.site-header {
    padding: var(--spacing-md) 0;
    background-color: rgba(246, 244, 240, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}
[data-theme="dark"] .site-header {
    background-color: rgba(26, 24, 22, 0.85);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-weight: var(--font-weight-bold);
    font-size: 1.3rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
}
.logo-text {
    display: inline;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}
.header-actions .btn {
    min-height: 40px;
    padding: 8px 20px;
    font-size: 0.85rem;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-border);
    background-color: var(--color-bg-surface);
    font-size: 1.2rem;
    transition: all var(--transition-base);
    flex-shrink: 0;
}
.theme-toggle:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-focus);
}
.theme-toggle:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

/* ---- Pages ---- */
.page {
    display: none;
    animation: fadeUp 0.4s ease;
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
}
.page.active {
    display: block;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---- Main content pushes footer down ---- */
main {
    flex: 1;
}

/* ---- Landing / Hero ---- */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-md);
    text-align: center;
}
.hero h1 {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;
    line-height: 1.1;
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}
.hero h1 span {
    color: var(--color-accent-text);
}
.hero p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 580px;
    margin: 0 auto var(--spacing-xl);
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ---- Featured ---- */
.featured-section {
    scroll-margin-top: 100px;
}
.featured-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-top: var(--spacing-lg);
}
.featured-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

/* ---- Library ---- */
.library-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}
.library-header h2 {
    font-size: 1.8rem;
    font-weight: var(--font-weight-bold);
}
.library-count {
    font-size: 0.95rem;
}

.prompt-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

/* ---- Footer ---- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    transition: border-color var(--transition-base);
}