:root {
    /* Colors - Dark Mode Theme */
    --bg-body: #09090b;
    --bg-card: #18181b;
    --bg-card-hover: #27272a;
    --bg-sidebar: #0f0f11;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #52525b;
    
    --border-color: #27272a;
    
    /* Brand Colors - Romantic/Modern */
    --primary: #f43f5e; /* Rose 500 */
    --primary-hover: #e11d48;
    --primary-glow: rgba(244, 63, 94, 0.4);
    
    --accent: #8b5cf6; /* Violet 500 */
    --accent-glow: rgba(139, 92, 246, 0.4);
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    
    /* Layout */
    --sidebar-width: 260px;
    --header-height: 70px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px -5px var(--primary-glow);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

/* Layout Structure */
.app-container {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    z-index: 50;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: var(--space-lg);
    width: calc(100% - var(--sidebar-width));
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    height: var(--header-height);
}

/* Sidebar Components */
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav-item {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    transition: all 0.2s ease;
    cursor: pointer;
}

.nav-item:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: linear-gradient(90deg, rgba(244, 63, 94, 0.1) 0%, rgba(244, 63, 94, 0) 100%);
    color: var(--primary);
    border-left: 3px solid var(--primary);
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
}

.card:hover {
    border-color: #3f3f46;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.stat-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    position: relative;
    overflow: hidden;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-trend {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }

/* Charts Area */
.chart-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.chart-container {
    height: 300px;
    display: flex;
    align-items: flex-end;
    gap: var(--space-md);
    padding-top: var(--space-xl);
}

.bar {
    flex: 1;
    background: var(--bg-card-hover);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    position: relative;
    transition: height 0.5s ease;
    min-height: 4px;
}

.bar-fill {
    background: linear-gradient(to top, var(--primary), var(--accent));
    width: 100%;
    position: absolute;
    bottom: 0;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height 0.3s ease;
}

.bar:hover .bar-fill {
    filter: brightness(1.2);
}

/* Tables */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: var(--space-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
}

.table td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background-color: var(--bg-card-hover);
}

/* Avatars */
.avatar-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: var(--bg-card-hover);
    border: 2px solid var(--bg-card);
    overflow: hidden;
    position: relative;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-secondary);
    background: linear-gradient(135deg, #27272a 0%, #3f3f46 100%);
}

/* Badges */
.badge {
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background: rgba(16, 185, 129, 0.2); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.2); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.2); color: var(--danger); }
.badge-neutral { background: rgba(161, 161, 170, 0.2); color: var(--text-secondary); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(244, 63, 94, 0.4);
}

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

.btn-secondary:hover {
    background: #3f3f46;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
}

/* Search Bar */
.search-wrapper {
    position: relative;
    max-width: 400px;
    width: 100%;
}

.search-input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 10px 16px 10px 40px;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(244, 63, 94, 0.2);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

/* User Profile Preview (Modal-ish) */
.user-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
}

.profile-img-lg {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-full);
    background: var(--bg-card-hover);
    border: 3px solid var(--primary);
    margin-bottom: var(--space-xs);
}

/* Utilities */
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mt-auto { margin-top: auto; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.text-muted { color: var(--text-muted); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }

.display-block { display: block; }

.border-top { border-top: 1px solid var(--border-color); }
.pt-md { padding-top: var(--space-md); }

/* Icons (CSS Shapes) */
.icon {
    width: 20px;
    height: 20px;
    display: inline-block;
    background-color: currentColor;
    mask-size: contain;
    -webkit-mask-size: contain;
    mask-repeat: no-repeat;
    -webkit-mask-repeat: no-repeat;
    mask-position: center;
    -webkit-mask-position: center;
}

/* Simple CSS Icons using masks would be ideal, but for now we'll use placeholder spans or SVGs if strictly needed. 
   Since no external assets allowed without uploading, I will use text characters or simple CSS shapes for icons in HTML */