/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.main {
    width: 100%;
    max-width: 400px;
}

form {
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

form:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

fieldset {
    border: none;
    padding: 40px 30px;
}

legend {
    font-size: 2rem;
    font-weight: 700;
    color: #333;
    text-align: center;
    margin-bottom: 30px;
    padding: 0 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
    font-size: 0.9rem;
}

input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: #f8f9fa;
}

input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

input[type="email"]::placeholder,
input[type="password"]::placeholder {
    color: #a0a4a8;
}

button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

button:active {
    transform: translateY(0);
}

/* Responsive design */
@media (max-width: 480px) {
    body {
        padding: 15px;
    }
    
    fieldset {
        padding: 30px 20px;
    }
    
    legend {
        font-size: 1.7rem;
    }
    
    input[type="email"],
    input[type="password"] {
        padding: 12px;
    }
    
    button {
        padding: 12px;
    }
}

/* Loading state */
button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* Success state animation */
@keyframes success {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

form.success {
    animation: success 0.6s ease;
}