:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #f59e0b;
  --text: #0f172a;
  --text-light: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --radius: 12px;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; color: var(--text); line-height: 1.6; background: var(--bg); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Header */
.header { position: sticky; top: 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(8px); border-bottom: 1px solid #e2e8f0; z-index: 100; }
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { font-weight: 800; font-size: 1.4rem; color: var(--primary); }
.nav { display: flex; gap: 1.5rem; }
.nav__link { font-weight: 500; transition: color var(--transition); }
.nav__link:hover { color: var(--primary); }
.header__phone { font-weight: 600; color: var(--text); }
.burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.burger span { width: 24px; height: 2px; background: var(--text); transition: var(--transition); }

/* Hero */
.hero { padding: 80px 0 60px; background: linear-gradient(135deg, #eff6ff 0%, #f0f9ff 100%); text-align: center; }
.hero__content { max-width: 800px; margin: 0 auto; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; margin-bottom: 1rem; line-height: 1.2; }
.hero p { font-size: 1.125rem; color: var(--text-light); margin-bottom: 2rem; }
.hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }
.hero__stats { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; color: var(--text-light); font-size: 0.95rem; }
.stat strong { color: var(--primary); font-size: 1.25rem; display: block; }

/* Buttons */
.btn { display: inline-block; padding: 0.85rem 1.75rem; border-radius: var(--radius); font-weight: 600; transition: all var(--transition); cursor: pointer; border: none; font-size: 1rem; }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(37,99,235,0.3); }
.btn--outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn--outline:hover { background: var(--primary); color: #fff; }
.btn--full { width: 100%; }

/* Sections */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--bg-dark); color: #fff; }
.section__title { text-align: center; font-size: clamp(1.75rem, 4vw, 2.25rem); margin-bottom: 3rem; position: relative; }
.section__title::after { content: ''; display: block; width: 60px; height: 4px; background: var(--accent); margin: 0.75rem auto 0; border-radius: 2px; }

/* Catalog */
.catalog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.card { background: #fff; border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow); transition: transform var(--transition), box-shadow var(--transition); text-align: center; }
.card:hover { transform: translateY(-6px); box-shadow: 0 10px 24px rgba(0,0,0,0.12); }
.card__img { width: 100%; aspect-ratio: 4/3; background: #e2e8f0; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 3rem; margin-bottom: 1rem; }
.card h3 { margin-bottom: 0.5rem; font-size: 1.25rem; }
.card__price { color: var(--primary); font-weight: 700; font-size: 1.1rem; }

/* Advantages */
.advantages-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; }
.adv-item { background: #fff; padding: 1.5rem; border-radius: var(--radius); text-align: center; }
.adv-icon { font-size: 2.5rem; display: block; margin-bottom: 0.75rem; }
.adv-item h3 { margin-bottom: 0.5rem; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 2rem; position: relative; }
.step { text-align: center; position: relative; z-index: 1; }
.step__num { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: var(--primary); color: #fff; border-radius: 50%; font-weight: 700; margin-bottom: 1rem; }
.step h3 { margin-bottom: 0.5rem; }

/* Contact & Form */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
.contact-list { margin-top: 1.5rem; }
.contact-list li { margin-bottom: 0.75rem; font-size: 1.05rem; }
.contact-list a { color: var(--accent); font-weight: 500; }
.form { display: flex; flex-direction: column; gap: 1rem; background: rgba(255,255,255,0.08); padding: 1.5rem; border-radius: var(--radius); backdrop-filter: blur(4px); }
.form input, .form select, .form textarea { padding: 0.85rem; border: 1px solid rgba(255,255,255,0.2); background: rgba(255,255,255,0.05); color: #fff; border-radius: 8px; font-size: 1rem; }
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,0.5); }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--accent); background: rgba(255,255,255,0.1); }
.form__note { font-size: 0.8rem; color: rgba(255,255,255,0.6); text-align: center; margin-top: 0.5rem; }

/* Footer */
.footer { padding: 2rem 0; text-align: center; background: #0b1120; color: #94a3b8; font-size: 0.9rem; border-top: 1px solid #1e293b; }

/* Animations */
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll { opacity: 1; transform: none; transition: none; }
  .card:hover, .btn:hover { transform: none; }
}

/* Mobile */
@media (max-width: 768px) {
  .nav { position: fixed; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 1.5rem; gap: 1.25rem; box-shadow: 0 10px 20px rgba(0,0,0,0.1); transform: translateY(-120%); transition: transform var(--transition); z-index: 99; }
  .nav.open { transform: translateY(0); }
  .burger { display: flex; }
  .burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .burger.active span:nth-child(2) { opacity: 0; }
  .burger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
  .hero { padding: 60px 0 40px; }
  .contact-wrapper { grid-template-columns: 1fr; }
}