/* core.css - Modernized with better animations & dark mode */
:root {
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #2d3748;
    --muted: #718096;
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --sidebar: #1e293b;
    --sidebar-hover: #334155;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --gradient-start: #6366f1;
    --gradient-end: #a855f7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 15px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
    
    /* Layout variables */
    --sidebar-width: 300px;
    --header-height: 70px;
}

body.dark {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --sidebar: #0f172a;
    --sidebar-hover: #1e293b;
    --border: #334155;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --info: #60a5fa;
}

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

html {
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.4s ease, color 0.4s ease;
    min-height: 100vh;
    overflow-x: hidden;
}

@media (max-width: 480px) {
    body {
        font-size: 15px;
        line-height: 1.55;
    }
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Smooth animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(25px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

.fade-in-up {
    animation: fadeInUp 0.7s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--muted);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}