:root {
    --bg-color: #0f172a;
    --sidebar-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --primary-color: #6366f1;
    --primary-hover: #818cf8;
    --secondary-color: #1e293b;
    --accent-color: #06b6d4;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --sidebar-width: 240px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --glass-blur: 16px;
    --transition-speed: 0.2s;
    --radius-lg: 12px;
    --radius-md: 8px;
    --radius-sm: 4px;
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --timeline-offset: 44px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.dark-theme {
    background: radial-gradient(circle at top right, #1e1b4b, #0f172a);
}

h3 {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

.btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-speed);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #4f46e5);
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
}

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

.btn-secondary:hover {
    background-color: #334155;
    border-color: var(--primary-color);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-color);
}

.hidden {
    display: none !important;
}

.glass {
    backdrop-filter: blur(var(--glass-blur));
}

*::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

*::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}