/* assets/css/main.css */
:root {
    --primary: #2979FF;
    --primary-dark: #1565C0;
    --accent: #00E5FF;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-blur: 15px;
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --text-main: #333;
    --text-light: #666;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --radius-lg: 16px;
    --radius-md: 12px;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-attachment: fixed;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { margin: 0; padding: 0; list-style: none; }

/* Utility Classes */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.grid { display: grid; gap: 20px; }
.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Glassmorphism */
.glass-panel {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: rgba(255, 255, 255, 0.6);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    background: rgba(255, 255, 255, 0.8);
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    margin-bottom: 20px;
}

.navbar {
    padding: 15px 0;
    background: rgba(255, 255, 255, 0.85);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.3);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.nav-links { display: flex; gap: 20px; }
.nav-links a { font-weight: 500; font-size: 15px; }
.nav-links a:hover { color: var(--primary); }
.nav-links a.active { color: var(--primary); font-weight: 600; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(41, 121, 255, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(41, 121, 255, 0.4);
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: #fff;
    padding: 40px 0;
    margin-top: 50px;
    border-top: 1px solid #eee;
    text-align: center;
    color: #666;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
    .nav-links { display: none; } /* Add toggle later */
    .mobile-menu-btn { display: block; }
}