/* Melhorias Mobile-First */
* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f6f8fa;
    color: #222;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header responsivo */
header {
    background: #1976d2;
    color: #fff;
    padding: 0.8rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-left: 1rem;
}

.logo-icon {
    font-size: 1.8rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: normal;
}

nav {
    margin-right: 1rem;
    display: flex;
    gap: 0.5rem;
}

nav button {
    background: transparent;
    border: none;
    color: #fff;
    font-size: 0.9rem;
    padding: 0.5rem 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 6px;
    min-height: 44px; /* Touch-friendly */
    min-width: 44px;
}

nav button:hover, nav button:focus {
    color: #ffd600;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

/* Main container otimizado para mobile */
main {
    max-width: 100%;
    margin: 0;
    background: #fff;
    min-height: calc(100vh - 80px);
    padding: 1rem 0.5rem 2rem 0.5rem;
    overflow-x: hidden;
}

section {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: 0 0.5rem;
}

h1, h2 {
    margin-bottom: 1rem;
    color: #1976d2;
    text-align: center;
    word-wrap: break-word;
}

/* Home hero otimizado */
.home-hero {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1rem 0;
}

.hero-logo {
    margin-bottom: 1.5rem;
}

.vitruvian-man {
    font-size: 3.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.benefits {
    list-style: none;
    padding: 0;
    margin-bottom: 1.5rem;
    width: 100%;
}

.benefits li {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    padding: 0.8rem;
    border-bottom: 1px solid rgba(25, 118, 210, 0.1);
    border-radius: 8px;
    background: rgba(25, 118, 210, 0.02);
}

/* Botões touch-friendly */
button {
    background: #1976d2;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.8rem 1.2rem;
    font-size: 1rem;
    margin: 0.5rem 0;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(25,118,210,0.15);
    min-height: 48px; /* Touch-friendly */
    min-width: 48px;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

button:hover, button:focus {
    background: #1565c0;
    outline: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(25,118,210,0.25);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(25,118,210,0.2);
}

/* Efeito de ripple para botões */
button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

button:active::after {
    width: 200px;
    height: 200px;
}

.auth-links {
    display: flex;
    gap: 0.8rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.auth-container {
    width: 100%;
    max-width: 350px;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.auth-container form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.auth-container input {
    padding: 0.8rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s;
    background: #fafafa;
    min-height: 48px;
}

.auth-container input:focus {
    border-color: #1976d2;
    outline: none;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

/* Quiz otimizado para mobile */
#quizQuestion {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    text-align: center;
    line-height: 1.4;
    padding: 0 0.5rem;
    font-weight: 500;
}

#quizOptions {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    width: 100%;
    margin-bottom: 1.5rem;
}

#quizOptions button {
    background: #f8f9fa;
    color: #333;
    border: 2px solid #e9ecef;
    font-weight: 500;
    text-align: left;
    padding: 1rem;
    border-radius: 10px;
    transition: all 0.2s ease;
    position: relative;
    min-height: 60px;
}

#quizOptions button:hover {
    background: #e3f2fd;
    border-color: #1976d2;
    color: #1976d2;
}

#quizOptions button.selected {
    background: #1976d2;
    color: #fff;
    border-color: #1976d2;
    transform: scale(1.02);
}

/* Animações de feedback melhoradas */
@keyframes blinkCorrect {
    0%, 100% { 
        background: #4caf50; 
        color: white; 
        transform: scale(1); 
        box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
    }
    25%, 75% { 
        background: #66bb6a; 
        color: white; 
        transform: scale(1.02); 
        box-shadow: 0 6px 16px rgba(76, 175, 80, 0.4);
    }
    50% { 
        background: #81c784; 
        color: white; 
        transform: scale(1.05); 
        box-shadow: 0 8px 20px rgba(76, 175, 80, 0.5);
    }
}

@keyframes blinkIncorrect {
    0%, 100% { 
        background: #f44336; 
        color: white; 
        transform: scale(1); 
        box-shadow: 0 4px 12px rgba(244, 67, 54, 0.3);
    }
    25%, 75% { 
        background: #ef5350; 
        color: white; 
        transform: scale(1.02); 
        box-shadow: 0 6px 16px rgba(244, 67, 54, 0.4);
    }
    50% { 
        background: #e57373; 
        color: white; 
        transform: scale(1.05); 
        box-shadow: 0 8px 20px rgba(244, 67, 54, 0.5);
    }
}

