/* 
AUDE - Responsive CSS Framework
Comprehensive mobile and tablet support
*/

/* ========================================
   RESPONSIVE BREAKPOINTS
======================================== */
:root {
    /* Breakpoints */
    --mobile-small: 320px;
    --mobile-medium: 375px;
    --mobile-large: 425px;
    --tablet: 768px;
    --tablet-large: 1024px;
    --desktop: 1200px;
    --desktop-large: 1440px;
    
    /* Responsive spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Mobile-first font sizes */
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 1.875rem;
    --fs-4xl: 2.25rem;
    
    /* Touch-friendly sizes */
    --touch-target: 44px;
    --touch-target-sm: 36px;
}

/* ========================================
   BASE RESPONSIVE STYLES
======================================== */

/* Prevent horizontal scroll */
html, body {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* Mobile-first container */
.container {
    width: 100%;
    max-width: 100%;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    margin-left: auto;
    margin-right: auto;
}

/* Responsive images */
img {
    max-width: 100%;
    height: auto;
}

/* Touch-friendly buttons */
button, .btn, input[type="submit"] {
    min-height: var(--touch-target);
    min-width: var(--touch-target);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--fs-base);
}

/* Responsive forms */
input, textarea, select {
    width: 100%;
    max-width: 100%;
    min-height: var(--touch-target);
    font-size: var(--fs-base);
    padding: var(--spacing-sm) var(--spacing-md);
}

/* ========================================
   MOBILE STYLES (320px - 767px)
======================================== */
@media (max-width: 767px) {
    /* Typography scaling */
    .page-title, h1 {
        font-size: var(--fs-2xl) !important;
        line-height: 1.2;
        margin-bottom: var(--spacing-md);
    }
    
    .section-title, h2 {
        font-size: var(--fs-xl) !important;
        line-height: 1.3;
    }
    
    h3 {
        font-size: var(--fs-lg) !important;
    }
    
    p, .text-base {
        font-size: var(--fs-sm) !important;
        line-height: 1.5;
    }
    
    /* Header responsiveness */
    .header, .main-header {
        padding: var(--spacing-sm) var(--spacing-md) !important;
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .header h1 {
        font-size: var(--fs-lg) !important;
    }
    
    .header-actions {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }
    
    /* Navigation */
    .nav-controls {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
    
    .back-button, .profile-btn {
        width: 100%;
        max-width: 200px;
        text-align: center;
        padding: var(--spacing-sm) var(--spacing-md) !important;
        font-size: var(--fs-sm) !important;
    }
    
    /* Main content */
    .main-container {
        margin-top: 80px !important;
        padding: var(--spacing-md) !important;
    }
    
    /* Cards and grids */
    .cards-grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-md) !important;
    }
    
    .part-card, .exam-card {
        padding: var(--spacing-md) !important;
        margin-bottom: var(--spacing-md);
    }
    
    .part-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm) !important;
    }
    
    .part-icon-wrapper {
        width: 40px !important;
        height: 40px !important;
        font-size: var(--fs-lg) !important;
        margin: 0 auto;
    }
    
    /* Forms */
    .form-container {
        padding: var(--spacing-md) !important;
        margin: var(--spacing-sm) !important;
    }
    
    .form-group {
        margin-bottom: var(--spacing-md) !important;
    }
    
    .form-row {
        flex-direction: column !important;
        gap: var(--spacing-md) !important;
    }
    
    /* Buttons */
    .btn-group {
        flex-direction: column !important;
        gap: var(--spacing-sm) !important;
    }
    
    .submit-btn, .primary-btn {
        width: 100% !important;
        padding: var(--spacing-md) !important;
        font-size: var(--fs-base) !important;
    }
    
    /* Tables */
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    table {
        min-width: 600px;
        font-size: var(--fs-sm) !important;
    }
    
    th, td {
        padding: var(--spacing-sm) !important;
    }
    
    /* Modal adjustments */
    .modal-content {
        margin: var(--spacing-sm) !important;
        padding: var(--spacing-md) !important;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    /* Exam interface */
    .exam-container {
        padding: var(--spacing-sm) !important;
    }
    
    .question-card {
        padding: var(--spacing-md) !important;
        margin-bottom: var(--spacing-md) !important;
    }
    
    .answers-grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-sm) !important;
    }
    
    .answer-option {
        padding: var(--spacing-md) !important;
        font-size: var(--fs-sm) !important;
    }
    
    /* Progress indicators */
    .progress-container {
        flex-direction: column !important;
        gap: var(--spacing-sm) !important;
    }
    
