:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-bg: #f3f4f6;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    font-weight: 700;
}

.bg-light {
    background-color: var(--light-bg);
}

/* Header & Nav */
.header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--white);
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.logo span {
    color: var(--primary-color);
}

.menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: var(--transition);
}

.menu a:hover {
    color: var(--primary-color);
}

.phone {
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

/* Hero Section */
.hero {
    padding: 120px 0;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1560518883-ce09059eeffa?auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    color: var(--white);
    text-align: center;
}

.hero__content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero__btns {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

.btn--primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn--primary:hover {
    background-color: var(--secondary-color);
}

.btn--secondary {
    background-color: var(--white);
    color: var(--text-color);
}

.btn--outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn--outline:hover {
    background: var(--primary-color);
    color: var(--white);
}

.w-100 {
    width: 100%;
}

/* Benefits */
.benefits__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.benefit-card {
    padding: 40px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.benefit-card__icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

/* Catalog */
.catalog__tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.tab-btn {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    background: var(--white);
    border-radius: 25px;
    cursor: pointer;
}

.tab-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.catalog__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.object-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.object-card__img {
    height: 250px;
    background-size: cover;
    background-position: center;
}

.object-card__content {
    padding: 25px;
}

.object-card__content h3 {
    margin-bottom: 10px;
}

.object-card__content .price {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 15px 0;
}

/* Calculator */
.calc-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.calc-result {
    background: var(--light-bg);
    padding: 30px;
    border-radius: 10px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.result-item strong {
    color: var(--primary-color);
    font-size: 1.3rem;
}

/* Services */
.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-item {
    padding: 30px;
    background: var(--white);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 8px 8px 0;
}

/* CTA Section */
.cta-box {
    background: var(--primary-color);
    color: var(--white);
    padding: 60px;
    border-radius: 20px;
    text-align: center;
}

.cta-form {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-form input {
    flex: 1;
    padding: 15px;
    border-radius: 8px;
    border: none;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.footer__grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero__btns { flex-direction: column; }
    .calc-wrapper { grid-template-columns: 1fr; }
    .cta-form { flex-direction: column; }
    .nav { flex-direction: column; gap: 20px; }
    .menu { display: none; } /* Для простоты скрываем меню на мобилках */
}