:root {
    --shell-width: 1120px;
}

body > * {
    position: relative;
    z-index: 2;
}

.site-shell,
.page-shell {
    width: min(var(--shell-width), calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 18px 0;
    backdrop-filter: blur(18px);
    background: color-mix(in srgb, var(--bg-main) 76%, transparent);
    border-bottom: 1px solid var(--border);
}

.site-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.page-shell {
    padding: 32px 0 88px;
}

.header-tools {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.section {
    padding: 34px 0;
    scroll-margin-top: 120px;
}

.section-head {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 24px;
    align-items: end;
    margin-bottom: 24px;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: 24px;
    align-items: start;
    padding-top: 18px;
}

.experience-stage {
    display: grid;
    grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
    gap: 22px;
    align-items: start;
}

.credential-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.credential-column,
.hero-copy,
.contact-copy {
    min-width: 0;
}

.credential-column {
    display: grid;
    gap: 16px;
}

.capability-grid,
.contact-detail-grid,
.stack-grid {
    display: grid;
}

.capability-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
}

.stack-grid {
    gap: 16px;
}

.contact-detail-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
}

.site-footer {
    padding: 0 0 28px;
}

.footer-shell {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

@media (max-width: 1080px) {
    .hero,
    .section-head,
    .experience-stage,
    .credential-layout,
    .contact-detail-grid {
        grid-template-columns: 1fr;
    }

    .capability-grid {
        grid-template-columns: 1fr;
    }

    .page-shell {
        padding-top: 30px;
    }

    .section-head {
        gap: 18px;
        margin-bottom: 18px;
    }

    .hero,
    .experience-stage {
        gap: 18px;
    }
}

@media (max-width: 920px) {
    .site-shell {
        flex-wrap: wrap;
        row-gap: 10px;
        column-gap: 14px;
    }

    .header-tools {
        order: 2;
        margin-left: auto;
    }

    .site-nav {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
        row-gap: 8px;
        gap: 14px;
        margin-top: 6px;
        overflow: visible;
        padding-bottom: 4px;
    }
}

@media (max-width: 720px) {
    .page-shell,
    .site-shell {
        width: min(var(--shell-width), calc(100% - 16px));
    }

    .site-header {
        padding: 10px 0 12px;
    }

    .section {
        padding: 30px 0;
        scroll-margin-top: 146px;
    }

    .page-shell {
        padding: 24px 0 74px;
    }

    .site-nav {
        gap: 10px;
        font-size: 12px;
    }

    .header-tools {
        width: auto;
        gap: 8px;
    }

    .header-tools .download-menu {
        flex: 0 0 auto;
    }

    .footer-shell {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 560px) {
    .section {
        padding: 24px 0;
    }

    .page-shell {
        padding: 20px 0 62px;
    }
}