/* Reset et base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Variables CSS pour le mode clair */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: rgba(255, 255, 255, 0.95);
    --content-bg: rgba(255, 255, 255, 0.98);
    --text-color: #333;
    --text-secondary: #666;
    --input-bg: #fafafa;
    --input-focus-bg: #fff;
    --border-color: #e0e0e0;
    --primary-color: #2c5530;
    --primary-hover: #4a7c59;
    --success-bg: #d4edda;
    --success-border: #28a745;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-border: #dc3545;
    --error-text: #721c24;
    --shadow: rgba(0, 0, 0, 0.1);
    --footer-text: rgba(255, 255, 255, 0.8);
}

/* Mode sombre */
[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --container-bg: rgba(30, 30, 30, 0.95);
    --content-bg: rgba(25, 25, 25, 0.98);
    --text-color: #e0e0e0;
    --text-secondary: #b0b0b0;
    --input-bg: #2a2a2a;
    --input-focus-bg: #333;
    --border-color: #444;
    --primary-color: #4a7c59;
    --primary-hover: #5a8c69;
    --success-bg: #1e3a2e;
    --success-border: #28a745;
    --success-text: #a3d9a5;
    --error-bg: #3a1e1e;
    --error-border: #dc3545;
    --error-text: #f8a3a3;
    --shadow: rgba(0, 0, 0, 0.3);
    --footer-text: rgba(255, 255, 255, 0.7);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-gradient);
    min-height: 100vh;
    transition: all 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    background: var(--container-bg);
    padding: 40px 30px;
    border-radius: 15px 15px 0 0;
    box-shadow: 0 5px 20px var(--shadow);
    position: relative;
}

/* Bouton de basculement du thème */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px var(--shadow);
}

.theme-toggle:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
}

.logo {
    max-width: 150px;
    height: auto;
    margin-bottom: 20px;
    border-radius: 10px;
}

.header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* Main content */
.main-content {
    background: var(--content-bg);
    padding: 40px 30px;
    border-radius: 0 0 15px 15px;
    box-shadow: 0 5px 20px var(--shadow);
    flex: 1;
}

/* Alertes */
.alert {
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    border-left: 5px solid;
}

.alert-success {
    background-color: var(--success-bg);
    border-color: var(--success-border);
    color: var(--success-text);
}

.alert-error {
    background-color: var(--error-bg);
    border-color: var(--error-border);
    color: var(--error-text);
}

.alert h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

/* Formulaire */
.form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="email"] {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: var(--input-bg);
    color: var(--text-color);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--input-focus-bg);
    box-shadow: 0 0 0 3px rgba(44, 85, 48, 0.1);
}

.form-group input:valid {
    border-color: #28a745;
}

/* Checkbox personnalisée */
.checkbox-group {
    margin: 30px 0;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    font-size: 0.95rem;
    line-height: 1.5;
}

.checkbox-text {
    flex: 1;
}

.conditions-link {
    color: var(--primary-color);
    text-decoration: underline;
    transition: color 0.3s ease;
}

.conditions-link:hover {
    color: var(--primary-hover);
    text-decoration: none;
}

.form-note {
    display: block;
    margin-top: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-radius: 4px;
    margin-right: 12px;
    margin-top: 2px;
    flex-shrink: 0;
    position: relative;
    transition: all 0.3s ease;
    background-color: var(--input-bg);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: "✓";
    position: absolute;
    top: -2px;
    left: 3px;
    color: white;
    font-weight: bold;
    font-size: 14px;
}

/* Bouton de soumission */
.submit-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 18px 30px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(44, 85, 48, 0.3);
    margin-top: 20px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 85, 48, 0.4);
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-color) 100%);
}

.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(44, 85, 48, 0.3);
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 20px 20px;
    color: var(--footer-text);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header {
        padding: 30px 20px;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1rem;
        top: 15px;
        right: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 30px 20px;
    }
    
    .logo {
        max-width: 120px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.6rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .theme-toggle {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
        top: 10px;
        right: 10px;
    }
    
    .form-group input[type="text"],
    .form-group input[type="tel"],
    .form-group input[type="email"] {
        padding: 12px;
    }
    
    .submit-btn {
        padding: 15px 25px;
        font-size: 1rem;
    }
}

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

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

.form {
    animation: fadeIn 0.6s ease-out;
}

.alert {
    animation: fadeIn 0.4s ease-out;
}

/* Animation d'erreur */
.error-shake {
    animation: shake 0.5s ease-in-out;
}

/* États d'erreur */
.form-group input:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--error-border);
    background-color: var(--error-bg);
}

/* Focus visible pour l'accessibilité */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Transitions pour le mode sombre */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}