@keyframes vibrate {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-2px); }
    20%, 40%, 60%, 80% { transform: translateX(2px); }
}

.button-correct {
    animation: blinkCorrect 0.6s ease-in-out;
}

.button-incorrect {
    animation: blinkIncorrect 0.6s ease-in-out;
}

#quizFeedback {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.explanation-box {
    background: #f8f9fa;
    border-left: 4px solid #1976d2;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 8px;
    font-size: 0.95rem;
    line-height: 1.5;
    text-align: left;
}

.quiz-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Menu otimizado para mobile */
.menu-header {
    width: 100%;
    margin-bottom: 2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    color: white;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.user-avatar {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.user-details h2 {
    margin: 0;
    font-size: 1.3rem;
    color: white;
    font-weight: 600;
}

.user-status {
    margin: 0.3rem 0 0 0;
    opacity: 0.9;
    font-size: 0.9rem;
}

.menu-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    width: 100%;
    margin-bottom: 2rem;
}

.menu-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
    min-height: 80px;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

.menu-card:hover::before {
    left: 100%;
}

.menu-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: #1976d2;
}

.menu-card:active {
    transform: translateY(0);
}

.card-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.card-content {
    flex: 1;
}

.card-content h3 {
    margin: 0 0 0.3rem 0;
    font-size: 1.1rem;
    color: #333;
    font-weight: 600;
}

.card-content p {
    margin: 0;
    font-size: 0.9rem;
    color: #666;
    line-height: 1.3;
}

.card-arrow {
    font-size: 1.5rem;
    color: #1976d2;
    transition: transform 0.2s ease;
}

.menu-card:hover .card-arrow {
    transform: translateX(3px);
}

.logout-card {
    border-color: #ff6b6b;
}

.logout-card .card-icon {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
}

.logout-card .card-content h3 {
    color: #d32f2f;
}

.logout-card .card-arrow {
    color: #d32f2f;
}

.menu-footer {
    width: 100%;
    margin-top: auto;
}

.quick-stats {
    display: flex;
    justify-content: space-around;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid #e9ecef;
}

.stat-item {
    text-align: center;
    flex: 1;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: bold;
    color: #1976d2;
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.8rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* Categorias otimizadas */
.category-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    width: 100%;
    margin-bottom: 2rem;
}

.category-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    gap: 1rem;
    min-height: 100px;
}

.category-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: #1976d2;
}

.category-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

.category-content {
    flex: 1;
}

.category-content h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.2rem;
    color: #333;
    font-weight: 600;
}

.category-content p {
    margin: 0 0 0.8rem 0;
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
}

.category-stats {
    display: flex;
    gap: 0.8rem;
    align-items: center;
    flex-wrap: wrap;
}

.category-stats .stat {
    background: #e3f2fd;
    color: #1976d2;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
}

.difficulty-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-facil {
    background: #e8f5e8;
    color: #2e7d32;
}

.difficulty-medio {
    background: #fff3e0;
    color: #f57c00;
}

.difficulty-dificil {
    background: #ffebee;
    color: #c62828;
}

/* Quiz header otimizado */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

.quiz-header h2 {
    margin: 0;
    font-size: 1.1rem;
    color: #333;
    font-weight: 600;
}

.quiz-progress {
    background: #1976d2;
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(25, 118, 210, 0.3);
}

/* Progress bar melhorada */
.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    margin-bottom: 1.5rem;
    padding: 0 0.5rem;
}

.progress-bar {
    flex: 1;
    height: 10px;
    background: #e3f2fd;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4caf50 0%, #8bc34a 50%, #cddc39 100%);
    border-radius: 5px;
    transition: width 0.5s ease;
    width: 10%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.progress-text {
    min-width: 50px;
    text-align: center;
    font-weight: bold;
    color: #1976d2;
    font-size: 0.85rem;
}

/* Imagem do quiz otimizada */
.quiz-image-container {
    width: 100%;
    margin-bottom: 1.5rem;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    padding: 0 0.5rem;
}

#quizImage {
    max-width: 100%;
    max-height: 250px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border: 3px solid #e3f2fd;
    object-fit: contain;
    margin: 0 auto;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #fff;
}

#quizImage:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.2);
}

/* Modal otimizado para mobile */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    margin: auto;
    padding: 1rem;
    width: 95%;
    height: 95%;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: #fff;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.close-modal:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

