: var(--primary); font-weight: 700; padding: 10px 20px; border-radius: 50px; font-size: 1.1rem; }
.hero-image img { width: 100%; height: auto; border-radius: var(--radius); box-shadow: var(--shadow); object-fit: cover; aspect-ratio: 3/2; }

.features-section { padding: 70px 0; }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-top: 20px; }
.feature-card { background: var(--white); padding: 30px 25px; border-radius: var(--radius); box-shadow: var(--shadow); text-align: center; transition: transform var(--transition); }
.feature-card:hover { transform: translateY(-5px); }
.feature-card i { font-size: 2.5rem; color: var(--secondary); margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.2rem; }
.feature-card p { color: var(--text-light); font-size: 0.95rem; }

.materials-section { padding: 70px 0; background: var(--white); }
.materials-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-top: 20px; }
.material-card { background: var(--bg); border-radius: var(--radius); padding: 25px; text-align: center; transition: transform var(--transition); box-shadow: var(--shadow); }
.material-card:hover { transform: translateY(-5px); }
.material-card img { width: 100%; height: 160px; object-fit: cover; border-radius: 8px; margin-bottom: 15px; }
.material-card h3 { font-size: 1.2rem; }
.material-card p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 1rem; }
.material-price { font-weight: 700; color: var(--accent); }

.testimonials-section { padding: 70px 0; background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%); color: var(--white); }
.testimonials-section h2 { color: var(--secondary); }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 20px; }
.testimonial-card { background: rgba(255,255,255,0.05); backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.1); padding: 30px; border-radius: var(--radius); }
.testimonial-card p { font-style: italic; margin-bottom: 1.5rem; line-height: 1.7; }
.testimonial-author strong { display: block; font-weight: 600; color: var(--secondary); }
.testimonial-author span { font-size: 0.9rem; opacity: 0.7; }

.configurator-section { padding: 70px 0; }
.configurator-wrapper { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 50px; align-items: start; }

.step-form { background: var(--bg); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); }
.step { display: none; }
.step.active { display: block; }
.step h3 { font-size: 1.3rem; margin-bottom: 1.5rem; color: var(--primary); }

.radio-group.vertical { display: flex; flex-direction: column; gap: 12px; }
.radio-group.vertical label { display: flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 500; }
.radio-group.horizontal { display: flex; gap: 20px; margin-top: 15px; }

select {
  width: 100%; padding: 12px 15px; border: 2px solid #e0e0e0; border-radius: 8px;
  font-family: inherit; font-size: 1rem; background: var(--white); margin-bottom: 20px;
}

.step-controls { display: flex; gap: 15px; margin-top: 25px; }
.step-controls .cta-button { padding: 10px 28px; }

.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-weight: 500; margin-bottom: 0.5rem; }
.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="email"],
.form-group input[type="number"] {
  width: 100%; padding: 12px 15px; border: 2px solid #e0e0e0; border-radius: 8px;
  font-family: inherit; font-size: 1rem; transition: border-color var(--transition);
}
.form-group input:focus, select:focus { outline: none; border-color: var(--accent); }

.checkbox-group { display: flex; align-items: center; gap: 10px; }
.checkbox-group input[type="checkbox"] { width: 20px; height: 20px; }
.checkbox-group label { margin-bottom: 0; font-size: 0.95rem; }

.config-faq { background: var(--white); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }

.faq-accordion { display: flex; flex-direction: column; gap: 10px; }
.faq-item { border: 1px solid #e0e0e0; border-radius: var(--radius); overflow: hidden; }
.faq-question {
  width: 100%; background: var(--white); border: none; padding: 16px 20px;
  text-align: left; font-family: 'Montserrat', sans-serif; font-weight: 600; font-size: 1rem;
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  transition: background var(--transition);
}
.faq-question::after { content: '\f078'; font-family: 'Font Awesome 6 Free'; font-weight: 900; font-size: 0.8rem; transition: transform var(--transition); }
.faq-question.active { background: var(--secondary); }
.faq-question.active::after { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; background: var(--white); }
.faq-answer p { padding: 0 20px 16px; color: var(--text); }

