html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
}

body {
    margin: 0;
}

main {
    position: relative;
}

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(2px);
    transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}

.site-nav.scrolled {
    background: rgba(0, 0, 0, 0.48);
    backdrop-filter: blur(8px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 clamp(20px, 6vw, 10%);
}

.logo {
    width: auto;
}

.logo-header {
    height: 44px;
}

.logo-footer {
    height: 40px;
}

.menu-toggle {
    display: none;
}

.primary-nav ul {
    display: flex;
    list-style: none;
    gap: clamp(12px, 2vw, 24px);
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.language-switch {
    margin-left: auto;
}

.section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 96px clamp(20px, 6vw, 10%) 80px;
    box-sizing: border-box;
    scroll-snap-align: start;
}

.section-video {
    background: transparent;
}

.section.section-video,
.section.section-video.visible {
    transform: none;
}

.section-video video {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
    opacity: 0;
    pointer-events: none;
}

.section-video.visible video {
    opacity: 1;
}

.section-content {
    position: relative;
    z-index: 1;
    width: min(980px, 100%);
}

.pillars {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
    margin-top: 32px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 36px;
    margin-top: 24px;
}

.location-list {
    list-style: none;
    margin: 8px 0 0;
    padding: 0;
}

.location-list .address-card {
    position: relative;
    padding-top: 12px;
    margin-top: 16px;
    padding-left: 34px;
}

.location-list .address-card::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 0;
    width: 20px;
    height: 20px;
    background: url('../multimedia/images/bdslab-grid.svg') no-repeat center / contain;
}

footer {
    padding: 20px;
}

.footer-inner {
    max-width: 1040px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

@media (max-width: 900px) {
    .menu-toggle {
        display: inline-flex;
        justify-content: center;
        align-items: center;
        width: 42px;
        height: 42px;
        border: 1px solid rgba(255, 255, 255, 0.45);
        border-radius: 8px;
        background: rgba(0, 0, 0, 0.35);
        color: #fff;
        font-size: 1.35rem;
        line-height: 1;
        cursor: pointer;
        margin-left: auto;
    }

    .language-switch {
        margin-left: 0;
    }

    .primary-nav {
        position: fixed;
        top: 76px;
        right: 20px;
        left: 20px;
        background: rgba(8, 8, 8, 0.96);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 12px;
        padding: 16px;
        transform: translateY(-16px);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
    }

    .primary-nav ul {
        flex-direction: column;
        gap: 12px;
    }

    .site-nav.mobile-menu-open .primary-nav {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }
}

@media (max-width: 640px) {
    .logo-header,
    .logo-footer {
        height: 32px;
    }

    .section {
        min-height: auto;
        padding: 110px 20px 60px;
    }

    .pillars,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 22px;
    }

    .location-list .address-card {
        padding-left: 30px;
    }
}