#modalImage {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* Mensagens e feedback */
#messageContainer {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: #4caf50;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    opacity: 0;
    transition: opacity 0.3s ease;
    max-width: 90%;
    text-align: center;
}

#messageContainer.show {
    opacity: 1;
}

#statsContent {
    width: 100%;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid #e9ecef;
}

/* Media queries otimizadas */
@media (max-width: 480px) {
    header {
        padding: 0.6rem 0;
    }
    
    .logo {
        margin-left: 0.8rem;
        gap: 0.5rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
    
    .logo-title {
        font-size: 1rem;
    }
    
    .logo-subtitle {
        font-size: 0.7rem;
    }
    
    nav {
        margin-right: 0.8rem;
        gap: 0.3rem;
    }
    
    nav button {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
        min-height: 40px;
        min-width: 40px;
    }
    
    main {
        padding: 0.8rem 0.3rem 1.5rem 0.3rem;
    }
    
    section {
        padding: 0 0.3rem;
    }
    
    .vitruvian-man {
        width: 80px;
        height: 80px;
        font-size: 3rem;
    }
    
    .benefits li {
        font-size: 0.95rem;
        padding: 0.7rem;
    }
    
    button {
        padding: 0.9rem 1.1rem;
        font-size: 0.95rem;
        min-height: 52px;
    }
    
    .auth-container {
        padding: 1.2rem;
        margin: 0 0.5rem;
    }
    
    .auth-container input {
        padding: 0.9rem;
        font-size: 1rem;
        min-height: 52px;
    }
    
    .user-info {
        padding: 1.2rem;
        flex-direction: column;
        text-align: center;
        gap: 0.8rem;
    }
    
    .user-avatar {
        width: 70px;
        height: 70px;
        font-size: 3rem;
    }
    
    .user-details h2 {
        font-size: 1.2rem;
    }
    
    .menu-card {
        padding: 1.2rem;
        min-height: 70px;
    }
    
    .card-icon {
        width: 45px;
        height: 45px;
        font-size: 1.6rem;
    }
    
    .card-content h3 {
        font-size: 1rem;
    }
    
    .card-content p {
        font-size: 0.85rem;
    }
    
    .quick-stats {
        padding: 1.2rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .stat-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.5rem 0;
        border-bottom: 1px solid #e9ecef;
    }
    
    .stat-item:last-child {
        border-bottom: none;
    }
    
    .stat-number {
        font-size: 1.5rem;
        margin-bottom: 0;
    }
    
    .category-card {
        padding: 1.2rem;
        min-height: 90px;
    }
    
    .category-icon {
        width: 60px;
        height: 60px;
        font-size: 2.2rem;
    }
    
    .category-content h3 {
        font-size: 1.1rem;
    }
    
    .category-content p {
        font-size: 0.85rem;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .quiz-header h2 {
        font-size: 1rem;
    }
    
    .quiz-progress {
        font-size: 0.8rem;
        padding: 0.3rem 0.7rem;
    }
    
    #quizQuestion {
        font-size: 1rem;
        padding: 0 0.3rem;
    }
    
    #quizOptions button {
        padding: 1.2rem;
        min-height: 65px;
        font-size: 0.95rem;
    }
    
    .progress-container {
        padding: 0 0.3rem;
    }
    
    .progress-bar {
        height: 8px;
    }
    
    .progress-text {
        font-size: 0.8rem;
        min-width: 45px;
    }
    
    .quiz-image-container {
        min-height: 180px;
        padding: 0 0.3rem;
    }
    
    #quizImage {
        max-height: 220px;
    }
    
    .modal-content {
        padding: 0.8rem;
        width: 98%;
        height: 98%;
    }
    
    .close-modal {
        top: 0.8rem;
        right: 0.8rem;
        width: 45px;
        height: 45px;
        font-size: 1.8rem;
    }
    
    .explanation-box {
        font-size: 0.9rem;
        padding: 0.9rem;
    }
    
    .quiz-controls {
        gap: 0.8rem;
        margin-top: 1.2rem;
    }
}

@media (max-width: 600px) {
    main {
        max-width: 100%;
        margin: 0;
        border-radius: 0;
    }
    