.contact-section { padding: 70px 0; background: linear-gradient(135deg, #f9f9f9 0%, #fff 100%); }
.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-details { list-style: none; margin-top: 20px; }
.contact-details li { display: flex; align-items: center; gap: 15px; padding: 12px 0; font-size: 1rem; border-bottom: 1px solid #eee; }
.contact-details li i { font-size: 1.2rem; color: var(--accent); width: 20px; text-align: center; }

.quote-form { background: var(--white); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); }
.quote-form textarea { width: 100%; padding: 12px 15px; border: 2px solid #e0e0e0; border-radius: 8px; font-family: inherit; resize: vertical; }

.site-footer { background: var(--primary); color: var(--white); padding: 50px 0 30px; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 0.5fr 0.8fr 1fr 1.2fr; gap: 30px; margin-bottom: 30px; }
.footer-col p { font-size: 0.9rem; line-height: 1.8; opacity: 0.85; margin-bottom: 0.5rem; }
.footer-col a { color: var(--secondary); text-decoration: none; font-weight: 500; }
.footer-col a:hover { text-decoration: underline; }
.footer-col .disclaimer-title { font-weight: 600; margin-bottom: 0.75rem; opacity: 1; }
.footer-col .disclaimer-text { font-size: 0.85rem; opacity: 0.7; }

.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.9rem; opacity: 0.6; }

.back-to-top {
  position: fixed; bottom: 30px; right: 30px; width: 44px; height: 44px;
  background: var(--accent); color: var(--white); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2); transition: opacity var(--transition), transform var(--transition);
  opacity: 0; pointer-events: none; z-index: 999;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }

/* ---------- legal pages ---------- */
.legal-content {
  max-width: 800px;
  margin: 40px auto;
  padding: 40px 20px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  word-break: break-word;
}
.legal-content h1 { font-size: 2rem; margin-bottom: 1.5rem; }
.legal-content h2 { font-size: 1.8rem; margin: 2rem 0 1rem; }
.legal-content h3 { font-size: 1.4rem; }
.legal-content p, .legal-content li { font-size: 1rem; line-height: 1.6; color: #333; }
.legal-content ul, .legal-content ol { margin: 1rem 0; padding-left: 1.5rem; }

/* ---------- thanks page ---------- */
.thanks-page {
  min-height: 70vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #f9f9f9 0%, #f3f3f3 100%);
}
.thanks-card {
  background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow);
  max-width: 600px; width: 100%; margin: 40px auto; padding: 50px 30px;
  text-align: center; border: 1px solid rgba(0,0,0,0.06);
  animation: fadeInUp 0.6s ease;
}
.thanks-logo { margin: 0 auto 20px; border-radius: 8px; }
.thanks-card h1 { font-size: 2rem; margin-bottom: 1.5rem; color: var(--primary); }
.thanks-card p { font-size: 1.1rem; color: var(--text); margin-bottom: 1rem; }
.thanks-card .thanks-footer-text { font-size: 0.95rem; color: var(--text-light); margin-top: 2rem; border-top: 1px solid #eee; padding-top: 1.5rem; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 992px) {
  .features-grid, .materials-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr 1fr; }
  .configurator-wrapper { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .main-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--white); box-shadow: var(--shadow);
    max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
  }
  .main-nav.active { max-height: 300px; }
  .main-nav ul { flex-direction: column; padding: 20px; gap: 1rem; }
  .hero-section .container, .contact-wrapper { grid-template-columns: 1fr; text-align: center; }
  .hero-content { margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .logo a { justify-content: center; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 576px) {
  .features-grid, .materials-grid, .testimonials-grid { grid-template-columns: 1fr; }
  .hero-image img { aspect-ratio: 4/3; }
}