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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
}

/* Landing Page Styles */
.landing-container {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url('/uploads/wallpapers/default.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.landing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

.landing-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 500px;
    padding: 40px;
    text-align: center;
    color: white;
}

.logo-section {
    margin-bottom: 40px;
}

.logo-section h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.logo-section p {
    font-size: 1.2em;
    opacity: 0.9;
}

.exam-code-section {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.exam-code-section h2 {
    margin-bottom: 20px;
    font-size: 1.5em;
}

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

.input-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 1.1em;
    color: #333;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.3);
}

.btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.error-message {
    color: #ff6b6b;
    margin-top: 10px;
    font-size: 0.9em;
    display: none;
}

.error-message.show {
    display: block;
}

.divider {
    margin: 30px 0;
    position: relative;
    text-align: center;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
}

.divider span {
    background: rgba(0, 0, 0, 0.5);
    padding: 0 15px;
    position: relative;
    z-index: 1;
}

.social-login {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.btn-social {
    padding: 12px 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-social:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.btn-social.google {
    border-color: #4285f4;
}

.btn-social.facebook {
    border-color: #1877f2;
}

.performance-link {
    margin-top: 30px;
}

.performance-link a {
    color: white;
    text-decoration: none;
    font-size: 1.1em;
    padding: 12px 30px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    display: inline-block;
    transition: all 0.3s;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.performance-link a:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

/* Responsive */
@media (max-width: 768px) {
    .landing-content {
        padding: 20px;
    }
    
    .logo-section h1 {
        font-size: 2em;
    }
    
    .exam-code-section {
        padding: 20px;
    }
}