    .logo-title {
        font-size: 1rem;
    }
    
    .logo-subtitle {
        font-size: 0.7rem;
    }
    
    .vitruvian-man {
        width: 85px;
        height: 85px;
        font-size: 3.2rem;
    }
    
    .quiz-header h2 {
        font-size: 1.05rem;
    }
    
    .quiz-progress {
        font-size: 0.85rem;
        min-width: 50px;
        padding: 0.3rem 0.6rem;
    }
}

/* Melhorias de acessibilidade */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Suporte para dark mode */
@media (prefers-color-scheme: dark) {
    body {
        background: #1a1a1a;
        color: #e0e0e0;
    }
    
    main {
        background: #2d2d2d;
    }
    
    .menu-card, .category-card, .auth-container {
        background: #3d3d3d;
        border-color: #4d4d4d;
    }
    
    .user-info {
        background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    }
    
    .quick-stats {
        background: #3d3d3d;
        border-color: #4d4d4d;
    }
    
    .auth-container input {
        background: #3d3d3d;
        border-color: #4d4d4d;
        color: #e0e0e0;
    }
    
    .auth-container input:focus {
        background: #4d4d4d;
    }
    
    #quizOptions button {
        background: #3d3d3d;
        border-color: #4d4d4d;
        color: #e0e0e0;
    }
    
    .explanation-box {
        background: #3d3d3d;
        border-color: #4d4d4d;
    }
    
    .quiz-header {
        background: #3d3d3d;
        border-color: #4d4d4d;
    }
    
    .progress-bar {
        background: #4d4d4d;
    }
    
    #statsContent {
        background: #3d3d3d;
        border-color: #4d4d4d;
    }
}

/* Melhorias para telas muito pequenas */
@media (max-width: 360px) {
    .logo-title {
        font-size: 0.9rem;
    }
    
    .logo-subtitle {
        font-size: 0.65rem;
    }
    
    .vitruvian-man {
        width: 70px;
        height: 70px;
        font-size: 2.8rem;
    }
    
    button {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }
    
    .menu-card {
        padding: 1rem;
    }
    
    .card-icon {
        width: 40px;
        height: 40px;
        font-size: 1.4rem;
    }
    
    .category-card {
        padding: 1rem;
    }
    
    .category-icon {
        width: 55px;
        height: 55px;
        font-size: 2rem;
    }
}

/* Orientação landscape em mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .vitruvian-man {
        width: 60px;
        height: 60px;
        font-size: 2.5rem;
    }
    
    .user-info {
        flex-direction: row;
        text-align: left;
    }
    
    .user-avatar {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }
    
    .menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quick-stats {
        flex-direction: row;
    }
    
    .stat-item {
        border-bottom: none;
        border-right: 1px solid #e9ecef;
        padding: 0 1rem;
    }
    
    .stat-item:last-child {
        border-right: none;
    }
} 

/* Menu de contexto mobile */
.mobile-context-menu {
    position: fixed;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    z-index: 1000;
    padding: 8px 0;
    min-width: 180px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.context-item {
    padding: 12px 16px;
    cursor: pointer;
    transition: background 0.2s ease;
    font-size: 14px;
    font-weight: 500;
    color: #333;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.context-item:last-child {
    border-bottom: none;
}

.context-item:hover {
    background: #f5f5f5;
}

.context-item:active {
    background: #e3f2fd;
}

/* Melhorias para feedback mobile */
.mobile-feedback {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 20px;
    border-radius: 25px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    z-index: 1000;
    font-size: 14px;
    font-weight: 600;
    color: white;
    opacity: 0;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.mobile-feedback.success {
    background: linear-gradient(135deg, #4caf50, #66bb6a);
}

.mobile-feedback.error {
    background: linear-gradient(135deg, #f44336, #ef5350);
}

/* Melhorias para orientação landscape */
@media (max-width: 768px) and (orientation: landscape) {
    .menu-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }
    
    .quick-stats {
        flex-direction: row;
        padding: 1rem;
    }
    
    .stat-item {
        border-bottom: none;
        border-right: 1px solid #e9ecef;
        padding: 0 1rem;
    }
    
    .stat-item:last-child {
        border-right: none;
    }
    
    .user-info {
        flex-direction: row;
        text-align: left;
        padding: 1rem;
    }
    
    .user-avatar {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }
    
    .vitruvian-man {
        width: 60px;
        height: 60px;
        font-size: 2.5rem;
    }
    
