:root {
    /* Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    
    /* Backgrounds */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-hover: #334155;
    
    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    
    /* Border */
    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Sizes */
    --navbar-height: 64px;
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 70px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Light theme (optional override) */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-hover: #f3f4f6;

    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;

    --border-color: #e5e7eb;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Roboto', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* Top Navbar */
.top-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    height: 100%;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.sidebar-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    transition: var(--transition);
}

.brand-logo i {
    font-size: 24px;
    color: var(--primary);
}

.brand-logo:hover {
    opacity: 0.8;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.breadcrumbs i {
    font-size: 12px;
}

.current-service {
    color: var(--text-primary);
    font-weight: 500;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle,
.notifications-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.theme-toggle:hover,
.notifications-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.notifications-btn .badge {
    position: absolute;
    top: 6px;
    right: 6px;
    background: var(--danger);
    color: white;
    font-size: 10px;
    padding: 2px 5px;
    border-radius: 10px;
    font-weight: 600;
}

.notifications-btn .badge.is-zero {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
    font-size: 14px;
}

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

.user-btn i.fa-user-circle {
    font-size: 24px;
}

.user-btn i.fa-chevron-down {
    font-size: 12px;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--navbar-height));
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
    z-index: 900;
    overflow-y: auto;
}

.sidebar.collapsed {
    width: var(--sidebar-width-collapsed);
}

.sidebar.collapsed .category-name,
.sidebar.collapsed .service-name,
.sidebar.collapsed .sidebar-footer span,
.sidebar.collapsed .badge-beta {
    display: none;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 20px 0 14px;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.nav-category {
    margin-bottom: 22px;
}

.nav-category-utility {
    margin-bottom: 0;
}

.sidebar-bottom-nav {
    margin-top: auto;
    padding: 14px 0 0;
    border-top: 1px solid rgba(148, 163, 184, 0.12);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 24px 10px;
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.category-services {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.service-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    border-radius: 0;
    border: 0;
}

.service-link .service-name {
    min-width: 0;
    flex: 1;
}

.service-link:hover {
    background: rgba(59, 130, 246, 0.07);
    color: var(--text-primary);
}

.service-link.active {
    background: rgba(59, 130, 246, 0.12);
    color: #93c5fd;
}

.service-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 3px;
    border-radius: 0 999px 999px 0;
    background: var(--primary);
}

.service-link i {
    width: 18px;
    font-size: 16px;
    text-align: center;
}

.badge-beta {
    margin-left: auto;
    padding: 2px 8px;
    background: var(--warning);
    color: white;
    font-size: 10px;
    border-radius: 12px;
    font-weight: 600;
}

.service-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 10px;
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.service-badge-danger {
    background: rgba(239, 68, 68, 0.14);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.28);
}

.sidebar-footer {
    margin-top: 12px;
    padding: 14px 24px 0;
    border-top: 1px solid rgba(148, 163, 184, 0.12);
}

.add-service-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    width: 100%;
    margin-bottom: 12px;
}

.add-service-btn:hover {
    background: var(--primary);
    color: white;
}

.sidebar-info {
    color: var(--text-tertiary);
    font-size: 12px;
    padding-top: 2px;
}

/* Main Content */
.main-wrapper {
    margin-left: var(--sidebar-width);
    margin-top: var(--navbar-height);
    min-height: calc(100vh - var(--navbar-height));
    transition: var(--transition);
}

.sidebar.collapsed ~ .main-wrapper {
    margin-left: var(--sidebar-width-collapsed);
}

.main-content {
    padding: 32px;
    max-width: 1400px;
    margin: 0 auto;
}

/* Sidebar overlay для мобильных */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 850;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-overlay.active {
        display: block;
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .brand-name {
        display: none;
    }
    
    .breadcrumbs {
        display: none;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 0 16px;
    }
    
    .user-btn span {
        display: none;
    }
    
    .main-content {
        padding: 24px 16px;
    }
}

/* Scrollbar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}