.container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.card {
    max-width: 450px;
    width: 100%;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.logo {
    width: 100px;
    height: 100px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, #0d9488 0%, #14b8a6 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(2.5rem, 6vw, 3rem);
    color: white;
    box-shadow: 0 5px 15px rgba(13, 148, 136, 0.3);
    animation: pulse 2s infinite;
    flex-shrink: 0;
}

h1 {
    font-size: clamp(1.6rem, 4.5vw, 2rem);
    margin-bottom: 10px;
    color: #1f2937;
    font-weight: 700;
    line-height: 1.2;
}

.subtitle {
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    margin-bottom: 40px;
    color: #6b7280;
    line-height: 1.5;
}

.form {
    margin: 30px 0;
}

.form-group {
    margin-bottom: 24px;
}

.form-input {
    font-size: clamp(1.1rem, 3vw, 1.2rem);
    padding: clamp(14px, 3vw, 16px) clamp(18px, 4vw, 20px);
    text-align: center;
    letter-spacing: clamp(2px, 1vw, 4px);
    text-transform: uppercase;
    width: 100%;
}

#submit-btn {
    width: 100%;
    padding: clamp(14px, 3vw, 16px) clamp(24px, 5vw, 32px);
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.footer {
    margin-top: 30px;
}

@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }
    
    h1 {
        font-size: clamp(1.5rem, 4.5vw, 1.75rem);
    }
    
    .logo {
        width: 80px;
        height: 80px;
        font-size: clamp(2.2rem, 6vw, 2.5rem);
        margin-bottom: 20px;
    }
    
    .subtitle {
        font-size: clamp(0.85rem, 2.5vw, 0.9rem);
        margin-bottom: 30px;
    }
    
    .form-input {
        font-size: clamp(1rem, 2.8vw, 1.05rem);
        padding: clamp(12px, 3vw, 14px) clamp(16px, 4vw, 18px);
        letter-spacing: clamp(1.5px, 0.8vw, 3px);
    }
    
    #submit-btn {
        padding: clamp(12px, 3vw, 14px) clamp(20px, 4vw, 24px);
        font-size: clamp(0.95rem, 2.5vw, 1rem);
    }
    
    .card {
        padding: 24px 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: clamp(1.4rem, 4.5vw, 1.5rem);
    }
    
    .logo {
        width: 70px;
        height: 70px;
        font-size: clamp(2rem, 5.5vw, 2.2rem);
    }
    
    .subtitle {
        font-size: clamp(0.8rem, 2.5vw, 0.85rem);
    }
    
    .form-input {
        font-size: clamp(0.9rem, 2.5vw, 0.95rem);
        padding: clamp(10px, 2.5vw, 12px) clamp(14px, 3.5vw, 16px);
        letter-spacing: clamp(1px, 0.5vw, 2px);
    }
    
    #submit-btn {
        padding: clamp(10px, 2.5vw, 12px) clamp(18px, 4vw, 20px);
        font-size: clamp(0.9rem, 2.5vw, 0.95rem);
    }
    
    .card {
        padding: 20px 16px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        padding: 30px 24px;
    }
    
    .logo {
        width: 90px;
        height: 90px;
        font-size: 2.8rem;
    }
}