:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --info-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
    --danger-gradient: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    --dark-gradient: linear-gradient(135deg, #434343 0%, #000000 100%);
    
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #38ef7d;
    --info-color: #4facfe;
    --warning-color: #fda085;
    --danger-color: #ff6b6b;
    
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --border-color: #e2e8f0;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1), 0 6px 10px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12), 0 10px 20px rgba(0, 0, 0, 0.08);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 14px;
    scroll-behavior: smooth;
    height: 100%;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

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

header {
    flex-shrink: 0;
}

main {
    flex: 1 0 auto;
}

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

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

.navbar {
    background: var(--primary-gradient) !important;
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow-md);
    border: none;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: #fff !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-nav .nav-link:hover {
    color: #fff !important;
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.navbar-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: #fff !important;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

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

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    margin-top: 0.5rem;
    animation: dropdownFade 0.2s ease;
}

@keyframes dropdownFade {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--bg-light);
}

.dropdown-item i {
    width: 1.25rem;
    margin-right: 0.5rem;
}

.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    background: var(--bg-card);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-header.bg-primary {
    background: var(--primary-gradient) !important;
    color: #fff;
    border: none;
}

.card-header.bg-success {
    background: var(--success-gradient) !important;
    color: #fff;
    border: none;
}

.card-header.bg-info {
    background: var(--info-gradient) !important;
    color: #fff;
    border: none;
}

.card-header.bg-warning {
    background: var(--warning-gradient) !important;
    color: #fff;
    border: none;
}

.card-header.bg-danger {
    background: var(--danger-gradient) !important;
    color: #fff;
    border: none;
}

.card-body {
    padding: 1.25rem;
}

.card-footer {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
}

.btn {
    border-radius: var(--radius-md);
    padding: 0.5rem 1.25rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
    background: var(--primary-gradient);
}

.btn-success {
    background: var(--success-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(56, 239, 125, 0.4);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 239, 125, 0.5);
    background: var(--success-gradient);
}

.btn-info {
    background: var(--info-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(79, 172, 254, 0.4);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 172, 254, 0.5);
    background: var(--info-gradient);
}

.btn-danger {
    background: var(--danger-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.5);
    background: var(--danger-gradient);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
}

.btn-outline-secondary {
    border: 2px solid var(--text-secondary);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--text-secondary);
    color: #fff;
    border-color: var(--text-secondary);
}

.btn-outline-success {
    border: 2px solid var(--success-color);
    color: var(--success-color);
    background: transparent;
}

.btn-outline-success:hover {
    background: var(--success-gradient);
    color: #fff;
    border-color: transparent;
}

.btn-lg {
    padding: 0.75rem 1.75rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.35rem 0.85rem;
    font-size: 0.875rem;
}

.form-control, .form-select {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.65rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--bg-card);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
    outline: none;
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-label i {
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 1rem;
}

.list-group {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.list-group-item {
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    transition: all var(--transition-fast);
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item-action:hover {
    background: var(--bg-light);
    transform: translateX(4px);
}

.list-group-item-warning {
    background: linear-gradient(135deg, rgba(253, 160, 133, 0.15) 0%, rgba(246, 211, 101, 0.15) 100%);
    border-left: 4px solid var(--warning-color);
}

.badge {
    padding: 0.4em 0.8em;
    font-weight: 500;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.badge.bg-danger {
    background: var(--danger-gradient) !important;
}

.badge.bg-success {
    background: var(--success-gradient) !important;
}

.badge.bg-info {
    background: var(--info-gradient) !important;
}

.badge.bg-warning {
    background: var(--warning-gradient) !important;
    color: #fff !important;
}

.badge.bg-light {
    background: var(--bg-light) !important;
    color: var(--text-primary) !important;
}

.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-sm);
}

.alert-info {
    background: linear-gradient(135deg, rgba(79, 172, 254, 0.15) 0%, rgba(0, 242, 254, 0.15) 100%);
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

.alert-success {
    background: linear-gradient(135deg, rgba(17, 153, 142, 0.15) 0%, rgba(56, 239, 125, 0.15) 100%);
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.15) 0%, rgba(238, 90, 36, 0.15) 100%);
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-primary {
    color: var(--primary-color) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

footer.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-top: auto;
    flex-shrink: 0;
}

footer.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer.footer a {
    color: var(--primary-color);
    font-weight: 500;
}

.hero-section {
    background: var(--primary-gradient);
    color: #fff;
    padding: 4rem 2rem;
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-section h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-card i {
    font-size: 3rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.message-item {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.message-item:hover {
    background: var(--bg-light);
}

.message-item.unread {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-left: 4px solid var(--primary-color);
}

.message-item:last-child {
    border-bottom: none;
}

.message-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.message-preview {
    color: var(--text-secondary);
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sidebar-card {
    position: relative;
}

.sidebar-menu {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.sidebar-menu .list-group-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    color: var(--text-primary);
    font-weight: 500;
}

.sidebar-menu .list-group-item i {
    width: 1.25rem;
    text-align: center;
    color: var(--primary-color);
}

.sidebar-menu .list-group-item:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary-color);
}

.sidebar-menu .list-group-item.active {
    background: var(--primary-gradient);
    color: #fff;
}

.sidebar-menu .list-group-item.active i {
    color: #fff;
}

.auth-container {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 0;
}

.auth-card {
    max-width: 450px;
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.auth-card .card-header {
    padding: 2rem;
    text-align: center;
}

.auth-card .card-header h3 {
    margin: 0;
    font-weight: 700;
}

.auth-card .card-body {
    padding: 2rem;
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    padding: 0 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.api-section {
    margin-bottom: 2rem;
}

.api-section h3 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.api-card {
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
}

.api-card .card-header {
    padding: 0.85rem 1.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
}

.api-card .card-header h5 {
    margin: 0;
    font-weight: 600;
}

pre {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    /*color: #e2e8f0;*/
    color: #272829;
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.6;
}

pre code {
    color: inherit;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

.error-page {
    text-align: center;
    padding: 4rem 2rem;
}

.error-page h1 {
    font-size: 6rem;
    font-weight: 700;
    background: var(--danger-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.error-page h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state i {
    font-size: 5rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state h5 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-muted);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
}

.user-avatar-lg {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
}

.message-content {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #fff;
}

.stat-icon.primary {
    background: var(--primary-gradient);
}

.stat-icon.success {
    background: var(--success-gradient);
}

.stat-icon.info {
    background: var(--info-gradient);
}

.stat-icon.warning {
    background: var(--warning-gradient);
}

.stat-info h5 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.nav-area-part-bar {
    width:100%;
    min-height: 30px;
}

footer.footer.text-muted {
    position: static;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in {
    animation: slideIn 0.4s ease forwards;
}

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

.pulse {
    animation: pulse 2s infinite;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 1rem;
        border-radius: var(--radius-lg);
    }
    
    .hero-section h1 {
        font-size: 1.75rem;
    }
    
    .card {
        border-radius: var(--radius-md);
    }
    
    .auth-card {
        margin: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
    }
    
    .sidebar-card {
        position: relative;
        top: 0;
        margin-bottom: 1rem;
    }
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

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

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

::selection {
    background: var(--primary-color);
    color: #fff;
}