:root {
    /* Palette de couleurs principale */
    --primary-color: #018C8A;
    --primary-dark: #016b6a;
    --primary-light: #4FC3F7;
    
    --secondary-color: #2c3e50;
    --secondary-dark: #1a252f;
    
    --background-primary: #ffffff;
    --background-secondary: #f9f9f9;
    --background-gradient: linear-gradient(135deg, #e6f2f2, #ffffff);
    
    /* Couleurs de texte */
    --text-primary: #2c3e50;
    --text-secondary: #555;
    --text-light: #fff;
    --text-error: #d9534f;
    --text-success: #28a745;
    
    /* Couleurs des états */
    --border-color: #ccc;
    --border-color-focus: #018C8A;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-color: rgba(0, 0, 0, 0.5);
    
    /* Espacements */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-xxl: 40px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 5px var(--shadow-color);
    --shadow-md: 0 4px 12px var(--shadow-color);
    --shadow-lg: 0 8px 24px var(--shadow-color);
    
    /* Z-index */
    --z-dropdown: 10;
    --z-sticky: 1000;
    --z-modal: 2000;
    --z-overlay: 1999;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Layout principal */
.contenu {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Navigation sticky */
nav.sticky-nav {
    position: sticky;
    top: 0;
    background-color: var(--secondary-color);
    z-index: var(--z-sticky);
    padding: var(--spacing-sm) var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    color: var(--text-light);
    font-size: 1.25rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu li {
    list-style: none;
}

.nav-menu a {
    color: #ecf0f1;
    text-decoration: none;
    font-weight: 600;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-normal);
    display: inline-flex;
}

.nav-menu a:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
    text-decoration: none;
}

/* Hamburger menu pour mobile */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-light);
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* Formulaires */
form {
    background: var(--background-primary);
    backdrop-filter: blur(8px);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 700px;
}

form > div {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

label {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="time"],
input[type="number"],
input[type="file"],
select,
textarea {
    padding: 12px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--background-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--border-color-focus);
    outline: none;
    box-shadow: 0 0 0 3px rgba(1, 140, 138, 0.1);
}

input:disabled,
select:disabled,
textarea:disabled {
    background-color: #e9ecef;
    color: #6c757d;
    cursor: not-allowed;
}

/* Boutons */
button,
.btn,
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary,
button[type="submit"] {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-primary:hover,
button[type="submit"]:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-light);
}

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: #ffffff;
    text-decoration: none;
}

.btn-ajout {
    background-color: var(--primary-color);
    margin-bottom: 1em;
    color: var(--text-light);
    padding: var(--radius-sm);

}

.btn-ajout:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
    color: var(--text-light);
    text-decoration: none;
}

/* Tableaux */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-xl);
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(6px);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--primary-color);
    color: var(--text-light);
    font-weight: 600;
    text-align: center;
}

tr:hover {
    background-color: #f2fdfd;
}

td {
    text-align: center;
}

/* Container de défilement pour les tableaux */
.scroll-table-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: var(--spacing-lg);
}

.scroll-table-container table {
    min-width: 600px;
}

/* Messages */
.success-msg {
    background: #d4edda;
    color: #155724;
    padding: var(--spacing-md);
    border-left: 5px solid var(--text-success);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    animation: slideIn 0.3s ease;
}

.error-msg {
    background: #f8d7da;
    color: var(--text-error);
    padding: var(--spacing-md);
    border-left: 5px solid var(--text-error);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: #ecf0f1;
    text-align: center;
    padding: var(--spacing-md) 0;
    width: 100%;
    margin-top: auto;
}

footer a {
    color: var(--text-light);
    font-weight: 600;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        display: none;
        margin-top: var(--spacing-sm);
    }
    
    .nav-menu.show {
        display: flex;
    }
    
    .nav-menu a {
        width: 100%;
        text-align: left;
    }
    
    .contenu {
        padding: var(--spacing-sm);
    }
    
    form {
        padding: var(--spacing-lg);
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }
}

@media screen and (max-width: 480px) {
    .contenu {
        padding: var(--spacing-xs);
    }
    
    form {
        padding: var(--spacing-md);
    }
    
    button,
    .btn {
        width: 100%;
        justify-content: center;
    }
}