/* ==========================================================================
   VARIABLES ET STYLES GLOBAUX
   ========================================================================== */

/* Variables de couleur inspirées de about.css */
:root {
    --primary-blue: #1a3a8f;        /* Bleu principal */
    --secondary-blue: #2c5aa0;      /* Bleu secondaire */
    --light-blue: #e8f4fd;          /* Bleu clair */
    --warning-yellow: #ffc107;      /* Jaune avertissement */
    --success-green: #28a745;       /* Vert succès */
    --dark-color: #343a40;          /* Texte foncé */
    --light-color: #f8f9fa;         /* Fond clair */
    --gray-color: #666;             /* Texte gris */
    --border-color: #e0e0e0;        /* Bordures */
    --white: #ffffff;
    --shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background-color: var(--white);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: 80px; /* Compensation navbar fixe */
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* ==========================================================================
   PRÉLOADER DYNAMIQUE
   ========================================================================== */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
    color: var(--white);
}

.preloader-content .spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.2rem;
    font-weight: 500;
    letter-spacing: 1px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* ==========================================================================
   NAVBAR DYNAMIQUE ET FLUIDE
   ========================================================================== */
.navbar {
    background-color: var(--white) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0.8rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1030;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95) !important;
}

.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-blue) !important;
    transition: transform 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.logo-text {
    margin-left: 10px;
    font-weight: bold;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Boutons de navigation */
.nav-right-item {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: var(--white) !important;
    border: none;
    border-radius: 8px;
    padding: 10px 20px !important;
    margin-left: 10px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-right-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.nav-right-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(26, 58, 143, 0.3);
}

.nav-right-item:hover::before {
    left: 100%;
}

.nav-right-item.active {
    background: var(--white);
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue);
}

/* Menu mobile */
.navbar-toggler {
    border: none;
    padding: 8px;
    transition: transform 0.3s ease;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler:hover {
    transform: rotate(90deg);
}

.navbar-collapse {
    transition: all 0.4s ease;
}

@media (max-width: 992px) {
    .navbar-collapse {
        background: var(--white);
        border-radius: 10px;
        margin-top: 15px;
        padding: 20px;
        box-shadow: var(--shadow);
    }
    
    .nav-right-item {
        margin: 5px 0;
        width: 100%;
        text-align: center;
    }
}

/* ==========================================================================
   CONTENEUR PRINCIPAL
   ========================================================================== */
.main-container {
    flex: 1;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    animation-delay: 0.3s;
    min-height: calc(100vh - 200px); /* Hauteur minimale */
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Conteneurs de contenu */
.content-box {
    background: var(--white);
    border-radius: 15px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.page-title {
    color: var(--primary-blue);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 15px;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue));
    border-radius: 2px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 3rem 0 1.5rem;
    margin-top: auto;
}

.footer-title {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1.2rem;
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--warning-yellow);
}

.footer p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--white);
    color: var(--primary-blue);
    transform: translateY(-3px);
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ==========================================================================
   TRANSITIONS ENTRE PAGES
   ========================================================================== */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    z-index: 9998;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-transition.active {
    transform: translateX(0);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }
    
    .main-container {
        padding: 15px;
    }
    
    .content-box {
        padding: 1.5rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .footer {
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-title::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.3rem;
    }
    
    .logo-text {
        display: none;
    }
    
    .nav-right-item {
        padding: 8px 15px !important;
        font-size: 0.9rem;
    }
}

/* ==========================================================================
   ANIMATIONS ET TRANSITIONS
   ========================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}