/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 50px;
    width: auto;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover, nav a.active {
    background-color: rgba(255,255,255,0.2);
}

.btn-login {
    background-color: #ff6b6b;
    color: white !important;
    padding: 10px 20px !important;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-login:hover {
    background-color: #ff5252;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(30, 60, 114, 0.8), rgba(42, 82, 152, 0.8)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background-color: #ff6b6b;
    color: white;
    border: 2px solid #ff6b6b;
}

.btn-primary:hover {
    background-color: #ff5252;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: white;
    color: #1e3c72;
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 80px 0;
    background-color: white;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #1e3c72;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 30px 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    background: white;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 3rem;
    color: #2a5298;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #1e3c72;
}

/* News Section */
.news {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.news h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #1e3c72;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.news-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.news-card:hover {
    transform: translateY(-5px);
}

.news-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content {
    padding: 20px;
}

.news-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #1e3c72;
}

.news-content .date {
    color: #666;
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: #1e3c72;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.footer-section p, .footer-section li {
    margin-bottom: 10px;
}

.footer-section i {
    margin-right: 10px;
    color: #ff6b6b;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: #ff6b6b;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    transition: all 0.3s;
}

.social-links a:hover {
    background: #ff6b6b;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Role Selection Page */
.role-selection {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.role-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.role-container h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 50px;
}

.role-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.role-card {
    background: white;
    padding: 40px 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: all 0.3s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.role-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.role-card i {
    font-size: 4rem;
    margin-bottom: 20px;
}

.role-card.student i { color: #4CAF50; }
.role-card.teacher i { color: #2196F3; }
.role-card.admin i { color: #FF9800; }

.role-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* Login Form */
.login-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.login-container {
    max-width: 400px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.login-btn:hover {
    background: #5a6fd8;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #667eea;
    text-decoration: none;
}

/* Dashboard Styles */
.dashboard {
    min-height: 100vh;
    background: #f5f7fa;
}

.dashboard-header {
    background: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.dashboard-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.dashboard-content {
    padding: 20px 0;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
}

.sidebar {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    height: fit-content;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 10px;
}

.sidebar-menu a {
    display: block;
    padding: 12px 15px;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    background: #667eea;
    color: white;
}

.main-content {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: 2;
    }
    
    .main-content {
        order: 1;
    }
}