.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem 1.5rem;
    line-height: 1;
}

.site-header__inner {
    max-width: 1040px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
}

.site-logo {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.site-logo:hover { color: var(--accent); }

.site-logo__mark {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    opacity: 0.85;
    transition: opacity 0.15s;
    align-self: center;
}

.site-logo:hover .site-logo__mark {
    opacity: 1;
}

.site-logo__sup {
    color: var(--accent);
    margin-left: -0.5em;
    letter-spacing: 0;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.site-nav__link {
    padding: 0.5rem 1rem;
    color: var(--muted);
    font-size: var(--fs-0);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.site-nav__link:hover { color: var(--text); }
.site-nav__link[aria-current="page"] { color: var(--accent); text-decoration: underline; }

.site-nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    color: var(--text);
    cursor: pointer;
}

.site-nav-toggle svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
}

.site-nav-toggle:hover { border-color: var(--accent); color: var(--accent); }

@media (max-width: 640px) {
    .site-nav-toggle { display: flex; }

    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.25rem 1.5rem 0.75rem;
        background: var(--panel);
        border-bottom: 1px solid var(--line);
        box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
    }

    .site-header.nav-open .site-nav { display: flex; }

    .site-nav__link {
        padding: 0.75rem 0.25rem;
        border-top: 1px solid var(--line);
    }
}

.site-main {
    flex: 1;
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    padding: var(--space-md) 1.5rem;
}

.site-footer {
    border-top: 1px solid var(--line);
    padding: 1.5rem;
    margin-top: auto;
}

.site-footer__inner {
    max-width: 1040px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    font-size: var(--fs-0);
    color: var(--muted);
}

.site-footer__links { display: flex; gap: 1.5rem; }
.site-footer__link { color: var(--muted); }
.site-footer__link:hover { color: var(--accent); }

.hero {
    padding: var(--space-xl) 0 var(--space-lg);
    border-bottom: 1px solid var(--line);
    margin-bottom: var(--space-lg);
}

.hero__grid {
    display: grid;
    grid-template-columns: 1.25fr 0.9fr;
    gap: var(--space-lg);
    align-items: start;
}

@media (max-width: 900px) {
    .hero { padding: var(--space-lg); }
    .hero__grid { grid-template-columns: 1fr; }
}

.hero__title {
    margin: 0;
    font-size: var(--fs-4);
    line-height: 1.12;
    letter-spacing: 0.02em;
}

.hero__subtitle {
    margin: var(--space-sm) 0 0 0;
    font-size: var(--fs-2);
    color: color-mix(in srgb, var(--text) 85%, var(--muted) 15%);
}

.hero__subtitle--emph {
    font-size: var(--fs-3);
    color: var(--text);
}

.hero__lead {
    margin: var(--space-md) 0 0 0;
    color: var(--muted);
    font-size: var(--fs-1);
    max-width: 60ch;
}

.hero__actions {
    margin-top: var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.hero__visual {
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    overflow: hidden;
    background: color-mix(in srgb, var(--bg) 50%, var(--panel) 50%);
}

.hero__visual img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.hero__visual-caption {
    padding: 0.75rem 0.9rem;
    font-size: 0.78rem;
    color: var(--muted);
    border-top: 1px solid var(--line);
}

.section {
    margin-bottom: var(--space-xl);
}

.section__title {
    font-size: var(--fs-3);
    letter-spacing: 0.03em;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--line);
}

.grid {
    display: grid;
    gap: var(--space-md);
}

.grid--2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--3 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}


.hero__ladder {
    margin: var(--space-md) 0;
    padding: var(--space-sm) 0;
}

.hero__ladder-title {
    font-size: var(--fs-0);
    color: var(--muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.hero__ladder-item {
    padding: var(--space-sm) 0;
    border-top: 1px solid color-mix(in srgb, var(--line) 50%, transparent);
}

.hero__ladder-item:last-child {
    border-bottom: 1px solid color-mix(in srgb, var(--line) 50%, transparent);
}

.hero__ladder-axiom {
    font-size: var(--fs-2);
    color: var(--text);
    line-height: 1.4;
}

.hero__ladder-axiom strong {
    color: var(--accent);
}

.hero__ladder-note {
    margin-top: var(--space-xs);
    font-size: var(--fs-0);
    color: var(--muted);
    line-height: 1.6;
}