/* Styles globaux modernes pour Social Network Pro */

/* Variables CSS étendues */
:root {
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warning: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --gradient-danger: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    
    --text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --box-shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.1);
    --box-shadow-hard: 0 16px 64px rgba(0, 0, 0, 0.15);
}

/* Améliorations du body */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Container principal amélioré */
.social-container {
    position: relative;
    z-index: 1;
}

/* Header avec effet glassmorphism */
.social-header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
}

/* Logo avec animation */
.logo {
    position: relative;
    overflow: hidden;
}

.logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.logo:hover::before {
    left: 100%;
}

/* Sidebars avec effet glassmorphism */
.left-sidebar,
.right-sidebar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
}

/* Contenu principal avec effet glassmorphism */
.main-content {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
}

/* Formulaire de post amélioré */
.post-form {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
    position: relative;
    overflow: hidden;
}

.post-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s;
}

.post-form:hover::before {
    opacity: 1;
}

/* Posts avec effet glassmorphism */
.post {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
    position: relative;
    overflow: hidden;
}

.post::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s;
}

.post:hover::before {
    opacity: 1;
}

/* Boutons avec effets modernes */
.post-action-btn,
.post-action,
.filter-btn,
.load-more-btn {
    position: relative;
    overflow: hidden;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.post-action-btn::before,
.post-action::before,
.filter-btn::before,
.load-more-btn::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;
}

.post-action-btn:hover::before,
.post-action:hover::before,
.filter-btn:hover::before,
.load-more-btn:hover::before {
    left: 100%;
}

/* Bouton de publication spécial */
.post-action-btn:last-child {
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-weight: 700;
    text-shadow: var(--text-shadow);
}

.post-action-btn:last-child:hover {
    background: var(--gradient-secondary);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hard);
}

/* Filtres avec effet glassmorphism */
.feed-filters {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-md);
}

/* Bouton charger plus */
.load-more-btn {
    background: var(--gradient-primary);
    border: none;
    color: white;
    text-shadow: var(--text-shadow);
}

.load-more-btn:hover {
    background: var(--gradient-secondary);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-hard);
}

/* Améliorations des avatars */
.user-avatar,
.friend-avatar,
.notification-avatar,
.comment-avatar {
    border: 3px solid var(--glass-border);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.user-avatar:hover,
.friend-avatar:hover,
.notification-avatar:hover,
.comment-avatar:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--box-shadow-soft);
}

/* Améliorations des images */
.post-image {
    border-radius: var(--radius-lg);
    box-shadow: var(--box-shadow-soft);
    transition: var(--transition);
}

.post-image:hover {
    transform: scale(1.02);
    box-shadow: var(--box-shadow-hard);
}

/* Améliorations des commentaires */
.comment {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
}

.comment:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

/* Améliorations des suggestions d'amis */
.friend-suggestion {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
}

.friend-suggestion:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Améliorations des tendances */
.trending-item {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
}

.trending-item:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

/* Notifications avec effet glassmorphism */
.notification {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
}

.notifications-dropdown {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--box-shadow-soft);
}

/* Animations globales */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Animations d'entrée */
.post,
.friend-suggestion,
.trending-item,
.notification-item {
    animation: fadeInUp 0.6s ease-out;
}

.left-sidebar {
    animation: fadeInLeft 0.6s ease-out;
}

.right-sidebar {
    animation: fadeInRight 0.6s ease-out;
}

/* Effets de hover globaux */
.post,
.friend-suggestion,
.trending-item,
.comment {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Scrollbar personnalisée */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-secondary);
}

/* Améliorations responsive */
@media (max-width: 768px) {
    .social-header {
        backdrop-filter: blur(15px);
    }
    
    .left-sidebar,
    .right-sidebar,
    .main-content {
        backdrop-filter: blur(15px);
    }
    
    .post-form,
    .post {
        backdrop-filter: blur(15px);
    }
}

/* Mode sombre avec glassmorphism */
@media (prefers-color-scheme: dark) {
    :root {
        --glass-bg: rgba(36, 37, 38, 0.8);
        --glass-border: rgba(255, 255, 255, 0.1);
    }
    
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    body::before {
        background: 
            radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.2) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.2) 0%, transparent 50%),
            radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.1) 0%, transparent 50%);
    }
}

/* Effets de particules pour les interactions */
.post-action.like-btn.liked::after {
    content: '❤️';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 20px;
    animation: floatUp 1s ease-out forwards;
    pointer-events: none;
}

@keyframes floatUp {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-30px) scale(1.5);
    }
}

/* Améliorations des transitions */
* {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Focus states améliorés */
input:focus,
textarea:focus,
button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(24, 119, 242, 0.2);
}

/* Améliorations des états de chargement */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}