:root {
    --page-container-max-width: 1100px;
    --space-section-inline: 20px;
    --font-size-section-title: clamp(2rem, 4.8vw, 3.4rem);
    --color-text-primary: #000000;
    --color-text-secondary: rgba(0, 0, 0, 0.68);
    --color-text-inverse: #ffffff;
    --color-neutral-100: #ffffff;
    --color-quick-nav-surface: rgba(255, 255, 252, 0.9);
    --color-quick-nav-border: rgba(0, 0, 0, 0.08);
    --color-quick-nav-shadow: rgba(0, 0, 0, 0.14);
    --color-quick-nav-link-active: rgba(0, 0, 0, 0.08);
    --size-quick-nav-control: 42px;
    --space-quick-nav-inline: 12px;
    --size-quick-nav-scroll-max: 20rem;
    --size-quick-nav-scroll-reserve: 13.5rem;
    --space-footer-bottom: 84px;
}

.content-width {
    width: min(100%, var(--page-container-max-width));
    margin-left: auto;
    margin-right: auto;
    box-sizing: border-box;
}

.section-title {
    margin: 0;
    font-size: var(--font-size-section-title);
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.06em;
    text-align: left;
    padding-bottom: 2rem;
}

.page-section {
    padding-left: var(--space-section-inline);
    padding-right: var(--space-section-inline);
    scroll-margin-top: 72px;
    content-visibility: auto;
    contain-intrinsic-size: 1px 1000px;
}

.quick-nav {
    position: fixed;
    left: 50%;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    z-index: 30;
    width: fit-content;
    max-width: calc(100vw - (var(--space-quick-nav-inline) * 2));
    transform: translate3d(-50%, calc(100% + 20px), 0);
    opacity: 0;
    pointer-events: none;
    padding-left: var(--space-quick-nav-inline);
    padding-right: var(--space-quick-nav-inline);
    transition: transform 420ms cubic-bezier(0.2, 0.9, 0.2, 1), opacity 320ms ease;
}

.quick-nav.is-visible {
    transform: translate3d(-50%, 0, 0);
    opacity: 1;
    pointer-events: auto;
}

.quick-nav-inner {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    width: fit-content;
    max-width: 100%;
    overflow: hidden;
    padding: 0.5rem;
    border-radius: 999px;
    background-color: var(--color-quick-nav-surface);
    box-shadow: 0 12px 32px var(--color-quick-nav-shadow);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.quick-nav-actions,
.quick-nav-scroll {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.quick-nav-scroll {
    min-width: 0;
    max-width: min(var(--size-quick-nav-scroll-max), calc(100vw - var(--size-quick-nav-scroll-reserve)));
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
}

.quick-nav-scroll::-webkit-scrollbar,
.quick-nav-inner::-webkit-scrollbar {
    display: none;
}

.quick-nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    min-height: var(--size-quick-nav-control);
    padding: 0 0.9rem;
    border-radius: 999px;
    color: var(--color-text-primary);
    background-color: transparent;
    text-decoration: none;
    white-space: nowrap;
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.01em;
    scroll-snap-align: start;
    transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.quick-nav-link:focus-visible {
    outline: 2px solid var(--color-text-primary);
    outline-offset: 2px;
}

.quick-nav-link-primary {
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
}

.quick-nav-link-primary:hover {
    transform: translateY(-1px);
}

.quick-nav-link-meta {
    color: var(--color-text-secondary);
}

.quick-nav-link.is-active:not(.quick-nav-link-primary) {
    color: var(--color-text-primary);
    background-color: var(--color-quick-nav-link-active);
}

.site-footer {
    margin-top: 40px;
    padding-left: var(--space-section-inline);
    padding-right: var(--space-section-inline);
    padding-bottom: calc(28px + var(--space-footer-bottom) + env(safe-area-inset-bottom, 0px));
    color: var(--color-text-primary);
}

.footer-columns {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-column {
    display: flex;
    flex: 0 1 auto;
    flex-direction: column;
    gap: 10px;
    min-width: 180px;
}

.footer-title {
    font-weight: 700;
}

.footer-column a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    :root {
        --size-quick-nav-control: 38px;
        --space-quick-nav-inline: 10px;
        --size-quick-nav-scroll-max: 10.75rem;
        --size-quick-nav-scroll-reserve: 9.25rem;
    }

    .quick-nav {
        bottom: 0;
        padding: 0 var(--space-quick-nav-inline) calc(env(safe-area-inset-bottom, 0px) + 10px);
    }

    .quick-nav-inner {
        padding: 0.4375rem;
        border-radius: 20px;
    }

    .quick-nav-link {
        min-height: 2.25rem;
        padding: 0 0.75rem;
        font-size: 0.78125rem;
    }
}