:root {
    /* Light theme variables */
    --bg-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-secondary: white;
    --bg-tertiary: linear-gradient(135deg, #f8f9ff, #f0f2ff);
    --text-primary: #333;
    --text-secondary: #2c3e50;
    --text-accent: #667eea;
    --border-color: #eee;
    --shadow: rgba(0,0,0,0.1);
    --shadow-strong: rgba(0,0,0,0.2);
}

[data-theme="dark"] {
    /* Dark theme variables */
    --bg-primary: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    --bg-secondary: #34495e;
    --bg-tertiary: linear-gradient(135deg, #2c3e50, #34495e);
    --text-primary: #ffffff;
    --text-secondary: #ffffff;
    --text-accent: #74b9ff;
    --border-color: #4a5568;
    --shadow: rgba(0,0,0,0.3);
    --shadow-strong: rgba(0,0,0,0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

h1 {
    color: white;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    flex: 1;
    min-width: 250px;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.theme-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-icon {
    transform: rotate(180deg);
}

.nav-tabs {
    display: flex;
    justify-content: center;
    gap: clamp(5px, 2vw, 10px);
    margin-bottom: 30px;
    flex-wrap: wrap;
    padding: 0 10px;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: clamp(8px, 2vw, 12px) clamp(12px, 3vw, 24px);
    border-radius: 25px;
    cursor: pointer;
    font-size: clamp(0.8rem, 2vw, 1rem);
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    flex: 1;
    min-width: 80px;
    max-width: 150px;
    white-space: nowrap;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.tab-content {
    display: none;
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: clamp(15px, 4vw, 30px);
    box-shadow: 0 10px 30px var(--shadow-strong);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease-in;
}

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

h2 {
    color: var(--text-accent);
    font-size: clamp(1.2rem, 4vw, 2rem);
    margin-bottom: 25px;
    text-align: center;
    border-bottom: 3px solid var(--text-accent);
    padding-bottom: 10px;
}

.table-container {
    overflow-x: auto;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow);
    -webkit-overflow-scrolling: touch;
}

.verb-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    border-radius: 15px;
    overflow: hidden;
    font-size: clamp(0.75rem, 2.5vw, 1rem);
    min-width: 100%;
}

.verb-table thead {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.verb-table th,
.verb-table td {
    padding: clamp(6px, 1.5vw, 15px) clamp(8px, 2vw, 20px);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.verb-table th {
    font-weight: 600;
    font-size: 1.1rem;
}

.verb-table tbody tr {
    transition: all 0.3s ease;
}

.verb-table tbody tr:hover {
    background: var(--bg-tertiary);
    transform: scale(1.01);
}

.verb-name {
    font-weight: 700;
    color: var(--text-accent);
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
}

.verb-table td:nth-child(2),
.verb-table td:nth-child(3) {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text-secondary);
}

.examples {
    background: var(--bg-tertiary);
    padding: clamp(15px, 4vw, 25px);
    border-radius: 15px;
    border-left: 5px solid var(--text-accent);
}

.examples h3 {
    color: var(--text-accent);
    margin-bottom: 15px;
    font-size: clamp(1rem, 3vw, 1.3rem);
}

.examples ul {
    list-style: none;
}

.examples li {
    margin-bottom: 10px;
    padding: clamp(8px, 2vw, 10px);
    background: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--shadow);
    transition: transform 0.2s ease;
    color: var(--text-secondary);
    font-size: clamp(0.85rem, 2vw, 1rem);
}

.examples li:hover {
    transform: translateX(10px);
}

.examples strong {
    color: #e74c3c;
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: white;
    font-size: 1.1rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.version {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 10px;
    font-style: italic;
}

/* Styles par défaut pour les cartes mobiles */
.mobile-cards {
    display: none;
}

/* Desktop - Afficher les tableaux */
@media (min-width: 769px) {
    .verb-table {
        display: table;
    }
    
    .mobile-cards {
        display: none !important;
    }
}

/* Mobile-First Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 5px;
    }
    
    .header-top {
        justify-content: center;
        text-align: center;
    }
    
    h1 {
        min-width: auto;
        margin-bottom: 10px;
        font-size: clamp(1.2rem, 5vw, 2rem);
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
    }
    
    .nav-tabs {
        gap: 5px;
        margin-bottom: 15px;
    }
    
    .tab-btn {
        min-width: 70px;
        max-width: 90px;
        font-size: 0.7rem;
        padding: 8px 10px;
    }
    
    .tab-content {
        padding: 8px;
    }
    
    /* Tableau responsive avec cartes */
    .table-container {
        margin: 0;
        border-radius: 8px;
        overflow: visible;
    }
    
