/* Modern Dark Theme Variables */
:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    background-image:
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Glassmorphism Card */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    padding: 2rem;
}

/* Navbar Customization */
.navbar {
    background: rgba(15, 23, 42, 0.8) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-weight: 700;
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--text-muted) !important;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-main) !important;
}

/* Buttons */
.btn-primary {
    background: var(--gradient-primary);
    border: none;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Forms */
.form-control {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem;
    border-radius: 8px;
}

.form-control:focus {
    background: rgba(15, 23, 42, 0.8);
    border-color: var(--primary);
    color: var(--text-main);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.form-label {
    color: var(--text-muted);
    font-weight: 500;
    display: block !important;
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    padding: 2rem 0;
}

/* Utilities */
.text-gradient {
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

a:hover {
    color: var(--primary-hover);
}

/* Alerts */
.alert {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.alert-success {
    border-left: 4px solid #22c55e;
}

.alert-danger {
    border-left: 4px solid #ef4444;
}

.alert-warning {
    border-left: 4px solid #eab308;
}

.btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}