:root {
    --primary-color: #4e73df;
    --secondary-color: #6c757d;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --light-color: #f8f9fc;
    --dark-color: #5a5c69;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --border-radius: 0.35rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 1rem;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
}

/* Navigation */
.navbar {
    background: var(--gradient-primary);
    padding: 1rem 0;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-size: 1.8rem;
    font-weight: 700;
}

.nav-link {
    font-weight: 500;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 76px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/pattern.png');
    opacity: 0.1;
}

.hero-image {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Sections */
.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Cards */
.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    height: 100%;
    box-shadow: var(--shadow);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
}

.subject-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    height: 100%;
}

.subject-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.subject-img {
    height: 200px;
    overflow: hidden;
}

.subject-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.subject-card:hover .subject-img img {
    transform: scale(1.1);
}

.subject-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1.5rem;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-outline-light:hover {
    transform: translateY(-2px);
}

/* Forms */
.form-container {
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    max-width: 500px;
    margin: 2rem auto;
}

.form-control {
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(78, 115, 223, 0.25);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

/* Dashboard Cards */
.dashboard-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stats-card {
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.stats-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Tables */
.table {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table th {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
}

/* Modal */
.modal-content {
    border-radius: var(--border-radius-lg);
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .form-container {
        padding: 1.5rem;
    }
    
    .navbar-nav {
        text-align: center;
        padding-top: 1rem;
    }
    
    .nav-item.ms-2 {
        margin-left: 0 !important;
        margin-top: 0.5rem;
    }
}

@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .feature-card, .subject-card {
        padding: 1.5rem;
    }
}