:root {
    /* Colors - Dark Mode Default */
    --bg-body: #09090b;
    --bg-card: #18181b;
    --bg-card-hover: #27272a;
    --bg-secondary: #27272a;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-color: #3f3f46;
    --border-hover: #52525b;
    
    --accent-primary: #06b6d4;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 64px;
    
    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.15);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
p { color: var(--text-secondary); margin-bottom: var(--spacing-md); }

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--text-muted);
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
    overflow: hidden; /* Prevent overflow */
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-primary);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
}
.nav-link:hover { color: var(--text-primary); }

/* Hero */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1000px;
    height: 600px;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.15), transparent 70%);
    z-index: -1;
    pointer-events: none;
}

/* Dashboard Layout */
.dashboard-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.sidebar-nav {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all 0.2s;
}

.sidebar-link:hover, .sidebar-link.active {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.main-content {
    padding: var(--spacing-xl);
    overflow-y: auto;
}

/* Placeholders */
.placeholder-icon {
    width: 24px;
    height: 24px;
    background: var(--text-muted);
    border-radius: 4px;
    display: inline-block;
}
.placeholder-avatar {
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}
.placeholder-chart {
    width: 100%;
    height: 200px;
    background: linear-gradient(180deg, rgba(6, 182, 212, 0.1) 0%, rgba(6, 182, 212, 0) 100%);
    border-bottom: 2px solid var(--accent-primary);
    margin-top: var(--spacing-md);
    border-radius: 4px;
    position: relative;
}

/* Forms */
.form-group { margin-bottom: var(--spacing-md); }
.form-label { display: block; margin-bottom: 8px; color: var(--text-secondary); font-size: 0.875rem; }
.form-input {
    width: 100%;
    padding: 10px 16px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
}
.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

/* Responsive */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(1, 1fr); }
    .dashboard-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; } /* Hide sidebar on mobile for wireframe simplicity */
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .grid-2 { grid-template-columns: 1fr; }
    .hero { padding: 80px 0; }
}