/* ===== LAYOUT ===== */
.app-container {
    display: flex;
    height: 100dvh;
    overflow: hidden;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-32);
    background: var(--color-background);
    animation: fadeIn var(--duration-normal) var(--ease-standard);
    position: relative;
}

/* ===== PAGE STRUCTURE ===== */
.page {
    display: none;
    animation: fadeIn var(--duration-normal) var(--ease-standard);
}

.page.active {
    display: block;
}

.page-header {
    margin-bottom: var(--space-32);
}

.page-header-top {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-24);
}

.page-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-8);
    color: var(--color-text);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
}

.page-subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
    line-height: var(--line-height-normal);
}

/* ===== GRID LAYOUT ===== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-24);
    margin-bottom: var(--space-32);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .content-area {
        padding: var(--space-20);
    }

    .grid {
        grid-template-columns: 1fr;
        gap: var(--space-16);
    }

    .page-title {
        font-size: var(--font-size-3xl);
    }

    .page-header-top {
        flex-direction: column;
        gap: var(--space-16);
    }

    .page-header {
        margin-bottom: var(--space-24);
    }
}

@media (max-width: 480px) {
    .content-area {
        padding: var(--space-16);
    }

    .page-title {
        font-size: var(--font-size-2xl);
    }

    .page-subtitle {
        font-size: var(--font-size-sm);
    }

    .page-header {
        margin-bottom: var(--space-20);
    }

    .page-header-top {
        gap: var(--space-12);
    }

    .grid {
        gap: var(--space-12);
        margin-bottom: var(--space-20);
    }
}