/* Variables CSS pour les thèmes */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    --calculator-bg: #ffffff;
    --button-bg: #f8f9fa;
    --button-hover: #e9ecef;
    --display-bg: #f8f9fa;
}

/* Thème sombre */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
    
    --calculator-bg: #2d2d2d;
    --button-bg: #404040;
    --button-hover: #505050;
    --display-bg: #1a1a1a;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: all 0.3s ease;
}

.calculator-container {
    background: var(--calculator-bg);
    border-radius: 20px;
    box-shadow: 0 20px 40px var(--shadow-color);
    overflow: hidden;
    width: 400px;
    max-width: 95vw;
}

/* Header */
.calculator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.mode-switch {
    display: flex;
    gap: 5px;
}

.mode-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    background: var(--button-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.mode-btn.active {
    background: var(--primary-color);
    color: white;
}

.theme-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: var(--button-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 18px;
}

.theme-btn:hover {
    background: var(--button-hover);
    transform: scale(1.1);
}

/* Affichage */
.display-container {
    padding: 20px;
    background: var(--display-bg);
}

.history-display {
    min-height: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-align: right;
}

#display {
    width: 100%;
    height: 60px;
    border: none;
    background: transparent;
    font-size: 2.5em;
    text-align: right;
    color: var(--text-primary);
    outline: none;
}

/* Boutons mémoire */
.memory-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    padding: 10px 20px;
}

.memory-btn {
    padding: 10px;
    border: none;
    border-radius: 10px;
    background: var(--info-color);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: bold;
}

.memory-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(23, 162, 184, 0.3);
}

/* Boutons principaux */
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    padding: 20px;
}

.number-btn, .operator-btn, .function-btn, .equals-btn {
    padding: 20px;
    border: none;
    border-radius: 15px;
    font-size: 1.5em;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.number-btn {
    background: var(--button-bg);
    color: var(--text-primary);
}

.number-btn:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
}

.zero-btn {
    grid-column: span 2;
}

.operator-btn {
    background: var(--warning-color);
    color: var(--dark-color);
}

.operator-btn:hover {
    background: #e0a800;
    transform: translateY(-2px);
}

.function-btn {
    background: var(--secondary-color);
    color: white;
}

.function-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.clear-btn {
    background: var(--danger-color);
}

.clear-btn:hover {
    background: #c82333;
}

.equals-btn {
    background: var(--success-color);
    color: white;
}

.equals-btn:hover {
    background: #218838;
    transform: translateY(-2px);
}

/* Boutons scientifiques */
.scientific-buttons {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.scientific-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    margin-bottom: 10px;
}

.scientific-btn {
    padding: 15px;
    border: none;
    border-radius: 10px;
    background: var(--info-color);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: bold;
}

.scientific-btn:hover {
    background: #138496;
    transform: translateY(-2px);
}

/* Historique */
.history-panel {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

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

.history-header h3 {
    color: var(--text-primary);
    font-size: 18px;
}

.clear-history-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    background: var(--danger-color);
    color: white;
    cursor: pointer;
    font-size: 12px;
}

.history-list {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 15px;
}

.history-item {
    padding: 10px;
    background: var(--button-bg);
    border-radius: 8px;
    margin-bottom: 5px;
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.3s ease;
}

.history-item:hover {
    background: var(--button-hover);
}

.export-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: var(--success-color);
    color: white;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.export-btn:hover {
    background: #218838;
    transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 480px) {
    .calculator-container {
        width: 95vw;
        margin: 10px;
    }
    
    .buttons {
        gap: 3px;
        padding: 15px;
    }
    
    .number-btn, .operator-btn, .function-btn, .equals-btn {
        padding: 15px;
        font-size: 1.2em;
    }
}

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

.calculator-container {
    animation: fadeIn 0.5s ease-out;
}

/* Scrollbar personnalisée */
.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}