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

:root {
    /* Palette bleu marine profond inspirée de l'UI moderne */
    --bg-primary: #0a0e27;
    --bg-secondary: #0f1535;
    --bg-card: #151d3b;
    --bg-hover: #1a2447;
    --text-primary: #e8eaed;
    --text-secondary: #9ca3af;
    --accent-purple: #2563eb;
    --accent-pink: #ec4899;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-orange: #f59e0b;
    --border-color: #1e2a54;
    --gradient: linear-gradient(135deg, #1e40af 0%, #2563eb 100%);
    --gradient-instagram: linear-gradient(45deg, #f59e0b 0%, #f97316 25%, #ec4899 50%, #a855f7 75%, #6366f1 100%);
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Login Section */
.section {
    display: none;
}

.section.active {
    display: block;
}

#login-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-card {
    background: var(--bg-card);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    text-align: center;
    max-width: 450px;
    width: 100%;
    border: 1px solid var(--border-color);
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    background: var(--gradient-instagram);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
}

.login-card h1 {
    font-size: 32px;
    margin-bottom: 10px;
    background: var(--gradient-instagram);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 16px;
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

.input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.input-group input {
    width: 100%;
    padding: 15px 15px 15px 45px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 15px;
    background: var(--gradient-instagram);
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(236, 72, 153, 0.3);
}

.demo-note {
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.demo-note i {
    color: var(--accent-blue);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: var(--bg-card);
    border-radius: 15px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-left i {
    font-size: 32px;
    background: var(--gradient-instagram);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-left h2 {
    font-size: 24px;
}

.mode-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.9;
        transform: scale(1.05);
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.username {
    color: var(--text-secondary);
    padding: 8px 15px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.btn-refresh, .btn-logout, .btn-export {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-export {
    background: var(--accent-green);
    color: white;
}

.btn-export:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-refresh {
    background: var(--accent-purple);
    color: white;
}

.btn-refresh:hover {
    background: #7c3aed;
    transform: translateY(-2px);
}

.btn-logout {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-logout:hover {
    background: var(--bg-hover);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.followers {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-icon.following {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stat-icon.new-followers {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.stat-icon.unfollowers {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.stat-info h3 {
    font-size: 32px;
    margin-bottom: 5px;
}

.stat-info p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;
}

.tab-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-purple);
    color: white;
    border-color: var(--accent-purple);
}

.tab-btn i {
    margin-right: 8px;
}

/* Content Area */
.content-area {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    min-height: 500px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    margin-bottom: 20px;
    font-size: 24px;
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: 20px;
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 14px;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-purple);
}

/* User List */
.user-list {
    display: grid;
    gap: 15px;
}

.user-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.user-item:hover {
    background: var(--bg-hover);
    transform: translateX(5px);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
}

.user-details h4 {
    font-size: 16px;
    margin-bottom: 3px;
}

.user-details p {
    color: var(--text-secondary);
    font-size: 13px;
}

.user-actions {
    display: flex;
    gap: 10px;
}

.btn-action {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s ease;
}

.btn-follow {
    background: var(--accent-blue);
    color: white;
}

.btn-follow:hover {
    background: #2563eb;
}

.btn-unfollow {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-unfollow:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: white;
}

.btn-view {
    background: var(--bg-card);
    color: var(--accent-purple);
    border: 1px solid var(--accent-purple);
}

.btn-view:hover {
    background: var(--accent-purple);
    color: white;
}

/* Engagement Stats */
.engagement-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.engagement-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.engagement-card i {
    font-size: 32px;
    color: var(--accent-purple);
    margin-bottom: 15px;
}

.engagement-card h4 {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
    font-weight: 500;
}

.engagement-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--accent-purple);
}

.chart-container {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

/* Loading */
.loading {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 1000;
}

.loading.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-card);
    border-top: 4px solid var(--accent-purple);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading p {
    margin-top: 20px;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
    }
    
    .header-right {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
    }
    
    .login-card {
        padding: 30px;
    }
}

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

.user-item {
    animation: fadeIn 0.3s ease;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #2563eb 0%, #1e40af 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #3b82f6 0%, #2563eb 100%);
}

/* Menu Export */
.export-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.95);
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(10px);
}

.export-menu.active {
    display: flex;
}

.export-menu-content {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px;
    max-width: 500px;
    width: 90%;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.3);
}

.export-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.export-header h3 {
    font-size: 24px;
    color: var(--text-primary);
}

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

.close-btn:hover {
    background: var(--accent-red);
    color: white;
}

.export-options {
    display: grid;
    gap: 15px;
}

.export-option {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 16px;
    font-weight: 500;
}

.export-option:hover {
    background: var(--bg-hover);
    border-color: var(--accent-purple);
    transform: translateX(5px);
}

.export-option i {
    font-size: 24px;
    color: var(--accent-purple);
}