/* styles/layout.css */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.main-content {
    min-height: calc(100vh - 120px); /* Assuming header height might be around 120px with margins */
}

/* Header Layout */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    margin: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Navigation Tabs Layout */
.nav-tabs {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    overflow-x: auto; /* For responsiveness on small screens */
}

.nav-tab { /* Basic layout for a tab item */
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    white-space: nowrap;
    position: relative; /* For badges or other positioned elements inside */
    min-width: fit-content;
    padding: var(--spacing-md) var(--spacing-lg); /* Moved from main.css */
}


/* Tab Content Layout */
.tab-content {
    position: relative; /* For positioning of tab panes or animations */
}

.tab-pane {
    display: none; /* Controlled by JS to show active pane */
    animation: fadeIn var(--transition-normal); /* fadeIn defined in main.css or animations.css */
}

.tab-pane.active {
    display: block;
}

/* Daily Header Layout */
.daily-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.day-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat { /* Layout for individual stat item */
    text-align: center;
}

/* Subject Card Layout */
.subject-card { /* Basic padding and margin for the card */
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

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

/* Checklist Layout */
.checklist-section {
    margin-bottom: var(--spacing-xl);
}

.checklist {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.checklist-item { /* Layout for a single checklist item */
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md); /* Moved from main.css */
}

/* Topic Actions Layout */
.topic-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
}

/* Responsive Layout Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header {
        margin: var(--spacing-sm);
    }
    
    .header-content {
        padding: var(--spacing-md);
    }
    
    .daily-header {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center; /* Center content when stacked */
    }
    
    .day-stats {
        justify-content: center; /* Center stats when header is stacked */
    }
    
    .nav-tabs {
        padding: var(--spacing-xs); /* Reduce padding on smaller screens */
    }
    
    .nav-tab {
        padding: var(--spacing-sm) var(--spacing-md); /* Reduce tab padding */
    }
    
    .topic-actions {
        flex-direction: column; /* Stack action buttons */
    }
}

@media (max-width: 480px) {
    /* Specific layout changes for very small screens */
    .subject-header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}