/* Layout System & Design Tokens */
:root {
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 72px;
    --header-height: 70px;
    --bg-dark: #09090b;
    --surface-dark: #121214;
    --surface-raised-dark: #1a1a1e;
    --border-dark: rgba(255, 255, 255, 0.08);
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --accent-color: #fbbf24; /* Warm Amber */
    --accent-gradient: linear-gradient(135deg, #fbbf24, #d97706);
    --success-color: #10b981;
    --error-color: #ef4444;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-premium: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base resets & layout container */
body.layout-body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
}

/* Sidebar Styling */
.app-sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background-color: var(--surface-dark);
    border-right: 1px solid var(--border-dark);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition-smooth);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.4);
}

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

/* Sidebar Brand */
.sidebar-brand {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-dark);
    gap: 12px;
    overflow: hidden;
}

.sidebar-brand-icon {
    width: 28px;
    height: 28px;
    background: var(--accent-gradient);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: #000;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.sidebar-brand-name {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.2s;
}

.app-sidebar.collapsed .sidebar-brand-name {
    opacity: 0;
    pointer-events: none;
}

/* Navigation Links */
.sidebar-nav {
    flex: 1;
    padding: 24px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    overflow-y: auto;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    gap: 16px;
    transition: var(--transition-smooth);
    white-space: nowrap;
    position: relative;
    border: 1px solid transparent;
}

.nav-item-icon {
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    flex-shrink: 0;
}

.nav-item-label {
    opacity: 1;
    transition: opacity 0.2s;
}

.app-sidebar.collapsed .nav-item-label {
    opacity: 0;
    pointer-events: none;
}

.nav-item:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.04);
}

.nav-item.active {
    color: #000;
    background: var(--accent-gradient);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.25);
}

.nav-item.active .nav-item-icon {
    color: #000;
}

/* Sidebar Footer (User details / Collapse control) */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-dark);
    display: flex;
    flex-direction: column;
    gap: 10px;
    background-color: rgba(0, 0, 0, 0.15);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--surface-raised-dark);
    border: 1px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-weight: 700;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

.user-role {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.app-sidebar.collapsed .user-info {
    display: none;
}

/* Collapse Toggle Button */
.sidebar-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-dark);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: var(--transition-smooth);
}

.sidebar-toggle-btn:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Main Content Area */
.app-container {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.app-sidebar.collapsed ~ .app-container {
    margin-left: var(--sidebar-collapsed-width);
}

/* Main Content Header */
.app-header {
    height: var(--header-height);
    background-color: rgba(9, 9, 11, 0.7);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 900;
}

.header-title-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-breadcrumb {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.header-breadcrumb span {
    color: var(--text-primary);
    font-weight: 600;
}

.header-actions-area {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Client Specific top header styles */
.client-header {
    background: rgba(18, 18, 20, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-dark);
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 12px 32px;
    box-sizing: border-box;
}

.client-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.client-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.client-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.client-tabs {
    display: flex;
    gap: 8px;
    min-width: 0;
}

.client-tab-link {
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.client-tab-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.client-tab-link.active {
    color: var(--accent-color);
    background: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.2);
}

/* Client content area */
.client-content {
    max-width: 1400px;
    padding: 32px 28px;
}

/* Page Main Shell */
.app-content {
    flex: 1;
    padding: 40px;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    box-sizing: border-box;
}

/* Premium Card Panels */
.premium-panel {
    background: linear-gradient(145deg, #121214 0%, #0c0c0e 100%);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-premium);
    position: relative;
    overflow: hidden;
}

.premium-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .app-sidebar {
        left: -100%;
    }
    
    .app-sidebar.mobile-open {
        left: 0;
    }
    
    .app-container {
        margin-left: 0 !important;
    }
    
    .app-header {
        padding: 0 16px;
    }
    
    .app-content {
        padding: 20px;
    }
    
    .client-header {
        padding: 10px 16px;
    }
    
    .client-tabs {
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .client-header {
        padding: 8px 12px;
    }
    .client-brand .user-name {
        font-size: 0.85rem !important;
    }
    .client-brand .user-role {
        font-size: 0.6rem !important;
    }
    .client-brand img {
        height: 26px !important;
    }
    .badge-premium {
        padding: 3px 8px;
        font-size: 0.65rem;
    }
    .client-content {
        padding: 20px 12px;
    }
    .app-content {
        padding: 16px 12px;
    }
}

/* Premium UI elements */
.badge-premium {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.badge-premium.success {
    background: rgba(16, 189, 129, 0.12);
    color: var(--success-color);
    border: 1px solid rgba(16, 189, 129, 0.25);
}

.badge-premium.warning {
    background: rgba(251, 191, 36, 0.12);
    color: var(--accent-color);
    border: 1px solid rgba(251, 191, 36, 0.25);
}

.badge-premium.danger {
    background: rgba(239, 68, 68, 0.12);
    color: var(--error-color);
    border: 1px solid rgba(239, 68, 68, 0.25);
}