:root {
    --primary-color: #0056b3; /* Corporate Blue */
    --secondary-color: #00a8e8; /* Lighter Blue */
    --accent-color: #ffcc00; /* Attention grabbing, e.g. for buttons or highlights */
    --text-color: #333333;
    --light-text-color: #666666;
    --background-color: #ffffff;
    --light-bg-color: #f8f9fa; /* Very light grey for alternate sections */
    --footer-bg-color: #222222;
    --footer-text-color: #cccccc;
    --font-family: 'Roboto', sans-serif;
    --container-width: 1200px;
    --spacing-unit: 1rem;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn--primary:hover {
    background-color: #004494;
    transform: translateY(-2px);
}

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

.btn--secondary:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
}

.section {
    padding: 80px 0;
}

.section__header {
    text-align: center;
    margin-bottom: 60px;
}

.section__title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}

.section__title--light {
  color: #fff;
}

.section__subtitle {
    font-size: 1.2rem;
    color: var(--light-text-color);
}

/* Header */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: 80px;
    display: flex;
    align-items: center;
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav__list {
    display: flex;
    gap: 30px;
}

.nav__link {
    font-weight: 500;
    color: var(--text-color);
}

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

.header__contact {
    display: flex;
    align-items: center;
}

.header__phone {
    font-weight: 700;
    color: var(--primary-color);
}

.burger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.burger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding-top: 160px; /* Header height + spacing */
    padding-bottom: 100px;
    background: linear-gradient(135deg, #f0f4f8 0%, #d9e2ec 100%);
    text-align: center;
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-color);
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--light-text-color);
    max-width: 700px;
    margin: 0 auto 40px;
}

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

/* About Section */
.about {
    background-color: #fff;
}

.about__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about__text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.about__stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.stat-card {
    background: var(--light-bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
}

.stat-card__number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-card__label {
    font-weight: 500;
    color: var(--light-text-color);
}

/* Partners Section */
.partners {
  background-color: var(--light-bg-color);
}

.partners__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.partner-card {
    background: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    font-weight: 700;
    color: var(--light-text-color);
    min-height: 120px;
    transition: var(--transition);
}

.partner-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.partner-card--exclusive {
    border: 2px solid var(--accent-color);
    position: relative;
    color: var(--text-color);
}

.partner-card__tag {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--accent-color);
    color: #333;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
}

/* Infrastructure */
.infrastructure {
    background-color: #fff;
}

.infrastructure__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.infra-card {
    text-align: center;
    padding: 20px;
}

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

.infra-card__title {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Advantages */
.advantages {
    background-color: var(--light-bg-color);
}

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

.advantage-item {
    background: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.advantage-item__icon {
    font-size: 1.5rem;
}

/* Contact */
.contact {
    background-color: var(--primary-color);
    color: #fff;
}

.contact__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.contact__text {
    font-size: 1.1rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.contact__phones {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact__phone {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

.contact__form {
    background: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    color: var(--text-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.contact__form h3 {
    margin-bottom: 20px;
    text-align: center;
}

.contact__form input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
}

.contact__form button {
    margin-top: 10px;
}

/* Footer */
.footer {
    background-color: var(--footer-bg-color);
    color: var(--footer-text-color);
    padding: 30px 0;
    text-align: center;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero__title {
        font-size: 2.8rem;
    }
    
    .about__content {
        grid-template-columns: 1fr;
    }
    
    .contact__container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header__container {
        padding: 0 15px;
    }

    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: #fff;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        z-index: 999;
    }

    .nav.active {
        transform: translateY(0);
    }

    .nav__list {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .header__contact {
        display: none; /* Hide phone in header on mobile if space is tight, or move to menu */
    }

    .burger {
        display: flex;
    }
    
    .hero {
        padding-top: 140px;
        padding-bottom: 60px;
    }

    .hero__title {
        font-size: 2.2rem;
    }

    .section {
        padding: 50px 0;
    }
    
    .contact__form {
        padding: 30px;
    }
}