    .verb-table {
        display: none !important; /* Cacher le tableau sur mobile */
    }
    
    /* Affichage en cartes sur mobile */
    .mobile-cards {
        display: block !important;
    }
    
    .verb-card {
        background: var(--bg-secondary);
        border-radius: 10px;
        padding: 15px;
        margin-bottom: 15px;
        box-shadow: 0 3px 10px var(--shadow);
        border-left: 4px solid var(--text-accent);
    }
    
    .verb-card-header {
        font-size: 1.1rem;
        font-weight: bold;
        color: var(--text-accent);
        margin-bottom: 10px;
        text-align: center;
    }
    
    .verb-card-content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        font-size: 0.9rem;
    }
    
    .verb-info {
        display: flex;
        flex-direction: column;
    }
    
    .verb-label {
        font-weight: 600;
        color: var(--text-accent);
        font-size: 0.8rem;
        margin-bottom: 2px;
    }
    
    .verb-value {
        font-family: 'Courier New', monospace;
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .verb-translation {
        grid-column: 1 / -1;
        text-align: center;
        margin-top: 8px;
        padding-top: 8px;
        border-top: 1px solid var(--border-color);
        font-style: italic;
        color: var(--text-secondary);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 3px;
    }
    
    .header-top {
        flex-direction: column;
        gap: 8px;
    }
    
    .nav-tabs {
        flex-direction: column;
        gap: 4px;
        padding: 0;
    }
    
    .tab-btn {
        width: 100%;
        max-width: none;
        margin: 0;
        padding: 10px 12px;
        font-size: 0.8rem;
    }
    
    .tab-content {
        padding: 8px;
        border-radius: 8px;
    }
    
    .verb-card {
        padding: 12px;
        margin-bottom: 10px;
    }
    
    .verb-card-header {
        font-size: 1rem;
    }
    
    .verb-card-content {
        font-size: 0.85rem;
        gap: 8px;
    }
    
    .quiz-header {
        padding: 10px;
        flex-direction: column;
        gap: 10px;
    }
    
    .score-display {
        flex-direction: row;
        justify-content: space-around;
        gap: 12px;
        font-size: 0.85rem;
    }
    
    .quiz-question {
        padding: 12px;
    }
    
    #question-text {
        font-size: 0.95rem;
        margin-bottom: 12px;
    }
    
    .quiz-options {
        gap: 6px;
    }
    
    .option-btn {
        padding: 8px 10px;
        font-size: 0.8rem;
    }
    
    .quiz-instructions {
        padding: 10px;
    }
    
    .step {
        padding: 5px;
        flex-direction: column;
        text-align: center;
        gap: 4px;
    }
    
    .step-number {
        margin-right: 0;
        margin-bottom: 4px;
        width: 20px;
        height: 20px;
        font-size: 0.7rem;
    }
    
    .examples {
        padding: 10px;
    }
    
    .examples li {
        padding: 6px;
        font-size: 0.8rem;
    }
}

/* Très petits écrans */
@media (max-width: 320px) {
    .container {
        padding: 2px;
    }
    
    .tab-content {
        padding: 6px;
    }
    
    .verb-card {
        padding: 10px;
        margin-bottom: 8px;
    }
    
    .verb-card-header {
        font-size: 0.9rem;
    }
    
    .verb-card-content {
        font-size: 0.8rem;
        gap: 6px;
    }
    
    .examples li {
        font-size: 0.75rem;
        padding: 5px;
    }
    
    .quiz-question {
        padding: 8px;
    }
    
    #question-text {
        font-size: 0.85rem;
    }
    
    .option-btn {
        padding: 6px 8px;
        font-size: 0.75rem;
    }
    
    h1 {
        font-size: clamp(1rem, 6vw, 1.5rem);
    }
}

/* Quiz Styles */
.quiz-btn {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24) !important;
    color: white !important;
    border: 2px solid rgba(255, 107, 107, 0.3) !important;
}

.quiz-btn:hover {
    background: linear-gradient(135deg, #ff5252, #d63031) !important;
}

.quiz-btn.active {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24) !important;
    color: white !important;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4) !important;
}

.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: 15px;
    border-left: 5px solid var(--text-accent);
}

.score-display {
    display: flex;
    gap: 20px;
}

.score, .streak {
    font-weight: 600;
    color: var(--text-accent);
}

.quiz-control-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.quiz-control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.quiz-question {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow);
    margin-bottom: 20px;
    text-align: center;
}

#question-text {
    font-size: 1.3rem;
    margin-bottom: 25px;
    color: var(--text-secondary);
    font-weight: 600;
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.option-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--text-accent);
    padding: 15px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-accent);
    transition: all 0.3s ease;
}

