.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.site-logo {
    font-family: 'MasterFont', var(--font-ui);
    font-weight: 900;
    font-size: 2rem;
    color: var(--color-primary-dark);
    flex-shrink: 0;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.site-logo:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text);
    text-decoration: none;
}

.nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.search-form {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    font-family: var(--font-ui);
    font-size: 0.875rem;
    padding: 0.375rem 2.5rem 0.375rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    width: 200px;
    outline: none;
    transition: border-color 0.2s, width 0.2s;
}

.search-input:focus {
    border-color: var(--color-primary);
    width: 260px;
}

.search-btn {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    background: none;
    border: none;
    border-left: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 0.95rem;
    padding: 0 0.6rem;
    color: var(--color-text-muted);
    border-radius: 0 var(--radius) var(--radius) 0;
    transition: color 0.2s, background 0.2s;
}

.search-btn:hover {
    color: var(--color-primary);
}

.site-wrapper {
    flex: 1;
    width: 100%;
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: 2.5rem;
    align-items: start;
}

.site-main {
    min-width: 0;
}

.site-wrapper.no-sidebar {
    grid-template-columns: 1fr;
    max-width: var(--max-width);
}
.site-wrapper.no-sidebar .site-sidebar {
    display: none;
}

.site-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
}

.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    margin-top: 3rem;
}
.site-footer p {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0.5rem;
}

.site-footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: underline;
}

.site-footer a:hover {
    color: #fff;
}

@media (max-width: 900px) {
    .site-wrapper {
        grid-template-columns: 1fr;
    }

    .site-sidebar {
        position: static;
        order: 1;
    }

    .search-input {
        width: 150px;
    }

    .search-input:focus {
        width: 200px;
    }
}

@media (max-width: 600px) {
    .header-inner {
        padding: 0 1rem;
    }

    .site-wrapper {
        padding: 0 1rem;
        margin: 1.5rem auto;
    }
}