    .quiz-image-container {
        min-height: 150px;
    }
    
    #quizImage {
        max-height: 180px;
    }
}

/* Melhorias para telas muito pequenas */
@media (max-width: 320px) {
    .logo-title {
        font-size: 0.85rem;
    }
    
    .logo-subtitle {
        font-size: 0.6rem;
    }
    
    .vitruvian-man {
        width: 60px;
        height: 60px;
        font-size: 2.2rem;
    }
    
    button {
        padding: 0.7rem 0.9rem;
        font-size: 0.85rem;
        min-height: 48px;
    }
    
    .menu-card {
        padding: 0.8rem;
        min-height: 60px;
    }
    
    .card-icon {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }
    
    .card-content h3 {
        font-size: 0.9rem;
    }
    
    .card-content p {
        font-size: 0.75rem;
    }
    
    .category-card {
        padding: 0.8rem;
        min-height: 80px;
    }
    
    .category-icon {
        width: 45px;
        height: 45px;
        font-size: 1.8rem;
    }
    
    .category-content h3 {
        font-size: 1rem;
    }
    
    .category-content p {
        font-size: 0.8rem;
    }
    
    #quizQuestion {
        font-size: 0.9rem;
        padding: 0 0.2rem;
    }
    
    #quizOptions button {
        padding: 1rem;
        min-height: 55px;
        font-size: 0.9rem;
    }
    
    .explanation-box {
        font-size: 0.85rem;
        padding: 0.8rem;
    }
}

/* Melhorias para acessibilidade em mobile */
@media (max-width: 768px) {
    /* Aumentar contraste para melhor visibilidade */
    button {
        border: 2px solid transparent;
    }
    
    button:focus {
        border-color: #1976d2;
        outline: none;
        box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.3);
    }
    
    input:focus {
        border-color: #1976d2;
        box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.2);
    }
    
    /* Melhorar legibilidade do texto */
    .explanation-box {
        line-height: 1.6;
        font-size: 0.95rem;
    }
    
    /* Melhorar contraste dos botões do quiz */
    #quizOptions button {
        border: 2px solid #e9ecef;
        background: #ffffff;
        color: #333;
    }
    
    #quizOptions button:hover {
        border-color: #1976d2;
        background: #e3f2fd;
        color: #1976d2;
    }
    
    #quizOptions button.selected {
        border-color: #1976d2;
        background: #1976d2;
        color: white;
    }
    
    /* Melhorar feedback visual */
    .button-correct {
        border-color: #4caf50 !important;
        background: #4caf50 !important;
        color: white !important;
        box-shadow: 0 4px 12px rgba(76, 175, 80, 0.4) !important;
    }
    
    .button-incorrect {
        border-color: #f44336 !important;
        background: #f44336 !important;
        color: white !important;
        box-shadow: 0 4px 12px rgba(244, 67, 54, 0.4) !important;
    }
}

/* Melhorias para performance em mobile */
@media (max-width: 768px) {
    /* Reduzir sombras complexas */
    .menu-card, .category-card {
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }
    
    .menu-card:hover, .category-card:hover {
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    
    /* Simplificar gradientes */
    .user-info {
        background: #667eea;
    }
    
    .card-icon {
        background: #667eea;
    }
    
    .category-icon {
        background: #667eea;
    }
    
    /* Otimizar animações */
    .vitruvian-man {
        animation: pulse 3s infinite;
    }
    
    @keyframes pulse {
        0% { transform: scale(1); }
        50% { transform: scale(1.03); }
        100% { transform: scale(1); }
    }
}

/* Melhorias para dark mode em mobile */
@media (prefers-color-scheme: dark) and (max-width: 768px) {
    .mobile-context-menu {
        background: #2d2d2d;
        border-color: #4d4d4d;
    }
    
    .context-item {
        color: #e0e0e0;
        border-bottom-color: #4d4d4d;
    }
    
    .context-item:hover {
        background: #3d3d3d;
    }
    
    .context-item:active {
        background: #4a5568;
    }
    
    .mobile-feedback {
        border-color: rgba(255,255,255,0.1);
    }
}

/* Melhorias para preferência de movimento reduzido */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .vitruvian-man {
        animation: none;
    }
    
    .menu-card:hover, .category-card:hover {
        transform: none;
    }
    
    .mobile-feedback {
        transition: opacity 0.1s ease;
    }
}