:root {
    --retrostock-surface: #f5f6f8;
    --retrostock-surface-strong: #eceff3;
    --retrostock-dark: #17191d;
    --retrostock-border: rgba(0, 0, 0, 0.1);
    --header-offset: 88px;
    --anchor-gap: 1.5rem;
}

html {
    scroll-behavior: smooth;
}

body.retrostock-page {
    min-height: 100vh;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: color-mix(in srgb, var(--bs-body-bg) 96%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.site-header .navbar {
    min-height: var(--header-offset);
    padding-top: 0.45rem;
    padding-bottom: 0.45rem;
}

.site-header__brand {
    display: flex;
    flex: 0 1 auto;
    align-items: center;
    max-width: calc(100% - 4rem);
    margin-right: 1.5rem;
    padding: 0;
}

.site-header__logo {
    display: block;
    width: clamp(13.5rem, 22vw, 16rem);
    max-width: 100%;
    height: auto;
    object-fit: contain;
    object-position: left center;
}

.site-header__toggler {
    flex: 0 0 auto;
}

.hero-section {
    overflow: hidden;
}

.py-lg-6 {
    padding-top: 6rem !important;
    padding-bottom: 6rem !important;
}

.section-eyebrow {
    color: var(--bs-primary);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-panel,
.code-showcase {
    border: 1px solid var(--retrostock-border);
    background: var(--retrostock-surface);
}

.entity-stack {
    display: grid;
    gap: 0.75rem;
}

.entity-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--retrostock-border);
    border-radius: 0.85rem;
    background: var(--bs-body-bg);
}

.entity-row strong {
    font-family: var(--bs-font-monospace);
    font-size: 1.15rem;
}

.section-soft {
    background: var(--retrostock-surface);
}

.feature-card,
.dark-card {
    padding: 1.5rem;
    border-radius: 1rem;
}

.feature-card {
    border: 1px solid var(--retrostock-border);
    background: var(--bs-body-bg);
}

.example-list {
    background: var(--bs-body-bg);
}

.example-item {
    display: grid;
    gap: 0.3rem;
    margin-bottom: 1.35rem;
    padding-bottom: 1.35rem;
    border-bottom: 1px solid var(--retrostock-border);
}

.example-item:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.example-item span {
    color: var(--bs-secondary-color);
}

.section-dark {
    background: var(--retrostock-dark);
    color: #fff;
}

.dark-card {
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.06);
}

.entity-code {
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.55);
    font-family: var(--bs-font-monospace);
    font-size: 1.4rem;
    font-weight: 700;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.catalog-grid > div {
    display: flex;
    min-height: 7rem;
    align-items: center;
    padding: 1.25rem;
    border: 1px solid var(--retrostock-border);
    border-radius: 1rem;
    background: var(--bs-body-bg);
    font-weight: 600;
}

.history-list {
    display: grid;
    gap: 0.85rem;
    padding-left: 0;
    list-style: none;
}

.history-list li {
    position: relative;
    padding: 1rem 1rem 1rem 3rem;
    border: 1px solid var(--retrostock-border);
    border-radius: 0.85rem;
}

.history-list li::before {
    position: absolute;
    top: 50%;
    left: 1rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--bs-primary);
    content: '';
    transform: translateY(-50%);
}

.final-cta {
    background: linear-gradient(
        180deg,
        var(--bs-body-bg) 0%,
        var(--retrostock-surface) 100%
    );
}

.site-footer {
    background: var(--bs-body-bg);
}

.faq-page .accordion-button:not(.collapsed) {
    color: var(--bs-primary-text-emphasis);
    background: var(--bs-primary-bg-subtle);
}

.faq-sidebar {
    position: static;
}

@media (min-width: 992px) {
    html {
        scroll-padding-top: calc(
                var(--header-offset) + var(--anchor-gap)
        );
    }

    .faq-sidebar {
        position: sticky;
        top: calc(var(--header-offset) + 1.5rem);
        align-self: flex-start;
        height: fit-content;
        z-index: 10;
    }

    .faq-sidebar__card .list-group {
        max-height: calc(
                100vh - var(--header-offset) - 4.5rem
        );
        overflow-y: auto;
    }
}

@media (max-width: 991.98px) {
    .site-header {
        position: static;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .site-header .navbar {
        min-height: 4.5rem;
    }

    .site-header__brand {
        max-width: calc(100% - 3.75rem);
        margin-right: 0.75rem;
    }

    .site-header__logo {
        width: clamp(11.5rem, 56vw, 14rem);
    }

    .site-header .navbar-collapse {
        margin-top: 0.5rem;
        padding: 0.65rem 0 0.35rem;
        border-top: 1px solid var(--retrostock-border);
    }

    .site-header .navbar-nav {
        align-items: stretch;
    }

    .site-header .nav-link {
        padding: 0.65rem 0;
    }

    .site-header .btn {
        width: 100%;
        margin-top: 0.35rem;
    }

    .py-lg-6 {
        padding-top: 4rem !important;
        padding-bottom: 4rem !important;
    }

    .catalog-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 359.98px) {
    .site-header__logo {
        width: 10.5rem;
    }
}

@media (max-width: 575.98px) {
    .catalog-grid {
        grid-template-columns: 1fr;
    }

    .display-3 {
        font-size: calc(1.75rem + 4vw);
    }
}