.option-btn:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
}

.option-btn.correct {
    background: linear-gradient(135deg, #00b894, #00a085);
    color: white;
    border-color: #00b894;
}

.option-btn.incorrect {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border-color: #e74c3c;
}

.quiz-feedback {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow);
    text-align: center;
    margin-bottom: 20px;
}

.quiz-feedback.hidden {
    display: none;
}

.quiz-feedback.correct {
    border-left: 5px solid #00b894;
    background: var(--bg-tertiary);
}

.quiz-feedback.incorrect {
    border-left: 5px solid #e74c3c;
    background: var(--bg-tertiary);
}

#feedback-text {
    font-size: 1.1rem;
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--text-secondary);
}

.quiz-stats {
    display: flex;
    justify-content: space-around;
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: 15px;
    border-left: 5px solid var(--text-accent);
}

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

.stat-label {
    display: block;
    color: var(--text-accent);
    font-weight: 600;
    margin-bottom: 5px;
}

.stat-item span:last-child {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-secondary);
}

/* Styles pour les instructions du quiz */
.quiz-instructions {
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: 15px;
    border-left: 5px solid #f39c12;
    margin-top: 20px;
}

.quiz-instructions h3 {
    color: var(--text-accent);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.instruction-steps {
    margin-bottom: 15px;
}

.step {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.step-number {
    background: #e67e22;
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 12px;
    font-size: 0.9rem;
}

.step-text {
    flex: 1;
    color: var(--text-secondary);
}

.quiz-tip {
    background: var(--bg-secondary);
    padding: 12px;
    border-radius: 8px;
    color: var(--text-accent);
    font-style: italic;
    margin: 0;
}

/* Styles pour la page Verbes du Quiz */
.quiz-verbs-intro {
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    text-align: center;
}

.quiz-verbs-intro p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0;
}

.difficulty-section {
    margin-bottom: 40px;
    padding: 25px;
    border-radius: 15px;
    border-left: 5px solid;
}

.difficulty-section.easy {
    background: var(--bg-tertiary);
    border-left-color: #00b894;
}

.difficulty-section.medium {
    background: var(--bg-tertiary);
    border-left-color: #fdcb6e;
}

.difficulty-section.hard {
    background: var(--bg-tertiary);
    border-left-color: #e74c3c;
}

.difficulty-section h3 {
    color: var(--text-accent);
    margin-bottom: 10px;
    font-size: 1.4rem;
}

.difficulty-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-style: italic;
}

.verbs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.verb-detail-card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow);
    border-left: 4px solid var(--text-accent);
}

.verb-detail-card h4 {
    color: var(--text-accent);
    margin-bottom: 15px;
    font-size: 1.2rem;
    text-align: center;
}

.conjugations {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tense-group {
    color: var(--text-secondary);
    padding: 8px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.9rem;
}

.tense-group strong {
    color: var(--text-accent);
}

.verbs-compact-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.verb-compact-card {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 3px 8px var(--shadow);
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-left: 3px solid var(--text-accent);
}

.verb-compact-card strong {
    color: var(--text-accent);
}

.quiz-tips {
    background: var(--bg-tertiary);
    padding: 25px;
    border-radius: 15px;
    border-left: 5px solid #74b9ff;
    margin-top: 30px;
}

.quiz-tips h3 {
    color: var(--text-accent);
    margin-bottom: 15px;
}

.quiz-tips ul {
    list-style: none;
    padding: 0;
}

.quiz-tips li {
    color: var(--text-secondary);
    margin-bottom: 12px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 8px;
    position: relative;
    padding-left: 30px;
}

.quiz-tips li::before {
    content: "💡";
    position: absolute;
    left: 8px;
    top: 10px;
}

.quiz-tips strong {
    color: var(--text-accent);
}

@media (max-width: 768px) {
    .verbs-grid {
        grid-template-columns: 1fr;
    }
    
    .verbs-compact-list {
        grid-template-columns: 1fr;
    }
    
    .verb-detail-card {
        padding: 15px;
    }
    
    .difficulty-section {
        padding: 15px;
        margin-bottom: 25px;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .score-display {
        justify-content: center;
    }
    
    .quiz-options {
        grid-template-columns: 1fr;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .quiz-instructions {
        padding: 15px;
    }
    
    .quiz-instructions h3 {
        font-size: 1.1rem;
    }
    
    .step {
        padding: 8px;
    }
    
    .step-number {
        width: 22px;
        height: 22px;
        font-size: 0.8rem;
    }
    
    .step-text {
        font-size: 0.9rem;
    }
}