:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #6b7280;
    --success: #10b981;
    --info: #06b6d4;
    --warning: #f59e0b;
    --danger: #ef4444;
    --light: #f8fafc;
    --dark: #1f2937;
    --gradient-start: #6366f1;
    --gradient-end: #8b5cf6;
    --accent: #ec4899;
    --surface: #ffffff;
    --border: #e5e7eb;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0e7ff 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

/* Navigation Styles */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
}

.navbar-brand i {
    margin-right: 10px;
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    color: var(--dark) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white !important;
    transform: translateY(-2px);
}

/* Card Styles */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    margin-bottom: 2rem;
    overflow: hidden;
    background: var(--surface);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--dark);
}

.card-body {
    padding: 2rem;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--gradient-start));
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669, var(--success));
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.4);
}

.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Form Styles */
.form-control {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    border: 2px solid var(--border);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--surface);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(99, 102, 241, 0.15);
    transform: translateY(-2px);
}

/* Alert Styles */
.alert {
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* Footer Styles */
.footer {
    background: var(--surface);
    padding: 3rem 0;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--border);
}

/* Responsive Design */
@media (max-width: 768px) {
    .card-body {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.875rem 1.25rem;
    }
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

/* Loading Spinner */
.loading-shimmer {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Utility Classes */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 15px;
}