    .progress-bar {
        height: 8px !important;
    }
    
    /* Section headers */
    .section-header {
        padding: var(--spacing-md) !important;
        flex-direction: row;
        align-items: center;
    }
    
    .section-icon {
        width: 32px !important;
        height: 32px !important;
    }
    
    /* Hide non-essential elements on mobile */
    .desktop-only {
        display: none !important;
    }
    
    /* Show mobile-specific elements */
    .mobile-only {
        display: block !important;
    }
}

/* ========================================
   TABLET STYLES (768px - 1023px)
======================================== */
@media (min-width: 768px) and (max-width: 1023px) {
    .container {
        max-width: 750px;
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
    
    /* Typography for tablets */
    .page-title, h1 {
        font-size: var(--fs-3xl) !important;
    }
    
    .section-title, h2 {
        font-size: var(--fs-2xl) !important;
    }
    
    /* Header adjustments */
    .header-content {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .header-actions {
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    /* Grid layouts */
    .cards-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: var(--spacing-lg) !important;
    }
    
    /* Forms in two columns */
    .form-row {
        flex-direction: row !important;
        gap: var(--spacing-lg) !important;
    }
    
    .form-row .form-group {
        flex: 1;
    }
    
    /* Exam interface adjustments */
    .answers-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: var(--spacing-md) !important;
    }
    
    /* Modal sizing */
    .modal-content {
        max-width: 90%;
        margin: var(--spacing-xl) auto;
    }
    
    /* Show tablet-specific elements */
    .tablet-only {
        display: block !important;
    }
}

/* ========================================
   LARGE TABLET / SMALL DESKTOP (1024px+)
======================================== */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
    }
    
    /* Three column layouts */
    .cards-grid {
        grid-template-columns: repeat(3, 1fr) !important;
    }
    
    /* Show desktop elements */
    .desktop-only {
        display: block !important;
    }
    
    /* Hide mobile-specific elements */
    .mobile-only, .tablet-only {
        display: none !important;
    }
}

/* ========================================
   SMALL MOBILE ADJUSTMENTS (320px - 374px)
======================================== */
@media (max-width: 374px) {
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    .page-title, h1 {
        font-size: var(--fs-xl) !important;
    }
    
    .header {
        padding: var(--spacing-xs) var(--spacing-sm) !important;
    }
    
    .part-card {
        padding: var(--spacing-sm) !important;
    }
    
    .btn {
        padding: var(--spacing-sm) !important;
        font-size: var(--fs-sm) !important;
    }
}

/* ========================================
   ACCESSIBILITY IMPROVEMENTS
======================================== */

/* Focus styles for touch devices */
button:focus, input:focus, select:focus, textarea:focus {
    outline: 2px solid var(--primary, #41B8A5);
    outline-offset: 2px;
}

/* Improved tap targets */
@media (pointer: coarse) {
    button, .btn, a[role="button"] {
        min-height: 48px;
        min-width: 48px;
    }
    
    input[type="checkbox"], input[type="radio"] {
        width: 20px;
        height: 20px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    * {
        border-color: currentColor !important;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   UTILITY CLASSES
======================================== */

/* Display utilities */
.d-mobile-none { display: none; }
.d-tablet-none { display: none; }
.d-desktop-none { display: none; }

@media (max-width: 767px) {
    .d-mobile-block { display: block !important; }
    .d-mobile-flex { display: flex !important; }
    .d-mobile-none { display: none !important; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .d-tablet-block { display: block !important; }
    .d-tablet-flex { display: flex !important; }
    .d-tablet-none { display: none !important; }
}

@media (min-width: 1024px) {
    .d-desktop-block { display: block !important; }
    .d-desktop-flex { display: flex !important; }
    .d-desktop-none { display: none !important; }
}

/* Text utilities */
.text-center-mobile {
    text-align: left;
}

@media (max-width: 767px) {
    .text-center-mobile {
        text-align: center !important;
    }
}

/* Spacing utilities */
.p-mobile-sm { padding: var(--spacing-sm); }
.p-mobile-md { padding: var(--spacing-md); }
.p-mobile-lg { padding: var(--spacing-lg); }

.m-mobile-sm { margin: var(--spacing-sm); }
.m-mobile-md { margin: var(--spacing-md); }
.m-mobile-lg { margin: var(--spacing-lg); }

/* Width utilities */
.w-mobile-full {
    width: 100%;
}

.w-tablet-half {
    width: 100%;
}

@media (min-width: 768px) {
    .w-tablet-half {
        width: 50%;
    }
}